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JP2001119790

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2001119790
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibrating membrane which is tensioned and vibrated, and a flat speaker capable of vibrating and
driving the vibrating membrane with a slight driving force.
[0002]
2. Description of the Related Art FIG. 15 is a longitudinal sectional view showing an example of a
conventional flat loudspeaker. In the flat speaker 1 shown in the figure, a flat diaphragm 2 is
driven from the back side by a voice coil type exciter (exciter) 3. The vibrator 3 comprises a voice
coil 5 of which one end is bonded to the center of the back surface of the vibrating film 2 via a
piston plate 4 and a columnar magnet 6 coaxially disposed on the other end side of the voice coil
5. Configured The columnar magnet 6 is accommodated in a flanged bottomed cylindrical yoke 7
and is assembled to the peripheral portion of the plate-like back plate 8 holding the buffer sleeve
7a fitted to the cylindrical portion of the yoke 7 The peripheral portion of the vibrating
membrane 2 is fixed to the support frame 9 via a ring-shaped gasket 9a for maintaining the
membrane shape. The voice coil 5 is connected to the ridge of the yoke 7 by a damper 10 whose
one end is connected to the side surface thereof. The conventional exciter 3 causes the piston
plate 4 to move in the front-rear direction by the force of the framing generated in the voice coil
5 when the voice current is supplied to the voice coil 5 in the magnetic field formed by the
columnar magnet 6 to excite the voice current. The vibrating membrane 2 which is driven and
vibrated is adapted to generate a sound pressure.
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[0003]
The above-described conventional flat speaker 1 has the voice coil 5 and the pillars, since the
vibrating membrane driving ability of the vibrator 3 is proportional to the generated magnetic
force of the pillar magnets 6 and the number of coil turns of the voice coil 5. In order to secure
the sound pressure required for practical use without changing the specification of the magnet 6,
the weight of the vibrating membrane 2 could only be reduced. This is because, in order to
transmit the applied vibrational energy efficiently to the atmosphere, it is necessary to statically
displace the vibrating membrane 2 in the back and forth direction while maintaining the plane in
the largest possible area. The weight reduction of the vibrating membrane 2 has been a major
mission for speaker developers. However, a vibrating film suitable for weight reduction generally
means the use of an expensive film material, and the processability decreases as the film material
is more expensive, so in reality, it is necessary to use the vibrating film 2 having a certain weight.
Since the output sound pressure level in that case is about 70 to 80 dB / W, in order to obtain a
sound pressure of 90 dB or more, an amplifier having an output of 10 W or more is required for
the power amplifier serving as a driving source. Thus, the conventional flat speaker 1 can not be
used directly as it is, for example, directly connected to the headphone output terminal of a
portable audio device with an output of several tens of mW, and can be used outdoors on the
premise of battery drive It was a fact that the way was closed.
[0004]
Further, although the conventional flat speaker 1 supports the peripheral portion of the vibrating
membrane 2 on the support frame 9 via the ring-shaped gasket 9a for maintaining the
membrane shape, the gasket 9a itself inhibits the vibration of the vibrating membrane 2 In order
to prevent unnecessary load, only the minimum necessary film shape maintenance force is given,
and from the drive principle, the vibrating membrane 2 is manufactured on the premise that all
sides are free ends. ing. For this reason, when a certain period of use passes, the rigidity
gradually decreases due to moisture absorbed from the outside air, and a part slightly recurves
or curves, so that accurate piston vibration of the diaphragm 2 can not be expected. The
peripheral portion of the vibrating membrane 2 touches the periphery to cause a flicker, or the
deformed portion squeezes the voice coil 5 to hinder the operation of the vibrator 3, or in an
extreme case, the voice coil 5 is a magnetic circuit. There is a problem such as the sliding sound
being generated by coming into contact with the disc, etc., and the reproduced sound gradually
loses its crack and tends to lose its vividness. Further, such warping or sagging occurring in the
vibrating film 2 is different in the gravity and external stress acting on the upper and lower sides
and the left and right sides other than the reason that the environment such as temperature and
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humidity received on the front and back of the vibrating film 2 is different. There is also a cause,
and the conventional flat speaker 1 has problems such as the existence of many factors that
inhibit constant stable reproduction.
[0005]
Furthermore, the conventional flat speaker 1 has a configuration in which the piston plate 4 at
the tip of the vibrator 3 is fixed to the back surface of the vibrating membrane 2 by bonding or
the like, and the assembly time required including bonding time is long. Since the piston plate 4
adheres to the vibrating membrane 2 with a certain bonding area, the vibration of the vibrating
membrane 2 is easily regulated by the piston plate 4, and the damper 10 connecting the voice
coil 5 to the yoke 7 comprises Since strength to endure the weight is required, the flexible
movement of the voice coil 5 is likely to be inhibited, and furthermore, the voice coil 5 has a
certain degree of axial line to absorb the positional deviation when the piston plate 4 is fixed to
the vibrating membrane 2. It is necessary to secure a room for tilting, which makes it impossible
to minimize the magnetic gap between the voice coil 5 and the magnetic circuit surrounding it,
and it is difficult to maximize the magnetic efficiency. They were those facing the challenges of
etc. is. In addition, since the vibrator 3 is fixed to the vibrating membrane 2, even if a plurality of
vibrating membranes 2 having different patterns or designs printed on the surface are provided
as an option, the vibrator 3 is attached. Since the vibrating membrane 2 has to be replaced in the
state, and only the vibrating membrane 2 can not be removed for replacement, there are
problems such as an increase in replacement cost.
[0006]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems,
and it is an object of the present invention to achieve constant stable reproduction and to
improve sound pressure by driving a square diaphragm subjected to tensile tension.
[0007]
In order to achieve the above object, the vibrating membrane of the present invention according
to claim 1 comprises a polygonal vibrating membrane section which is vibrated from the outside
and vibrated, and each of the vibrating membrane section. It is characterized in that it comprises:
a fixed film part which is extended and integrally formed independently to the peripheral side for
each side, and which supports and fixes the vibrating film part in a state of giving a tensile
tension. .
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[0008]
In addition, the vibrating film portion and the fixed film portion may be made of polyethylene
terephthalate or metal-deposited polyethylene terephthalate, or the vibrating film portion and the
fixed film portion may be made of polyethylene naphthalate or metal-deposited polyethylene
naphthalate, Another feature is that the vibrating film portion and the fixed film portion are made
of carbon fiber or the like.
[0009]
The vibrating membrane of the present invention according to claim 6 is formed by forming
rectangular notches at the four corners of a quadrangular film material, and passes through a
line connecting the cut apexes of the respective notches or the vicinity thereof. It is characterized
by comprising a square shaped vibrating membrane section surrounded by a line, and a fixed
membrane section comprising a region obtained by removing the vibrating membrane section
from the molded membrane material.
According to a fourteenth aspect of the present invention, there is provided a vibrating
membrane according to the present invention, which includes: a rectangular longitudinal
membrane in which the fixed membrane portion is connected to the upper and lower sides of the
vibrating membrane portion; And a liquid which is interposed between the vibrating membrane
portions in a state where the vibrating membrane portions of the horizontal membrane and the
longitudinal membrane are superimposed, and which causes the vibrating membrane portions to
unite with each other by surface tension. It is.
