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JPS609300

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DESCRIPTION JPS609300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrostatic electroacoustic transducer, and more particularly to an improvement of a vibrating
electrode used in an electret electrostatic electroacoustic transducer. [Conventional technology
and its problems] The electrostatic electro-acoustic transducer is a vibrating electrode that
vibrates when acoustic energy or electrostatic energy is given from the outside, and also receives
external acoustic energy or electrostatic energy. The fixed electrode which does not vibrate and
the spacer for keeping the interval between the fixed electrodes of the vibrating electrode
constant are constituted as main parts. The resonance frequency of the vibrating electrode used
in the electro-mechanical transducer, not limited to the electrostatic electro-acoustic transducer,
directly affects the frequency characteristics of the electro-mechanical transducer. The resonant
frequency of the vibrating electrode It is desirable not to change with time, but to keep the
resonance frequency constant even if changes in humidity and temperature occur. However, a
normal electret electrostatic electroacoustic transducer in which a snacks film provided with an
electrically conductive layer on one side is electretized to form a vibrating electrode or a
plasticized electretized film is used on the fixed electrode side In a so-called pack electret type
electrostatic electroacoustic transducer using a plastic film provided with an electrically
conductive layer on one side as a vibrating electrode material, any of the plastic films forming the
vibrating electrode However, due to the moisture absorption, the resonance frequency of the
vibrating electrode is significantly reduced due to the moisture absorption, resulting in the
deterioration of the characteristics of the electroacoustic transducer. As a technique for solving
the problems as described above, in Japanese Patent Application Laid-Open No. 48-61128, the
electroacoustic conversion is carried out by using a hygroscopic shrinkable film to drive the
periphery of an electretized hygroscopic relaxing film as a vibrating electrode. An apparatus is
disclosed. As is well known, in order to keep constant the resonance frequency of the vibrating
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electrode fixing the peripheral portion of the thin film, it is necessary to keep constant tension
applied to the film, as disclosed in JP-A-48-61128. For practical use of the technology, it is
extremely difficult to identify the combination of the hygroscopic relaxation film and the
hygroscopic shrinkable film, and a complicated process of lining the periphery of the
hygroscopic relaxation film with the hygroscopic shrinkage film is required. Furthermore, there is
a disadvantage such as an increase in the mass of the vibrating portion. In addition, single-sided
metallized polyethylene tele 7 tally film, which is currently used as a vibrating electrode material
for pack electret condenser microphones, which are the most popular of the pack electret type
electrostatic electroacoustic transducers. In the microphone operating temperature range, it
shows relaxation when the humidity becomes high, and when the relative operating temperature
of the microphone is exceeded and the relative humidity is high, for example, it shows
contraction in the atmosphere of 60 ° C and 95% relative humidity. The inventors of the present
invention measured the resonant frequency of the vibrating electrode and the microphone that it
is unsuitable to use as a vibrating electrode material of an electrostatic electroacoustic
transducer without processing a single-sided all-opened polyethylene terephthalate film. It was
discovered by the characterization test of
OBJECTS OF THE INVENTION The present invention does not degrade its characteristics in the
normal operating environment of an electrostatic electroacoustic transducer, and may also be
encountered during storage and transportation of the electrostatic electroacoustic transducer. It
is an object of the present invention to provide an electrostatic electroacoustic transducer whose
characteristics do not deteriorate even under severe environmental conditions by improving the
vibrating electrode. [Summary of the Invention] The electrostatic electroacoustic transducer
according to the present invention is a transducer using a thin film material provided with a
conductive thin film layer on at least one side of a dielectric thin film as a vibrating electrode
material, Both main surfaces of the vibrating electrode material are coated with a water repellent
material. A single-sided metallized plastic film or double-sided metallized glasstex film, which is
practically used as a vibrating electrode material for ordinary electrostatic electroacoustic
transducers, is held by a pair of vibrating membrane stretching frames and then vibrated. The
conventional method of fixing the electrically conductive ring for fixing the vibrating electrode to
the metallized surface of the film in a state of being placed on the membrane stretching table and
removing the wrinkles in the film surface by the weight of the vibrating membrane stretching
frame. The vibrating membrane 1 pole of the shape shown in FIG. 1 is obtained. Next, the shape
shown in FIG. 1 in a solution in which a water repellent material such as silicone oil, silicone
resin, fluorine-based surfactant, solvent-soluble fluorine-based oil and solvent-soluble fluorinebased resin is dissolved in a removable solvent After immersing the vibrating electrode, a thin
removable thin film layer is provided on both major surfaces of the vibrating electrode material,
which is withdrawn from the solution. The vibrating electrode for electrostatic type
electroacoustic transducer thus obtained exhibits a constant resonance frequency under a normal
temperature and humidity environment where the electrostatic type electroacoustic transducer is
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used, and the temperature is 60 ° C. relative The humidity is adjusted to 95%, and after standing
in a constant temperature and humidity chamber for a whole day and night, if the temperature is
returned to normal temperature and humidity, the common frequency returns to the original
value. The vibrating electrode of the electrostatic electroacoustic transducer of the present
invention in which the main surfaces of both the above-mentioned black <and conventional
vibrating electrodes are surface-treated to impart water repellency is not relaxed by the humidity
in the air and also relaxed. However, the characteristics of the electrostatic electroacoustic
transducer using the vibrating electrode according to the present invention can always be kept
constant in the practical state, since the original state is promptly restored under normal
temperature and normal humidity. [Effects of the Invention] According to the present invention,
without using an expensive metal foil such as titanium foil as a vibrating electrode material, and
without going through complicated processes such as superposing a hygroscopic relaxing film
and a hygroscopic shrinking film. It is possible to obtain a vibrating electrode which does not
shrink or shrink even if the humidity changes as the inexpensive electrode material made of
plastic film usually used for the vibrating electrode material, and the characteristics are stable.
