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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional electrostatic
microphone, FIG. 2 is a sectional view showing one embodiment of the electrostatic microphone
of the present invention, and FIG. 3 is a main part of the same microphone It is a plane of 11 и и и и
electrode plate, 15 и и и и и и и The members are: 16 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Metal ring, 19
ииииииииииии Metal mesh.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic
microphone, and the object of the present invention is to provide an electrostatic microphone
which can obtain an appropriate aperture compared to the aperture of the microphone itself. It
is. Generally, as shown in FIG. 1, the electrostatic microphone supports the vibrating membrane
1: in a tensioned state in the case 3 by means of the vibrating rod holding ring 2, and via the
spacer 4 between the vibrating membrane 1 and the vibrating membrane 1. The electrode plate
6 is opposed to each other), and the electrode plate provided in the case 3 is configured to be
held by the member 6, and the electrode plate 6 is configured to be held by the member 6; In the
case of the directional microphone of the present invention, phase winding is provided to the
vibrating film 1. In this case, the acoustic resistor 7 constituting the phase wedge is constructed
so as to utilize the viscosity of the grooved air wedge provided between the electrode receiver
and the phase shift plate provided on the back surface of the member 6, or as an acoustic
resistance material. The metal mesh is attached to the sound hole or the electrode holder of the
front of the case at the rear opening of the member by adhesion or press-fitting. Recently, the
latter method has often been adopted in terms of easiness of production, and metal methos with
less variation is often used. However, when using a metal mesh as the acoustic resistance
material, the resonance point of the metal mesh itself must be removed from the band of the
microphone itself, so the diameter or thickness of the metal mesh is restricted and sufficient
openings are There is a drawback that it can not often be obtained. The present invention solves
such a conventional defect, and in the following, FIG. 2 which will be described together with the
drawings of the present invention together with the drawings of the present embodiment shows
one embodiment of the present invention. A 3451i 11 diaphragm, a 12 diaphragm vibrating ring,
and the diaphragm 11 is supported with an appropriate tension. Reference numeral 13 denotes a
case, to which the vibrating membrane 11 held by the vibrating membrane holding ring 12 is
attached. An electrode plate 14 is opposed to the vibrating film 11, and the electrode receiver is
held by a member 15 and supported in the case 13. The vibrating membrane 11 and the
electrode plate 14 are kept at an appropriate distance by a spacer 16 provided therebetween,
and the electrode receiver is pressed into the back opening of the member 15 to form a solid
phase number Acoustic resistance, which comprises a metal ring 18 and a metal mesh 19. The
above-mentioned gold filj ring 18 has a structure in which concentric ring-like ring portions 18a
and 18b are connected by radial cross-pieces 1ea, 1ea and 1ae as shown in FIG. 3, and metal
mesh 19 is formed on one side It is fixed by a rubber adhesive 20.
With this configuration, the shape D of the metal ring 18 can change the vibration mode of the
phase shifter and throw the resonance point out of the band, so the metal mesh is restricted by
its size and thickness 3464. Instead, one with a free size can be used, and an appropriate
aperture can be realized as compared to the aperture of the microphone. Generally, when metal
mesh is used as an acoustic resistance material, the variation in resistance tends to decrease as
the resistance increases, so it is conceivable to use a material with less variation over a wide area,
and the size of the metal mesh is large. Can be used for microphone units with a relatively large
diameter, and can be made as a non-adjustment type microphone unit, since manufacturing is no
longer restricted by the size and thickness. A cheap and inexpensive microphone unit can be
supplied. The metal ring is intended to change the vibration mode, and the shape thereof is used
for applications other than the embodiment. The same function and effect can be obtained by
press-fitting and fixing the curved surface opening of the case 13 in addition to the acoustic
resistance 17 and the back opening. As described above, according to the present invention,
since the 347 l-: constituting the phase number is constituted by attaching the metal mesh to the
metal ring, the resonance resistance is changed by changing the vibration release mode in the
shape of the metal ring. It is possible to set it, and therefore, it is possible to give an appropriate
opening compared to the diameter of the microphone without being restricted by the metal
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