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DESCRIPTION JP2008193653

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DESCRIPTION JP2008193653
An object of the present invention is to provide a diaphragm capable of setting a high sound
pressure and having a good rise by suppressing the divided vibration of the diaphragm to reduce
acoustic distortion and improving the rigidity of the diaphragm. SOLUTION: The rigidity of a
diaphragm is improved by filling a reinforcing material on the back of a convex portion provided
as a voice coil attaching portion and forming a diaphragm with a two-body structure of a
diaphragm base and a center cap. Thus, the damping of the vibration between the voice coil and
the diaphragm is reduced to provide the user with a good rise and a high reproduction sound
pressure. [Selected figure] Figure 4
Diaphragm structure
[0001]
The present invention relates to a diaphragm structure of a substrate mounting type component
represented by a multifunctional vibration actuator.
[0002]
Conventionally, it is difficult to use a cone-shaped type that requires depth for the diaphragm,
because of its application in board-mounted sound reproduction equipment represented by a
multifunctional vibration actuator having a sound reproduction function and a bodily sensation
vibration vocalization function. A structure such as a dome shaped diaphragm has been used,
which can be configured to be relatively thin.
[0003]
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However, since the dome-shaped diaphragm uses a structure in which the voice coil is attached
to the boundary between the center dome and the sub dome, the phase of the vibration on the
center dome side and the vibration on the sub dome side are reversed when the voice coil is
driven. There is a problem that there is a part that cancels out each other.
With regard to such a problem, there is a structure described in JP-A-2006-109090 (hereinafter
referred to as Patent Document 1), and this problem is solved by enhancing the rigidity of the
voice coil attachment portion provided on the diaphragm.
[0004]
In addition, in the structure described in Japanese Patent Application Laid-Open No. 2006229656 (hereinafter described as Patent Document 2) separately from Patent Document 1
described above, a ring made of a material with lower rigidity around the periphery of the central
portion of the separately configured diaphragm. By mounting the outer peripheral portion of the
above and fixing the voice coil to the central portion, the effect of improving the diaphragm
manufacturing efficiency is obtained.
[0005]
In addition, according to Patent Document 2, the two-body structure prevents occurrence of
abnormal vibration in the central portion, and allows a margin at the vibration limit of the outer
peripheral portion to suppress the lowest resonance frequency.
[0006]
Patent Document 1: JP-A-2006-109090 Patent Document 2: JP-A-2006-229656
[0007]
On the other hand, the diaphragm described in Patent Document 1 has a problem that the
annular member has to be attached along the boundary shape of the center dome and the sub
dome when the diaphragm is assembled.
In addition, because of the dome shape, there is a problem that it is difficult to make the entire
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diaphragm thin.
[0008]
Further, the diaphragm described in Patent Document 2 has a problem that the rigidity can not
be improved by using a diaphragm other than a resin material such as magnesium because it is
premised on the use of a light transmitting resin. At the time of acoustic reproduction, the
rigidity of the diaphragm may be insufficient to cause acoustic distortion.
[0009]
In view of the problems described above, the present application provides a diaphragm that can
be easily assembled regardless of the shape of the diaphragm, can maintain rigidity regardless of
the material of the diaphragm, and suppresses acoustic distortion in a wide band. The purpose is
that.
[0010]
In order to solve the above problems, in the invention according to claim 1, a voice coil
attachment portion is formed directly on the integrally formed diaphragm base, and a structure
in which a reinforcing material is filled and a center cap is overlapped is used.
Therefore, it is possible to obtain an effect of facilitating the assembly of the entire diaphragm by
forming the voice coil attachment portion integrally with the diaphragm as well as improving the
rigidity of the diaphragm by forming the diaphragm in the thickness direction. it can.
[0011]
In addition, after the back surface of the mounting portion is filled with a reinforcing material to
form a reinforcing portion, the center cap is overlapped, thereby further adding the rigidity of the
diaphragm including the voice coil mounting portion to the above-described effect, and further.
While being able to improve, it becomes possible to suppress the division | segmentation
vibration inside a diaphragm and to prevent generation | occurrence | production of acoustic
distortion.
[0012]
Also, by arranging the center cap just above the voice coil mounting portion, the acoustic
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characteristics at the time of reproducing an acoustic signal are set by the thickness, material,
etc. of the center cap, and the damping of the vibration between the voice coil and the diaphragm
is small. can do.
