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JPS5972900

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DESCRIPTION JPS5972900
[0001]
In the present invention, an electret microphone (hereinafter referred to as a microphone) using
an O-polarization charged polymer film, for example, a fluororesin-based film, for an electret
microphone is already known. FIG. 1 shows the cross-sectional structure of the microphone. In
FIG. 1, the polarization-charged polymer film 3, the space ring 4, the back plate 6 provided with
the opening 6 a, the inner case 7, and the terminal plate 8 are surrounded by the front cover 1
via the pressing ring 2. The microphone is configured. The front cover 1 is provided with an
opening 1a, and the sound passes through the opening 1a to vibrate the polymer film 3, and a
signal generated between the polymer film 3 and the back plate 6 by this vibration is a terminal
The signal processing is performed by an electric circuit (not shown) provided on the plate 8 and
the signal is taken out from the terminals 9 and 10 as an electric signal responsive to voice. The
space 11 functions as a resonance box. A characteristic diagram of the microphone shown in FIG.
1 is shown in FIG. From FIG. 2, for example, the sensitivity at a frequency of 300 Hz is about -60
dB. If the above sensitivity is to be improved, the following method can be considered. 0
However, due to the nature in which the electret microphone is used, the external dimensions are
not changed. The first method may increase the surface potential of the polymer film 3. However,
due to the problem of stability of the surface potential-the surface potential can not be raised
beyond the value that makes it possible, and there is a problem that the sensitivity can not be
improved so much. As another method, the space ring 4 may be made thinner and the resonance
space 11 may be made smaller, but the vibration space for the external sound pressure input is
required to have a predetermined size, so it should be smaller than or equal to In this respect as
well, there is a problem that the sensitivity can not be improved so much. The object of the
present invention is to solve the above-mentioned conventional problems based on the concept
of facing two minute (3) pole charging plates opposite to each other across a resonance space
and reversing the polarization charging directions of those polarization charging plates. To
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improve the sensitivity of the electret microphone without changing the external shape 1
dimension of the electret microphone. The present invention is characterized by comprising a
polarization-charged thin plate having predetermined vibration characteristics, and a back plate
provided at a predetermined distance from the thin plate and polarized in the direction opposite
to the thin plate. An electret microphone is provided.
The electret microphone according to the invention is described below. FIG. 3 shows a crosssectional structure of a microphone according to a first embodiment of the present invention. In
FIG. 3, 1 is a front cover, 2 is a pressing ring, 3 is a polarization-charged polymer film, 4 is a
space ring, 5 is a polarization-charged polymer film formed on the surface of the back plate 6, 7
is The inner case 8 is a terminal board, and 9.10 is a terminal. (4) The external dimensions of the
front cover 1, the pressing ring 2, the polymer film 3, the space ring 4, the back plate 6, the
terminal plate 8 and the terminal 9.10 are the same as those in FIG. Compared with the inner
case 7 'of FIG. 1, the inner coossf of FIG. 3 is shorter or equivalent to the thickness of the
polarization charged polymer film 5, but the thickness of the polarization charged polymer film 5
is several tens of ?m The inner case 7 'and the inner case 7 have the same function because the
thickness can be absorbed by the pressing ring 2 and the front cover 1 and the thickness can be
absorbed. it can. Incidentally, the terminal board 8 of FIG. 3 is provided with a not-shown air
passage 17 not shown. The polymer film 3 is formed as follows. In this example, an electrode is
attached to a fluorocarbon resin film, more preferably an FEP (tetrafluorinated ethylene /
hexafluoropropylene copolymer) film by a vapor deposition method or the like, and
predetermined vibration characteristics with respect to external sound pressure input As shown
in the figure, the circumference is fixed to the space ring 4 by applying a predetermined tension
(this fixing is a patent application filed by the present applicant on September 14, 1977 "Electret
element and its manufacturing method And so on)). The adhesive is then dried, the film is cut to
the desired dimensions, polarized and charged, and aged to complete. The polymer film 30
polarization charging can be performed according to Japanese Patent Application No. 56103252 or the like filed by the present applicant. The formation of the polymer film is carried
out prior to incorporation as a microphone. In this example, the polymer film 5 is formed of a
paint containing a fluorocarbon resin such as ethylene tetrafluoride, polyvinylidene fluoride, or
polyethylene tetrafluoride on the surface of the back plate 6 as a layer by printing, spraying,
painting, etc. It is formed and then fixed to the back plate surface by drying, baking or the like.
The back plate 6 on which the polymer film 5 is formed in this manner is polarized and charged
by the Japanese Patent Application No. 56-103252 or the like filed by the present applicant to
form a polarization charged polymer film. Thereafter, a predetermined number of openings 56a
are provided.
