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The present invention relates to an electromechanical vibration converter for converting an
electrical signal in the low frequency range into mechanical vibration. (Prior Art) A so-called lowpitched sound having a frequency of 150 Hz or less is not only recognized by hearing but is also
felt by the body in a squeezing manner, and it can be felt as a sound full of presence due to their
overlapping. Therefore, various electro-mechanical vibration conversion devices have been
developed which convert the electric signal of the bass region into vibration. One of them is
disclosed in Japanese Patent Application Laid-Open No. 58-218269. In this prior art, a frame
(housing case) having a step on the inner peripheral surface and a cover plate fixed to the rear
end face, a magnet and a damper are integrally provided, and the damper is fixed to the step It is
comprised from the yoke provided in the inside, the excitation plate (lid body) fixed to the front
end surface of the said flame | frame, and the voice coil provided so as to oppose the said yoke in
this excitation plate. However, according to such a structure, the frame is provided with a yoke,
and the excitation plate is provided with a voice coil. Therefore, at the time of assembly, the yoke
is attached to the frame with high accuracy, the voice coil is attached to the excitation plate with
high accuracy, and the relative alignment between the frame and the excitation plate is
performed with high accuracy. There must be. Therefore, it takes much time for assembling
work, and there is a case that the workability is very bad. (Problems to be Solved by the
Invention) As described above, in the conventional structure, since the yoke and the voice coil are
separately provided for the housing case and the vibration plate, there is a case that the
assembling property is bad. The The present invention has been made based on the abovedescribed circumstances, and an object of the present invention is to provide an
electromechanical vibration converter in which productivity is improved by providing a yoke and
a voice coil in a housing case. It is to provide. (Means for Solving the Problems and Actions) In
order to solve the above-mentioned problems, the present invention is characterized in that-the
housing case with an open side, the magnet and the damper are integrally provided and this
damper is formed in the housing case And a voice coil provided at a portion of the housing case
which is elastically supported in the housing case, a voice coil provided at a portion of the
housing case facing the yoke, and an open side of the housing case. And a lid. Then, by providing
a yoke and a voice coil in the above-mentioned storage case, assembly is facilitated.
the present invention will be described with reference to FIGS. 1 and 2. The electromechanical
vibration converter shown in FIG. The housing case 1 is in the form of a bottomed dish whose
upper surface is open and the peripheral wall is inclined outward, and a yoke 4 having an
annular magnet 2 inside is elastically held by a damper 4. ing. That is, the yoke 2 is composed of
a pole piece 6 having a bottom plate 5 formed at one end, and a ring-shaped yoke plate 7. The
magnet 2 is provided on one side of the bottom plate 5 by bonding and fixing one side, and one
side of the yoke plate 7 is connected and fixed to the other side of the magnet 2. The damper 4 is
provided on the other side surface of the yoke plate 7 by bonding and fixing, for example, with
an adhesive. The damper 4 has a ring-shaped plate such as a spring steel plate, and the inner
peripheral portion thereof is indirectly fixed to the other side surface of the yoke plate 7 directly
or through an elastic material (not shown). Moreover, while four protrusions 9 are protrusively
provided on the outer periphery of the damper 4 at intervals of 90 degrees in the circumferential
direction, the predetermined length along the circumferential direction inward in the radial
direction of the portion corresponding to each protrusion 9 Slit 11 is bored. The portion between
the pair of projections 9 is formed in the groove portion 12 by projecting the projection 9 on the
outer peripheral surface of the damper 4 and the portion sandwiched between the groove
portion 12 and the slit 11 is formed in the elastic beam 13 There is. The yoke 3 is elastically held
in the housing case 1 by the damper 4. That is, four attachment portions 14 are formed and
processed on the inner bottom portion of the storage case 1 at intervals of 90 degrees in the
circumferential direction, and the protrusions 9 of the damper 4 are attached and fixed to these
attachment portions 14 by pins 15 There is. Further, an opening 16 is formed in the central
portion of the bottom portion of the storage case 1. A voice coil 17 is provided in the opening 16.
The voice coil 17 closes the opening 16 and the mounting plate 18 attached to the outer surface
of the bottom wall of the storage case 1 is erected on the inner surface of the mounting plate 18
and the coil 19 is wound around the outer peripheral surface. It is formed of a bobbin 21. The
bobbin 21 is inserted into a space 22 formed by the outer peripheral surface of the pole piece 6
of the yoke 3 and the inner peripheral surface of the yoke plate 7 and the magnet 2. Then, when
an electric signal for driving the speaker of the acoustic device is input to the coil 19, the yoke 3
and the housing case 1 are resilient due to the magnetic interference between the magnetic force
generated in the coil 19 and the magnetic force of the magnet 2. Vibration is generated by
relatively displacing the beam 13 while elastically deforming it.
A flange 23 is provided at the upper opening end of the storage case 1, and the peripheral
portion of the lid 24 is joined to the flange 23 and fixed by a pin 25. Further, a large number of
through holes 26 for dissipating heat generated in the storage case 1 are formed in the mounting
plate 18 forming the voice coil 17. According to the electromechanical vibration converter
having such a structure, the yoke 3 and the voice coil 17 are attached and fixed only to the
housing case 1, and nothing is attached to the lid 24 closing the upper surface opening of the
housing case 1. I did not. Therefore, as compared with the case where one of the yoke 3 and the
voice coil 17 is provided on the housing case 1 and the other is provided on the lid 24, the
relative positional relationship between the two required at the time of assembly can be easily
obtained. That is, since the yoke 3 and the voice coil 17 need only be attached to the housing
case 1 accurately, the assembly can be easily performed. FIG. 3 shows another embodiment of
the joint structure between the damper 4 and the yoke plate 7. That is, a pin 7a for caulking is
protruded from the side surface of the yoke plate 7 -1, and an attachment hole 4a for fitting the
above-mentioned pin 7aj6 is bored in the inner peripheral portion of the damper 4 After the pin
7a is fitted, the damper 4 is fixed to the yoke plate 7 by caulking the pin 7a. In addition, a shock
absorbing material 31 such as fiber paper is interposed between the joint surfaces of the damper
4 and the yoke plate 7 so as to prevent chatter noise from being generated at the time of
vibration. [Effects of the Invention] As described above, according to the present invention, the
yoke is resiliently supported by the damper in the housing case with an open side, and the voice
coil is provided at a portion of the housing case facing the yoke. It was provided and nothing was
provided in the lid which closes the opening surface of a storage case. Therefore, the yoke and
the voice coil only need to be assembled with high accuracy to the housing case, and since the
assembling accuracy of the housing case and the lid is hardly required, the assembly can be
performed easily and efficiently.
Brief description of the drawings
FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a half
sectional plan view of the same, and FIG. 3 is a sectional view of the structure of the yoke and
damper attached showing another embodiment of the present invention. is there.
DESCRIPTION OF SYMBOLS 1 ... accommodation case, 2 ... magnet, 3 ... yoke, 4 ... damper, 17 ...
voice coil, 24 ... lid. Applicant agent Patent attorney Suzue Takehiko procedure amendment 1.
Display of the case Application Japanese Patent Application No. 62-109703 28 Title of the
Invention Electromechanical Vibration Converter 3, Relationship with the Case for Correction
Patent Applicant (AO3) French Bet Co., Ltd. 4, Agent Chiyoda Ward Tokyo 7 No. 2 UBE Building
7, Corrected specification, page 8 between lines 5 and 6 "The lid 24 in the present invention has
a sufficiently large area compared with the storage case 1 It may be. If such a lid 24 is used, the
transmission area of vibration can be increased. And join.
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