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JP2006041676

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DESCRIPTION JP2006041676
PROBLEM TO BE SOLVED: To provide a "speaker" having a damper shape capable of alleviating
the rolling phenomenon of a voice coil bobbin and reducing the driving load of a diaphragm in a
speaker having a plurality of dampers. SOLUTION: A plurality of dampers 3a and 3b provided
between a frame 1 and a diaphragm 2 are gradually approached as they reach the diaphragm 2
side, and installed with the same span, the bobbin 7. Increase the straightness to the vibration
direction of 7 and eliminate the rolling phenomenon, and reduce the load accompanying the
expansion and contraction of the dampers 3a and 3b to increase the sensitivity of the speaker,
and improve both the sound quality and the high output in the low frequency range. Can.
[Selected figure] Figure 1
スピーカー
[0001]
The present invention relates to a speaker in which a diaphragm is elastically supported by a
plurality of dampers, and more particularly to a speaker capable of stably supporting a
diaphragm by the damper and ensuring a large operating amplitude of the diaphragm.
[0002]
A typical speaker has a frame, a diaphragm, a damper, and a magnetic drive.
The magnetic drive unit is configured of a magnetic circuit unit having a magnet, a coil (voice
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coil), and a bobbin around which the coil is wound.
[0003]
The speaker described in Patent Document 1 below is provided with a conical (conical)
diaphragm having a hole in the center. The outer peripheral side of the diaphragm is supported
by the frame, and a position close to the center of the diaphragm is supported by a single
damper. The damper is annular, corrugated and stretchable. The inner peripheral side of the
damper is supported by a magnetic circuit portion provided on the frame side, and the outer
peripheral side of the damper is connected to the diaphragm so that the diaphragm can vibrate in
the sound generation direction.
[0004]
Further, a coil wound around a bobbin is provided at a central portion of the diaphragm, and the
magnetic circuit unit generates a magnetic field crossing the coil.
[0005]
In the speaker described in Patent Document 1, since the diaphragm is supported by a single
damper, it is likely to cause a rolling operation that is inclined with respect to the sound
generation direction.
When this rolling operation occurs, the bobbin as well as the diaphragm tilts, and the coil wound
around the bobbin contacts the magnetic circuit portion, which may generate an impact noise,
chatter noise, and the like.
[0006]
Therefore, in the speakers described in Patent Document 2 and Patent Document 3, the
diaphragm is supported by two dampers spaced in the direction of vibration.
[0007]
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In the speaker described in Patent Document 2, an outer peripheral portion of a cone-shaped
diaphragm is supported by a frame, and a bobbin having a coil is provided at a central portion of
the diaphragm.
The diaphragm is supported by a large diameter damper and a small diameter damper. The large
diameter damper has an outer periphery connected to the frame and an inner periphery
connected to the bobbin. The small-diameter damper is provided forward of the large-diameter
damper in the sound generation direction, and the small-diameter damper is connected to the
diaphragm at the outer peripheral side and to the yoke forming the magnetic circuit portion at
the inner peripheral side.
[0008]
In the speaker described in Patent Document 3, an outer peripheral portion of a cone-shaped
diaphragm is supported by a frame, and a bobbin is provided at a central portion. The speaker is
provided with two dampers of the same size, which are spaced apart in the sound generation
direction, and each damper is connected to the frame on the outer peripheral side and to the
bobbin on the inner peripheral side.
[0009]
As described in Patent Document 2 and Patent Document 3, when the diaphragm is supported by
two dampers arranged at intervals on the sound generation side, the diaphragm becomes easy to
operate linearly in the sound generation direction and rolling It becomes difficult to produce an
action. Japanese Utility Model Application Publication No. 48-47330 Japanese Utility Model
Application Publication No. 5-53397 Japanese Patent Application Publication No. 2002-300695
[0010]
However, the speaker described in Patent Document 2 has a small diameter damper located
forward on the sound generation side, so the amount of deformation of the damper itself is small,
so that the restraint force on the diaphragm becomes very large. Therefore, the operation
amplitude of the diaphragm can not be increased, and distortion of the sound is likely to occur
when the output is increased.
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[0011]
On the other hand, in the speaker described in Patent Document 3, the diameter dimensions of
the two dampers are the same and arranged in parallel with each other. In order to prevent the
rolling of the diaphragm, it is necessary to widen the distance between the dampers on each of
the inner and outer circumferential sides of the dampers, and the overall thickness dimension of
the speaker becomes large. Further, since the diaphragm is restrained by two parallel dampers, it
is difficult to operate the diaphragm with a large amplitude.
