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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of the main
part of the prior art microphone microphone, and FIG. 3 is a cross-sectional view of main parts of
an electret microphone according to one embodiment of the present invention. Is a perspective
view of part of it. 11 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Support Link, 11 ',
16', 17 ', 18'...
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electret
microphone, in which the sound path can be enlarged. For example, as shown in FIG. 1, when the
sound hole 2 is provided on the upper surface of the vibrating membrane 1 and the sound path
pipe 3 is fixed to that portion, there is no problem. However, as shown in FIG. 2, when the sound
hole 2 is provided on the side of the electret microphone main body 4, the sound path vibrator 3
is an electret my 8) 2) 1 = = 1 2 2 (::, 1: :): ?; In the sound path leading to the front part of :::, Th,
'-16 juice 7 486 "21, there is a drawback that the area of the vibrating membrane 1 to the fixing
portion becomes smaller. The present invention eliminates such a drawback and will be
described in conjunction with one embodiment of FIGS. 3 and 4. 11 is a vibrating membrane, 12
is a sound hole, 13 is an upper case, 14 is a lower case, 15 is a base plate, 16 is a fixed electrode,
and 17.18 is a support ring of the vibrating membrane 11. In this case, as shown in FIG. 4, the
support ring 17.18 and the vibrating membrane 11 have the recesses 17 ', 18', 11 ', 16', and the
recesses 17 ', 1B', 11 ', 16'. Corresponds to the sound hole 12 as shown in FIG. Note that the
recess 11 may not be provided in the vibrating film 11 because of the diameter. That is, the
recess 17 'is formed in the support ring 17.18 where the vibrating membrane 11 of the portion
close to the sound hole 12 is to be fixed. An 18 'is provided to prevent the area of the sound path
of this portion from being reduced. Therefore, the area of the sound path can be made uniformly
large from the sound path pipe 3 to the front portion of the vibrating membrane 11 to obtain
stable sound) characteristics, and the thickness can be made thin. In addition, even if the position
of the sound hole 123 ░ evening or the fixation of the sound path vibration is downward (in the
direction of the lower case 14), a substantially uniform sound path area can be obtained by the
four parts, so freedom is obtained. As is clear from the above description, according to the
present invention, the narrowing of the sound path leading to the imaging film can be reliably
prevented, and good characteristics can be provided.
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description, jps5514361
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