[0013]
According to the second aspect of the present invention, the voice coil attached to the diaphragm
base is rewound from a cylindrical shape to make the linear area coefficient uniform and then reformed into a predetermined shape. It is possible to stabilize the linear area ratio in the voice coil
by forming it into an arbitrary shape after winding by applying uniform tension, and vibrating
the diaphragm with less variation after mounting on the diaphragm. .
[0014]
In the invention according to claim 3, the flat shape is used for the center cap, thereby
suppressing the thickness dimension of the entire diaphragm and at the same time making the
variation of the output sound pressure at each frequency flat and at the time of sound
reproduction Distortion can be reduced.
[0015]
Hereinafter, the best embodiment of the present invention will be described with reference to
FIGS. 1 to 4.
[0016]
FIG. 1 shows a perspective view of a multifunctional vibration actuator equipped with a
diaphragm used in the present embodiment.
[0017]
As can be understood from the perspective view shown in FIG. 1, the multifunctional vibration
actuator used in the present embodiment has a configuration using a rectangular housing 7,
corresponding to the planar shape of the housing 7, It became the structure which used the
rectangular planar shape for the diaphragm to mount.
[0018]
For this reason, the surface area of the speaker portion can be secured widely, and the sound
pressure can be increased, and compared with the conventionally used cylindrical multi-function
type vibration actuator, the cylindrical shape with respect to the mounting space on the
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mounting substrate It became possible to arrange more efficiently than when it was configured.
[0019]
In addition, from the side sectional view seen from the direction of AA 'of FIG. 1 shown in FIG. 2,
the exploded perspective view shown in FIG. 3, and the side sectional view around the voice coil
3 shown in FIG. As can be seen, the multifunctional vibration actuator used in the present
embodiment includes the voice coil 3 disposed in the magnetic gap G by selectively using the
input frequency to the voice coil 3 input from the feeding terminal 10. A dynamic type structure
is used which vibrates the diaphragm of the body structure, and the magnetic circuit unit
including the pole piece 4, the magnet 5, the yoke 6, and the suspension 7 housed in the housing
formed by the housing 8 and the cover 9. .
[0020]
Further, in the diaphragm of the two-body structure used in the present embodiment, the back
surface of the voice coil attachment portion B provided in the diaphragm base 2 is filled with the
reinforcing material C made of a resin material, and a flat plate shape similarly made of a resin
material. The structure closed by the center cap 1 of
Therefore, the rigidity of the diaphragm composed of the diaphragm base 2 and the center cap 1
can be improved by the reinforcing portion formed by the filled reinforcing material C.
[0021]
In addition to the above effects, the voice coil 3 used in the present embodiment is wound into a
cylindrical shape and then formed into a square shape as shown, and compared with a voice coil
wound into a conventional direct square shape. As a result, it was possible to obtain an effect of
stable sound and vibration characteristics by using a voice coil having a small variation in area
ratio.
[0022]
Further, in the present embodiment, an annular diaphragm structure D is provided in the
diaphragm base 2 to increase the amplitude at the time of sound reproduction of the center cap
1, and the speaker of the diaphragm base 2 is provided by the rising portion E provided at the
mounting portion of the diaphragm base 2. In addition to the effect by using the said rectangular
planar shape, the sound pressure at the time of sound reproduction was able to be raised by
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expanding the area which functions as.
[0023]
As described above, by using the diaphragm structure described in the present embodiment, it is
possible to obtain stable acoustic characteristics by reducing the acoustic distortion such as
divided vibration with less loss at the time of driving the voice coil. .
[0024]
A perspective view of a multifunctional vibration actuator used in an embodiment of the present
invention A side sectional view seen from the direction of AA 'of FIG. 1 An exploded perspective
view of a multifunctional actuator used in an embodiment of the present invention Enlarged view
of the vicinity of the voice coil of the side sectional view shown in FIG. 2
Explanation of sign
[0025]
Reference Signs List 1 center cap 2 diaphragm base 3 voice coil 4 pole piece 5 magnet 6 yoke 7
suspension 8 housing 9 cover 10 terminal B voice coil mounting portion C reinforcing material D
aperture structure E rising portion G magnetic gap
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