Electrostatic type crane and air acoustic transducer can be manufactured at low cost.
Further, the water repellent material used in the present invention not only prevents the
moisture absorption of the plastics used as the vibrating electrode constituent material, but also
aluminum or chromium provided for the purpose of providing an electrically conductive layer on
the plastic film surface. Alternatively, it has the effect of preventing corrosion of the nickel seed
layer, such as Nikke / l /. [Examples of the Invention] Example 1 A 4 μm thick polyethylene
terephthalate film provided with a Ni-Cr alloy thin film in a thin layer using a vacuum deposition
apparatus as an electrically conductive layer on one side L, outer diameter 5 A true-made
vibrating electrode fixing ring having an inner diameter of 3.5 mm was fixedly integrated with
the Ni-Cr vapor-deposited surface using an electrically conductive adhesive. The electrically
conductive adhesive used is a two-pack type epoxy adhesive K4 and is obtained by dispersing
carbon fine particles and fine particles of graphite, and it is made of Ni-Cr deposited on one side
of polyethylene terephthalate and a Shinshu vibration The electrode fixing ring was firmly fixed.
20 vibrating electrodes of the shape shown in FIG. 1 were manufactured by the above-mentioned
operation, and 10 of them were toluene-dissolved with water repellent silicone oil (TSF-484 trade
name, Toshiba Silicone (manufactured by WA)) After immersion in the solution, it was withdrawn
from the solution and the vibrating electrode was coated with a water repellent silicone oil. The
concentration of the silicone oil used was 1.0% and no oil droplets were observed on the
vibrating electrode even after the toluene was volatilized, and the vibrating electrode was
covered with a water repellent silicone oil film. As described above, the ten vibration electrodes
for the electrostatic electroacoustic transducer according to the present invention, in which the
entire surface of the vibration electrode is coated with the water repellent silicone oil, and the
remaining vibrations not surface-treated with the water repellent silicone oil. When the
resonance frequency of 10 electrodes was determined, as shown by curve A in FIG. 2, the
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resonance frequency of the vibrating electrode according to the present invention was released
during high temperature and high humidity (it is relatively stable even after that. On the other
hand, in the conventional example, as shown by curve B in FIG. 2, the resonance frequency was
significantly increased. Example 2 Fluororesin-based water repellent FC-90'5 (US MINESOTA
MINING AND MFG) on both sides of a vibrating electrode as shown in FIG. 1 manufactured using
the same material as Example 1. Co1.1) 1.1.1. After spray coating of 10% solution of chlorethane,
heat treatment was performed at 80 ° C. for about 3 hours. The resonant frequency of the
obtained vibrating electrode was found to be relatively small even after being left in a highhumidity atmosphere as a result of the same tests as in Example 1. Example 3 In place of the
polyethylene terephthalate film on which Ni-Cr alloy is vapor-deposited on one side used in
Example 1 and Example 2, a polyethylene terephthalate film (4 mm thick Me) on which
aluminum is vapor-deposited is used The vibrating electrode was coated with a water repellent
fluorine resin in the same manner as in Example 2 except for the above.
The resonant frequency of the obtained vibrating electrode shows little change even after being
left in a high temperature and high humidity atmosphere, and the aluminum nitride film
deposited after being left for 1 week in a 60 ° C. relative humidity 95% atmosphere is corroded.
It was not. Example 4 A polyethylene terephthalate film having a thickness of 2.5 μm and an
outer diameter of 5 mm and an inner diameter of 3. A vibrating electrode fixing ring of 5 m
manufactured by Seirin Co., Ltd. was used to obtain a vibrating electrode for an electrostatic
electroacoustic transducer of the shape shown in FIG. A fluorine resin-based water repellent FC905 was coated on the entire surface of the obtained vibrating electrode in the same manner as
in Example-2. The resonance frequency of this vibrating electrode is 5.5 KHz, and as shown by
curve A in FIG. 3, the resonance frequency is kept constant even if the relative humidity changes,
but a fluorine resin-based water repellent agent As shown by curve B in FIG. 3, the resonant
frequency of the vibrating electrode not subjected to the coating treatment significantly
decreased with the increase in relative humidity. As mentioned above, although the
implementation method of the present invention and a specific example were shown, the same
effect as Example 4 is obtained even with the 60 mm diameter electret-capacitor type headphone
vibrating electrode obtained in the same manner as Example 4. It is obtained. Further, the
present invention is intended to improve the vibrating electrode for electrostatic type
electroacoustic transducer, but a transducer using a material having vibration absorbing property
as a component of the vibrating portion, for example, an electromagnetic speaker, carbon, etc.
The present invention can also be applied as a method for improving cone paper and a method
for improving a polyester diaphragm also in a microphone or the like.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a cross-sectional view showing an example of a vibrating electrode for an electrostatic
electroacoustic transducer used in the present invention, FIG. 2 is a graph showing an example of
the implementation effect of the present invention, and FIG. The graph which shows an example
of the implementation effect.
1 ... polyethylene terephthalate, 3 ... conductive adhesive, 2 ... Ni-Cr deposited film, 4 ... fixed ring.
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