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DESCRIPTION JPH10341498

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DESCRIPTION JPH10341498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker in which the elasticity of a damper is improved to increase the allowable range of
vibration amplitude of a voice coil bobbin.
[0002]
2. Description of the Related Art In recent years, small-sized, space-saving sound reproducing
devices have been used, and the speakers used for sound reproducing devices for such
applications are often small in diameter. FIG. 15 is a sectional view showing an example of the
structure of a conventional small-aperture speaker. The speaker of such a structure is
demonstrated below.
[0003]
In the speaker 1 shown in FIG. 15, an annular magnetic circuit 6 including a center pole 3, a
magnet 4 and a top plate 5 is formed at the lower end portion of the annular frame 2. A magnetic
flux of high density is generated in an annular space 7 formed by the upper outer peripheral
portion of the center pole 3 and the inner peripheral portion of the top plate 5, and the voice coil
bobbin 8 is held so as to freely vibrate vertically. The voice coil bobbin 8 is generally a member
obtained by forming thin paper into a cylindrical shape, and a voice coil 9 is wound around the
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outer periphery of the lower end portion.
[0004]
The voice coil 9 generates an electromagnetic force to cause the voice coil bobbin 8 to vibrate
when a drive current is applied as an audio signal, and is made of, for example, a wire material
such as aluminum or copper. The reinforcing paper 10 is wound around the outer periphery of
the voice coil bobbin 8 except for the lower end thereof, and the rigidity of the voice coil bobbin
8 is secured. The diaphragm 11 and the damper (also referred to as a suspension) 12 are fixed to
such a voice coil bobbin 8. The diaphragm 11 is vibratably attached to the frame 2 of the speaker
via the edge 13. The damper 12 is also referred to as a corrugation damper, and its outer
peripheral portion is directly attached to the frame 2 and holds the voice coil bobbin 8 in a freely
vibrating manner.
[0005]
In the speaker 1 configured as described above, when a drive current proportional to the audio
signal is applied to the voice coil 9, an electromagnetic drive force is generated by the drive
current and the magnetic flux in the air gap 7, and the diaphragm 11 is It is held at 13, vibrates
up and down, and outputs a sound.
[0006]
However, in the conventional small-sized speaker 1 shown in FIG. 15, since the aperture of the
diaphragm 11 is small, in order to obtain a predetermined sound pressure, the vibration
amplitude of the diaphragm 11 is changed to the diaphragm The amplitude must be increased in
inverse proportion to the area, and the vibration amplitude must be increased in inverse
proportion to the square of the frequency.
For this reason, it has been difficult to secure a very large amplitude, particularly in a low
frequency region, in a small speaker.
[0007]
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The structure of a conventional damper 12 supporting a diaphragm is shown in FIG. The damper
12 is formed by corrugating resin-impregnated fibers, and a large number of corrugated cross
sections are formed concentrically as shown by the central profile line in the figure.
[0008]
As shown in FIG. 17, the damper 12 elastically supports the voice coil bobbin 8 vibrating up and
down. When the amplitude of the diaphragm 11 is large, the waveform of the damper shown by
the original broken line is deformed, and the material of the damper 12 is stretched as shown by
the solid line. As it is stretched, the vertex a of the waveform moves to a '. In order to move the
apex a of the waveform to a ', the radius r1 of the central circle constituting the waveform must
increase to r2. The line connecting the tops of one waveform of the damper is concentric and
does not originally have a mechanism of increasing radius. Therefore, in order for the radius r1
to change to r2, the material of the damper 12 itself must be stretchable in the circumferential
direction.
[0009]
However, since the material of the damper 12 is resin impregnated fiber, the elastic force of the
material itself is small. On the other hand, as the amplitude increases, the change in the radius of
the concentric circle must also increase, but since the elongation of the material itself is small,
the increase in the radius becomes difficult, and as a result, the increase in amplitude is limited.
[0010]
FIG. 18 is a graph showing the relationship between the force applied to the damper 12 via the
voice coil 9 and the vibration amplitude in the axial direction (Z-axis) of the innermost peripheral
portion of the damper 12. As shown, the amplitude characteristic becomes non-linear from a
force of 3N or more, and the amplitude value is saturated. As described above, in the
conventional small-sized speaker, since the damper has a structure that is not easily deformed
with large amplitude, large-input sound can not be reproduced, and in particular, the bass
reproduction characteristics are bad and distortion is increased. The
[0011]
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The present invention has been made in view of such conventional problems, and by providing a
damper having a structure capable of large amplitude deformation, it is possible to provide a
speaker with excellent bass reproduction characteristics and little distortion. Aim.
