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DESCRIPTION JP2000308173

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DESCRIPTION JP2000308173
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker provided with an enclosure and a speaker unit.
[0002]
2. Description of the Related Art Conventionally, even in a single-cone loudspeaker system using
one loudspeaker, dedicated speakers for bass and treble or bass, mid-tone and treble to
reproduce a wide range without difficulty. In multi-speaker systems such as two-way and threeway systems that use a combination of two or more speakers, a large-sized speaker unit with a
large aperture is mounted and used in a single enclosure to sufficiently reproduce bass. . As such
a speaker, it is common to attach a speaker unit for low frequency range, a speaker unit for mid
frequency range, and a speaker unit for high frequency range to a baffle plate of an enclosure,
and accommodate these speaker units in the enclosure.
[0003]
By the way, in the above-mentioned conventional loudspeaker, a signal in which the middle and
high tones are electrically cut by using a coil and a capacitor in advance is sent to the bass
speaker. At this time, not only the middle and high range is cut at the end, but also the electric
signal in the low range is deteriorated, so the original sound can not be faithfully reproduced.
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Furthermore, since the speaker unit is attached to the front baffle plate, the vibration of the
vibration part and the drive part of the diaphragm of the speaker unit is transmitted to the
enclosure through the frame of the speaker unit and the like, resulting in the vibration of the
enclosure. . Also, the air at the rear of the speaker unit is compressed by the vibration of the cone
of the speaker unit, and the air pressure presses the wall of the enclosure to vibrate, and this
vibration interferes with the vibration of the cone of the speaker unit. For this reason, the
acoustic characteristics of the enclosure affect the sound generation, which causes the
deterioration of the reproduction sound quality.
[0004]
In view of the above circumstances, it is an object of the present invention to provide a speaker
capable of obtaining high sound quality.
[0005]
A speaker according to claim 1 comprises an enclosure provided with a hole, and a speaker unit
comprising a cone-shaped cone and a drive provided at the center thereof. The hole has a larger
opening area on the front side than the opening area on the rear side of the enclosure, and the
speaker unit is positioned on the rear side of the enclosure so that the outer peripheral edge
faces the hole; A sound quality control means for suppressing high-pitched sound components is
provided at an opening on the front side of the enclosure of the unit.
[0006]
With this configuration, the speaker according to the present invention has the following effects.
That is, since the air layer intervenes in the hole between the cone portion and the sound quality
control means, it is difficult to transmit middle to high frequency range components, and the
sound quality control means provided in the opening causes vibration of the cone portion.
Among the generated vibrations, middle and high range components are cut.
Therefore, since it is not necessary to electrically cut middle and high tones using a capacitor and
a coil, it is possible to faithfully reproduce the original sound without changing the electric signal
for vibrating the cone portion. Therefore, a full range speaker unit can be used as the speaker
unit. Note that only the high range may be cut.
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[0007]
The speaker according to claim 2 is characterized in that in the speaker according to claim 1, the
sound quality control means is a plate material.
[0008]
In this speaker, since the plate material is provided at the opening of the hole, an air layer is
formed on the rear surface side of the plate material.
By the air layer being interposed, it becomes difficult to transmit middle-to-high range
components, and by increasing the mass of the plate, it is possible to restrict vibrations with a
large frequency and cut transmission of the middle-to-high range components. In addition, with
regard to the low frequency range component, the plate material on the front surface is vibrated
through the compression wave of the air layer, so that the air amount and the amplitude become
larger and the plate material is sent out to the front surface of the plate portion.
[0009]
The speaker according to claim 3 is characterized in that in the speaker according to claim 2, a
lead material is attached to the plate material.
[0010]
In this speaker, since the lead material is attached, the mass of the sound quality control means
becomes large, and medium and high sound can be cut more efficiently.
[0011]
According to a fourth aspect of the present invention, in the speaker according to any one of the
first to third aspects, the opening area on the rear side of the enclosure of the hole is formed
smaller than the outer diameter of the speaker unit. It features.
[0012]
Furthermore, in the loudspeaker according to any one of claims 1 to 4, in the loudspeaker
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according to any one of claims 1 to 4, a diaphragm for a flat speaker is provided in the enclosure
separately from the hole, and the diaphragm for a flat speaker Is provided with a number of ribs
that hold air containing sound waves and send them out to the front of the diaphragm, and open
the rear side of the enclosure, and have a diaphragm drive mechanism that vibrates the
diaphragm. It is characterized by
A speaker according to claim 6 is characterized in that, in the speaker according to any one of
claims 1 to 5, the speaker unit is supported by a frame fixed to an enclosure.
[0013]
In this speaker, a bass component is emitted from the hole, and a middle and high tone
component is generated from the diaphragm.
