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■ Vibratory film holding of electrostatic type electroacoustic transducer, tension method 特 願
Japanese Patent Application No. 45-824.28 [phase] Application No. 45 (1970) Sept. 20 @
inventor Shimizu sound collecting Machida vehicle height slope 212 ◎ Applicant Shimizu
Takashi (at the applicant, the right is ready to be assigned)
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a central longitudinal sectional view showing a
vibrating film holding and tensioning structure of a conventional electrostatic electroacoustic
transducer, FIG. 2 is an enlarged view of a vibrating film holding portion, FIG. c is a schematic
diagram showing the vibrating film formation process according to the method of the present
invention, and FIG. 4 is the vibrating film produced by the method of the present invention? It is
a center longitudinal cross-sectional view which shows the vibrating film holding | maintenance
of the electrostatic type electroacoustic transducer used and the tension | tensile_part which
were used.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
holding a vibrating film of an electrostatic electroacoustic transducer and a method of tensioning.
In a conventional electrostatic electroacoustic transducer, as shown in FIG. 1, a conductive thin
film adhered and fixed to a tension frame 2 is pressed and fixed to a housing 1, and a tension
frame 6 is used to tension a diaphragm 3 The vibrating membrane produced by the above
method based on the structure giving the core is not reliable enough in bonding and fixing, is
applied as a concentrated stress without being given a uniform tension in the tension process,
and is partially permanent. It is thought that there are many things that remain as distortion. The
method of the present invention is proposed as a method of obtaining a uniform tensiontensioned vibrating membrane in which the above problems are solved and which is ideal in
electroacoustic vibrometry [1111111. According to the embodiment of the present invention,
according to the embodiment, the electrolytic plating of chromium is performed on one surface
of a copper plate which is a vibration (one frame 11 for holding frame. Since the plating
thickness is the thickness of the vibrating film 12 here, it is necessary to electrolytically weld
until a plating layer of a required thickness is formed. If copper is corroded with a ferric chloride
solution of Group 1-1 in this chrome-plated copper plate with the mask 13 in the part to be the
peripheral support frame, the copper maintenance frame and the tensioned chrome film are can
get. The present invention? For industrial production, it will be obtained as a more uniform
product by photo corrosion method, electroforming method, etc. The vibrating membrane
obtained by the method of the present invention realizes a vibrating membrane which is
stretched by uniform tension at a circular periphery which is ideal as a circular membrane in
electroacoustic vibration when the holding frame is circular. The point is that it can be easily
determined from pure physical-chemical generation without giving any mechanical deformation
or stress in this generation process. If reference is made to the drawings here, the reference
numeral 5 in FIG. 1 indicates a pressing NAND, FIG. 2 indicates an adhesive, and FIG. In FIG. 4, 21
indicates housing, 22 indicates a peripheral holding frame, 23 indicates a vibrating membrane,
and 25 indicates a pressing NAND.
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