[0012]
SUMMARY OF THE INVENTION In order to solve the above problems, the invention according to
claim 1 of the present application is a diaphragm for giving air vibration, a cylindrical voice coil
bobbin joined to the diaphragm, and the voice In a speaker having a damper for supporting a
voice coil fixed to an outer peripheral portion of a coil bobbin in a magnetic gap formed by an
annular top plate and a center pole, the damper is a voice coil bobbin attached to the outer
peripheral portion of the voice coil bobbin A mounting plate, and an arc-shaped spring member
having one end connected to the periphery of the voice coil bobbin mounting plate and the other
end fixed to the speaker frame.
[0013]
According to such a configuration, since the spring member is independent in the circumferential
direction of the voice coil bobbin when the diaphragm vibrates up and down, material expansion
and contraction in the circumferential direction are not required.
Therefore, the spring member is easily deformed, the damper has a large vibration amplitude,
and the linearity of the force displacement curve is excellent.
[0014]
The invention according to claim 2 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
peripheral part of the voice coil bobbin, an annular top plate and a center In a speaker having a
damper supported in a magnetic gap formed by poles, the damper is connected to a voice coil
bobbin mounting plate attached to an outer peripheral portion of the voice coil bobbin along one
edge of the voice coil bobbin mounting plate The other end is characterized by having a plurality
of arc-shaped spring members fixed to the speaker frame, and a connecting member connecting
the spring members.
[0015]
The invention according to claim 3 of the present application is characterized in that, in the
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speaker according to claim 2, the spring member and the connection member of the damper are
integrally molded of a resin having elasticity.
[0016]
According to such a configuration, since the spring member is connected by the connecting
member along the outer peripheral portion of the voice coil bobbin mounting plate, it is possible
to prevent the vibration perpendicular to the vibration direction of the voice coil and to resist
rolling. Can.
[0017]
The invention according to claim 4 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
peripheral portion of the voice coil bobbin, an annular top plate and a center In a speaker having
a damper supported in a magnetic gap formed by poles, the damper is provided on a polygonal
voice coil bobbin mounting plate attached to an outer peripheral portion of the voice coil bobbin
and on each side of the voice coil bobbin mounting plate. A plurality of spring structures
connected at one end, and a mounting piece supported by the speaker frame and coupled to the
other end of the spring structure are characterized.
[0018]
The invention according to claim 5 of the present application is characterized in that, in the
loudspeaker according to claim 4, the spring structure is constituted by a connected body of a
visco-elastic member and a stretchable elastic member.
[0019]
According to such a configuration, the spring structure is formed by connecting the visco-elastic
member and the elastic member that can be easily expanded and contracted, and is independent
in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and
down. Does not require material stretching in the direction.
Therefore, the elastic member is easily deformed, the damper has a large vibration amplitude,
and the characteristics of the linearity of the force displacement curve become excellent.
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Furthermore, the damping of the visco-elastic member can prevent the resonance of the damper.
[0020]
The invention according to claim 6 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
peripheral portion of the voice coil bobbin, an annular top plate and a center In a speaker having
a damper supported in a magnetic gap formed of poles, the damper is a plurality of arc-shaped
spring members having one end fixed to the outer periphery of the voice coil bobbin and the
other end fixed to the speaker frame It is characterized by a certain thing.
[0021]
According to such a configuration, since the spring member is independent in the circumferential
direction of the voice coil bobbin when the diaphragm vibrates up and down, material expansion
and contraction in the circumferential direction are not required.
Therefore, the spring member is easily deformed, the damper has a large vibration amplitude,
and the linearity of the force displacement curve is excellent.
[0022]
The invention according to claim 7 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
periphery of the voice coil bobbin, an annular top plate and a center In a speaker having a
damper supported in a magnetic gap formed by poles, the damper includes an annular voice coil
bobbin attaching portion fixed to an outer peripheral portion of the voice coil bobbin, and an
annular frame fixed to a speaker frame A mounting portion, and a plurality of arc-shaped spring
members connecting the voice coil bobbin mounting portion and the frame mounting portion in
the radial direction of the voice coil bobbin are provided.
[0023]
The invention according to claim 8 of the present application is the speaker according to claim 7,
characterized in that the voice coil bobbin attachment portion, the frame attachment portion, and
the spring member of the damper are integrally molded of a resin having elasticity. It is said that.
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[0024]
According to such a configuration, since the spring member is independent in the circumferential
direction of the voice coil bobbin when the diaphragm vibrates up and down, material expansion
and contraction in the circumferential direction are not required.