[0012]
The present invention is to solve the above-mentioned conventional problems, and it is an object
of the present invention to provide a speaker capable of alleviating the rolling phenomenon of
the diaphragm, reducing the restraint in the amplitude direction of the diaphragm, and further
reducing the thickness. There is.
[0013]
The present invention is a speaker having a frame, a diaphragm having an outer peripheral
portion supported by the frame, and a magnetic drive unit provided between the diaphragm and
the frame to drive the diaphragm. A plurality of dampers for vibratably supporting the
diaphragm is provided between the frame and the diaphragm, and a first connecting portion for
connecting the respective dampers and the frame side is the vibration. A second connecting
portion disposed at a predetermined interval in the vibration direction of the plate and
connecting each of the dampers and the diaphragm side is the first connecting portion in the
vibration direction of the diaphragm. It is characterized in that it is disposed at an interval
smaller than the interval.
[0014]
In the above configuration, the plurality of dampers are installed so as to approach each other as
they extend from the first connecting portion on the frame side to the second connecting portion
on the diaphragm side.
By arranging the first connection portion at an interval in the sound generation direction, the
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damper and the diaphragm become difficult to tilt, and the diaphragm becomes less likely to
cause a rolling operation.
Further, since both of the dampers extend obliquely, the restraining force against the vibration in
the sound generation direction of the diaphragm becomes weak, and distortion of sound at the
time of large output can be easily suppressed.
[0015]
In the present invention, preferably, each of the second connection portions is arranged without
leaving a space in the vibration direction.
[0016]
In the above-mentioned configuration, the diaphragm and the plurality of dampers are connected
at one place or a place close to each other.
As a result, the degree of freedom when the diaphragm vibrates is increased, and a large output
can be handled. In addition, it will be possible to thin the speaker.
[0017]
Still preferably, in each of the dampers, the support spans between the first connection portion
and the second connection portion are identical to each other.
[0018]
In the above configuration, the plurality of dampers are respectively connected to the diaphragm
with the same extension force, and the diaphragm is directed rearward when the amplitude
direction of the diaphragm is directed forward in the sound generation direction. At the same
time, the restraint force on the diaphragm becomes uniform.
Therefore, the vibration characteristics of the diaphragm can be made symmetrical.
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[0019]
Further, in the present invention, it is preferable that the second connecting portion be located
on the outer peripheral side and the first connecting portion be located on the inner peripheral
side.
[0020]
In this configuration, it is easy to ensure a long support span of the damper, and furthermore, it
is easy to make the entire speaker thin.
[0021]
In this case, the outer peripheral side of the diaphragm is supported by the frame via a
deformable outer peripheral support plate, and the second connecting portion is positioned on
the outer peripheral side of the diaphragm. Become.
[0022]
Further, the magnetic drive unit includes a coil supported by a bobbin fixed to the diaphragm,
and a magnetic circuit unit provided on the frame side to apply a magnetic field to the coil. The
connection portion can be configured as being located around the magnetic circuit portion.
[0023]
In the present invention, since the plurality of dampers provided between the frame and the
diaphragm are arranged so as to approach each other as they reach the diaphragm side, the
linearity of the diaphragm and the bobbin in the vibration direction Is easy to suppress the
rolling phenomenon.
Further, the restraint force on the diaphragm by the damper can be reduced, and distortion of
sound can be easily suppressed.
Furthermore, the entire speaker can be easily configured to be thin.
[0024]
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FIG. 1 is a cross-sectional view showing a speaker according to a first embodiment of the present
invention, and FIG. 2 is a partially enlarged cross-sectional view showing a speaker according to a
second embodiment of the present invention.
[0025]
The speaker shown in FIG. 1 mainly includes elements of a frame 1, a diaphragm 2, a magnetic
drive unit 6, and dampers 3a and 3b.
[0026]
The frame 1 is die-cast molded of a nonmagnetic metal material such as aluminum alloy or
injection molded of a synthetic resin.
The frame 1 has a cup-shaped storage portion 1A and a flange 1B located on the outer peripheral
edge of the storage portion 1A.
Mounting holes (not shown) for mounting to a mounting base material (not shown) such as a
baffle plate are formed in the flange 1B.
In FIG. 1, a center line extending in the front-rear direction (sound generation direction) of the
speaker is indicated by OO, and a support reference surface by the dampers 3a and 3b is
indicated by I-I.
The support reference surface I-I corresponds to a surface obtained by dividing the thickness in
the front-rear direction of the flange 1B of the frame 1 into two. The sound-production side
(upper side in FIG. 1) of the speaker is the front, and the opposite side is the rear, with the
support reference plane I-I as a boundary.