Since the flat speaker diaphragm is provided with a large number of ribs located on the front
surface of the diaphragm, after the vibration of the diaphragm drive mechanism is transmitted to
the diaphragm, air that has a sound wave on the front surface of the diaphragm by this rib Hold
and send forward reliably.
Therefore, the sound wave is prevented from being scattered around the diaphragm 4 and
rotating to the rear of the diaphragm. Moreover, since the rear side of the enclosure is open,
resonance between the diaphragm and the enclosure is prevented, and interference between the
enclosure and the back pressure of the diaphragm is prevented. Moreover, in this speaker, the
speaker unit is supported by the frame unlike the conventional case where it is supported by a
baffle plate or the like on the front surface. Therefore, the vibration of the speaker unit is not
transmitted to the enclosure and the enclosure does not resonate.
[0014]
The speaker according to claim 7 is characterized in that, in the speaker according to any one of
claims 1 to 6, sound absorbing means for absorbing the sound generated from the rear surface of
the speaker is provided on the rear surface side of the speaker. Do.
[0015]
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As described above, with regard to the sound emitted from the front surface of the speaker unit,
the mid-high range sound component can be cut by the sound quality control means, but there
may be a case where the uncut sound is generated from the rear surface of the speaker.
Therefore, by providing the sound absorption means as described above, the sound generated
from the rear face of the speaker is absorbed.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention
will be described with reference to the drawings. What is shown in FIG. 5 is a speaker unit used
for a speaker according to the present embodiment, FIG. 6 is a cross-sectional view of the
speaker unit, and FIG. 2 is a speaker to which the speaker unit is attached. As shown in FIG. 2,
the speaker 1 according to the present embodiment includes a hollow frame (enclosure) 2, a
diaphragm 3, and a frame 4. The hollow frame 2 is a cylinder having a rectangular cross section
and formed in a rectangular frame shape, and the inside thereof is densely filled with baked sand
dried by burning sand. At the rear of the hollow frame 2, a frame 4 is disposed apart from the
hollow frame 2. The hollow frame 2 and the lower end of the frame 4 are provided with an
inverted conical protrusion 10, and the protrusion 10 is adapted to support the speaker 1.
[0017]
The diaphragm 3 is positioned inward of the hollow frame 2 and in parallel with the hollow
frame 2. The diaphragm 3 is fixed to the curved plate 15 and the curved plate 15 as shown in
FIG. And a rib 16 for retaining the air containing the air and delivering it to the front surface of
the diaphragm 3. An elastic connection member is provided on the outer periphery of the
diaphragm 3, and the diaphragm 3 is attached to the hollow frame 2 in a non-contact manner by
interposing the connection member. As the connecting member, for example, a material that is
rich in elasticity and has good vibration damping properties is applied, such as a urethane foam
resin. The present invention is not limited to this, and may be suspended by a resin yarn so that
only movement in the back and forth direction is permitted without contact with the hollow
frame and movement in the other direction is blocked. In this case, the diaphragms 3 are
attached to the other ends of the yarns each having one end attached near the four corners of the
hollow frame 2.
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[0018]
The curved plate 15 is curved such that both side portions form a part of a substantially
cylindrical (elliptical cylinder) surface, and the central portion has a substantially planar shape
and has a plate shape curved in one direction as a whole. In the vicinity of the center of the
curved plate 15, two holes 17 are formed vertically. Further, at upper and lower ends and at the
center of the curved plate 15, lateral ribs 16a having a plane shape substantially equal to the
cross-sectional shape orthogonal to the axis of the curved plate 15 are fixed. In the vicinity of the
central axis of the curved plate 15, a longitudinal rib 16 b directed to a direction orthogonal to
the transverse rib 16 a is fixed to the curved plate 15. Further, radial ribs 16c are fixed to the
curved plate 15 between the horizontal ribs 16a and on the left and right of the vertical ribs 16b.
Each of the ribs 16 composed of the ribs 16a to 16c is tapered in cross section in which the
diaphragm side plate thickness is larger than the tip side plate thickness.
[0019]
It is desirable that the curved plate 15 and the rib 16 be light in weight and high in rigidity. In
the present embodiment, a balsa material is applied. Also, all these members are combined by
being skived so that the direction of the fibers is in the longitudinal direction of the members.
Furthermore, in the present embodiment, the curved plate 15 is formed into the illustrated shape
by elastically deforming a flat plate, and each rib 16 is maintained so as to maintain this
elastically deformed state (state in which the internal stress is generated). Is fixed to the curved
plate 15. By generating the internal stress in this manner, the vibration propagation speed can be
increased.
