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JPS5295423

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5295423
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic
electroacoustic transducer, and in particular, bonding of a conductive spacer ring and an 8J
moving electrode hood interposed between the outer peripheral edge portions of an electret
fixed electrode and a movable electrode. It relates to the improvement of the structure.
Conventionally, an electrostatic electroacoustic transducer adopted as a speaker or the like has a
configuration of 2-> N as shown in FIG. 1, for example. In FIG. 1, the electret fixing 111 is formed
by forming an electret electrode surface 13 made of an insulating material on a rigid back
electrode 12. The movable electrode film 14 is formed by forming a conductive [J6 on an
insulating film 15 such as a polymer film by gold plating or the like. The electret electrode
surface 13 of the fixed electrode 11 and the guide 16 of the movable electrode film J4 face each
other at a predetermined minute gap. A spacer ring 17 made of gold is interposed between the
outward end portions of the electret electrode surface 13 and the conductive $ 16 in the facing
gap. The fixed electrode 11 and the movable electrode film 14 are integrally fixed together with
the spacer ring 11 until each outer end is held by the holder 18. Further, a nonconductive
adhesive 19 having strong adhesion is applied between the opposing surfaces of the spacer ring
11 and the movable electrode film 14 so that the both members J7. J4 is fixed. By the way, along
the contact portion between the circumferential surface of the spacer ring 11 and the conductive
film 16 of the movable electrode film 14, a conductive adhesive 111j (not shown) is applied
along the side of -6, v1. Both the above-mentioned 17.16 are electrically connected by this
adhesive. Then, the signal @ 20 ° 21 is connected to each of the spacer ring 11 and the fixed
electrode 11, and the sound-voltage source 22 is connected between the two signal lines 20.21.
Nine fixed electricity and other 1 and movable electrode 1! A plurality of through holes 23 are
dispersedly provided in the fixed electrode 11 so as to communicate the space between them and
the external space. Therefore, since the audio voltage is applied between the fixed electrode 1
and the movable electrode @ 14, the electrostatic attraction between the both 11.14 changes in
accordance with the level change of the audio voltage. That is, the movable electrode @ 14 picks
up in response to the audio voltage and radiates the sound wave to the entire outside. The reason
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why the one signal line 20 is connected not to the movable electrode $ 14 but to the spacer ring
17 is that if the signal line 20 is connected to the movable electrode 14, it is connected to the
image pickup portion from the relation of the wiring space However, it is not preferable from the
viewpoint of the vibration characteristics of the movable electrode film 14 if it is connected to
this vibration portion −: 1, + M.
Since the adhesive is applied to the vibrating portion of the vibrating portion 4 (~ the abovementioned converter 11c, the movable electrode film in contact with the inner peripheral surface
of the spacer ring 11), is there. In addition, since the conductive adhesive as described above has
weak adhesive force, the adhesive surface of the adhesive-coated portion is easily peeled off
when it receives the movement of the 9 勅 electrode @ 14, and the space I + ring 17 and the
movable electrode There is a defect in that it is in a non-conductive state with WA14. Such a nonconducting state has the disadvantage that the efficiency of the converter is quite linear. The
operation of applying a conductive adhesive to the junction between the inner surface of the
spacer ring 110 and the movable electrode 14 as in the txh mark is troublesome. The present
invention has been made to eliminate the above-mentioned disadvantages, and provides a highly
reliable electrostatic electro-acoustic transducer which can be simply and reliably bonded to the
spacer ring and the movable electrode film. In the conventional electrostatic electroacoustic
transducer described above with reference to FIG. 1, the present invention is an improvement on
the bonding structure between the spacer ring and the town moving electrode, and the other
parts. Is the same as that of the conventional example, and the detailed description thereof is
omitted. The improvement will be described below with reference to all the drawings. The spacer
ring 3 is shown in FIG. 2, and three holes 32 are formed in the same direction as the fine core by,
for example, opening at equal intervals around the axial center. Then, as shown in FIG. 3, the
spacer ring 31 is disposed to face the outer peripheral end of the conductive alJ 6 of the movable
electrode @ 14, and the conductive adhesive 33 falls into each hole 32 of the spacer ring 31 I'm
jealous. Also, the effect of curling of the adhesive 33 at the time of original insertion appears nl
The spacer ring 3 and the conductor 116 conduct to the iti '+ from the conductive adhesive
33Vc. In FIGS. 2 and 3, 15 is an insulating film and 19 is a non-conductive adhesive. By means of
the above-mentioned electrostatic electrostatic transducer, the conductive adhesive between the
non-oscillating portion of the 61 隻 electrode film 14, ie, between the mounting portion and the
spacer ring 31. There is no cedar # that gives a bad impression on the dynamic characteristics of
the moving electrode win J 4 by this adhesive 33 because there is a lead t from 33 v C, ..., ま,
Space as above? Since the conductive adhesive 33 adheres to the fixed portion of the tongue 11
and the movable electrode film 14, there is little possibility that the contact Ht agent 33 is peeled
off by the movement of the movable electrode film 14. Even with long-term use, the stability of 1
記 viewing is good, the conversion efficiency is not extremely reduced, and the reliability is very
high. Since the area of the conductive portion of the spacer 31 and the movable electrode 11114
can be increased by selecting a large diameter of the hole 32 of the 17'C spacer ring 31, the
conductivity of both 31.14 is good.
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Further, since a portion 1pl of the pair of the spacer ring 31 and the movable electrode film 14 is
bonded by the conductive adhesive 33, the bonding of both 31.14 is further strengthened. B,
passed away. The operation of placing the conductive adhesive 33 in the holes 32 previously
formed in the ring 31 is performed as in the prior art on the inner peripheral surface of the
spacer ring 17. It is extremely simple as compared with the work of applying an adhesive to the
contact portion between the second and third movable electrodes. In the above embodiment, the
electric noble sheet conversion operation has been described, but the reverse Wcf 葭 is given to
perform the sound-to-electricity conversion operation? In order to do this, K may be connected to
an output signal takeout resistor instead of the audio voltage source 22. In addition, although the
above-mentioned affair example shows a so-called single type converter, it is not limited to the
present invention, but not limited to butch sol type, or the fixed self-sponsoredness of the pole,
and the whole rock is completely open. Needless to say, it can be applied to a so-called twin
converter having a four-mirror arrangement structure. As described above, the present invention
can bond the spacer ring to the town kinekyo other hood and the gold easily and # 1 and can
provide all the high-power, high-power, low-power, electric-toner type sound transducers.
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