Therefore, the spring member is easily deformed, the damper has a large vibration amplitude,
and the linearity of the force displacement curve is excellent.
[0025]
The invention according to claim 9 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
peripheral portion of the voice coil bobbin, an annular top plate and a center In a speaker having
a damper supported in a magnetic gap formed by poles, the damper includes an annular voice
coil bobbin attaching portion fixed to an outer peripheral portion of the voice coil bobbin, and an
annular frame fixed to a speaker frame A mounting portion, a plurality of arc-shaped spring
members connecting the voice coil bobbin mounting portion and the frame mounting portion in a
radial direction of the voice coil bobbin, and a plurality of spring members along a direction
parallel to the outer periphery of the voice coil bobbin And a connecting member connected to
each other.
[0026]
The invention according to claim 10 of the present application is the speaker according to claim
9, wherein the voice coil bobbin attachment portion, the frame attachment portion, the spring
member, and the connection member of the damper are integrally molded of resin having
elasticity. It is characterized by
[0027]
The invention according to claim 11 of the present application is the speaker according to claim
9, characterized in that the connection member is an annular member having elasticity, in which
arc portions having the same pitch as the arrangement interval of the spring members are
connected. It is said that.
[0028]
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According to such a configuration, the spring member is connected by the expandable
connecting member disposed concentrically with the annular member, thereby preventing lateral
vibration of the voice coil and strengthening against rolling. Can.
[0029]
The invention according to claim 12 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
periphery of the voice coil bobbin, an annular top plate and a center In a speaker having a
damper supported in a magnetic gap formed by poles, the damper is a roll damper in which a
roll-like structure having a circular arc cross section and a voice coil bobbin mounting plate are
integrally formed, and the outer peripheral portion is a speaker frame And a circular corrugation
damper having an inner peripheral portion bonded to the roll structure and a sheet having a
bending elasticity formed into a concentric corrugation.
[0030]
The invention according to claim 13 of the present application is a diaphragm for giving air
vibration, a cylindrical voice coil bobbin joined to the diaphragm, a voice coil fixed to the outer
periphery of the voice coil bobbin, an annular top plate and a center In a speaker having a
damper supported in a magnetic gap constituted by poles, the damper is a circular corrugation
damper in which a sheet having bending elasticity is formed concentrically in a corrugation, an
inner annular member and an outer annular member having different radii. And an arc-shaped
spring member radially connecting the inner ring member to the outer periphery of the voice coil
bobbin, and the outer ring member coupled to the inner periphery of the corrugation damper.
The outer periphery of the corrugation damper is fixed to the speaker frame.
[0031]
According to such a configuration, since the spring member is independent in the circumferential
direction of the voice coil bobbin when the diaphragm vibrates up and down, material expansion
and contraction in the circumferential direction are not required.
Therefore, the spring member is easily deformed, the damper has a large vibration amplitude,
and the linearity of the force displacement curve is excellent.
In addition, a corrugation damper connected to the spring member can increase the center
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holding force and resist rolling, and can provide appropriate stiffness.
[0032]
The invention according to claim 14 of the present application is characterized in that, in the
speaker according to any one of claims 1 to 13, the spring member of the damper is formed of a
piano wire.
[0033]
The invention according to claim 15 of the present application is the speaker according to any
one of claims 1 to 13, characterized in that the spring member of the damper is made of a
polymer resin wire.
[0034]
According to such a configuration, since the spring member is formed of a piano wire or a
polymer wire, the rigidity does not fluctuate even under high temperature and high humidity
without being affected by humidity.
Therefore, the bass characteristic of the speaker becomes stable even if the environmental
temperature changes.
[0035]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A loudspeaker according
to a first embodiment of the present invention will be described with reference to the drawings,
focusing on the structure of a damper.
In the drawings of the respective embodiments, the same parts as those of the conventional
example are denoted by the same reference numerals, and the detailed description is omitted.
FIG. 1 is an external perspective view of a spring member 20 which constitutes a part of a
damper used in the speaker according to the first embodiment.
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The spring member 20 is a semicircular shape formed of a wire impregnated with a
thermosetting resin and a thick thread.
At both ends thereof, a voice coil bobbin mounting plate to be described later and mounting
portions 21a and 21b for connecting to a frame of the speaker are formed.
[0036]
In FIG. 1, the linear spring member 20 is formed in a semicircular shape, but it may be an oval or
an oval obtained by combining a semicircle with a straight line.
In addition to the linear shape, a thin plate shape may be used.
FIG. 2 is an external view of the damper 22 according to the present embodiment.