[0027]
A fixed portion 1a having a ring-shaped wall shape is integrally formed at a central portion inside
the storage portion 1A, and is positioned forward of the bottom surface 1e of the storage portion
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1A inside the fixed portion 1a. A central bottom 1d is formed. On the entire circumference of the
inner circumference of the flange 1B, there is formed a mounting surface 1b which is a ringshaped flat surface slightly behind the support reference surface I-I.
[0028]
The magnetic drive unit 6 is composed of a magnetic circuit unit disposed on the central bottom
1 d of the frame 1 and a coil (voice coil) 11. The magnetic circuit portion has a support yoke 5
made of a magnetic material having a concave cylindrical shape, a magnet 9 provided inside the
support yoke 5, and a yoke 4 made of a magnetic material provided on the magnet 9. A magnetic
gap is formed between the outer peripheral surface of the yoke 4 and the inner peripheral
surface of the support yoke 5.
[0029]
In the magnetic drive unit 6, the coil (voice coil) 11 is wound around a cylindrical bobbin 7 fixed
to a central portion of the diaphragm 2 on the movable side and extending rearward, and the
bobbin 7 and the coil 11 Are interposed in the magnetic gap between the yoke 4 and the support
yoke 5.
[0030]
The diaphragm 2 is formed of a resin, a paper material, or a paper material coated or
impregnated with a resin.
The diaphragm 2 has a cone shape with a central portion projecting forward, and in the space
formed on the rear side of the diaphragm (in the substantially conical space surrounded by the
diaphragm 2), the magnetic drive unit 6 At least a part of is arranged. The front end of the
bobbin 7 is fixed to the inner peripheral edge 2a of the hole formed in the center of the
diaphragm 2, and the opening of the front end of the bobbin 7 is closed with the cap 10 It is
done. An outer peripheral support plate 8 is bonded to the entire periphery of the outer
peripheral edge portion 2 b of the diaphragm 2. The outer peripheral support plate 8 is a thin
elastically deformable sheet material such as butyl rubber, and the cross section thereof is
formed in an arc shape. The outer peripheral edge portion of the outer peripheral support plate 8
is bonded and fixed to the mounting surface 1b formed on the flange 1B.
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[0031]
The dampers 3a and 3b are annularly formed of a cloth material impregnated with or coated
with a resin, or a thin resin plate or the like. The dampers 3a and 3b are corrugated, and the
concavo-convex portions repeating in the radial direction are formed concentrically, and can be
elastically flexed in the front-rear direction.
[0032]
The damper 3a and the damper 3b have the same inner diameter and the same outer diameter,
and are disposed so as to overlap in the front-rear direction. The inner peripheral edge portions
of the damper 3a and the damper 3b are individually adhered and fixed to the front end face and
the rear end face of the ring-shaped spacer 12 fixed on the fixing portion 1a in the first
connection portions 1c and 1c. It is done. The spacer 12 is formed of a nonmagnetic metal
material such as aluminum alloy or a synthetic resin material, and the inner peripheral edge
portion of one damper 3b is sandwiched between the rear end face and the fixing portion 1a, It
adheres and fixes to the upper surface of the said fixing | fixed part 1a. Alternatively, the inner
peripheral surface of the spacer 12 is adhesively fixed to the outer peripheral surface of the
support yoke 5.
[0033]
Further, the outer peripheral edge portions of the damper 3a and the damper 3b are connected
to the outer peripheral edge portion 2b of the diaphragm 2 by means of bonding or the like at
the second connecting portions 3c and 3c, respectively.
[0034]
The first connecting portions 1c, 1c are arranged at intervals in the sound-generating direction
(front-rear direction) by sandwiching the spacer 12.
As a result, the first connection portions 1c and 1c are located at equal distances in front of and
behind the support reference surface I-I.
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[0035]
Further, in the second connection portions 3c and 3c, the outer peripheral edge portions of the
damper 3a and the damper 3b are connected to the outer peripheral edge portion 2b of the
diaphragm 2 without leaving a space in the front-rear direction. . Alternatively, the outer
peripheral edge portions of the dampers 3a and 3b may be connected to the inner peripheral
edge portion of the outer peripheral support plate 8 in the second connection portions 3c and 3c.
[0036]
In this embodiment, the first connecting portions 1c and 1c are located on the inner peripheral
side, and the second connecting portion 2b is located on the outer peripheral side.
