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JPH1169493

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH1169493
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
condenser microphone having an improved fixed structure of a diaphragm.
[0002]
2. Description of the Related Art Condenser microphones are widely used as standard
microphones and precision measurement microphones because they are simple in principle and
can obtain flat and stable frequency response characteristics. In the condenser microphone, due
to its structure, it is necessary to apply a stable tension to the vibrating membrane, so special
attention is paid to this portion.
[0003]
Conventionally, as shown in FIG. 2, the vibrating membrane 100 is in contact with the vibrating
membrane support portion 101 a of the housing member 101 and stretched. The vibrating
membrane 100 is sandwiched between the ring member 102 and the holding member 103 in a
state of being stretched over one end of the ring member 102 in advance. The screw formed on
the inner periphery of the ring member 102 is screwed into the screw formed on the outer
periphery of the housing member 101 to adjust the screwing depth so that a desired tension is
applied to the vibrating membrane 100. ing.
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[0004]
The nut member 104 is screwed to the housing member 101 in order to prevent the loosening of
the screwing between the housing member 101 and the ring member 102. Therefore, the nut
member 104 is screwed into the housing member 101 prior to the attachment of the ring
member 102. Next, the ring member 102 is screwed into the housing member 101 so that a
predetermined tension is applied to the vibrating membrane 100. Then, the nut member 104 is
moved in the arrow direction to push up the ring member 102. As a result, the coupling
relationship between the ring member 102 and the housing member 101 becomes stable and
reliable.
[0005]
However, in the conventional condenser microphone, although the screwing depth of the ring
member 102 is adjusted to give a predetermined tension to the vibrating membrane 100, the
ring member 102 is pushed up by the nut member 104. Therefore, there is a problem that the
tension of the vibrating membrane 100 is changed. In order to solve such a problem, the
screwing depth of the ring member 102 is made deeper in anticipation of the change in tension
due to the nut member 104. In such work, there are many parts that rely on the intuition of the
worker, so there is a problem that standardization of the work is difficult and it takes many manhours.
[0006]
The present invention has been made in view of such problems in the prior art, and the object of
the present invention is to simplify the assembly and easily provide the vibrating film with a
desired desired tension. It is an attempt to provide a condenser microphone.
[0007]
SUMMARY OF THE INVENTION In order to solve the above problems, according to the present
invention, a screw is formed on the inner peripheral surface of a housing member having a screw
formed on the outer peripheral surface, and a vibrating film is fixed to the open end. In a
condenser microphone in which a ring member is screwed and a vibrating membrane support
portion of the housing member abuts against the vibrating membrane to apply a predetermined
tension to the vibrating membrane, the outer peripheral portion of the housing member is
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tapered. When a thin portion is formed on the ring member and the ring member is screwed to
the housing member, the thin portion is in pressure contact with the outer peripheral portion of
the housing member.
[0008]
It is preferable to form a slit in the thin portion.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the attached drawings.
Here, FIG. 1 is a front view of a partial cross-sectional view of a condenser microphone according
to the present invention.
[0010]
As shown in FIG. 1, the condenser microphone according to the present invention includes the
housing member 1, the ring member 2, the vibrating membrane 3, the holding member 4, the
back electrode member 5, the insulating member 6, the washer 7, the buckling 8, the electrode 9
and the like. It consists of
[0011]
The housing member 1 has a substantially cylindrical shape, and has a plurality of stepped
portions on the inner peripheral portion and the outer peripheral portion.
The upper end of the housing member 1 is formed with an edge (a vibrating membrane
supporting portion) 1 a for supporting the vibrating membrane 3.
Further, an external thread 1 b is formed on the outer peripheral surface from the upper end to
the predetermined portion.
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Further, the outer peripheral portion 1c on the lower side of the male screw 1b is formed in a
tapered shape.
[0012]
The ring member 2 has a cylindrical shape and has a thin portion 2a at one end. Further, a
plurality of slits 2b in the vertical direction are formed in the thin portion 2a. Further, on the
inner peripheral surface of the ring member 2, a female screw 2c to be screwed with the male
screw 1b of the housing member 1 is formed.
