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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a microphone
according to an embodiment of the present invention, and FIG. 2 is a schematic view of its
acoustic resistor. A31 ··· · · · · · · · · · · · · · · · · · · · · · · · · Acoustic resistor (metal mesh). Figure 1
Figure 2 1-57
DETAILED DESCRIPTION OF THE INVENTION By using the novel acoustic resistor, the
microphone Km is designed to obtain more uniform acoustic characteristics. Make the back
electrode side an appropriate aperture structure for rounding to introduce back surface sound
pressure from the back electrode side in a unidirectional hdd microphone, etc. in a unidirectional
directivity condenser volume microphone etc. To achieve the desired acoustic characteristics.
However, the felt used for this is a plant-based or animal-based fiber cone 1 A synthetic 511 m
fiber cone, etc. are collected, fitted, and irregular one from K, so the density 1 changes from
external pressure (1) Also, warm 1. The vM が also changed significantly depending on external
factors such as warmth. That is, in the felt used as the conventional acoustic resistor, the air
permeability changes due to various factors, and a stable acoustic resistance can not be obtained.
Therefore, it was necessary to consider the welding condition of the resistor as well as the
resistor itself, and to obtain uniform regeneration characteristics. 0 Because the air permeability
is uneven, the area must be enlarged, etc. It looks like This invention was made by paying
attention to the above points, and its object is to provide a microphone in which a stable acoustic
resistance can be obtained by replacing the felt, which has been conventionally used as an
acoustic resistor, with a metal mesh. It is. Next, the present invention will be described according
to one embodiment. FIG. 1 shows a condenser microphone, 1 is a diaphragm and 2 is a back
plate. The back electrode plate 2 is provided with a plurality of through holes. 3 is a rear plate
disposed on the back surface of the back electrode plate 2 and having a vent 31; (2) 4 is a metal
mesh acoustic resistor which is fixed so as to cover the upper surface of 1l IE 3 and in particular
the upper portion of the through hole 31 thereof. And this metal mesh is made of stainless steel,
and in order to make its own vent small enough, it is squeezed out regularly by the 107am warp,
the weft of a04sa, and the K of K. As described above, the present invention replaces the felt,
which was conventionally used as an acoustic resistor, with a metal mesh, so there is no influence
on the air permeability depending on the pressure per turn 5Oiit, at-town, and the acoustic
resistance is uniform. Stable 5- ・ ・ ・ If this point is described in comparison with the
conventional felt lift, at @ 1, the metal mesh O * coating does not change due to external factors,
so its ventilation does not change * Since the density is the same in any part of $ I2Km, the
desired acoustic resistance effect can be exhibited in a small area.
* There is no rounding at the time of being * spc * metallic and there is no change in the material
in its processing and * handling. Fourth, the adhesive is not always necessary for mounting, and
it can be fitted as well (3), so it is extremely easy KIIII! I can wear it. 5th K. Similarly, in the case
of KiM attachment, in the case of felt, the adjustment is necessary because fluctuation of
peristalsis occurs for each microphone, but in the case of metal mesh, since the property is
uniform, adjustment of the amount of penetration is There is no need.