The damper 22 is composed of a substantially square voice coil bobbin mounting plate 24 and a
plurality of spring members 20 attached to the four corners thereof.
A through hole 23 for fixing the voice coil bobbin 8 is formed at the center of the voice coil
bobbin mounting plate 24.
The spring member 20 and the voice coil bobbin mounting plate 24 are joined by adhesion at the
mounting portion 21a.
[0037]
Assuming that the vibration direction of the voice coil bobbin 8 is Z axis and the front of the
speaker is + and the back is-, the spring members 20 at the four corners are semicircular elastic
members having the same sectional shape and convex in the + Z direction. is there.
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FIG. 3 is a half sectional view of the speaker 1A having such a damper 22. As shown in FIG. As
shown in FIGS. 2 and 3, one mounting portion 21 b of the spring member 20 has the same height
as the voice coil bobbin mounting plate 24 and is connected to the mounting surface of the frame
2. The through holes 23 of the voice coil bobbin mounting plate 24 are fixed to the outer
peripheral surface of the voice coil bobbin 8 by an adhesive.
[0038]
The operation of the speaker 1A having the damper 20 having such a structure will be described
with reference to FIG. When a driving current flows through the voice coil 9, a driving force is
generated on the voice coil bobbin 8 by the electromagnetic force, and the diaphragm 11
vibrates in the + Z and -Z directions to generate a sound. The damper 22 and the edge 13
elastically support the diaphragm 11 when the diaphragm 11 reciprocates.
[0039]
FIG. 4 is a cross-sectional view showing a deformed state of the damper 22 when the diaphragm
11 vibrates in the + Z direction. Since the voice coil bobbin mounting plate 24 is fixed to the
outer peripheral surface of the voice coil bobbin 8, one mounting portion 21 a of the damper 22
vibrates integrally with the voice coil bobbin 8. On the other hand, the other attachment portion
21 b of the damper 22 is fixed to the frame 2 and is not displaced.
[0040]
In FIG. 4, the mounting portion 21a is displaced from A1 to A2 during vibration, and elastically
supports the vibration displacement of the diaphragm 11. The spring members 21 are arranged
in a straight line from the four corners of the damper attachment plate 24 as viewed in the Z-axis
direction, and are resiliently independent of each other. There is no circumferential contraction
or stretching as in Therefore, the force-displacement characteristic is excellent in linearity, and
the maximum amplitude of the voice coil bobbin 8 can also be increased.
[0041]
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FIG. 5 is a graph showing an example of the force-displacement characteristics of the damper 20
of the present embodiment, that is, the electromagnetic force of the voice coil and the
displacement of the innermost circumferential portion of the damper. Here, the linearity of
displacement is secured up to an external force of 5 N, and the amplitude up to 5 mm is secured.
Thus, it can be seen that, as compared with the conventional characteristics shown in FIG. 18,
both the linearity and the maximum amplitude exhibit excellent characteristics. In the present
embodiment, the voice coil bobbin mounting plate 24 has a quadrangular shape, but may have
another polygonal shape or a circular shape as long as the circular through hole 23 is secured.
[0042]
Second Embodiment A loudspeaker according to a second embodiment of the present invention
will now be described. In the damper of the present embodiment, a piano wire or a wire (polymer
wire) of a polymer resin is formed in a semicircular shape as a material of the spring member 20
instead of a cloth or thick yarn impregnated with a thermosetting resin. It is a thing. In addition,
since the shape of a damper and the structure of a speaker are the same as Embodiment 1,
description of those is abbreviate | omitted.
[0043]
The operation of the damper having such a structure will be described. Since the spring member
20 is formed of a piano wire or a polymer wire, the rigidity is unlikely to fluctuate even under
high temperature and high humidity conditions without being affected by humidity, and the bass
characteristic of the speaker is stably maintained.
[0044]
Third Embodiment Next, a loudspeaker according to a third embodiment of the present invention
will be described with reference to the drawings, focusing on the structure of a damper. FIG. 6 is
an external perspective view showing the structure of the damper 30 used in the speaker 1B of
the present embodiment. The same portions as those of the first embodiment are denoted by the
same reference numerals and detailed description thereof is omitted. The outer shape of the
spring member 20 constituting the damper 30 is the same as that shown in FIG. 1 except that
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connecting members 31a and 31b are newly provided.