[0010]
The flat speaker of the present invention according to claim 5 comprises the vibrating membrane
according to any one of claims 1 to 4, a supporting frame for supporting and fixing the fixed
membrane portion of the vibrating membrane, and the supporting frame supported by the
supporting frame Tensioning means for applying a pulling tension from the central portion to the
periphery with respect to the vibrating membrane portion of the vibrating membrane, and the
supporting frame supported by the support frame on the back surface of the vibrating membrane
portion of the vibrating membrane And a vibrator which vibrates and drives the vibrating
membrane portion in contact therewith.
[0011]
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The flat speaker of the present invention according to claim 7 comprises the vibrating membrane
according to claim 6, a rectangular frame-shaped supporting frame for supporting and fixing the
fixed film portion of the vibrating membrane, and the vibration supported by the supporting
frame. Tensile tension applying means for applying tensile tension to upper and lower sides and
left and right sides separately from the vibrating membrane portion of the membrane
individually in the separating direction, and supported by the support frame, the back surface of
the vibrating membrane portion of the vibrating membrane And a vibrator which vibrates and
drives the diaphragm portion.
According to a fifteenth aspect of the present invention, there is provided a flat loudspeaker
according to the fifteenth aspect of the present invention, comprising: the diaphragm according
to the fourteenth aspect; Tensioning means for applying tension to the vibrating membrane
portion of the longitudinal membrane vertically to the vibrating membrane portion of the
longitudinal membrane with respect to the vibrating membrane supported by the support frame;
The vibrator is characterized in that it is supported by the support frame, and is in contact with a
back surface of the vibrating membrane portion of the vibrating membrane so as to vibrate the
vibrating membrane portion.
[0012]
Still further, in the flat speaker of the present invention according to claim 7 or 15, the tensile
tension biasing means is provided so as to protrude on the inner edge of the support frame and
abuts on the fixed film portion to make the vibrating end A fret for forming a partition, an
engagement groove formed in the support frame, and a clip member engaged with the
engagement groove to lock a part of the fixed film portion of the vibrating membrane in the
engagement groove Or the tensioning and biasing means is projected on the inner edge of the
support frame, and a fret which abuts on the fixed film portion to define the vibrating end, and
the connection of each side of the support frame The adjustment screw which is interposed in
the part and variably adjusts the coupling distance, or the tensile tension biasing means is
projected on the inner edge of the support frame and abuts on the fixed membrane part to
partition the vibrating end The frets to be formed and the fixed film portion of the vibrating film
are heated and formed Contract and is characterized in such that comprising a welding unit for
welding to the support frame.
Alternatively, in the flat speaker of the present invention according to claim 7, the vibrating
membrane according to claim 6 has heat shrinkability only in a specific uniaxial direction, and
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orthogonal two axes oblique to the specific uniaxial direction. The film is formed from a square
film material divided by four parallel sides, and the tensile tension biasing means is provided so
as to protrude on the inner edge of the support frame, and the fixed film portion of the vibrating
film is supported by the support frame. When the vibrating membrane is heated and shrunk in a
fixed state, the vibrating membrane is closely fitted to the fixed membrane portion, and the
vibrating membrane is tightened in the orthogonal two-axis direction, and has a fret for
partitioning and forming a vibrating end. It is.
[0013]
Further, the vibrating membrane is made of a transparent membrane or a semitransparent
membrane through which at least the vibrating membrane portion transmits light, and the
vibrator is disposed near the periphery of the vibrating membrane portion, or the vibrating
membrane is At least the vibrating film portion is made of an opaque film which does not
transmit light, and the vibrator is disposed near the center of the vibrating film portion.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to FIGS.
1 (A) and 1 (B) are a perspective view and an exploded perspective view showing a schematic
configuration of the first embodiment of the flat speaker of the present invention, respectively,
and FIGS. 2 (A), 2 (B) and 2 (C) are respectively 4 is a front view, a longitudinal sectional view
and a rear view of the flat speaker shown in FIG. 1, FIG. 3 is an enlarged sectional view of an
essential part of the flat speaker shown in FIG. 8 (A), (B), and (C) are an exploded perspective
view, a front view, and an enlarged sectional view of an essential part, showing the schematic
configuration of each of the second to sixth embodiments of the flat speaker of the present
invention; 9 (A), (B) and (C) are a front view showing a modification of the flat speaker shown in
FIG. 8, a side view of the main part and a bottom view of the main part, and FIGS. 10 (A) and (B)
FIG. 11 is a front view showing another modification of the flat speaker shown in FIG. 8 and an
explanatory view of a vibrating film cutting method, and FIG. 11 is a plan view of the flat speaker
of the present invention. FIG. 12 is a schematic perspective view showing one application
example of the flat speaker shown in FIG. 11, and FIG. 13 is a flat speaker shown in FIG. 14A and
14B are a front view and a side view showing another embodiment of the vibrating membrane of
the present invention, respectively.
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[0015]
The flat speaker 11 shown in FIGS. 1A and 1B supports the four sides of a square diaphragm 12
called a tensed diaphragm on a support frame 13 having a quadrangular frame shape, and the
back central portion of the diaphragm 12 The configuration is such that the piston 14 is driven
by the vibrator 14 to generate sound.
The vibrating film 12 is formed, for example, by processing a material such as PEN (polyethylene
naphthalate) or PET (polyethylene terephthalate) or metal-vapor-deposited thereon or a carbon
fiber or the like into a square film sized to cover the front surface of the support frame 13 Use
the one. That is, by using a synthetic resin material or synthetic fiber suitable for film processing
and a film material having high tension resistance as the vibrating film 12, stable vibration
characteristics can be maintained over a long period of time, In particular, in the case of using a
film material with high tensile rigidity such as PEN or PET subjected to metal deposition, stable
vibration characteristics with almost no deterioration over time can be constantly maintained. In
addition, in order to give tensile tension from four directions and to use the formed square film,
four corners are notched in a rectangular shape, and when paying attention to the function of
each part, a line connecting cut apexes of the notches or its It can be functionally classified into a
square vibrating film portion 12a having a predetermined aspect ratio surrounded by a line
passing through the vicinity, and a fixed film portion 12b including the remaining region
excluding the vibrating film portion 12a from the formed film material . The fixed film portion 12
b is fixed to the support frame 13, and the vibrating film portion 12 a is supported in a tensed
state.
[0016]
By the way, when it is assumed that the back central portion is driven as a point sound source,
the difference in acoustic characteristics based on the difference in shape between the
rectangular diaphragm 12a and the circular diaphragm (not shown) is obvious. is there. That is,
since the distance from the point sound source to the peripheral edge is different for each
azimuth, the square diaphragm portion 12a has a single shape like a circular diaphragm in which
the distance from the point sound source to the peripheral edge matches in all directions. It does
not exhibit resonance characteristics such as significant resonance at one frequency, and has a
large number of resonance frequencies. Therefore, the rectangular diaphragm 12a has a
sufficiently wide reproduction frequency band as compared with the circular diaphragm, and the
longitudinal tension applied to the upper and lower sides and the lateral direction applied to the
left and right sides. By adjusting the tensile tension of the film independently of each other,
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desired frequency characteristics can be realized freely, and advantages derived from the film
shape can be effectively utilized for the acoustic effect.