[0020]
On the rear surface of the diaphragm 3, as shown in FIG. 4, three cone type speaker units
(diaphragm drive mechanism) 18, 18, 19 are positioned vertically adjacent to each other. Each of
these is a full range speaker unit, the upper two 18 and 18 are speaker units for middle and
high-pitched sound, and the lower 19 is a speaker unit for bass. The speaker units 18, 18, 19 are
fixed to a frame 4 disposed behind the hollow frame 2. A speaker holding member 21 is provided
between the frames 4, and a hole 22 is formed in the speaker holding member 21 with its
opening portion directed in the front-rear direction. The rear portions of the speaker units 18 to
19 are fitted and fixed to the holes 22.
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[0021]
As shown in FIG. 1, the bass speaker unit 19 is located on the rear surface of the plate 29 that
constitutes a part of the enclosure. The speaker unit 19 includes a cone-shaped cone 31, a drive
32 provided at the center thereof, and a frame 30 extending from the drive and supporting the
cone 31. A hole 34 is provided in the plate 29. The speaker unit 19 is attached to the frame 4
with the cone portion 31 desired in the hole 34.
[0022]
The frame 30 supports the cone portion 31 from the back, the base end side of the frame 30 is
fixed to the drive portion 32, and the cone portion 31 is fixed to the outer peripheral end side so
as to be able to vibrate. A sound absorbing rubber 33 is provided on the rear surface side of the
cone portion 31 as a sound absorbing means for absorbing the sound emitted from the cone
portion 31 to the rear. The sound absorbing rubber 33 is bonded to the inside of the frame 30 so
as to cover the entire rear surface side of the cone portion 31 in a state of being separated from
the cone portion 31. However, when the cone portion 31 is completely sealed, a resistance is
exerted when the cone portion 31 vibrates, so a part is opened.
[0023]
The hole 34 is formed such that the opening area on the front side is larger than the opening
area on the rear face side of the hollow frame 2, and the speaker unit 19 faces the hole 34 at the
outer peripheral edge on the back side of the plate member 29. A plate member 36 is provided at
the opening of the plate member 29 on the front surface side 34a of the hole portion 34 as a
sound quality control means for suppressing a high sound component. On the rear side of the
plate 36, a lead material having a thickness of 0.3 mm is attached in order to increase the mass
of the plate. The thickness of the plate material is 2 mm including the lead material, and the air
layer 37 formed on the hole front side 34a is 3 mm. The hole 34 provided in the plate member
36 has a circular shape on the rear side 34b of the hole and a rectangular shape on the front side
34a, which is larger than the opening area of the rear side 34b. The opening area is larger than
the rear side 34 b of the hole 34 and smaller than the front side 34 a.
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[0024]
Further, the external appearance of the middle to high-tone speaker unit 18 is shown in FIG. The
speaker unit 18 is a general cone-type speaker unit provided with a cylinder 25. Specifically, the
speaker unit 18 includes a drive unit 26 provided in the center, and a cone-shaped cone unit 27
provided on the outer peripheral side of the drive unit 26 and vibrated by the drive unit 26. A
cylindrical body 25 is bonded to an intermediate position between the inner peripheral edge and
the outer peripheral edge of the cone portion 27. Since the cylindrical body 25 causes resonance
when it is cylindrical and the sound quality is degraded, the outer peripheral end side is formed
larger in diameter than the cone portion 27 side.
[0025]
As described above, the speaker unit 18 is fixed to the frame 4. Specifically, the speaker unit 18
is fixed to the frame 4 with the outer peripheral edge of the cone portion 27 facing the
diaphragm 3 side. The side is bonded to the diaphragm 3 so as to face the hole 17 provided in
the diaphragm 3. That is, in the cone portion 27, the vibration generated at the inner side of the
portion to which the cylindrical body 25 is adhered passes through the hole 17 via air and is
transmitted to the front of the diaphragm 3. It is done. Further, the vibration of the cone portion
27 is transmitted to the diaphragm 3 through the cylinder 25. The lid 28 is provided in one of
the holes 17 provided in the diaphragm 3 for the purpose of adjusting the sound quality of the
high-tone component.
[0026]
Next, the operation of the speaker 1 configured as described above will be described. First, the
speaker unit 19 will be described. When the output signal of the amplifier is input to the speaker
unit 19, the cone portion 31 of the speaker unit 19 vibrates, passes through the hole 34, and the
sound wave is pushed out to the front. At this time, since the opening area of the hole 34 is
formed larger on the front side 34 a, the vibration passing through the hole on the rear side 34 b
is transmitted to the air layer 37 formed on the front side 34 a. At this time, the air layer 37 and
the plate member 36 having a large mass restrict transmission of vibrations in the middle to high
frequency range having a large frequency. That is, the air layer 37 and the plate member 36
function as a mechanical impedance, so that the middle to high range is cut and only the low
range is transmitted to the plate 36. The vibration in the low-pitched range vibrates the plate
member 36 via the compressional waves of the air layer 37, so that a larger amount of air and a
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greater amplitude are sent out to the front of the plate portion 36. Therefore, since it is not
necessary to electrically cut middle and high tones using a capacitor and a coil, it is not necessary
to change an electric signal for vibrating a cone part, and it is possible to faithfully reproduce an
original sound.