[0045]
Similar to FIG. 2, two spring members 20 are respectively joined to the four corners of the voice
coil bobbin mounting plate 24. Further, along each side of the voice coil bobbin mounting plate
24, two connecting members 31a and 31b are joined so as to connect the pair of spring
members 20. The connecting member 31 a connects the upper portion of the spring member 20,
and the connecting member 31 b is a linear member connecting the mounting portion 21 b of
the spring member 20. With such a structure, the spring member 20 is less likely to be deformed
in directions other than the Z direction, and the vibration direction of the voice coil bobbin 8 can
be regulated only in the Z axis direction. In addition, all the spring members 20 and all the
connection members 31a and 31b may be integrally molded of resin having elasticity.
[0046]
As in the case of FIG. 1, one mounting portion 21 b of the spring member 20 has the same height
as the voice coil bobbin mounting plate 24 and is fixed by the mounting surface of the frame 2.
The through holes 23 of the voice coil bobbin mounting plate 24 are fixed to the outer peripheral
surface of the voice coil bobbin 8 by an adhesive.
[0047]
The vibration characteristic of the damper 30 having such a structure will be described. The
spring member 20 is connected to each side of the voice coil bobbin mounting plate 24 together
with the connecting members 31a and 31b. The connecting members 31a and 31b have no
influence on the vibration in the Z direction, that is, the vibration of the normal diaphragm 11.
However, upon deformation in the X and Y directions, the connecting members 31a and 31b
exert resistance to each other. For example, when the voice coil bobbin 8 tries to vibrate in the X
direction, the connecting members 31a and 31b parallel to the X direction do not easily deform
with respect to the vibration, and work to hold the vibration system at the center. The same
applies to the Y-axis direction. As a result, the connecting members 31a and 31b do not affect
the Z direction, which is the normal vibration direction, and act as a resistance in other
directions, thereby preventing the voice coil bobbin 8 from rolling.
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[0048]
Fourth Embodiment Next, a loudspeaker according to a fourth embodiment of the present
invention will be described with reference to the drawings, focusing on the structure of a damper.
FIG. 7 is a plan view showing the structure of the damper 40 used in the speaker 1C of the
present embodiment.
[0049]
As shown in FIG. 7, the damper 40 holds a square voice coil bobbin mounting plate 42, four sets
of spring members 41 supporting each side of the voice coil bobbin mounting plate 42, and the
other end of each set of spring members 41. Mounting pieces 43a, 43b, 43c, 43d. The mounting
pieces 43 a to 43 d have the same height as the voice coil bobbin mounting plate 42 in the Z-axis
direction, and are joined at the mounting surface of the frame 2. The through holes 44 of the
voice coil bobbin mounting plate 42 are fixed to the outer peripheral surface of the voice coil
bobbin 8 by an adhesive.
[0050]
FIG. 8 is a perspective view showing a configuration example of the spring member 41. As shown
in FIG. The spring member 41A shown in FIG. 8A is a combination of a two visco-elastic member
44 and a coil spring 45 formed of a piano wire or a polymer wire, and can be easily expanded
and contracted when the diaphragm is vibrated. It is characterized by The viscoelastic member
44 is preferably made of a high loss material such as high molecular weight silicone or foamed
rubber.
[0051]
The spring member 41B shown in FIG. 8 (b) has a configuration order opposite to that of FIG. 8
(a), and a viscoelastic member 47 is coupled between two wires 46 made of piano wire or
polymer wire. It is The wire 46 has a straight shape, but may have a coil shape as shown in FIG. 8
(a).
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[0052]
The vibration characteristic of the damper 40 having such a structure will be described. As
shown in FIG. 7, the spring members 41 are linearly arranged along the four sides of the voice
coil bobbin mounting plate 42, and are elastically attached to each other independently. The
vibration in the Z-axis direction of the voice coil bobbin 8 is not accompanied by contraction or
extension in the circumferential direction as in the conventional waveform damper. Therefore,
the force-displacement characteristic is excellent in linearity, and the maximum amplitude of the
voice coil bobbin mounting plate 42 can also be increased. Furthermore, since the spring
member 41 is via the visco-elastic members 44 and 47 of FIG. 8, the resonance of the damper 40
itself can be suppressed. Further, as in the third embodiment, when the spring members 41 are
connected by the connecting member, the rigidity can be strengthened against the rolling of the
voice coil bobbin.
[0053]
Fifth Embodiment A loudspeaker according to a fifth embodiment of the present invention will be
described with reference to the drawings, focusing on the structure of the damper. FIG. 9 is a
perspective view showing a structure of a damper 50 used in the speaker 1D of the present
embodiment. The external shape of the damper 50 is the same as that shown in FIG. 1 except
that there is no voice coil bobbin mounting plate.
[0054]
The damper 50 of the present embodiment is obtained by bonding the mounting portion 21 a of
the spring member 20 of FIG. 1 directly to the outer peripheral surface of the voice coil bobbin 8.
