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DESCRIPTION JP2006222989

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DESCRIPTION JP2006222989
The present invention provides a speaker device capable of preventing a decrease in support
performance due to mechanical fatigue of a damper during long-term use, and generation of a
unique vibration or rubbing noise due to a deformation of the damper. SOLUTION: The first
diaphragm 41 and a second diaphragm 42 coaxially arranged along the driving direction are
provided, and the outer peripheral portions 61, 62 of the first diaphragm 41 and the second
diaphragm 42 are The first diaphragm 41 is fixed to the diaphragm support portions 35c and
35d on the frame 35, and the first diaphragm 41 is joined to the second diaphragm 42 at the
joint portion, and the inner peripheral portion of the second diaphragm 42 42 b is fixed to the
voice coil bobbin 45, and a dust cap 23 is attached near the joint. [Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
FIG. 1 shows the configuration of a conventional general electrodynamic speaker device.
The speaker device 1 includes a magnetic circuit 3, a frame 5 to which the magnetic circuit 3 is
attached at the rear, and a cone having a roll-shaped outer peripheral edge 7 fixed to the
diaphragm support 5a at the front of the frame 5. And a voice coil 12 wound around a cylindrical
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voice coil bobbin 11.
[0003]
The magnetic circuit 3 comprises a yoke 15 having a structure in which a cylindrical center pole
15b protrudes from the center of a disk-shaped plate 15a, a ring-shaped magnet 16 loosely fitted
on the outer periphery of the center pole 15b, and a plate 15a. And a ring-shaped top plate 17
loosely fitted on the tip end side of the center pole 15b so as to sandwich the magnet 16
therebetween. A gap between the inner periphery of the top plate 17 and the center pole 15 b is
a magnetic gap 19 in which the voice coil 12 is disposed.
[0004]
The diaphragm 9 has an opening 9 a at the center, through which the voice coil bobbin 11 is
inserted. The edge 7 joined to the outer peripheral edge of the diaphragm 9 has a ring-shaped
gasket 21 and the diaphragm support 5a with the attachment flange 7a mounted on the outer
periphery of the edge 7 attached to the diaphragm support 5a. And fixed to the diaphragm
support 5a. Further, the inner peripheral portion 9b of the diaphragm 9 forming the opening 9a
is fixed to the outer periphery of the voice coil bobbin 11 inserted in the opening 9a by adhesion
or the like. Further, a dust cap 23 is attached to a central portion of such a diaphragm 9. The
dust cap 23 covers the front of the voice coil bobbin 11 to prevent dust and the like from
entering the magnetic gap 19.
[0005]
The cylindrical voice coil bobbin 11 is loosely fitted on the outer periphery of the center pole
15b so as to be movable in the axial direction, and is elastically supported by the frame 5 via the
damper 25 so as to restrict axial movement. Usually, as the damper 25, one in which a bellows
structure is formed concentrically with the voice coil bobbin 11 is in widespread use (see, for
example, Patent Document 1 and Patent Document 2). The outer peripheral edge of the damper
25 is fixed to the damper support portion 5b of the frame 5, and the inner peripheral portion is
fixed to the outer periphery of the voice coil bobbin 11, thereby restricting the radial
displacement of the voice coil bobbin 11 and the diaphragm At the time of driving 9, vibration
energy is absorbed by deformation of the bellows and vibration of the diaphragm 9 is controlled.
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[0006]
In addition, normally, the frame 5 has a structure in which an opening 5c is appropriately
provided between the diaphragm support 5a and the damper support 5b. The opening 5c
functions as a vent for releasing the back pressure when the diaphragm 9 is driven, and at the
same time contributes to weight reduction of the frame.
[0007]
The above speaker device 1 vibrates the diaphragm 9 by the reciprocating vibration of the voice
coil bobbin 11 when the acoustic signal is inputted to the voice coil 12 through the input
terminal and the tinsel wire not shown, thereby reproducing the sound. do. Japanese Patent
Application Laid-Open No. 63-155900 Japanese Patent Application Laid-Open No. 11-262085
[0008]
Since the damper 25 in the conventional speaker device 1 usually has higher stiffness than the
edge 7, mechanical fatigue due to long-term use may occur earlier than the edge 7, and a
decrease in control performance may cause a failure. Further, deformation of the bellows during
vibration propagation between the adjacent bellows on the damper 25 generates peculiar
vibration or rubbing sound, which in turn affects the vibration of the voice coil 12 and the
diaphragm 9 to improve the sound quality. There was also the possibility of becoming muddy.
