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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram of a microphone
according to an embodiment of the present invention, FIGS. 2a and 2b are front views of
shielding plates used for the microphones, and FIG. It is a front view of the state which combined
the board. 1 ······ Diaphragm, 7, 8 ········ Shielding plate, 9 ··············· Fig.1 Fig.2 α-57-Actual opening
49-68g24 (2) -58-
DETAILED DESCRIPTION OF THE INVENTION According to the invention, the sound volume of
the microphone of the present invention can easily be controlled by the microphone K11.
Conventionally, the sound of the microphone body * tvlIxt-th structure is integrated with the
variable m device etc. to the microphone body and the number v'1 is simple, but the structure is
simpler than the present invention ri, and the volume tube 11% -f The present invention will be
described in conjunction with an embodiment of the present invention. In FIG. 1 VC, the
microphone 1 comprises a microphone 1 and a -62f voice coil 3 and one end of this /) gate coil 3
is connected to the output end 7-4. Kameko 4 has an external voice amplification 1g II + 6------ 上
曾 冑-回? The town variable resistance 2 · s 6 during volume control is built in 8B. And the bustle
1 (0 咄 surface is released integrally with the main body of the microphone and 92 one-coverings
@ 7.8 are rotatably attached to I / 1 When the through holes 9 of more radial shape are provided
up to the number of writings and the through holes 9t of two 1-covering @ 7.8 are combined
respectively, the opening is maximized, while the first plate T? If it rotates at a constant angle, it
will be closed according to the position of the through holes 9 of the two diffuser plates 7 ° 8
and it will be closed in the through holes 9 and the opening area will be minimum. Therefore, the
user of the microphone can freely change the amount of f by adjusting the passing of the sound
wave freely by rotating the scattering plate 7f attached to the microphone body V, and the
external voice amplification circuit 60 Town Prize resistor 46 'F The volume can be easily
adjusted at hand with an orchid single-car structure without any operation. As is apparent from
the above embodiment, the present invention can rotate two cover plates W with a number of
through holes け θ in the diaphragm @ surface, with Kjll attachment being nine microphones
and one cover plate rotated. By passing through the sound wave easily tpw 唄 11! ! The
microphone f cost book itself can freely adjust the 3 · sound volume and has a simple
configuration and so on.