As shown in FIG. 9, the mounting portion 21a of the spring member 20 and the other mounting
portion 21b are fixed to the voice coil bobbin 8 and the frame 2 at the same height.
[0055]
The vibration characteristic of the damper 50 having such a structure will be described. The
spring members 20 are radially arranged at equal intervals on the outer periphery of the voice
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coil bobbin 8, and are resiliently attached to each other independently. For this reason, when the
voice coil bobbin 8 vibrates in the Z-axis direction, contraction or extension in the circumferential
direction does not occur as in the conventional corrugation damper (waveform damper). As a
result, the force-displacement characteristic becomes excellent in linearity, and the vibration
amplitude of the voice coil bobbin 8 can also be increased.
[0056]
Further, the spring member 20 is bonded to the voice coil bobbin 8 without using the voice coil
bobbin mounting plate, and can be supported by at least three spring members 20 as illustrated,
so that the weight of the damper 50 can be reduced. Therefore, this damper 50 can be said to be
suitable for a smaller speaker as compared with the previous embodiment.
[0057]
Sixth Embodiment A loudspeaker according to a sixth embodiment of the present invention will
be described with reference to the drawings, focusing on the structure of the damper. FIG. 10 is a
perspective view showing a structure of a damper 60 used for the speaker 1E of the sixth
embodiment. The damper 60 has a large number of spring members 20 connected in a petaloid
shape between the ring-shaped voice coil bobbin mounting portion 61 and the frame mounting
portion 62. The spring members 20 are equally spaced along the circumference and curved in
the + Z axis direction. The voice coil bobbin mounting portion 61 is connected at the outer
peripheral surface of the voice coil bobbin 8, and the frame mounting portion 62 is fixed at the
mounting surface of the frame 2.
[0058]
The vibration characteristic of the damper 60 of the present embodiment will be described. The
spring members 20 are arranged in a petal shape along the outer periphery of the voice coil
bobbin 8 and are resiliently independent of each other. For this reason, when the voice coil
bobbin 8 vibrates in the Z-axis direction, contraction and extension in the circumferential
direction are not accompanied as in the conventional waveform damper. Therefore, the linearity
of the force-displacement characteristic is excellent, and the vibration amplitude of the voice coil
bobbin 8 can be increased. Further, since the voice coil bobbin mounting portion 61 and the
frame mounting portion 62 are integrated with the plurality of spring members 20, adhesion to
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the voice coil bobbin 8 and the frame 2 is facilitated.
[0059]
Seventh Embodiment A loudspeaker according to a seventh embodiment of the present invention
will be described with reference to the drawings, focusing on the structure of the damper. FIG. 11
is a perspective view showing a structure of a damper 70 used for the speaker 1F of the present
embodiment. In addition to the structure of the damper 60 of the sixth embodiment, the damper
70 is such that a connecting member 71 as shown in FIG. 12 is joined.
[0060]
The connection member 71 is a ring-shaped member in which a large number of arc-shaped
flexures having the same repetition interval as the arrangement pitch of the splash members 20
are formed. A connecting member 71 of such a shape is fixed on a large number of spring
members 20. The connecting member 71 is formed by molding a piano wire or a polymer wire
into a predetermined shape.
[0061]
In the damper 70 having such a structure, since the spring member 20 is fixed by the ringshaped connecting member 71, the spring member 20 does not deform in the circumferential
direction, and the voice coil bobbin 8 does not roll. Further, since the connecting member 71 has
an arc portion formed along the circumferential direction, expansion and contraction in the
circumferential direction are facilitated. For this reason, it is hard to restrict vibration amplitude
like a corrugation damper. Although one connecting member 71 is shown here, a plurality of the
connecting members 71 can form a damper more stable against rolling.
[0062]
In the damper shown in FIG. 10, all the voice coil bobbin mounting portions 61, the frame
mounting portions 62, and the spring members 20 may be integrally molded of a resin having
elasticity. Further, in the damper shown in FIG. 11, all of the voice coil bobbin mounting portions
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61, the frame mounting portions 62, the spring members 20, and the connecting members 71
may be integrally formed of a resin having elasticity.
[0063]
Eighth Embodiment Next, a loudspeaker according to an eighth embodiment of the present
invention will be described with reference to the drawings, focusing on the structure of a damper.
FIG. 13 is a perspective view showing a structure of a damper 80 used for the speaker 1G of the
present embodiment. The damper 80 is formed of a composite of a roll damper 81 and a
corrugation damper 82.
