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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of a conventional
microphone, FIG. 2 is a side sectional view of a microphone according to an embodiment of the
present invention, and FIG. 3 is a perspective view of the relevant part. 17 ...... support, 19 ......
auxiliary ring, 23.24 ...... hole, 27 ...... recess.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional
microphone and is intended to facilitate formation of a phase circuit. In the conventional
microphone, as shown in FIG. 1, while mounting the acoustic resistor 3 on the support 2 for
supporting the fixed electrode 1 by means of the fixture 4, the space 6 between the substrate 6
forming the preamplifier and the acoustic resistor 3 and the case The holes 8 and 9 connecting
the outside of 7 are provided in the support 2 and the case 9). However, in this microphone, the
holes 8 and 9 must be aligned in the manufacturing process. 1. Bamboo 2- "The present
invention makes such a process unnecessary and facilitates manufacture, and will be described
below with reference to an embodiment shown in Figs. In the figure, 11 is a face cloth, 12 is a
case, 13 is a diaphragm holding ring, 14 is a spacer, 16 is a fixed electrode, 16 is a terminal
plate, 17 is a support, 18 is an acoustic resistance, and 19 is an auxiliary ring. A hole 23 is
provided in the lower part of the upper part. 20はFET。 21 is a cushioning (buffering) sheet,
22 is a printed circuit board, 24 is a hole provided in the case, and 26 is a vibrating film. That is,
this microphone is the same as the microphone of FIG. 1 in that it is provided with a hole 23.24
when the space portion 26 between the substrate 21 and the acoustic resistance 18 and the
outside of the case 12 is connected. A part of the cylindrical auxiliary ring 19 is used as a recess
27 so that there is no hindrance even if there is a gap, and the recess 23 is provided in the recess
27. Therefore, even when the holes 23 and 24 are not in the same position, the space 2e and the
outside of the case 122 ′ ′ ′ ′ are connected by the hole 23, the recess 27 and the hole 24.
3]-Case 12 To the support 17. There is no need to give special consideration when inserting the
auxiliary link 19. The support 17 and the auxiliary ring 19 may be simultaneously formed, and
the recess 27 and the hole 23 may be provided thereon. As apparent from the above-mentioned
embodiments, according to the present invention, the manufacture can be simplified without the
deterioration of the performance.