[0017]
As shown in FIGS. 2 (B) and 2 (C), the vibrator 14 has a voice coil 15 whose one end is in contact
with the back center of the vibrating membrane 12 via the piston plate 15a, and the voice coil 15
A caldera volcano-shaped yoke 16 having an inverted E-shaped cross section coaxially disposed
on the end side, an annular magnet 17 held in the middle of the annular portion of the yoke 16, a
side surface of the voice coil 15 and an end of the yoke 16 And a damper 18 for connecting the
parts. The exciter 14 is configured to ensure high efficiency by strengthening the magnetic force,
minimizing the magnetic gap, or reducing the friction of the damper, and the voice coil 15 in the
magnetic field formed by the annular magnet 17 along the yoke 16. When a voice current is
supplied, the voice coil 15 vibrates in the axial direction by the force of the framing generated in
the voice coil 15, and the piston plate 15a is driven in the front-rear direction.
[0018]
Further, the piston plate 15 a is not adhered to the vibrating membrane 12, but is merely
brought into contact with the back central portion of the vibrating membrane 12. Therefore, the
vibrator 14 needs to be separately held on the back side of the vibrating membrane 12. For this
reason, in the present embodiment, a back surface portion of the yoke 16 is fixed to an
intersection portion of the pressing rods 19 using a pair of pressing rods 19 intersecting in an X
shape, and an end portion of the pressing rods 19 is a support frame It is fixed to the four
corners of 13. Thus, the vibrator 14 is pressed and held at the center of the back of the vibrating
membrane 12. Note that a skew adjustment mechanism (not shown) for adjusting the swing
angle of the vibrator 14 with respect to the pressure bar 19 is incorporated at the intersection of
the pressure bar 19 so that the axis of the voice coil 15 can be orthogonally adjusted to the
diaphragm 12. is there.
[0019]
The support frame 13 is configured by combining an upper side, a lower side, a left side, and a
right side in a square frame shape. On each side, as shown in FIG. 2 (A) or FIG. 3, a fret 20 having
a semicircular cross section is provided so as to protrude on the inner edge side, and the end
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edge of the diaphragm 12 is fixed on the outer edge side A band-like frill 21 for fixing is fixed.
Furthermore, in the case of the present embodiment, engaging grooves 22 having a U-shaped
cross-section are respectively bored in the longitudinal direction in the central part of the lower
side and the right side of the support frame 13, It is configured to engage with the clip rod 23
having a force to tension the vibrating membrane 12. That is, in the case of the present
embodiment, the fret 20, the engagement groove 22 and the clip bar 23 constitute tension
tension biasing means for applying tension to the vibrating membrane 12 from the central
portion to the peripheral portion. And the height of the engagement groove 22 and the
engagement depth of the clip bar 23 with respect to the engagement groove 22 determine the
tension.
[0020]
At the time of assembling the flat speaker 11, first, corresponding edge portions of the fixed film
portion 12b of the vibrating film 12 are glued and adhered to the band-like frills 21 on the left
side portion and the upper side portion of the support frame 13. Next, the vibrating membrane
12 is pulled flat, and the corresponding end portions of the fixed membrane 12b of the vibrating
membrane 12 are glued and adhered to the band-like frills 21 on the right side and lower side of
the support frame 13. However, in this state, only a slight tension is applied to the vibrating
membrane 12, and it can be said that the vibrating membrane 12 is slightly relaxed rather than a
tension state. Then, the two clip rods 23 are taken out and engaged with the engagement grooves
22 of the right side portion and the lower side portion of the support frame 13 from above the
vibrating membrane 12. As a result, the vibrating membrane 12 which has been stretched so far
is pulled horizontally and vertically according to the amount of pushing of the clip rod 23, and as
shown in FIG. 2A, each has a constant tension. It is put on. In this case, the tension in the left and
right direction and the tension in the vertical direction can be optionally adjusted in accordance
with the amount of depression of the corresponding clip rod 23, and as described above By
independently adjusting, desired frequency characteristics can be realized freely.
[0021]
When the assembly of the vibration film 12 to the support frame 13 is completed in this way, the
end portions of the pair of pressing rods 19 with the exciter 14 fixed at the intersections are
screwed to the four corners on the back side of the support frame 13 Fix it. In that case, the
piston plate 15a at the end of the voice coil 15 of the vibrator 14 abuts on the central portion of
the back surface of the diaphragm 12, but the diaphragm 12 itself is pulled vertically and
horizontally. It is preferable that the vibrating membrane 12 be assembled so as to be in contact
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9
with a pressing force that causes a displacement of about half of the maximum amplitude. In
addition, since the swing angle of the vibrator 14 with respect to the pressing rod 19 can be
freely adjusted by the skew adjustment mechanism, the piston plate 15a is made perpendicular
to the vibration film 12 using an adjustment jig (not shown) or the like. It can be adjusted to
vibrate.
[0022]
In the flat speaker 11 having the above configuration, when a voice current is supplied to the
voice coil 15, a force of Fleming corresponding to the magnitude of the current and the number
of coil turns is generated, and the diaphragm 12 is piston-driven in the front-rear direction by the
piston plate 15a. Generates sound pressure. In this case, since the vibrating membrane 12 itself
is tensioned and tensioned, and vibrates with a slight pressing driving force, sufficient sound
pressure can be generated only by supplying a minute driving current. Therefore, for example, in
the case of the diaphragm 12 having an area of about A4 size, the voice coil 15 can be driven by
being energized as it is without passing the output signal of the headphone output terminal
through the amplifier. According to the experimental results, it is known that the sound pressure
improvement effect by the vibrating film 12 to which the tensile tension is applied exceeds
several dB, and the sound pressure improvement effect by several dB due to the combined use of
the high sensitivity vibrator 14 In addition, the sound pressure can be improved by about 10 dB
in the entire flat speaker 11. Specifically, in the case of a conventional free edge type flat
speaker, tension is applied to the vibrating membrane 12 with an A6 size vibrating membrane
driven through a power amplifier of about 1.2 W output that amplifies the headphone output. It
has been confirmed that the flat speaker 11 driven in a steady state can be driven directly with
the headphone output, and furthermore, the reproduced sound obtained has an equal sound
pressure, frequency characteristic and distortion factor. Also, in the case of a conventional free
edge type flat speaker, the A3 size diaphragm that was driven via a 10 W output power amplifier
that amplifies the headphone output is also driven with tension applied to the diaphragm 12 The
flat speaker 11 can be driven by amplifying the headphone output with a 1 W output power
amplifier capable of battery driving of about 4 AA batteries and can be driven, and capable of
power supply cordless drive without the need for external power supply to the flat speaker Has
been confirmed.
