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Secretary General of Patent Office 1 Title of Invention (5) Application Examination Request Form
1-· Japanese Patent Office Public Patent Publication ■ Japanese Patent Application Laid-Open
No. 51-1.313150 Japanese Patent Application Publication No. 51. (1976)11. J5 Office
internal reference number 7, +,> 1, 什 specification 1, name of the invention 1, name of the
invention microphone
Microphone 2 = 23 of the invention as claimed in the claims == ’yx−)11.1. ヨウ
3. Detailed Description of the Invention The present invention relates to a microphone in which
an electrode is formed of a fine particulate metal in a porous state and a diaphragm in which a
metal layer is formed on an insulating film is directly contacted to the electrode. The diaphragm
has a function of collecting innumerably, response sensitivity and accuracy are improved, and the
electrode is formed into a spherical surface by sintered metal, and the processing accuracy of the
electrode is equalized, the reception function of the virtual point, ie, It has a point reception
function so that there is no time error in reception due to directivity. An ordinary condenser
microphone has a structure in which an electrode and a diaphragm have a certain air gap, which
senses a high voltage, or it is difficult to make the air gap uniform, and the accuracy is improved.
It is difficult and unsuitable for relatively short distance measurement. In addition, in a
microphone composed of a normal flat plate electrode and a diaphragm, an angular error occurs
due to the directivity of the transmission point, and the accurate distance can not be measured
by the reception time. The present invention pays attention to the points as described above, and
can accurately measure a relatively short distance and have a point reception function to prevent
an angle error due to the directivity of the oscillation point. Finally, the present invention will be
described in detail with reference to the drawings showing one embodiment in the case of having
a point receiving function. (1) is a porous spherical electrode made of fine particle metal, (2)
EndPage: 1 is a diaphragm in which a metal layer (2b) is formed on the insulating film (2a) and is
directly in contact with the electrode (1) 3) A highly insulating electrode fixing base for fixing the
electrode (1) through the ring (4), (5) a cylindrical microphone body, (6) a screw groove (5) on
the inner surface of the body (5) Lower adjustment ring screwed to the lower surface of the
electrode fixing base (3), screwed to the screw groove (5) 'and pressed to the -1- surface of the
periphery of the electrode fixing base (3) Upper adjusting ring, (8) an annular flange formed at
the upper part of the main body (5), (9) screwing the screw groove (5) 'and pressing the
peripheral portion of the diaphragm (2) 10) The diaphragm adjustment ring crimped through
10), (11) is the electrode terminal provided on the electrode fixing base (3), +12) is the electrode
(1) and the electrode end 'f (Il Leads connecting the bets, (13) the back air chamber of the
electrode width (A) and the electrode (1) an upper air chamber communicating with the upper
portion of (B) and communicating 1. One of sensitivity]-tm air flow through hole in ring (4) to
increase, (14) is open air open hole through electrode fixing stand (3), back air chamber (A) The
effect of the static pressure balance between the upper air chamber (B) and the outside (C) is to
prevent the diaphragm (2) from affecting or changing the external pressure, and the tail.
+6+ ', f7)', +9+ 'Hassle' n 'FIs adjustment ring (6), 11.1 adjustment ring (7), diaphragm adjustment
ring (9) . Furthermore, when forming the electrode (1) into a spherical shape, it is conceivable to
cut using a machine tool such as a lathe, but in machine cutting, an additive strain is generated, a
desired shape can be obtained hard, and directivity of high frequency pulses It is desirable to
form the sintered metal into a spherical surface by means of a molding die, in order to cause an
angular error due to and a false time error. In this case, in order to reduce the variation of the
electrode (1), the constant thickness of the mesh of the particle metal and the electrode (1) is
adjusted to increase the accuracy of directivity with respect to sensitivity and directivity. For
example, a mesh 40 with a thickness of 3 + mn is suitable. In addition, the diaphragm (2) uses,
for example, a polyethylene film of 6μ as the insulating film (2a), and forms the metal layer (2b)
as thin as possible on the top surface, and has a small electric resistance of about 2 to 3 Ω per
1σ Make it a value. Then, to align the center of the electrode (1) σ with the imaginary point CP
of the point reception function, the upper adjustment direction of the electrode (1) and the water
11 by the adjustment ring (6) and the upper adjustment ring (7). Adjust the position of the
direction, adjust the degree of adhesion of the diaphragm (2) to the electrode (1), the area and
the center position and tension of the diaphragm (2) by the diaphragm adjustment ring (9) Also,
since the upper air chamber (B) of the electrode (1) communicates with the back air chamber (A)
and the outside (C), the air circulation hole (13) and the open air hole (1ω), the vibration
excluded air is It can be circulated sufficiently and high sensitivity can be obtained. Furthermore,
since the electrode (1) and the electrode terminal (11) can be connected by a thin lead wire (121,
the entire thickness of the electrode (1) can be made uniform, depending on the position of the
reception point It is possible to eliminate sensitivity errors. In addition, it is a matter of course
that the shape of the electrode (1 → is not limited to the spherical surface illustrated, but may be
formed into a plate shape of H7, 7, and in this case, the point reception function is impaired or
the response sensitivity is improves. As in the past, according to the microphone of the present
invention, a porous electrode is formed of fine-grained metal, and a diaphragm in which a metal
layer is formed on an insulating film is brought into direct contact with this electrode to vibrate
the conventional electrode and vibration. As compared with the case of forming an air gear tube
with the plate, the innumerable micro surface areas of the electrodes have independent receiving
functions, there is no receiving angle error, and the accuracy is dramatically improved.
In addition, the air by the shift of the diaphragm at the time of reception distribute | circulates to
the back air chamber by the pore of the electrode itself becoming an air circulation hole-).
Furthermore, by forming the electrode in a spherical surface, reception at the virtual point (P)
becomes possible, and a microphone having a point reception function, ie, a point microphone
can be obtained, and a sintered metal is used for the electrode By forming a spherical surface by
molding, a desired spherical shape can be obtained without machining distortion due to
mechanical cutting, and a spherical electrode of uniform thickness without angular error can be
4. Brief Description of the drawings The drawing is a cross-sectional view of one embodiment of
the microbon of the present invention. (1) ... electrode, (2) ... diaphragm, (23) ... insulating film,
(2+) EndPage: 2 ... metal layer. Attorney Attorney Attorney 1) aL thick section 7 Inventors and
patent applicants other than the above (1) Inventor Hitachi Shipbuilding Co., Ltd National
Acoustics Research Co., Ltd. National Acoustics Research l Haya / Yonp Representative
Yoshiyoshi Hayashi EndPage: 3
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