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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view showing an
embodiment of the present invention. 1 · · · · · · · directional condenser microphone unit, r, keying.
Detailed description of the invention '1' JOnn 1 l! QQ-nQ equipment? A directional nondirectional shared condenser microphone that can be used by switching to either directivity or
non-directivity, which can be easily switched according to the use situation. The purpose is to do
one without having to use each one. In the following, the present invention will be described with
reference to the illustrated embodiment of "#", where l is a directional condenser microphone
unit and is fixed by a holder 2I. The rear surface 2 of the cage 2 is pierced by holes 3v which
allow the rear surface of the unit 1 to communicate with the atmosphere. The inside of the holder
2 is sealed between the front and rear surfaces of the unit 1). Reference numeral 4 is a front
cover with holes 1 and 17 and a hole formed, and 5 is a flat cover for attaching the cover 4 to the
M ′ ′ ′ ′ 31F 2. A support arm 6 is protruded rearward from the cage 2 to form a circle I *
7, 8 at a location I :. 6 is a plate mounted in the case 9 of a device for collecting or recording
sound, such as a tape recorder or a video camera, and 11% of fine spheres pressed against the
arm 6 by a splash (2) 10 By engaging the '6 groove 7 or 8, the position of the holding / wjE unit
2 is stably stopped (N%). This position holding mechanism may use other m systems that are
normally used. The numeral 12 is a backing made of soft rubber or the like for closing the hole
3v when the arm 6 is pushed into the case 9. The lead 13 of the microphone unit 1 follows the
vertical hole 14 in the arm 6 and is introduced into the case. Reference numeral 15 denotes a
vertical hole 14 (a dual-mounted FET preamplifier, and a reference numeral 16 denotes a
backing that blocks air from entering the back of the microphone unit 1 through the vertical hole
14. As described above (as shown in Fig. 1, as shown in Fig. 1, two retainers 2 are pulled out
from the case 9 and m 11V grooves are engaged with each other to stabilize the withdrawal
position vIt, the holes 3 on the back of the retainer are backing As a result, the back surface of
the microphone unit l communicates with the atmosphere, and the microphone operates as a
directional microphone. Therefore, it is possible to capture a conversation or a specific sound
while recording noise and noise while eliminating ambient noise V (3). When the holder 2 is
pushed into the case 9 and engaged with the steel ball 11v groove 8, the back surface of the
holder 2 is resiliently attached to the backing 12 and kept in the hole 3vIM state, and the
microphone operates as nondirectional. Therefore, it is possible to capture sound from a wide
range. As described above, the condenser microphone of the present invention can be switched
to one directional microphone or both directivity and non-directivity states by simple operation,
so the structure of a device such as a tape recorder!
Simplify, the device I! In fact, it can be manufactured at low cost on equipment.