[0009]
Problems to be solved by the present invention include a problem that a decrease in support
performance due to mechanical fatigue of the damper causes a failure in long-term use, which
occurs in the above-mentioned prior art, and a unique vibration or rubbing noise due to the
deformation of the damper. The problems that occur are listed as an example.
[0010]
The speaker device according to claim 1 includes a first diaphragm and a second diaphragm
coaxially arranged along the driving direction, and outer peripheral portions of the first
diaphragm and the second diaphragm are An inner peripheral portion of the first or second
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diaphragm while being fixed to a diaphragm supporting portion on a frame and the first
diaphragm and the second diaphragm are joined at a joint portion; Is fixed to the voice coil
bobbin, and a dust cap is attached in the vicinity of the joint.
[0011]
A speaker device according to a fourth aspect of the present invention includes a first diaphragm
and a second diaphragm coaxially arranged along the driving direction, and an outer periphery of
the first diaphragm and the second diaphragm. The part is fixed to the diaphragm support on the
frame, and the inner circumferences of the first diaphragm and the second diaphragm are fixed
to the voice coil bobbin, and a dust cap is attached near the junction It is characterized by being
[0012]
Hereinafter, an embodiment of a speaker device according to the present invention will be
described in detail with reference to the drawings.
[0013]
First Embodiment FIG. 2 is a longitudinal sectional view of a first embodiment of a speaker device
according to the present invention, and FIG. 3 is an operation explanatory diagram when driving
the speaker device shown in FIG. .
As shown in FIG. 2, the speaker device 30 according to the first embodiment includes a magnetic
circuit 33, a frame 35 to which the magnetic circuit 33 is attached at the rear, and a first one
disposed coaxially in the driving direction. And a voice coil 46 wound around a cylindrical voice
coil bobbin 45.
Reference numeral 37 denotes a center line of the speaker device 30.
[0014]
The magnetic circuit 33 includes a yoke 51 having a structure in which a cylindrical center pole
51b protrudes from the center of a disk-shaped plate 51a, a ring magnet 53 loosely fitted on the
outer periphery of the center pole 51b, and a plate 51a. And a ring-shaped top plate 55 loosely
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fitted on the tip end side of the center pole 51b so as to sandwich the magnet 53 between them.
A gap between the inner periphery of the top plate 55 and the center pole 51 b is a magnetic gap
57 in which the voice coil 46 is disposed.
[0015]
The magnetic circuit 33 is attached to the inner surface of the bottom plate portion 35a with the
plate 51a of the yoke 51 placed thereon.
The frame support portion 35c of the first diaphragm 41 and the diaphragm support portion 35d
of the second diaphragm 42 are respectively mounted on the frame 35 at positions separated
along the driving direction. The peripheral wall 35b between the two diaphragm support
portions 35c and 35d is a sealing wall provided with no opening, but the back pressure of the
diaphragm is released between the diaphragm support portion 35d and the bottom plate portion
35a. An opening 35 f as a pore is appropriately provided. The back surface of the diaphragm
support 35c of the frame 35 functions as a flange surface closely fixed to the baffle 71 of the
speaker cabinet.
[0016]
The first diaphragm 41 and the second diaphragm 42 are cone-shaped diaphragms, and the
edges 61 and 62 which are the outer peripheral portions thereof are fixed to the diaphragm
support portions 35 c and 35 d on the frame 35. The inner peripheral portions 41 b and 42 b are
joined and fixed to the voice coil bobbin 45. The edges 61 and 62 are preferably made of a
material having a high internal loss in order to attenuate the vibration transmitted from the cone
paper which is the diaphragm main body. Therefore, for example, it is preferable to join members
made of materials different from corn paper (materials having a higher internal loss than corn
paper) to form the edges 61 and 62.
[0017]
The diameter of the opening at the central portion of the first diaphragm 41 disposed on the
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front side of the speaker device is set larger than the diameter of the aperture of the second
diaphragm 42 disposed on the front side of the speaker device. The edge 61 is provided with a
bulging portion 61 a that bulges to the outside (the front side of the speaker device) of the sealed
space 67 between the diaphragms. Further, the diameter of the opening of the central portion of
the second diaphragm 42 disposed behind the first diaphragm 41 is set to be substantially equal
to the outer diameter of the voice coil bobbin 45, and the edge 62 is between diaphragms The
bulging part 62a which swells to the outer side (back side of a speaker apparatus) of the sealed
space 67 is provided. The direction of the unevenness of the bulging portion 61a and the bulging
portion 62a is not limited to the direction of FIG.