[0023]
As described above, the flat speaker 11 supports the support frame 13 in a state in which tensile
tension is separately applied to the upper and lower sides and the left and right sides of the four
sides of the square diaphragm 12 with four corners cut away. Since the vibrating membrane 12
is driven to vibrate by the vibrator 14 in contact with the back surface of the vibrating membrane
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12, the rectangular vibrating membrane 12 in which the distance from the driving point of the
vibrator 14 to the peripheral portion changes depending on the azimuth. As a characteristic
feature of the present invention, a sufficiently wide reproduction frequency band can be obtained
by the presence of a large number of resonance frequencies, and furthermore, the rectangular
diaphragm 12 applies tensile tension separately to the upper and lower sides and the left and
right sides. Thus, the desired frequency characteristics can be realized, and since the four corners
of the vibrating membrane 12 are notched, the tension in the vertical direction and the tension in
the horizontal direction interfere with each other. And no, it is possible to variably set freely.
[0024]
Further, the piston plate 15a at the tip of the vibrator 14 does not have to be fixed to the back
surface of the vibrating membrane 12, and only needs to be in contact with it. 15a does not
regulate the vibration of the vibrating film 12.
In addition, since the vibrating membrane 12 is supported in a tensile manner in four directions,
the damper 18 connecting the voice coil 15 to the yoke 16 does not require strength, and the
damper 18 does not inhibit the light motion of the voice coil 15. Furthermore, since no positional
deviation occurs when the piston plate 15a is brought into contact with the vibrating film 12,
there is no need to secure an axial inclination room for the voice coil 15, and thereby the voice
coil 5 and the magnetic circuit surrounding it. And the magnetic efficiency between them can be
maximized. Thus, the tension-tensioned vibrating membrane 12 can be a sufficient source of
vibration even though it is lightweight, and can generate a sufficient volume with a small driving
force. For this reason, the flat speaker 11 can be directly driven directly to the headphone output
terminal attached to the audio device or the video device, whereby the speaker for the portable
AV device which does not require a special power amplifier For example, it is possible to perform
full-scale sound reproduction on the travel destination by finishing the speaker with an external
shape of a plastic case that accommodates a CD (compact disc), for example.
[0025]
In addition, since the diaphragm 12 is supported by the support frame 13 in a tensioned state,
the planar shape is lost due to the hygroscopic effect with the progress of use as in the
conventional flat speaker 1 basically having the peripheral portion at the free end. Therefore, the
piston vibration can not be expected and the reproduced sound is not lacking in vividness, highquality reproduction characteristics can be constantly maintained, and furthermore, the vibrator
14 for driving the diaphragm 12 is at the driving point. Since only the diaphragm 12 is in contact
with the diaphragm 12, if a plurality of diaphragms 12 different in printed pattern or design or
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the diaphragm 12 to which a photograph is freely attached is prepared, these diaphragms 12
may be prepared. The user can select a preferred one from among the above, and the vibrator 14
can replace only the vibrating film 12 as it is, taking into consideration the use as a photo frame
and interior decoration, and reducing the replacement cost. It is possible to provide an easy-touse of the end-user-oriented.
[0026]
In the first embodiment, although the tension is applied to the vibrating membrane 12 by the clip
rod 23 engaged with the right side and the lower side of the support frame 13, FIGS. 4A to 4C
are used. Like the flat speaker 31 shown, the four sides of the vibrating film 32 can be fixed to
the support frame 33 using the clip frame 34 integrated in a rectangular shape.
In the case of the second embodiment, a fret 35 is provided in a rectangular frame shape so as to
protrude on the inner edge side of the support frame 33. The height of the fret 35 and the clip
frame 34 with respect to the annular engagement groove 36 of the support frame 33 The
tension applied to the vibrating membrane 32 can be adjusted according to the engagement
depth. In addition, although the clip frame 34 is integrated in a frame shape at four sides, since
the connecting portion of the adjacent side is provided with a certain degree of flexibility, the
vertical direction and the horizontal direction within the bending limit of the connecting portion
It is possible to adjust tension independently of each other. Further, the vibrating membrane 32
shown in the present embodiment is terminated with a wire 32d having high flexibility along the
contour shape before forming the notches at the four corners. The wire 32 d is integrated with
the ridge line portion of the vibrating membrane 32 except for the notched portion, and the
notched portion maintains the shape before the notch processing, so the vibrating membrane 32
is addressed to the support frame 33 In this case, it can be used as an alignment guide with the
fret 35 as a guide. Further, even when a step occurs because the engagement depth of the clip
frame 34 with respect to the engagement groove 36 is different on each side of the support
frame 33, the wire 32d corresponding to the cutout portion is bent and deformed to correspond
to the step. be able to.
[0027]
In the first and second embodiments, the tension applied to the diaphragms 12 and 32 is
adjusted in accordance with the height of the frets 20 and 35 and the pressing depth of the clip
rod 23 and the clip frame 34. As with the flat speaker 41 of the third embodiment shown in FIGS.
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5 (A), 5 (B) and 5 (C), each of the support frames 43 has a square frame shaped fret 45
projecting from the front along the inner peripheral edge. Alternatively, a rectangular frame
shaped washer 46 may be provided on one side, and the vibrating membrane 42 may be fixed
with a fastening screw 44 screwed to the central portion of each side. In the case of this
embodiment, the tension applied to the vibrating membrane 42 can be adjusted by the position
where the screw insertion hole 42 a bored in the vibrating membrane 42 is formed. That is, in
the case of the present embodiment, if the fret 45, the tightening screw 44 and the screw
insertion hole 42a constitute tension tension biasing means, the distance between the upper and
lower sides or the screw insertion holes 42a between the left and right sides is narrowed. Since
the vibrating membrane 42 is screwed in a state of being pulled up and down or to the left and
right, tensile tension also increases accordingly. Also, instead of changing the position where the
screw insertion hole 42a is formed, for example, the screw insertion hole 42a itself may be
formed as a long hole, and the insertion position of the tightening screw 44 may be changed
within the range of the long hole. The tension applied to the vibrating membrane 42 can be
adjusted.
[0028]
Further, in the third embodiment, the vibrating membrane 42 is fastened and fixed by one
fastening screw 44 on each side as in the flat speaker 51 shown in FIGS. 6 (A), (B) and (C).
Alternatively, each side of the vibrating membrane 52 may be tightened and fixed to the support
frame 53 using a plurality of (here, two) tightening screws 54. In the case of this embodiment,
the washer 56 does not integrally form the four sides in consideration of ease of screw
tightening, and is divided into the upper side and the lower side, and the left side and the right
side. Integrated into the shape.
