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JPS553534

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DESCRIPTION JPS553534
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are sectional views of a conventional
directional microphone, FIG. 3 is a sectional view of a directional microphone according to an
embodiment of the present invention, and FIG. FIG. 5 is a sectional view of another embodiment.
3 иииииииииииииииииииииииииииииииии Resistor, 52.53 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Insulators
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional
microphone comprising an electrostatic microphone and the like, which aims to stabilize
directional characteristics, to reduce assembly cost, and reduce assembly cost. . In order to make
the microphone a directional microphone, it is necessary to introduce a sound wave from the
back of the vibration gauze and to control the vibration system on the resistance side U. For this
reason, as shown in FIG. 1, conventionally, when 1 is a diaphragm, 2 is a spacer, and 3 is an
electrode, a plurality of holes 51 are provided in the insulator 5 forming the back air chamber 4,
and A body 6, for example, a door surface or a non-woven fabric is provided and held by a
holding ring 7, and the case 8 is formed by curling or screwing. Also, as shown in FIG. 2, instead
of the damping material, an insulator mark and a spacer 9 for keeping a space of 10 to 100 P are
provided, and a thin fluid layer is formed by a phase plate 1 ░ in which a hole 1o1 is opened in a
flat plate. The microphone was made a pointing microphone using its viscous drag. Of the two
finger-type microphones described above, the acoustic resistance value of the resistor 6 changes
with the degree of curling or screwing of the case 8 in the former, so the directivity largely
varies, and the adjustment is often made after assembly. In addition, in the case of the
combination и 4, there was a necessity to put in small pieces of each component one by one, and
the hand chain property was inferior. In the latter case, the viscous resistance is determined by
the distance between the insulator 62 and the three phase shift plate 10. Therefore, in order to
make the viscosity resistance value constant, the flatness of the component needs to be constant.
As a result, it is warped by stress when curling or screwing the case 8 and it is necessary to use a
porcelain product because it is almost deformed, which is very expensive. In addition, it is
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necessary to assemble and insert each component one by one, and it is necessary to insert them,
and the productivity is lost. The present invention eliminates such a defect, and the following is
one implementation. An example is illustrated by FIGS. 3 and 4. In the figure, 1 to 4 and 6 are the
same as those of FIG. 53. 54 is an insulator corresponding to the insulator 6, and these are
configured to be press-fit fitted. In addition, the damping material 6 is properly fitted with
pressure so as to be inserted between them. Thus, in the case of a molded product, the thickness
dimension in which the resistance material is contained can be suppressed within the range of
molding variation, that is, about 5/1000 to 1/100, and smaller by the necessary amount than the
thickness of no load-weight of the resistance material. By setting 4, the resistance material can be
compressed to increase the resistance value, and the adjustment of directivity will be determined
by the component size.
They also have the advantage that they can be made in advance as acoustic phase-shifting circuit
blocks that determine directivity, and that their resistance values can be measured and verified
before assembly. Therefore, by using this block, it is possible to provide a directional microphone
that is stable in directivity characteristics, easy to perform automatic assembly and the like in the
same assembly process as a nondirectional microphone, and is inexpensive. Further, as shown in
FIG. 6, this block may include an electrode output terminal portion for deriving an output signal
from the electrode 3. As apparent from the above description, according to the present invention,
the damping material is provided between the two feeders when the two insulators are pressfitted and fitted, so that the resistance f [^ of the acoustic resistance is set. Since the setting can
be accurately made and the adjustment after the assembly is unnecessary, the iron making is
easy.
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