[0064]
In the roll damper 81, four roll-shaped structures 81a are formed on the outer peripheral portion
of a rectangular voice coil bobbin mounting portion 81d. A through hole 81c is provided in the
voice coil bobbin attachment portion 81d, and an arc-shaped attachment piece 81b is formed
outside the roll structure 81a.
[0065]
The corrugation damper 82 has the same structure as the damper shown in FIG. 16, the outer
peripheral portion 82a is fixed to the frame 2, the inner peripheral portion 82b is joined to the
mounting piece 81b of the roll damper 81, and supports the vibration system. It has become. The
roll structure 81a and the corrugation damper 81 are integrally molded or bonded together. As
the material, a polymer, a thin metal foil or the like is used.
[0066]
The vibration characteristic of the damper 80 having such a structure will be described. The rollshaped structures 81a of FIG. 13 are linearly arranged on the inner circumferential portion 82b
of the corrugation damper 82, and are elastically independent of one another. For this reason,
when the roll-shaped structure 81a is deformed, the material does not shrink or stretch in the
circumferential direction as in the conventional waveform damper.
12-04-2019
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[0067]
Ninth Embodiment A loudspeaker according to a ninth embodiment of the present invention will
now be described with reference to the drawings, focusing on the structure of the damper. FIG.
14 is a perspective view showing a structure of a damper 90 used for the speaker 1H of the
present embodiment. The damper 90 is formed of a composite of a corrugation damper 91 and a
linear damper 92.
[0068]
The corrugation damper 91 has the same structure as the damper shown in FIG. 16, the outer
peripheral portion 91 a is fixed to the frame 2, and the inner peripheral portion is connected to
the linear damper 92. The linear damper 92 is obtained by joining the spring member 20
according to the previous embodiment, the inner annular member 92a, and the outer annular
member 92b to one another. The inner annular member 92 a is fixed to the outer peripheral
portion of the voice coil bobbin 8 and is vibratably coupled to the outer annular member 92 b via
a plurality of spring members 20.
[0069]
In the damper 90 shown in FIG. 14, since the spring members 20 are arranged elastically and
independently of each other, the material shrinks in the circumferential direction like the
conventional wave damper when the voice coil bobbin 8 vibrates in the Z-axis direction. And
without stretching. Therefore, the linearity of the force-displacement characteristic is excellent,
and the vibration amplitude of the voice coil bobbin 8 can be increased.
[0070]
On the other hand, since the corrugation damper 82 or 91 disposed on the outside has a large
stiffness and its inner peripheral portion is replaced with a support structure having excellent
linearity, a relatively excellent structure remains. With such a configuration, in addition to the
characteristics of the roll structure having good linearity, the characteristics of the corrugation
12-04-2019
19
damper in which the force displacement characteristics change gradually are added. For this
reason, in the place where the force is small, vibration excellent in linearity can be obtained, and
a support system that brakes gently against an excessive input can be realized.
[0071]
As described above in detail, according to the first aspect of the present invention, since the
spring member is independent in the circumferential direction of the voice coil bobbin when the
diaphragm vibrates up and down, material in the circumferential direction can be obtained. There
is no need for stretching. Therefore, the spring member is easily deformed, the vibration
amplitude is large, and the linearity of the force displacement curve is excellent. Therefore, the
vibration amplitude of the diaphragm can be increased, and a small speaker with small distortion
can be realized even with a large input.
[0072]
Further, according to the second and third aspects of the invention, since the spring member is
connected by the connecting member along the outer periphery of the voice coil bobbin
mounting plate, the vibration perpendicular to the vibration direction of the voice coil is
prevented, and rolling is prevented. Can be made stronger. Therefore, it is possible to realize a
speaker that hardly generates an abnormal sound even with a large input.
[0073]
Further, according to the invention of claims 4 and 5, the spring structure is formed by
connecting the visco-elastic member and the elastic member which can be easily expanded and
contracted, and is independent in the circumferential direction of the voice coil bobbin at the
time of the vertical vibration of the diaphragm. It does not require material stretching in the
circumferential direction. Therefore, the elastic member is easily deformed, the vibration
amplitude is large, and the linearity of the force displacement curve is excellent. Furthermore, the
damping of the visco-elastic member can prevent the resonance of the damper. Therefore, a flat
speaker with frequency characteristics can be realized.
[0074]
12-04-2019
20
Further, according to the inventions of claims 6 to 8, the spring member is independent in the
circumferential direction of the voice coil bobbin at the time of the vertical vibration of the
diaphragm, so the material expansion and contraction in the circumferential direction is not
required. Therefore, the spring member is easily deformed, the vibration amplitude is large, and
the linearity of the force displacement curve is excellent. Therefore, the vibration amplitude of
the diaphragm can be increased, and a small speaker with small distortion can be realized even
with a large input.