[0027]
Furthermore, since the rear of the speaker is open, the conventional resonance between the
diaphragm and the enclosure does not occur, and the interference between the enclosure and the
back pressure of the diaphragm is prevented. Further, in this speaker, the speaker unit 19 is
supported by the frame 4 unlike the conventional case where the speaker unit 19 is supported
by a baffle plate or the like on its front surface. Therefore, the vibration of the speaker unit is not
transmitted to the enclosure and the enclosure does not resonate.
[0028]
Next, the speaker unit 18 will be described. Similar to the speaker unit 19, when the output
signal of the amplifier is input to the speaker unit 18, the cone portion 27 vibrates. As a result, a
sound wave of a high frequency range is generated from the central portion of the cone portion
27 and is transmitted to the front of the diaphragm 3 through the hole portion 17 through the
air. Further, the vibration of the cone portion 27 is transmitted to the cylinder 25. As described
above, since the cylindrical body 25 is bonded at the middle between the inner peripheral edge
portion and the outer peripheral edge portion of the cone portion 27, the vibration energy
transmitted to the outer peripheral edge portion of the cone portion is transmitted to the
cylindrical body side.
[0029]
The vibration transmitted to the cylindrical body 25 is further transmitted to the diaphragm 3. As
described above, a large number of ribs 16 are provided on the front surface of the diaphragm 3,
and the front left and right edges of the diaphragm 3 are curved toward the front surface of the
diaphragm 3. Air is held by these ribs 16 and pushed forward of the diaphragm 3. That is, the
sound wave is prevented from being scattered to the top, bottom, left, and right of the diaphragm
3 and being turned to the rear surface side of the diaphragm 3. Further, since the diaphragm 3 is
not in contact with the hollow frame 2, the response to the input signal is very good, and the
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vibration of the diaphragm 3 is hardly transmitted to the hollow frame 2. Moreover, since the
inside of the hollow frame 2 is filled with baked sand, it is converted to thermal energy even if
the vibration of the vibrating plate 3 or other things is transmitted, so the vibration of the
vibrating plate 3 or other things and the hollow frame Resonance with 2 is reliably prevented.
Therefore, the acoustic characteristics of the enclosure do not greatly affect the sound generation
as in the prior art, and a pure sound can be heard directly, so a very clear high-quality sound can
be obtained.
[0030]
Further, since the high tone range is directly pronounced from the holes 17, the localization of
the pronunciation is good, and a natural sound field feeling can be obtained. In addition, the
presence of the cylindrical body 25 and the diaphragm 3 also prevents the sound wave from
rotating to the rear of the speaker unit 18. This is also a factor that can obtain high sound
quality. Furthermore, only the frame 4 is attached to the rear of the diaphragm 3 and it is in an
open state. Therefore, interference between the hollow frame 2 and the back pressure of the
diaphragm 3 can be reliably prevented.
[0031]
The present invention is not limited to the above embodiment, and the following modifications
may be made. The shape of the curved plate 15 is not limited to the above, and a shape in which
the shape of the cross section (cross section perpendicular to the axis) forms a part of a perfect
circular or elliptical arc or a combination of arcs of different curvatures Various shapes such as a
shape or a polygonal shape can be adopted. In addition to curving the left and right edges of the
curved plate 15, the upper and lower edges may be curved. The material of the diaphragm 3 is
not limited to the wood as described above, and may be a plastic material such as polycarbonate
as well as a material (such as pulp) applied to a conventional speaker. The curved plate 15 does
not necessarily have to be in an elastically deformed state (a state in which an internal stress is
generated), and may be in a curved state as illustrated by plastic deformation by heat treatment
or the like.
[0032]
As described above, according to the present invention, the vibration of the speaker unit is
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transmitted through the air layer and the sound quality control means, but at this time the
transmission of the vibration in the middle to high frequency range having a large frequency is It
is regulated. That is, since the air layer and the sound quality control means work as a
mechanical impedance, so to speak, the middle and high range is cut. Further, since the lowpitched sound area is transmitted to the sound quality control means having a large area via the
compression wave of the air layer, the air amount and the amplitude become larger and are sent
out to the front of the sound quality control means. Therefore, since it is not necessary to
electrically cut middle and high tones using a capacitor and a coil, it is not necessary to change
an electric signal for vibrating a cone part, and it is possible to faithfully reproduce an original
sound. In addition, the rear of the speaker unit is open. Therefore, the interference between the
enclosure and the back pressure of the cone portion can be reliably prevented. From the above,
in the speaker according to the present invention, high sound quality can be obtained.
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