[0029]
In each of the above embodiments, the support frames 33, 43 and 53 are integrally formed on
the four sides, but like the flat speakers 61 shown in FIGS. 7 (A), (B) and (C), It is also possible to
use a support frame 63 in which four independent upper, lower, left, and right frame members
are interconnected via the adjustment screw 64. In the case of this embodiment, the adjustment
screw 64 connecting the frame members with the fret 65 protruding from the support frame 63
constitutes a tension tension biasing means, and the adjustment screw 64 is rotated forward or
reverse. The screwing length of the adjusting screw 64 can be adjusted between adjacent frame
members, and the connection distance of each side can be adjusted. Specifically, for example, by
operating the adjustment screw 64 obliquely upward to the right and extending the coupling
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distance, the frame member on the right side is separated from the frame member on the upper
side, so the tension of the vibrating membrane 62 in the diagonally upward right direction Be
enhanced. Conversely, if, for example, the adjustment screw 64 at the upper right is operated to
reduce the coupling distance, the frame member on the right side approaches the upper frame,
and the diaphragm 62 is moved in the upper right direction. Tension decreases. Similarly, by
operating the adjustment screw 64 at the lower left, the tension of the vibrating membrane 62
can be increased or decreased in the lower left direction. Furthermore, the tension of the
vibrating membrane 62 is adjusted in the diagonally upper left direction by the operation of the
adjustment screw 64 obliquely upper left, and the tension of the vibrating membrane 62 in the
diagonally lower right direction by operation of the adjustment screw 64 obliquely lower right It
can be adjusted. Thus, tension can be biased independently in the direction toward the four
apexes with respect to the vibrating membrane 62, and it is necessary for the vibrating
membrane 62 by the vector addition of the vertical or horizontal component of each tension.
Tension is given.
[0030]
Furthermore, as in the flat speaker 71 shown in FIGS. 8A, 8 B, and 8 C, the tension tension
biasing means is protruded from the inner edge portion of the support frame 73, and the fixed
film portion of the vibrating film 72. It can also be constituted by a fret 75 which abuts 72 b to
partition and form a vibrating end, and a welding portion 72 c which is heat-formed on the fixed
film portion 72 b and is shrunk at the time of heating to be welded to the support frame 73. As a
material suitable for the vibrating film 72, a PET, an acetate film, or the like having heat
shrinkability which shrinks by heating is preferable. When assembling the flat speaker 71, first,
the fixed film portion 72b of the vibrating film 72 is aligned with the support frame 73 and
addressed, and then the central portion of each side of the support frame 73 is made by a
dedicated laminator (not shown) It heats linearly along the ridgeline of the fixed film part 72b.
The portions heated by the laminator are thermally shrunk, welded to the support frame and
shrunk. That is, since the welded portion 72c contracted causes the vibrating film portion 72a to
be tensioned via the fixed film portion 72b, the adhesion of the vibrating film 72 to the support
frame 73 and the urging of the tension are achieved at once by the heating operation by the
laminator. . In this case, since the thickness of the welded portion 72c does not greatly differ
from that of the fixed film portion 72b, the entire speaker can be configured to be flat and thin.
Also, if tensile tension decreases temporarily with time, it is possible to easily restore or enhance
tensile tension by forming a new welded portion inside the existing welded portion 72c by
another heating operation. .
[0031]
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In the flat speaker 71 shown in the sixth embodiment, the heights of the frets 75 formed at the
inner edge of the support frame 73 are set to the same and uniform height on all sides, but the
flat shown in FIG. Like the speaker 81, it can be changed to the fret 85 having the arc-shaped
outline that is most raised at the central portion of each side of the support frame 83. By using
the fret 85 having a shape projecting toward the central portion, concentration of tensile tension
at the contact point of the adjacent fixed film portion 82b, that is, the four corners of the
vibrating film portion 82a of the vibrating film 82 is alleviated. Therefore, the tensile tension is
made uniform in the entire vibrating membrane portion 82a, and the whole of the membrane can
be favorably vibrated from the back central portion of the vibrating membrane portion 82a. The
welded portion 82c is formed in a straight line along the ridge line of the fixed film portion 82b
in the same manner as the flat speaker 71 described above.
[0032]
In the flat speakers 71 and 81, the upper and lower sides and the left and right sides of the heatshrinkable diaphragms 72 and 82 are welded to the support frames 73 and 83 using a laminator,
as shown in FIG. As with the flat speaker 86, the upper and lower sides and the left and right
sides of the heat-shrinkable vibrating film 87 with four corners cut off are fixed to the support
frame 88 by adhesion respectively, and heat is applied to the entire vibrating film 87 after
bonding and fixing. It can also be configured to apply tension in the left-right direction. As shown
in FIG. 10B, the vibrating film 87 used for the flat speaker 86 is obtained by cutting and
processing a film material 89 such as PET having heat contraction characteristics in a specific
uniaxial direction. That is, in consideration of the shrinkage direction of the material due to
heating indicated by the arrows in the figure, orthogonal two axes diagonally intersected with
two opposing sides of the film material 89 at an oblique angle of 0 to 90 degrees (but not
including both ends) The film material 89 is cut along a solid line so as to obtain a vibrating film
87 having upper and lower sides and left and right sides parallel to X and Y. As a result, in the
vibrating membrane 87 obtained by cutting, the heat shrinkage direction is substantially in the
diagonal direction. Therefore, after the upper and lower sides and the left and right sides of the
vibrating film 87 are adhered and fixed to the support frame 88, the vibrating film 87 shrinks in
the diagonal direction when the vibrating film 87 is heated using a flat panel heater, a hot air
machine or an infrared heater. try to. As a result, as indicated by arrows in FIG. 10A, tensile
tension is applied in the vertical and horizontal directions as a biaxial force of tensile tension in
the diagonal direction, and the vibrating membrane 87 is strained.
[0033]
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15
As described above, the application of the tensile tension by the thermal contraction property of
the film material 89 is performed on the entire vibrating membrane 87, and the above-described
vibrating membranes 72 and 82 having the configuration of generating the tensile tension at the
welded portion Different. That is, in the flat speaker 86, the thermal stress remaining on the
vibrating film 87 which has been heat-treated in a state where the four sides are adhered and
fixed to the support frame 88 and the fret 85 projecting on the support frame 88 constitute
tension tension biasing means. It is a thing. In this case, the vibrating membrane 87 in which the
entire membrane is thermally shrunk is not necessarily fixed to the support frame 88 by
adhesion, and may be fixed to the support frame 88 by a clip frame, a tightening screw or the
like. In addition, since tension tension biasing in the X and Y axis directions of the vibrating
membrane 87 is performed by one heat treatment regardless of the fixing method to the support
frame 8, there is an advantage that a manufacturing method suitable for mass production can be
easily applied. There is. Moreover, even if the vibrating film 87 is slightly slackened when the
vibrating film 87 is fixed to the support frame 88, there is no problem at all if it is slack enough
to bring the vibrating film 87 into tension by the subsequent heat treatment. In addition, since
the thermal contraction property of the vibrating membrane 87 does not disappear even after
the heat treatment, if the tensile tension of the vibrating membrane 87 of the flat speaker 86 in
use decreases with the lapse of time, the tensile strength is restored by another heating process.
It can be done.
