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JPS55148300

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DESCRIPTION JPS55148300
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view showing an example of an
electrostatic electroacoustic transducer-FIG. 2 is a perspective view showing a conventional
diaphragm in a partial cross section, and FIG. 3 is the same diaphragm 4 to 9 show an
embodiment of the present invention, FIG. 4 is a perspective view showing an assembled state,
FIG. 5 is the same sectional view, and FIG. 6 is FIG. 5 is an enlarged sectional view showing a part
of FIG. 5, FIG. 7 is a plan view showing the main part, FIG. 8 is a sectional view taken along the
line II--II in FIG. 1, and FIG. . S 10 ...... retaining ring 22 ...... vibration film, 23 ° 24 ...... conductive
layer, -25 ...... non deposition region.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield plate of
an electrostatic electroacoustic transducer 4 used in, for example, headphones, microphones and
the like. For example, as shown in FIG. 1, the electrostatic electroacoustic transducer has the
imaging plate 2 disposed opposite to each other between the electrodes 1.1, a DC bias voltage is
applied to these, and the imaging plate 2 is I'm trying to shoot. By the way, the configuration of
the conventional imaging plate is, for example, 21st- / e-ePjo. -As shown in the figure, a thin film
w4 of synthetic resin such as polyester (P, co, T, P) resin film with a thickness of 2 to 4 P is
stretched on the holding ring 3, and this surface of the film is covered. As a whole, the elastic
conductive layer 5 with a thickness of 300 to 800 A such as aluminum is covered as an
electrode. As shown by an imaginary line in FIG. 3, the shooting mode of the shooting @ 4 in such
a conventional peristaltic plate has a small amplitude in the peripheral portion compared to the
central portion, and the shooting effective area Efficiency is low and sensitivity is generally poor.
In addition, since the conductive layer 5 is made thin and flexible to give flexibility, split
resonance is likely to occur, causing defects such as distortion of strain and narrowing of the use
band. The present invention has been made in view of the above circumstances, and by making
the overall amplitude from the central portion to the peripheral portion uniform, the effective
imaging area is enlarged and the sensitivity is improved. It is a further object of the present
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invention to provide a diaphragm of an electrostatic electroacoustic transducer which is capable
of reducing the occurrence of distortion and widening the use band. Hereinafter, an embodiment
of the present invention will be described with reference to FIGS. 4 to 9. This embodiment is an
electret type headphone unit to which the imaging plate of the present invention is applied. First,
the configuration of the electret type headphone unit will be described with reference to FIGS. 4
to 6. The imaging plate 10 is ^ 1 between the front case 1 ′ and the rear case 18 and the
imaging plate 10 The auxiliary ring 11 is disposed on the rear case 18 side of the above and is
held by the spacers 12.12 and the electrode plates 14.14 between the auxiliary ring 11 and the
rear case 19 and between the moving plate 10 and the front case 17 The electret 13.13 and the
moisture proof 15.15 held by the holding ring 16.16 are arranged. The rear case 18 is fixed to
the front case 17 by tapping screws. In addition, a compensation cloth 4 is bonded to the back of
the rear case 4. The moving plate 10 is thin as, for example, 3 to 4 thick polyester 'It'll' f film on
the holding ring 21 made of gold metal paired with the auxiliary ring U as shown in FIG. 7 and
FIG. 8 It plays 4 allotment rumor 22.
For example, a ring of aluminum, titanium / i [Q 'exclusive high elasticity conductive 23-23.24 is
a ring of a predetermined width on the inside (4) side of the holding ring 4 in the @ イ 則 面 of
this pregnancy movement 喚Is deposited in advance by means of vacuum evaporation or the like
at approximately 3000 A) leaving a non-deposition area δ of In the figure, the reference
numeral 26 denotes a ring layer which is attached to the conductive layer path 4 at the same
time as the conductive layer path 4 in order to align the holding ring 21 with the conductive
layer path and position. In addition, in the lead layer connecting the conductive layer portion and
the lead @ shame connecting 4 and the ring +1126, the 1 Jili QJ path 24 and the holding ring 21
have the same potential. With such a configuration, the base plate lO is a conductive layer
portion, leaving the non-adhered area in the form of a ring at the central portion of the i
exposure 22 filmed on the holding ring, Because the side is covered, unlike the case where four
layers are applied to the whole of the conventional shooting army, the non-collapsible M25 has a
large self-susceptibility, and the conductive layer portion compared with that. The anchored
portion of the award has a hard flat state. 4- For this reason, as shown in FIG. 9, the non-adhered
area is used as a damper so that the conductive wrestler and four parts vibrate with a uniform
part width. Therefore, the vibration effective area is larger than that of the conventional one, and
dust and dirt are transferred. In addition, the non-tube area δ is configured to allow large
vibration at the dark edge, and the central portion tmz, and the depth of the portion is
sufficiently j9 (for example, 3000 A as described above). It is possible to eliminate the extra
flexibility, and it is difficult to generate split co-imaging. Therefore, it is possible to reduce the
rate of occurrence of distortion and extend the used band. In the l8ItI station example, the
conductive layer part is attached to the side of the moving picture 22 (it is attached to the river
surface, but it is attached to only one side according to the arrangement relation of the rattan
board etc. It is also good. Further, when the holding ring 21 is made of a synthetic resin or the
like, the lead @ 2 of the embodiment can, of course, be omitted depending on the case. Similarly,
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the ring layer 264 for positioning can be omitted depending on the manufacturing method.
Furthermore, for example, the moistureproof board consisting of the moistureproof rumor 15
and the holding ring 16 shown in FIG. 4 is also a kind of moving plate, and the present invention
can be applied to this moistureproof board.
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