The formation of the polarization band adult polar molecule film 5 is performed before
assembling as a microplum. The polarization charged polymer film 3 is charged to the surface
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potential v1, and the polarization charged polymer 11A3 is charged to the surface potential v2 in
the opposite direction to the potential of the polymer film 3. Then, when the sound pressure
input from the outside is constant, the conventionally obtained signal has a magnitude
proportional to vl, whereas that shown in FIG. 3 increases to a magnitude proportional to IVI I +
1 V21. For example, if charging is performed such that 1V11 = 1V2 +, sensitivity twice as high as
that of the conventional one can be obtained. FIG. 4 is a sensitivity characteristic diagram of the
microphone shown in FIG. According to this microphone, at a frequency of 300 Hz, the
conventional sensitivity is 1 6 OdB (Fig. 2), -5 (l d B). FIG. 5 shows a cross-sectional structure of a
microphone according to a second embodiment of the present invention. Compared to the
microphone of FIG. 3, the microphone of FIG. 5 is replaced by the polymer film 3 polarized and
charged in FIG. Used for what was formed. The method for forming the polarization charged
polymer film 32 on the surface of the thin metal plate 31 is the same as the method for forming
the polarization charged polymer film 5 on the surface of the back plate 6 described above. That
is, before assembling into a microphone, a layer is formed by printing, spraying, painting or the
like on the surface of the metal material for diaphragm which is selected so that the resonance
frequency is determined, thickness, and dimensions. It is dried and baked, cut into the shape of a
diaphragm, polarized and charged, and aged to complete. Since the step of attaching electrodes
to the FEP film, the step of applying tension to the FEP film, etc. can be omitted as compared with
the formation of the polymer film 3 because the step of forming can be easily performed in a
short time. When the thin metal plate 31 on which the polarization charged polymer film 32 is
formed is used, the microphone can be manufactured inexpensively while maintaining the same
performance. When the charging condition f of the surface potential is the same as that shown in
FIG. 3 (7), the sensitivity characteristic as shown in FIG. 3 can be obtained. According to the
present invention, it is possible to improve the sensitivity of the electret microphone without
changing the external shape 1 dimension of the electret sotomicrophone.
[0002]
Brief description of the drawings
[0003]
1 is a sectional view of a conventional electret microphone, FIG. 2 is a characteristic view of the
microphone shown in FIG. 1, FIG. 3 is a sectional view of an electret microphone as a first
embodiment of the present invention, FIG. 3 is a characteristic diagram of the microphone shown
in FIG. 3, and FIG. 5 is a cross-sectional view of an electret microphone as a second embodiment
of the present invention.
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(Description of symbols) 1 иии Front cover, 2 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
polarization charged polymer membrane, 4 и и и и и и space ring (8 ) и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Terminal
plate, 9.10 и и и и terminal , 31 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и polarization charged polymer
membrane. Patent Assignee Iwasaki Communication Machine Co., Ltd. Patent Application
Attorney Patent Attorney Aoki Akira Atsushi Nishi Atsushi Nishi Noriyuki Patent Attorney
Yamaguchi Akira Akira Fig. 1 [Fig. 2] [Fig. (Spontaneous) December 1982 S. Secretary General of
Japan Patent Office Kazuo Wakasugi 1. Display of case Patent application No. 182942 No. 2 title
of the invention electret Microphone 3 Relationship to the case for correction Patent applicant
Name (018) Iwasaki Tsushinki Co., Ltd. 4, agent (2 persons outside) 5 correction target (1)
?Detailed description of the invention? column of the specification (2) ?a simple drawing! "Q,
Akira" column (3)-? (Fig. 1, Fig. 3, Fig. 5) 6 Contents of correction (1) a, "Page 5" of the
specification page 2 line 15 "Vibrate. To correct. 2. Correct the "signal" in the 111st page, page 2,
line 17 as follows. "One of the signals is led to the terminal board 8 through the pressing ring 2
and the front cover 1 and the other through the connecting wire 12," c. "Terminal" of page 20 of
the specification. I will add the following later. ", 11 is a resonance space, 12 is a connecting line"
2, "page 11" is added after "10" on page 5, line 3 of the specification. Correct the "space ring 4"
on page 5, lines 19 and 20 of the specification to "pressing ring 2". Then, ?(Japanese Patent
Application No. 57-15875 <S)? is added after the method 1 of the specification, page 6, second
line. To correct "on" in the second line of page 7 of the specification to "on". (2) Add [12...
Connecting lines,] after ?terminals,? on page 10, line 2 of the specification. (3) Correct the
figures in FIG. 1, FIG. 3 and FIG. 5 as attached. Z List of attached documents (Fig. 1, Fig. 3, Fig. 5)
1 Fig. 1 Fig. 3
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