[0034]
In the above embodiment, the flat speaker having a configuration in which the vibrator is in
contact with the back center part of the vibrating film is taken as an example, but like the flat
speaker 91 shown in FIGS. The vibrating film 72 may be formed of a transparent film, and a
plurality of vibrators 94 may be disposed in contact with the vicinity of the periphery of the
vibrating film portion 92a. The flat speaker 91 tension-supports the fixed film portion 92b of the
vibrating film 92 on the square frame shaped support frame 93, but a pair of left and right
pressing rods 99 bridged to the left and right of the upper side and lower side of the support
frame 93 A pair of vibrators 94 are attached to each of the vibrators 92. The vibratory
diaphragm portion 92a is driven to vibrate at two places on the left and right. Since the flat
speaker 91 transmits light in most of the area of the diaphragm 92 a except for the portion
overlapping the pressing rod 99, the flat speaker 91 is disposed in front of the screen of the
direct-view type CRT display 100 as shown in FIG. The sound output of the left and right
channels can be distributed to the left and right vibrators 94 and used. In this case, the vibrating
membrane 92 may be provided with a filter function for blocking harmful ultraviolet rays, and a
very compact filter / speaker as a whole can be provided.
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[0035]
In the flat speaker 91 according to the seventh embodiment, a vibrating film made of an opaque
film having a high light reflectance may be used instead of the vibrating film 92 made of a
transparent film. The flat speaker 111 shown in FIG. 13 uses the diaphragm 2 made of an
opaque film as a reflective screen for the front projection type liquid crystal projector 200, and
the screen itself for projecting an image projected from the liquid crystal projector 200 is an
audio signal. Since the vibration occurs, sound reproduction excellent in sound image localization
is possible, and a video space full of sense of reality can be constructed. However, the amplitude
of the vibrating membrane 112 is several μm and can not be captured visually, so that the
reproduced image projected on the screen does not shake and adversely affect the viewer. The
vibrator 114 shown in the present embodiment is fixed to a central portion of a presser bar 119
constructed between the center of the upper side and the center of the lower side of the support
frame 113.
[0036]
Further, although the flat speaker 111 shown in the seventh embodiment is exemplified by using
the vibrating film 112 made of an opaque film, the vibrating film 112 can also be made of a
vibrating film made of a semitransparent film. In that case, a flat panel speaker can be used as a
rear projection screen from which sound is emitted by combining with a liquid crystal projector
which projects an image from the rear side of the screen instead of the front projection type.
However, since it is necessary to open the back of the screen on which the liquid crystal
projector projects an image, the vibrator used for the flat speaker is not the back center part of
the diaphragm but the back as shown in the seventh embodiment. It should be placed at the
periphery.
[0037]
In the above embodiment, the flat speakers 11, 31, 41, 51, 61, 71, 81, 91, 111 using the
rectangular diaphragms 32, 42, 52, 62, 72, 82, 92, 112 are used. Although taken as an example,
the vibrating membrane may be any one having a polygonal shape, and a vibrating membrane
having a triangular, pentagonal or hexagonal polygonal shape may be used. In that case, when
using a polygonal diaphragm having an even number side such as a quadrangle or a hexagon,
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desired frequency characteristics can be realized by individually adjusting the tension applied to
the diagonal side. When a polygon having an odd side such as a triangle or a pentagon is used,
desired frequency characteristics can be realized by individually adjusting the tension in the
direction connecting the vertex and the side opposite to this.
[0038]
Further, in each of the above embodiments, the case of using the vibrating film made of a single
film material was taken as an example, but as in the vibrating film 310 shown in FIG. It can also
be used. The two film materials are a square-shaped vertical film 311 in which the fixed film
portion 311b is continuous with the upper and lower sides of the vibrating film portion 311a,
and a square-shaped horizontal film 312 in which the fixed film portion 312b is continuous with
the right and left of the vibration film portion 312a. . The vertical film 311 and the horizontal
film 312 are formed by superposing the diaphragms 311a and 312a with each other, and several
droplets of liquid 313 such as water or oil are inserted between the diaphragms 311a and 312a.
The vibrating film portions 311 a and 312 a are united due to surface tension. The vibrating
membrane 310 shown in the present embodiment requires two membrane materials, the
longitudinal membrane 311 and the transverse membrane 312, but the longitudinal membrane
311 and the transverse membrane 312 are integrated by the surface tension of the liquid 313
interposed therebetween. For example, the vibrating membrane portion 311a of the combined
longitudinal membrane 311 is vertically shrunk from the fixed membrane portion 311b by
heating shrinkage along the ridge line by a laminator etc. addressed to a support frame (not
shown). The tensile tension can be applied to the vibrating membrane portion 312 a of the
transverse membrane 312 from the fixed membrane portion 312 b in the left-right direction. For
this reason, as in the case of a vibrating film consisting of a single rectangular film with four
corners cut off, when tensile tension is applied in all directions, tensile tension does not
concentrate on the notches and not in the vertical and horizontal directions. The tension tension
of each can be equalized to ensure stable vibration over a long period of time.
[0039]
In addition, the vibrating membrane 310 exerts a tensile tension in the vertical direction via the
longitudinal membrane 311 on the combined vibrating membrane portions 311 a and 312 a and
applies a tensile tension in the lateral direction via the transverse membrane 312. A flat speaker
(not shown) can be configured, and in that case, the tensile tension in the vertical direction and
the tensile tension in the lateral direction can be variably set without interference with each
other. In addition, since such diaphragms 311a and 312a have a weight for two membrane
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materials, such flat speakers require more driving force than driving a single membrane material,
but the vertical and horizontal directions Since each tensile tension of each is made uniform,
stable driving over a long period of time is possible. The diaphragm 310 is replaced with the
diaphragms 12, 32, 42, 52, 62, 72, 82, 92, 112, and any of the flat speakers 11, 31, 41, 51, 61,
71, 81, 91, 111 can also be applied. Also, in the above explanation, the vibrator was described as
being assembled by bringing the piston plate at the tip into contact with the vibrating
membranes 12, 32, 42, 52, 62, 72, 82, 92, 112, 310. In addition to this type of contact assembly,
the piston plate of the vibrator can also be coupled to the vibration film by, for example, pressure
contact or adhesion. However, even when the method of bonding the vibrator to the vibrating
film by such pressure contact or adhesion is adopted, since the vibrating film itself is pulled in
four directions, it is sufficient to use the temporary fixing degree, and the bonding location is
excessive. Strength is not required.
[0040]
As described above, according to the first aspect of the present invention, the vibrating
membrane according to the present invention is independent of each other in the polygonal
vibrating membrane section vibrated from the outside and vibrated, and for each side of the
vibrating membrane section. And the fixed film portion is formed integrally with the peripheral
portion and is supported and fixed in a state where the tensile force is applied to the vibrating
film portion. By supporting the section in a tension state, the vibration energy applied to the
vibrating membrane section can efficiently drive the vibrating membrane section, and the
function as the sounding body can be fully realized with a slight driving force. Since the vibrating
membrane section in the polygonal shape has variously different distances from the excitation
point to each side, the resonance frequency is widely dispersed, which enables the reproduction
of sound in a wide band, and further, the tension applied to the vibrating membrane section By
adjusting the reproduction frequency characteristics according to the application Freely excellent
effects such as can be variably adjusted.