[0013]
The vibrating film 3 is formed of, for example, a foil such as titanium or stainless steel. The
holding member 4 is formed by opening a hole in a closed portion of a flat cylindrical member
whose one end is closed. The ring member 2 and the holding member 4 are made of metal.
[0014]
To assemble the vibrating membrane 3, first cover the upper end opening of the ring member 2
with the vibrating membrane 3, place the holding member 4 on it, and sandwich the vibrating
membrane 3 between the ring member 2 and the holding member 4 to form the vibrating
membrane 3. Hold An adhesive may be filled between the ring member 2 and the holding
member 4 as needed.
[0015]
The operation of the condenser microphone configured as described above will be described. The
ring member 2 in which the vibrating membrane 3 is fixed to the upper end opening portion by
the holding member 4 or the like is screwed to the housing member 1 in which the back
electrode member 5, the insulating member 6, the washer 7, the back ring 8 and the electrode 9
are assembled in advance. Match. Here, since the vibrating membrane 3 is pushed up by the
vibrating membrane support portion 1 a of the housing member 1 as the screwing depth of the
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ring member 2 with respect to the housing member 1 is deeper, the tension acting on the
vibrating membrane 3 becomes larger.
[0016]
How much the screwing depth is to be made, that is, how much tension is applied to the vibrating
membrane 3 depends on the DC voltage between the vibrating membrane 3 and the housing
member 1 by an external DC power supply (not shown). Under the applied condition, the
microphone is given a sound pressure whose frequency and sound pressure level are known to
monitor the frequency characteristic of the sensitivity of the microphone. Specifically, whether or
not the tension applied to the vibrating membrane 3 is appropriate by monitoring whether or not
the peak of the frequency characteristic of the sensitivity caused by the resonance of the
vibrating membrane 3 falls within a predetermined frequency range To judge.
[0017]
When the ring member 2 is screwed into the housing member 1, each piece of the thin portion
2a divided by the plurality of slits 2b of the ring member 2 is applied to the tapered outer
peripheral portion 1c of the housing member 1 with a predetermined force. It comes in pressure
contact. That is, the thin portion 2 a is elastically fitted to the tapered outer peripheral portion 1
c of the housing member 1. Accordingly, there is no need for a separate member for achieving
the stability of screwing between the housing member 1 and the ring member 2, for example, the
nut member 104 for preventing loosening which is required for the conventional condenser
microphone.
[0018]
In the above-described embodiment, the case where the plurality of slits 2b are formed in the
thin portion 2a of the ring member 2 has been described. However, the present invention is not
limited to this, and the thickness of the thin-walled portion 2a of the ring member 2 may be
further reduced and a slit may not be provided. Also in this case, the thin-walled portion 2a of the
ring member 2 is elastically fitted with the tapered outer peripheral portion 1c of the housing
member 1, so that the same operation and effect as the case where the slit 2b is formed are
exhibited.
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[0019]
Further, in the above-described embodiment, the case where the present invention is applied to a
condenser microphone of a system in which a DC bias voltage is externally supplied is described.
However, the present invention is not limited to this, and can also be applied to a so-called
electret condenser microphone in which an electret film is disposed on the surface of the back
electrode member facing the diaphragm.
[0020]
As described above, according to the present invention, the tension adjustment of the vibrating
membrane can be performed more easily simply by screwing the ring member into the housing
member.
[0021]
In addition, if a slit is formed in the thin-walled portion of the ring member, the range of choices
for the fitting strength between the housing member and the ring member can be expanded.
[0022]
Brief description of the drawings
[0023]
1 is a front view of a partial cross-sectional view of a condenser microphone according to the
present invention
[0024]
Fig. 2 Front view of a partial sectional view of a conventional condenser microphone
[0025]
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 1 ... Housing member, 1a ... Edge (vibrating film support part), 1b ...
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Male thread, 1c ... Outer peripheral part of a housing member, 2 ... Ring member, 2a ... Thin part,
2b ... Slit, 2c ... Female screw, 3 ... Vibrating film, 4 ... holding member, 5 ... back electrode
member.
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