[0018]
The edges 61 and 62 of the first diaphragm 41 and the second diaphragm 42 described above
are respectively fixed to the two diaphragm support portions 35c and 35d of the frame 35
described above. The mounting flange 61b connected to the outer peripheral portion of the edge
61 of the first diaphragm 41 is held by the gasket 65 and the diaphragm support 35c and fixed
to the diaphragm support 35c. There is.
[0019]
Further, the inner peripheral portion 41b of the first diaphragm 41 is joined to the second
diaphragm 42 in a state of being superimposed on the second diaphragm 42 located behind it.
Further, a dust cap 23 is attached to a central portion of the first diaphragm 41. The dust cap 23
covers the front of the voice coil bobbin 45 to prevent dust and the like from entering the
magnetic gap 57.
[0020]
Then, the inner circumferential portion 42b of the second diaphragm 42 is appropriately
adhered and fixed to the outer periphery of the voice coil bobbin 45 with an adhesive, whereby
the inner circumferential portion 41b of the first diaphragm 41 and the second diaphragm 42,
42b is joined and the structure fixed to the voice coil bobbin 45 is obtained.
[0021]
The cylindrical voice coil bobbin 45 is movably fitted in the axial direction and loosely fitted on
the outer periphery of the center pole 51b, and positioning in the radial and axial directions is
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achieved by the second diaphragm 42 joined to the outer periphery. ing.
[0022]
In the case of the present embodiment, a space 67 between the diaphragms surrounded by the
first diaphragm 41 and the second diaphragm 42 and the frame 35 is sealed.
When the first diaphragm 41 and the second diaphragm 42 are driven by the axial displacement
of the voice coil bobbin 45, as shown in FIG. 3, a gas such as air enclosed in a closed space 67
between the diaphragms Is compressed by the displacement of the first diaphragm 41 and the
second diaphragm 42 and the displacement of the edges 61a and 62a, and the spring property
as an air spring is exhibited.
In the present embodiment, when the effective area of the first diaphragm is S1 and the effective
area of the second diaphragm is S2, the difference S between the effective areas is S = S1-S2, and
between the diaphragms. Assuming that the volume V of air in the closed space 67, the stiffness,
which is a constant representing the spring property of the above-mentioned air spring, can be
made proportional to S / V. That is, in the present embodiment, the voice coil bobbin 45 is
controllably supported by the spring property as the air spring provided in the closed space 67
between the diaphragms.
[0023]
In the speaker device 30 according to the present embodiment described above, the spring
property as the air spring of the closed space 67 between the diaphragms absorbs the vibrational
energy of the voice coil bobbin 45 and the diaphragms 41 and 42. And, in order to control the
diaphragm, it is not necessary to provide a control damper as provided in the conventional
speaker device. That is, in the speaker device 30 of the present embodiment, the first diaphragm
41 and the second diaphragm 42 themselves also serve as dampers for controlling the vibration
of the diaphragm and the voice coil bobbin 45.
[0024]
Moreover, the second diaphragm 42 coaxially mounted behind the first diaphragm 41 to realize
the sealed space 67 between the sealed diaphragms is made of the same material as the first
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diaphragm 41. As compared with the conventional damper having a bellows structure,
mechanical fatigue is less likely to occur, so that it is possible to prevent the deterioration of the
vibration control performance caused by the mechanical fatigue of the component parts, and to
realize the long life of the speaker device.
[0025]
Furthermore, unlike the case of the conventional bellows-type damper in which deformation
moves between adjacent bellows (relief parts) at the time of vibration propagation, the first
diaphragm 41 and the second diaphragm 42 are locally greatly deformed As a result, there is no
generation of a specific vibration or rubbing noise that causes the sound quality to become
turbid, and it is possible to realize high-quality sound reproduction without turbulation.
[0026]
Then, in the speaker device 30 according to the present embodiment, the edges 61 and 62 of the
diaphragms 41 and 42 become resistant to deformation due to back pressure by the aid of the
pressure of the gas in the sealed space 67 between the sealed diaphragms.
Further, since the second diaphragm 42 and its edge 62 bear the back pressure, the burden of
the back pressure applied to the first diaphragm 41 that performs acoustic reproduction can be
reduced, and the reproduction sound quality can be improved.