[0041]
The vibrating membrane of the present invention according to claim 6 is formed by forming
rectangular notches at the four corners of a quadrangular film material, and passes through a
line connecting the cut apexes of the respective notches or the vicinity thereof. Since it comprises
a square-shaped vibrating membrane section surrounded by a line and a fixed membrane section
consisting of a region obtained by removing the vibrating membrane section from the molded
membrane material, a rectangular shape is formed at the four corners of the square-shaped
membrane material. By forming the notches, the vibrating film portion and the fixed film portion
can be easily manufactured at the same time, and it is possible to form the vibrating films of
various sizes uniformly and in large quantities.
11-05-2019
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[0042]
Further, in the vibrating membrane of the present invention, the vibrating membrane portion and
the fixed membrane portion are made of polyethylene terephthalate or metal-deposited
polyethylene terephthalate, polyethylene naphthalate or metal-deposited polyethylene
naphthalate, or carbon fiber Therefore, using a synthetic resin material or synthetic fiber suitable
for film processing and a film material having high tension resistance, stable vibration
characteristics can be maintained over a long period of time, and metal deposition on the film
material is further achieved. By increasing the tensile rigidity by applying the above-mentioned, it
is possible to achieve an effect such as being able to constantly maintain stable vibration
characteristics with almost no deterioration over time.
[0043]
Further, in the flat speaker of the present invention according to the fifth aspect, each side is
supported by the support frame in a state where a tensile tension from the central portion to the
peripheral portion is applied to the polygonal diaphragm, and Since the vibrating membrane is
driven to vibrate by the vibrator which is in contact with it, the polygonal vibrating membrane
whose distance from the driving point of the vibrator to the peripheral edge changes depending
on the azimuth is the peripheral edge from the driving point at the central portion on the back
surface Unlike a circular diaphragm in which the distance to the part coincides in all directions, it
has a sufficiently wide reproduction frequency band to have a large number of resonance
frequencies, and further has a polygonal shape consisting of even sides such as a square or a
hexagon. In the case of using a vibrating membrane, desired frequency characteristics can be
realized by individually adjusting the tension applied to the diagonal sides, while a polygonal
vibrating membrane having an odd side such as a triangle or a pentagon When used, the desired
frequency characteristics can be realized by individually adjusting the tension in the direction
connecting the apex and the opposite side, and the vibrator does not have to be fixed to the back
of the diaphragm, The time required for assembling the speaker can be shortened because it is
only necessary to simply abut, and the fixing point does not regulate the vibration of the
vibrating membrane, and the vibrating membrane is supported by pulling in all directions. The
strength of the inner damper is unnecessary, and the damper does not inhibit the light movement
of the movable part, and moreover, there is no positional deviation when the vibrator is brought
into contact with the vibrating membrane, so There is no need to secure an axial tilt room in the
movable part, thereby minimizing the magnetic gap in the vibrator and increasing the magnetic
efficiency to the limit, thus making it possible to reduce the weight of the vibrating film biased
with tension. A special power amplifier is required because it can generate sufficient sound
volume with a sufficient amount of vibration, generate a sufficient volume with a small amount of
drive power, and can also directly drive directly to the headphone output terminal attached to
audio or video equipment. Is suitable for speakers for non-portable AV equipment, and since the
diaphragm is supported by the support frame in tension, it is basically the same as a
11-05-2019
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conventional flat speaker whose peripheral edge is a free end, With the progress of use, the
planar shape is lost due to the hygroscopic effect, piston vibration can not be expected and the
reproduced sound is not lacking in vividness, high-quality reproduction characteristics can be
constantly maintained, and furthermore the diaphragm is driven. The vibrator is only in contact
with the vibrating membrane at the driving point, so a plurality of vibrating membranes with
different printed patterns or designs or a photo can be freely attached. If a vibrating film is
prepared, the user can select one of them from among these vibrating films, and the vibrator can
replace only the vibrating film as it is, and as a photo frame or interior decoration There are
outstanding effects such as being able to provide end-user-oriented usability with reduced
exchange costs, taking into consideration the use of
[0044]
In the flat speaker of the present invention according to the seventh aspect, the four sides of the
rectangular diaphragm having four corners cut away are each drawn in the form of a
quadrilateral in a state in which tensile tension is individually applied to upper and lower sides
and left and right sides separately. The vibrating membrane is driven by the vibrator supported
by the support frame of the above and the vibrator is in contact with the back surface of the
vibrating membrane, so that the square vibration whose distance from the driving point of the
vibrator to the peripheral portion changes depending on the orientation As a feature of the film,
a sufficiently wide reproduction frequency band can be obtained by the presence of a large
number of resonance frequencies, and furthermore, the rectangular diaphragm individually
applies tensile tension in the separation direction to upper and lower sides and left and right
sides. Thus, the desired frequency characteristics can be realized, and since the four corners of
the diaphragm are notched, the tension can be freely set freely without causing the tensile
tension in the vertical direction and the tensile tension in the lateral direction to interfere with
each other. The vibrator does not have to be fixed to the back of the vibrating membrane, but
only needs to be in contact, so the time required for assembling the speaker can be shortened,
and the fixing point regulates the vibration of the vibrating membrane. Because the vibrating
membrane is supported in a tensile manner in all directions, the damper in the exciter does not
require any strength, and the damper does not inhibit the light movement of the movable part,
and the exciter It is not necessary to secure an axial inclination room in the movable part in the
vibrator since the posture does not occur when bringing the diaphragm into contact with the
diaphragm, thereby minimizing the magnetic gap in the vibrator The efficiency can be maximized
so that the tension-tensioned vibrating membrane can be used as a lightweight but sufficient
source of vibration, and a sufficient driving force can be generated with a small driving force.
Because it can also be directly driven directly to the headphone output terminal attached to the
unit, it is suitable for speakers for portable AV equipment that does not require a special power
amplifier, for example, a plastic case that accommodates a CD (compact disc). By finishing it as an
external speaker, full-fledged acoustic reproduction is possible on the road, and since the
vibrating membrane is supported by the support frame in a tensed state, it is basically the case
11-05-2019
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that the peripheral part is a free end. Unlike the flat speaker, the flat shape is lost due to the
hygroscopic effect with the use progress, piston vibration can not be expected, and the
reproduced sound is not lacking in vividness, and high-quality reproduction characteristics can
be constantly maintained. Furthermore, since the vibrator that drives the vibrating membrane is
only in contact with the vibrating membrane at the driving point, a plurality of printed patterns
and designs are different. When a diaphragm is prepared, the user can select one sheet of the
diaphragms from among these diaphragms, and it is possible to replace only the diaphragm as it
is, and the vibrator can be used as an indoor decoration. In addition, there are excellent effects
such as being able to provide end-user-oriented usability with reduced replacement cost.
[0045]
Still further, in the flat speaker of the present invention according to claim 7, the tension tension
biasing means is provided to protrude on the inner edge of the support frame, and a fret which
abuts on the fixed film portion to define a vibrating end. And an engaging groove bored in the
support frame, and a clip member engaged with the engaging groove to lock a part of the fixed
membrane portion of the vibrating membrane in the engaging groove. When the clip member is
engaged in the engagement groove in a state in which the fixed membrane portion of the
vibrating membrane is engaged, a portion of the fixed membrane portion is tightly held between
the clip member and the engagement groove And the fixed film portion locked by the frictional
force acting on the close contact surface supports the vibrating film portion with a tensile tension
corresponding to the engagement depth of the clip member, and thereby the fixed film
surrounded by the fret Effects such as keeping the part in a proper tension state and achieving
the desired vibration characteristics Achieve the.