[0037]
When the diaphragm 2 and the bobbin 7 are in the neutral position of the vibration operation,
that is, when the center of the coil 11 in the front-rear direction coincides with the center of the
facing portion of the yoke 4 and the supporting yoke 5 Alternatively, when the vibration driving
force is not applied to the diaphragm 2, the positions of the second connection portions 3c and
3c respectively coincide with the support reference plane I-I.
That is, when the diaphragm 2 and the bobbin 7 are at the neutral position in the vibration
range, in the cross section of FIG. 1, the first connecting portions 1c and 1c and the second
connecting portions 3c and 3c are respectively isosceles triangles Located at the top of.
[0038]
When a current of an audio signal is applied to the coil 11, the bobbin 7 and the diaphragm 2
vibrate in the front-rear direction by this current and a magnetic field crossing the coil 11 at the
magnetic gap between the yoke 4 and the support yoke 5. Emits a sound.
[0039]
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The outer peripheral edge portion 2b of the diaphragm 2 is supported by two dampers 3a and 3b
at first connection portions 1c and 1c which are disposed at an interval in the front-rear
direction, and the first connection portion 1c. The diaphragm 2 vibrates back and forth so that
the shape in which the 1c and the 2nd connection part 3 are located in the vertex of a triangle is
maintained.
Therefore, it becomes difficult to move any direction on the circumference of the second
connecting portions 3c, 3c in the direction approaching and away from the center line OO. Since
the second connection portions 3c and 3c are constrained so as not to move in the horizontal
direction of FIG. 1, the diaphragm 2 is less likely to tilt relative to the center line O-O, and linearly
moves back and forth. It will be easier. Therefore, it is easy to suppress the rolling operation of
the diaphragm 2 and the bobbin 7.
[0040]
In addition, the second connection portions 3c, 3c are formed in an annular shape having a
predetermined radius from the center line OO, but in order for this second connection portion 3c
to be positioned at the outermost periphery of the diaphragm 2. , And the diameter of the second
connecting portions 3c, 3c can be increased. Therefore, even if the second connection portions
3c, 3c are slightly inclined with respect to the plane orthogonal to the center line OO, the tilt
angle of the diaphragm 2 with respect to the center line OO becomes small, It is easy to suppress
the rolling motion of the diaphragm 2.
[0041]
Furthermore, when the diaphragm 2 vibrates in the front-rear direction, the two dampers 3a, 3b
operate in a relationship in which one expands when the other contracts, and both dampers 3a,
3b operate in the front-rear direction of the diaphragm 2 It is hard to be restrained. Therefore,
distortion of the sound is less likely to occur when sounding with a relatively large output.
[0042]
Furthermore, the damper 3a and the damper 3b have the same dimensions, and their support
spans are also the same. Furthermore, when the diaphragm 2 is in the neutral position, the first
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connecting portions 1c and 1c and the second connecting portion 3c are located at the respective
apexes of the isosceles triangle. Therefore, if the distance from the support reference plane I-I is
the same when the diaphragm 2 moves forward and backward, the restraining force received
from the dampers 3a and 3b is the same. Therefore, the symmetry of the forward and backward
vibrations from the supporting reference surface I-I can be secured, and the sound quality can
always be improved.
[0043]
Further, in the loudspeaker of this embodiment, as shown in FIG. 1, the dampers 3a and 3b are
positioned in the space behind the diaphragm 2, so that the thickness dimension in the front-rear
direction can be minimized. In addition, since the rear of the diaphragm 2 is closed by the
dampers 3a and 3b, the sound pressure emitted rearward from the diaphragm 2 is difficult to be
transmitted toward the front of the diaphragm 2. Therefore, the sound pressure emitted to the
front of the diaphragm 2 can be prevented from being offset by the sound pressure emitted to
the rear, and the sound generation efficiency can be improved.
[0044]
Next, FIG. 2 is a partial cross-sectional view showing a speaker according to a second
embodiment of the present invention. In this speaker, second connection portions 3e, 3e
connecting the dampers 3a, 3b and the diaphragm 2 are disposed at an interval A in the frontrear direction. However, since the distance A is sufficiently smaller than the distance B between
the first connection portions 1c, 1c, the same effect as that of the first embodiment can be
obtained.
[0045]
Sectional drawing which shows the speaker of the 1st Embodiment of this invention. The
partially expanded sectional view which shows the speaker of the 2nd Embodiment of this
invention.
Explanation of sign
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[0046]
Reference Signs List 1 frame 1a fixing portion 1b mounting surface 1c first connection portion 2
diaphragm 3a, 3b damper 3c second connection portion 4 yoke 5 support yoke 6 magnetic drive
portion 7 bobbin 8 outer peripheral support plate 9 magnet 11 coil 12 spacer
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