[0027]
Second Embodiment FIG. 4 is a longitudinal sectional view of an essential part of a second
embodiment of the speaker device according to the present invention.
The speaker device 40 according to the second embodiment is the same as the speaker device 30
according to the first embodiment shown in FIGS. 2 and 3, as shown in FIG. The second
diaphragm 42 is connected by a rib 81 (connection member). The ribs 81 are appropriately
provided at a plurality of places at predetermined intervals.
[0028]
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By the connection by the ribs 81, the rigidity of the first diaphragm 41 and the second
diaphragm 42 forming the sealed space 67 between the diaphragms is strengthened, and the
propagation speed of the acoustic vibration is improved. Sound quality can be reproduced. Also,
by the connection of the first diaphragm 41 and the second diaphragm 42 by the ribs 81, the
vibration energy is rapidly dispersed in a wide range of each diaphragm 41, 42 to suppress local
distortion of the diaphragm. The burden on vibration energy to be absorbed can be reduced, and
the fatigue resistance of the diaphragms 41 and 42 can be improved.
[0029]
In the first and second embodiments described above, the inner diameter of the second
diaphragm 42 positioned on the rear side of the first diaphragm 41 positioned on the front side
is made smaller. The inner peripheral portion of the diaphragm 42 was joined to the voice coil
bobbin 45. However, conversely, the inner diameter of the first diaphragm 41 is made smaller
than that of the second diaphragm 42, and the inner peripheral portion of the second diaphragm
42 is integrally joined to the middle portion of the first diaphragm 41. Alternatively, the inner
peripheral portion of the first diaphragm 41 may be bonded to the voice coil bobbin 45.
[0030]
Furthermore, it is also considered that the inner diameters of the first diaphragm 41 and the
second diaphragm 42 are made equal to the outer diameter of the voice coil bobbin 45, and the
inner peripheral portion of each diaphragm is directly joined to the voice coil bobbin 45. Be
[0031]
As described above in detail, the speaker devices 30 and 40 according to the first and second
embodiments include the first diaphragm 41 and the second diaphragm 42 coaxially arranged
along the driving direction. The outer peripheral portions 61 and 62 of the first diaphragm 41
and the second diaphragm 42 are fixed to the diaphragm support portions 35c and 35d on the
frame 35, and the first diaphragm 41 and the second diaphragm The inner peripheral portions
41a and 42a of the diaphragm 42 are joined and fixed to the voice coil bobbin 45, and the space
67 surrounded by the first diaphragm 41 and the second diaphragm 42 and the frame 35 is
sealed and sealed. The voice coil bobbin 45 is supported by the elasticity of the gas in the space
67.
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[0032]
As a result, the spring characteristics of the air-tight space 67 between the diaphragms 41 and
42 as the air spring controls the vibration of the voice coil bobbin 45 and the diaphragms 41 and
42, and there is no need to provide a dedicated damper for control.
[0033]
Further, since the second diaphragm 42 can be made of the same material as the first diaphragm
41, its mass is small and mechanical fatigue is less likely to occur as compared with the
conventional bellows-type damper. It is possible to realize a long life of the speaker device by
preventing a decrease in vibration damping performance due to mechanical fatigue of parts, and
further, since no significant deformation occurs locally, a specific vibration or rubbing noise that
causes turbid sound quality It is possible to realize high-quality sound reproduction without
turbidity and without turbidity.
[0034]
It is a longitudinal cross-sectional view which shows the structure of the conventional speaker
apparatus.
FIG. 1 is a longitudinal sectional view of a first embodiment of a speaker device according to the
present invention.
It is operation | movement explanatory drawing at the time of the drive of the speaker apparatus
shown in FIG.
It is a principal part longitudinal cross-sectional view of 2nd Embodiment of the speaker
apparatus based on this invention.
Explanation of sign
[0035]
Reference Signs List 23 dust cap 30, 40 speaker device 33 magnetic circuit 35 frame 35a bottom
plate portion 35b peripheral wall 35c, 35d diaphragm support portion 37 central axis 41 first
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diaphragm 41b (first diaphragm) inner circumferential portion 42 second Diaphragm 42b
(second diaphragm) Inner circumference 45 Voice coil bobbin 46 Voice coil 57 Magnetic gap 51
Yoke 53 Magnet 55 Top plate 61, 62 Edge 65 Gasket 67 Sealed space between diaphragm 81
Rib
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