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JPS5417830

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DESCRIPTION JPS5417830
Title: Method of manufacturing electrostatic type transducer A process of depositing a thin layer
of fluorine resin having heat fusion property on a stretched surface of a diaphragm ring made of
metal, and the above diaphragm through the thin layer 7. A method of manufacturing an
electrostatic transducer, comprising stretching a diaphragm by pressure-adhering and heatadhering a resin film for electret diaphragm to a ring.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
manufacturing a transducer applied to an electrostatic speaker, a microphone or the like, and in
particular, a novel device is applied to the stretching means of the electret-diagram. First, with
reference to FIG. 1, an example of the basic structure of this type of transducer capsule will be
outlined. In the figure, (1) is a capsule as a whole, an imaginary line (2) is an insulating material
assembly for assembly, f31 (3a-3b) is a pair of flanges disposed therein, and (41 (4a, 4b) Is a
counter flat plate having a large number of apertures, ie, back electrodes parallel to each other,
attached to the flange 7 flange, (5) is a monocharge electret diaphragm + le + (5a-6b) stretched
between them. A diaphragm ring (metal ring) for holding the diaphragm in a stretched state is
shown, and such a transducer is disposed between the back electrode plate (4) via a drive signal
source (7; more transformer (not shown)). A signal voltage is applied, a push-pull operation gold
is applied to the diaphragm (5), and a radiation plate pressure is obtained from the opening of
the back electrode plate (41). By the way-as a material of the above-mentioned diaphragm, it is.
In general, a fluorocarbon resin-based fluorocarbon-ethylene-propylene (FEP) film or a laminate
film of this FEP and tetrafluoroethylene (TFg) is widely used because it is excellent in terms of
the electrical characteristics as the electret and its stability. There is. Also, these films have the
great advantage of being easy to thermally bond to the diaphragm ring, and without using any
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special adhesive material, the thermal conductivity of + PEP can be achieved by simply pressing
it on a heated ヤ ring ring at about 300 ° C. EndPage: The above-mentioned laminated film can
be stretched depending on the meltability. However, on the other hand, it is extremely difficult to
produce these films uniformly and thinly-in the case of either FEP single film or laminated films
of TFE and FEP with approximately 6μ as the limit of its thickness. It is desirable to stretch a
film thinner than 6μ, if possible, because the diaphragm of an electro-conductive transducer can
improve the sound quality in the upper range as it becomes thinner. Therefore, in order to meet
this requirement, in recent years, there has been developed a technology for manufacturing the
film as a uniform thin film of about 3 μ thickness only for TFE. The electrical properties of TFE
as an electret are as good as those of FEP, so it can function well for electrostatic transducers.
However, unlike FEP, its problem is that heat fusion is almost impossible. There are also several
ways to impart adhesion to the surface of TFE, although they do not allow adhesion with
conventional adhesives, but they require dangerous special reagents.
Alternatively, it is often a means of damaging the diaphragms and is therefore not suitable for the
manufacture of this vaginal transducer. Further, another different method will be described with
reference to FIG. 2. This corresponds to the surface of the TFE diaphragm (8) of about 3 .mu.
Metal deposition II f 91 such as aluminum and stainless steel is applied, then the adhesive fltl is
applied to the surface of this deposition @ (9), and then the corresponding parts of both sides are
crimped to form a diaphragm of 1 'rl I' g Diaphragm (8) It is a stretching method of adhering to
the surface of the ring (6). However, this method also requires a deposition apparatus capable of
achieving a high negative pressure, and of course, it takes considerable man-hours to carry out
masking for forming the deposition layer (9). As a conclusion, there are difficulties in mass
productivity. SUMMARY OF THE INVENTION The object of the present invention is to solve each
problem such as one or more, and a novel means capable of simply and reliably stretching a Tl]
13 diaphragm of about 3 μ thickness on the surface of a specific KFi metal diaphragm ring.
There is a suggestion. FIG. 3 is a diagram for explaining the present invention, and the basic idea
thereof is first to a fluorine resin having thermal fusion bondability to the stretching surface of
the conventional m-like metal diaphragm ring + 61, ie, the above-mentioned FHP or A thin layer
such as (perfluoroalkoxy) or dichroic, neoclone (all are part names), etc. (hereinafter referred to
as 'EP'), and this FEP (111 as a vibrating film on the surface of the film! 'G Diaphragm (arranged
with 81'. Finally, the TFB diaphragm (8;) and the diaphragm ring (6) are pressure bonded
thermally. The thickness of the TP'E diaphragm (8) is, for example, 3 .mu., That is, it is easy to
thermally fuse (-FF, P and metal as described above), and TFE K vs. FBP. It can be said that the
property that can be heat-fused is utilized cleverly. Next, the steps in practicing the present
invention will be described. As a method of depositing the thin MP layer Q11 onto the diaphragm
ring i61, which is the first step. (1) Bake coating of f ′ ′ BP emulsion (B) Electrostatic coating
and baking of FEP powder (1) Pressure heat bonding etc. of FEP film, method (]) is to apply a
water emulsion of FEP fine particles After drying treatment, * g is applied at a temperature of
285 ° C. to 295 ° C., which is the melting point of $ '-)' Ep. Also, (previously, a negative
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potential is applied to the fine powder of FEP, and a positive potential is applied to the side of the
diaphragm ring so as to be electrostatically coated, and firing is performed under the same mdegree conditions as in 1).
Further, (1) is to pressure-heat-bond the FEP film to a diaphragm ring which has been previously
heated at 285 ° C. to 295 ° C. or higher. In addition, when the temperature of the diaphragm
ring is set to 350 ° C. to 400 ° C. in the case of adopting this method, the FBP film is melted
and cut by the inner and outer peripheral edges of the ring. FEP remains and fuses only on the
ring surface. The second step is the pressure heat bonding of the Tk'E film as described above,
which can be easily stretched as a diaphragm by diverting the conventional method. The
temperature condition is set to the melting point (285 ° C. to 295 ° C.) of FEP or more and the
melting point (327 ° C.) of −′rl ′ ′ P. As described above, according to the present
invention, as an electret diaphragm in this type of transformer EndPage: 2 deuter, an extremely
thin film made of TFP or similar resin which can greatly improve the electrical characteristics
and acoustic characteristics etc. of the diaphragm ring It is possible to simply and rationally build
on the tension surface of the core, and it is possible to expect excellent effects in mass
production, as well as to contribute to the improvement of the overall performance of the
transducer, especially the high frequency range sound quality. Is a great deal. In addition, in the
case of the diaphragm tension made by attaching resin thin layers other than FEP to the tension
surface of a diaphragm ring, the foot temperature of each process is determined experimentally,
for example.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an essential part
showing the basic structure of an example of an electrostatic transducer, and FIG. 2 is a view for
explaining an example of a conventional diaphragm stretching means. FIG. 3 is a diagram for
explaining the method according to the present invention. In the figure, (4) indicates a back
electrode plate, (5) and (5) an electret diaphragm (81), and (6) a metal diaphragm ring + QD a
heat fusible fluororesin thin layer. Agent 9 Fujishima EndPage: 3
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