[0046]
In addition, the tension tension biasing means is provided on the inner edge of the support frame
so as to protrude from the inner edge portion of the support frame, and abuts on the fixed film
portion to define the vibrating end. Since the adjustment screw is configured to adjust the
connection distance variably, the connection distance between adjacent two sides of the four
sides of the support frame can be variably adjusted by tightening the adjustment screw or vice
versa. By adjusting the distance of the four joints separately, the tension applied to the vibrating
membrane can be freely adjusted, and fine tension adjustment according to the screw feed
amount of the adjustment screw can be accurately performed. It produces effects such as
[0047]
Further, the tension tension biasing means, the tension tension biasing means is provided so as to
protrude from the inner edge portion of the support frame, and a fret which abuts on the fixed
membrane portion to define a vibrating end, and the vibrating membrane The fixed film portion
11-05-2019
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of the vibrating membrane is formed by heating and shrinks when heated, and the welding
portion is welded to the support frame. Therefore, the fixed film portion of the vibrating
membrane is directed to the support frame and heated from the outside. When it is shrunk and
welded to the support frame, the welded portion contracts and tensions the vibrating membrane
portion via the fixed membrane portion. Therefore, the fixation of the vibrating membrane to the
support frame and the biasing of the tension are externally heated. Therefore, the thickness of
the welded portion does not differ greatly from that of the fixed film portion, so that the entire
speaker can be configured to be flat and thin, and if the tensile tension decreases temporarily
with time, Existing weld by heating again By forming the new welded portion on the inside, an
effect equal restoring elastic tension or enhancement is easily possible.
[0048]
The vibrating membrane according to claim 6 is formed from a square film material provided
with heat shrinkability only in a specific uniaxial direction, and divided by four sides parallel to
orthogonal two axes oblique to the specific uniaxial direction. When the tensile tension biasing
means is protruded from the inner edge of the support frame and heat shrinks the vibrating
membrane in a state where the fixed film portion of the vibrating membrane is supported and
fixed to the support frame Since the vibrating membrane is in close proximity to the fixed
membrane portion and has a fret for tensioning the vibrating membrane in the orthogonal two
axial directions to define the vibrating end, the heating process is performed by one heat
treatment regardless of the fixing method to the support frame. The tensile tension can be biased
in two orthogonal directions of the vibrating membrane, which makes it possible to easily apply
the manufacturing method suitable for mass production, and the vibrating membrane is
somewhat slackened when the vibrating membrane is fixed to the support frame. Also, the
vibrating film by the subsequent heat treatment There is no problem at all if it is slack to the
tension state, and furthermore, the thermal contraction property of the vibrating membrane does
not disappear even after heat treatment, so the tensile tension of the vibrating membrane of the
flat speaker in use diminishes with the passage of time In such a case, the effect of being able to
recover the tension by heat treatment again is exhibited.
[0049]
Furthermore, in the flat loudspeaker of the present invention according to claim 12, the vibrating
membrane is made of a transparent membrane or a semitransparent membrane through which at
least the vibrating membrane portion transmits light, and the vibrator is near the periphery of
the vibrating membrane portion The diaphragm section is driven to vibrate at a plurality of
locations vertically and horizontally or left and right, and most of the area at the center of the
diaphragm section is a light transmission area, for example, in front of a direct-view type CRT
display or liquid crystal display. The transparent diaphragm placed in the panel is used as a
sound generator with filter function to block harmful ultraviolet rays, to simultaneously achieve
11-05-2019
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visual protection and improvement in hearing, or alternatively, a translucent diaphragm on the
front of the rear projection type liquid crystal projector By arranging and displaying an image
rear-projected from the liquid crystal projector on a vibrating film, it is possible to provide a
screen that produces a sound with good sound image localization.
[0050]
In the flat speaker of the present invention according to the thirteenth aspect, the vibrating film
is an opaque film in which at least the vibrating film portion does not transmit light, and the
vibrator is disposed in the vicinity of the center of the vibrating film portion. From this, it is used
as a reflective screen for a liquid crystal projector, for example, and an image projected from a
front projection type liquid crystal projector is projected onto a vibrating film, and the vibrating
film is vibrated by a vibrator to reproduce sound excellent in sound image localization. It is
possible to produce an effect such as being able to construct a video space full of audio presence.
[0051]
According to a fourteenth aspect of the present invention, there is provided a vibrating film
according to the present invention, which includes a rectangular vertical film in which the fixed
film section is connected to the upper and lower sides of the vibrating film section, and a
rectangular horizontal film in which the fixed film section is connected to the left and right of the
vibrating film section. Since it comprises a liquid which is interposed between the vibrating
membrane portions in a state where the vibrating membrane portions of the horizontal
membrane and the longitudinal membrane are superimposed and which unites the vibrating
membrane portions by surface tension, the longitudinal membrane and the horizontal membrane
Although two membrane materials of the membrane are required, since the longitudinal
membrane and the transverse membrane are integrated by the surface tension of the liquid
interposed in the middle, the combined vibrating membrane portion is vertically interposed via
the longitudinal membrane. It can apply tensile tension in the lateral direction through the
transverse membrane, and therefore exerts tensile tension in all directions like a vibrating
membrane consisting of a square single membrane with four corners cut off. Tension does not
concentrate at the top of the notch when And downward direction in the horizontal direction
each pulling tension homogenized respectively, an excellent effect such as can be promises longterm stable oscillation.
[0052]
According to a fifteenth aspect of the present invention, there is provided a flat loudspeaker
according to the fifteenth aspect of the present invention, comprising: the diaphragm according
to the fourteenth aspect; Tensioning means for applying tension to the vibrating membrane
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portion of the longitudinal membrane vertically to the vibrating membrane portion of the
longitudinal membrane with respect to the vibrating membrane supported by the support frame;
A vibrator which is supported by the support frame and is in contact with the back surface of the
vibrating membrane portion of the vibrating membrane and vibrates the vibrating membrane
portion is provided, so that the distance from the driving point of the vibrator to the peripheral
portion As a feature of the rectangular vibrating membrane part whose orientation changes
depending on the orientation, the presence of a large number of resonance frequencies makes it
possible to acquire a sufficiently wide reproduction frequency band, and further, the vibrating
membrane part which has been united via the longitudinal membrane. Vertical tensile tension,
and through the transverse membrane Since tensile tension can be applied in the lateral
direction, the tensile tension in the vertical direction and the tensile tension in the lateral
direction can be freely set without interference with each other, and the vibrating membrane
portion is for two membrane materials Because it has weight, more driving force is required
compared to driving a single membrane material, but since each tensile tension in the vertical
and horizontal directions is equalized, stable driving for a long time is possible. An effect such as
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