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JPS5132592

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DESCRIPTION JPS5132592
■ Method of manufacturing an electroacoustic transducer ■ Appl. No. 41-2250 ■ Japanese
Patent Application No. 38-55742 [Phase] Application No. 38 (1963) October 19 @ Inventor
Yoshida Yuji □ Tokyo Tokyo Minamitama County Hino Town Hino 5667 @ Application
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of
manufacturing an electroacoustic transducer including a speaker and a microphone. Metal parts
such as plates, yokes, and frames that make up magnetic circuits of speakers, microphones,
pickups, and other acoustic parts that are currently commercially available are the most iron
materials, and are painted, galvanized, and cadmium plated because they need long-term
anticorrosion. Plating is generally applied, and the bonding method of each part is an organic
adhesive. Electric arc welding, spot welding and mechanical nine-vent welding are used. In
particular, with regard to domestic products, in order to further ensure rust prevention on the
surface to which zinc plating and unichromate treatment have been applied, lacquer coating etc.
are often applied. The present invention seeks to provide a method of manufacturing an electroacoustic transducer which can be easily assembled, omitting the above-mentioned many steps.
The invention will now be described by way of example. Example 1 Among the parts for the
present acoustic device such as a plate, a frame, etc., all to be plated are tin-plated as follows. As
electrolyte solution, stannous sulfate 55? / 1 free sulfuric acid 60? / L cresol null acid 100?
Using 1 l / l [111111] β-naphthol 11 / l gelatin 2 g / l, plate the time until the required
thickness is obtained at a temperature of about 30 ° C. Next, tin-plated parts are plated with
lead. As an electrolytic solution, basic lead carbonate (PbCO 3) · Pb (marks) 2300 is t 50%
hydrofluoric acid HF 280 μphosphoric acid H 3 BO 32 12 P /! Using a steel plate 7'd 0, 2 to 0.5
汐 Z, a temperature of 30 ° C., and for a period of time, apply a lead plating to achieve the
required thickness. The thickness of tin and lead can be varied by adjusting the respective plating
times. Immerse each one of the parts needed for the electroacoustic transducer thus plated in
two layers in a flux such as zinc chloride, rosin alcohol solution, etc., and after drying, through
the necessary tools, Assemble into the required structure and heat it in a 150 to 300 ° C. power
n furnace. In that case, the tin and lead plating layers are mutually alloyed, and at the same time,
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the portions joined with the existing adhesive rivets, such as the frame and the yoke, are joined
through the solder. Likewise, the joining points of the current electroacoustic transducer
assembly system can be joined in one step according to the invention.
Example 2 as an electrolyte. Snイオン10∼55? /1r−7o’? In the same manner as in
Example 1 in a tin-lead alloy plating bath adjusted to 90-25171 g / l at 25 g / l, plating and
heating in the same manner as in Example 1 to obtain a solder alloy crystal system. The joint part
is joined in one behavior with the alloy electrolytic plated solder which has been obtained. As
described above, since the electroacoustic transducer according to the present invention
separately applies silver plating and lead plating or tin-lead alloy plating to parts separately,
assembles, heats, and is integrally connected, Combine parts into [111111] EndPage: 1
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