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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a condenser
microphone to which the present invention is applied. In the figure, 1 is a case, 2 is a diaphragm,
5 is a back electrode, 6 is an insulating material, 6a is a tapered hole, 7 is a weir, 8 is an adjusting
nut, 8a is a fixing nut, 10 is a fixing nut, and 10 is a gap. 56/−69−
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a condenser
microphone in which the directivity of the microphone can be easily adjusted within a certain
range without sacrificing other characteristics. One embodiment of the present invention will be
described with reference to the drawings. (11 □□ 1 is a cylindrical case. Above the inside of the
case l, the diaphragm 2 has an upper surface around the diaphragm fixing ring 3 and a lower
surface around the lower surface. It is enshrined and positioned by the spacer 4, and it is taken
care of. The back electrode 5 is fixed by the insulating material 6 at a point K separated by a
small number 1jlll by the spacer 4 on the back surface of the diaphragm 2. The back electrode
5KFi is provided with a plurality of vent holes 12. As a material of the insulating material 6, what
has elasticity, such as rubber | gum and a synthetic resin, for example is suitable. A tapered hole
6a opened outward of the bottom Kd of the insulating material 6 is provided. The insulating
material 6 has both a filter effect and an electrical insulation effect on the case 1 of the back
electrode 5. A 杆 7 KFi screw provided at the center of the back surface of the back electrode 5 is
engraved, and the screw KFi adjusting nut 8 and the fixing nut 9 are screwed together. The upper
surface Kd of the adjustment nut 8 is formed with a taper 81 at the same angle corresponding to
the taper hole 6aK ′ ′ provided in the insulating material 6 described above. lO is a function
that occurs between the tapered hole 61 of the insulating material 6 and the tab 81 of the
adjusting nut 8 when the adjusting nut 8 is loosened. It is a back air chamber surrounded by 13Fi
back electrode 5 and insulating material 6. Since this device is configured as described above,
when the fixing nut 9 is loosened and the adjusting NAND 8 is rotated, it moves in the vertical
direction of the figure according to the screw of the adjusting nara) 8 # i 杆 7, so that the size of
the function pJ10 changes. The air flow resistance between the back air chamber 13 and the
outside of the microphone changes. Since this is nothing other than when the air resistance from
511II changes to the spine 4 due to the vibration due to the sound from the front of the
diaphragm 2, between the fully open state and the fully closed state ll The directivity
characteristics can be adjusted freely. After adjustment, the adjustment nut 8 is fixed by
tightening the fixing nut 9 with respect to the adjustment lever 8). In this embodiment, although
the fitting portion between the insulating material 6 and the adjusting nut 8 is formed as a taber,
this is limited to the taber (3) 71! The same effect can be obtained as long as it is a shape having
four angles in the longitudinal direction of the weir 7 even if it is a step shape or a curved surface
without 1l-QQI 91-ll. As described above, this invention can provide a condenser microphone
capable of freely adjusting the directivity in a certain range with extremely simple operation.
Since this adjustment does not affect the positional relationship KFi of the diaphragm 2 and the
back electrode 5, it has an advantage of being able to be performed without affecting the
frequency characteristic and the sensitivity characteristic at all.
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