[0075]
Further, according to the invention of claims 9 to 11, the spring member is connected by the
expandable connecting member disposed concentrically with the annular member, thereby
preventing the voice coil from being shaken in the lateral direction, and rolling. It can be made
stronger. Therefore, it is possible to realize a speaker that hardly generates an abnormal sound
even with a large input.
[0076]
Further, according to the inventions of claims 12 and 13, since the spring member is
independent in the circumferential direction of the voice coil bobbin when the diaphragm
vibrates up and down, material expansion and contraction in the circumferential direction are not
required. Therefore, the spring member is easily deformed, the vibration amplitude is large, and
the linearity of the force displacement curve is excellent. Furthermore, the corrugation damper
can increase the center retention force, resist rolling, and provide appropriate stiffness.
Therefore, the vibration amplitude of the diaphragm can be increased, and a small speaker with
small distortion can be realized even with a large input. In addition, it is possible to apply gentle
braking at the time of excessive input, and to realize a speaker that is not easily damaged.
[0077]
Further, according to the invention as claimed in claims 14 and 15, since the spring member is
composed of a piano wire or a polymer wire, the rigidity does not easily change even under high
temperature and high humidity without being affected by humidity, and the bass of the speaker
The characteristics can be stably maintained.
12-04-2019
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[0078]
Brief description of the drawings
[0079]
1 is a perspective view showing the structure of a spring member used in the damper of each
embodiment of the present invention.
[0080]
2 is a perspective view showing the structure of the main part of the speaker according to the
first embodiment of the present invention.
[0081]
3 is a half sectional view showing the structure of the speaker in the first embodiment.
[0082]
4 is a half sectional view showing a displacement state of the damper in the first embodiment.
[0083]
5 is a characteristic diagram of force versus displacement of the damper in the first embodiment.
[0084]
<Figure 6> It is the strabismus figure which shows the structure of the principal part of the
speaker in the form 3 of execution of this invention.
[0085]
7 is a perspective view showing the structure of the main part of the speaker in the fourth
embodiment of the present invention.
[0086]
Fig.8 (a) is a perspective view which shows the structure of the spring member (the 1) used for
the damper of Embodiment 4, (b) is a perspective view which shows the structure of a spring
member (the 2).
12-04-2019
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[0087]
<Figure 9> It is the strabismus figure which shows the structure of the principal part of the
speaker in the form 5 of execution of this invention.
[0088]
<Figure 10> It is the strabismus figure which shows the structure of the principal part of the
speaker in the form 6 of execution of this invention.
[0089]
<Figure 11> It is the strabismus figure which shows the structure of the principal part of the
speaker in the form 7 of execution of this invention.
[0090]
12 is a perspective view showing the structure of a connecting member used in the damper of
the seventh embodiment.
[0091]
<Figure 13> It is the strabismus figure which shows the structure of the principal part of the
speaker in the form 8 of execution of this invention.
[0092]
14 is a perspective view showing a structure of a main part of the speaker in the ninth
embodiment of the present invention. FIG.
[0093]
15 is a half sectional view showing a structural example of a conventional small speaker.
[0094]
16 is a perspective view showing the structure of a conventional speaker damper.
[0095]
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17 is a half sectional view showing a deformation state of the damper of the conventional
speaker.
[0096]
18 is a characteristic diagram of force versus displacement of the damper of the conventional
speaker.
[0097]
Explanation of sign
[0098]
1, 2A, 1B, 1C, 1D, 1F, 1G, 1H Speaker 2 frame 3 center pole 4 magnet 5 top plate 6 annular
magnetic circuit 7 air gap 8 voice coil bobbin 9 voice coil 11 diaphragm 12, 22, 30, 40 , 50, 60,
70, 80, 90 Damper 13 Edge 14 Speaker 20, 41A, 41B Spring member 21a, 21b Mounting
portion 24, 42, 84, 91 Voice coil bobbin mounting plate 23, 44, 81c Through hole 31a, 31b, 71
Connecting members 43a, 43b, 43c, 43d, 81b Mounting pieces 44, 47 Viscoelastic members 45
Coil springs 46 Wires 61, 81d Voice coil bobbin mounting portion 62 Frame mounting portion
81 Roll damper 82, 91 Corrugation damper 81a Roll structure 82a, 91a outer periphery 82b
inner periphery 9 Linear damper 92a in the annular member 92b outside the annular member
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