JPS58108898

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DESCRIPTION JPS58108898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrostatic transducer, and more particularly to an improvement of its diaphragm support
structure. Technical Background of the Invention Conventionally, a microphone configured as
shown in FIG. 1 is known as a type of electrostatic transducer. That is, this supports the
diaphragm (movable electrode) 4 on the front surface portion in the metal case 1 via the holding
ring 5't-, and has a predetermined gear to the diaphragm (movable electrode) 4 The fixed
electrode 3 is supported in a face-to-face state. In this case, the diaphragm (movable electrode) 4
is stretched via a conductive adhesive on the back side of the conductive holding ring 5 for
electrical connection with the case 1 serving as the ground path. Further, in the figure, 6 is an
integrated circuit in which an element or the like for converting the impedance of the output
from the fixed electrode 3 is accommodated in the support 2 of the fixed electrode 3, and 7 is an
acoustic resistor (R, John 8) is a printed wiring board. The back vents necessary for
unidirectionality are not shown. Then, in the microphone configured as described above, if there
is a slight gap between the case 1 and each component accommodated therein, it becomes a
minute vent, which degrades especially the performance such as frequency characteristics. In
particular, the gap between the case ring and the retaining ring 5 is not permitted. However, in
the supporting structure of the diaphragm portion in the conventional microphone as described
above, the adhesion between the case 1 and the holding ring 5 is merely determined by the
pressing force of the crimped portion at the bottom of the case 1. As a result, in practice, a
considerable variation in adhesion occurred. Although the caulking operation of the case 1 is
carried out using a constant pressure and the oil odor having a stroke, the dimensions of the
parts stacked in the case 1 vary. If the adhesion between the case 1 and the holding ring 5 varies
in this way, the sensitivity as a microphone varies! As a result, I :: Diaphragm (movable electrode)
40 changes the number of basic resonance fluids, resulting in significant deterioration in
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performance. In addition, there have been many problems in reliability in that the electrical
connection portion is likely to break or the like when subjected to thermal shock or the like.
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed points, and has a simple configuration and reliably makes the adhesion between the
case and the holding ring uniform, and achieves performance and reliability as much as possible.
It is an object of the present invention to provide a very good electrostatic transducer in which
the supporting structure of the diaphragm portion is improved so as to be improved.
In summary, the electrostatic transducer according to the present invention supports a
diaphragm (movable electrode) stretched on a cough holding ring via a holding ring on the front
face in the case, In the case of □ that supports the fixed electrode with the predetermined gap to
the movable electrode) and faces the fixed electrode, the conductive rubber is interposed
between the front side of the holding ring and the case. ing. Embodiments of the Invention An
embodiment of the present invention will now be described in detail with reference to the
drawings. That is, FIG. 2 shows a case where the present invention is applied to a microphone,
and a diaphragm (movable electrode) 14 is supported on a front portion in a metal case 11 via a
holding ring 15t-this diaphragm (movable electrode) 14 , And the fixed electrode 13 is supported
by the support 12 so as to face each other. In this case, the diaphragm (movable electrode) 14 is
stretched via a conductive adhesive on the back side of the conductive holding ring 15 for
electrical connection with the case 11 serving as the ground path. In addition, a conductive
rubber 16 is interposed between the holding ring 15 and the case 11 in order to make the
substantial adhesion between the holding ring 15 and the case 11 uniform. In the case 11 and in
the lower part of the support 12, an integrated circuit (not shown), a cushioning material, and a
printed wiring board d similar to the case of FIG. The microphones are completed by being
stacked in order, and then the bottom of the case 11 is crimped to complete the microphone.
Thus, according to the microphone configured as described above, when caulking the bottom of
the case I, even if there is variation in dimensions among the parts housed in a stacked state in
the case 11, the case The conductive rubber 16 interposed between the holding ring 11 and the
holding ring 15 can substantially eliminate the gap between the two to make the adhesion
uniform and absorb the stress at the time of caulking. Since it can be relaxed, it can be stabilized
without variations in frequency characteristics and sensitivity. In addition, this can also
contribute to the equalization of the gap between the fixed electrode 13 and the diaphragm
(movable electrode) 14, so that the undesirable phenomenon of adsorption of the diaphragm
(movable electrode) 14 during operation can be prevented beforehand. Will be able to
Furthermore, since it is given to the pressure-bonding effect which can always hold the electrical
connection of each part satisfactorily, it is given to the pressure-bonding effect even when heat
or impact force is applied (especially when dropped etc.) The reliability can be excellent. The l1
lE3 figure shows the directivity characteristics according to the present invention (IIIIIB) K shown
in comparison with the conventional (-纏 A), although no change is given in the positive (0 °)
direction (curve C) It is obvious that according to the invention in the direction of the spine 1i
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(180 ') that the invention is superior.
Tsum-p, that of the conventional one (curved person) is 紘 good in the number of horse liquid
that becomes dint, but extremely unnecessary before and after it It has become. The present
invention is not limited to the above-described and illustrated embodiments, and it goes without
saying that various modifications and applications are possible without departing from the scope
of the present invention. According to the present invention, as described above, according to the
present invention, the adhesion between the case and the retaining ring is surely made uniform
with a simple structure, and the performance and the reliability are improved as much as
possible. Thus, it becomes possible to provide a very good electrostatic transducer and sensor on
which the support structure of the diaphragm portion is mounted.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a structural explanatory view showing a conventional microphone, and FIG. 2 is a
cutaway structural explanatory view of a main part showing a case where it is applied to a
microphone as an embodiment of the electrostatic transducer according to the present invention,
Is a directional characteristic curve of a microphone to which the present invention is applied,
which is shown in contrast to the prior art.
11: Case, 12: Support body 13: Fixed electrode-14: Diaphragm (movable electrode), 15: Holding
ring, 16: Conductive arm 9.
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