Metal working – Piezoelectric device making
Patent
1989-11-01
1991-02-05
Hall, Carl E.
Metal working
Piezoelectric device making
29883, 29884, 310345, G11B 542
Patent
active
049893025
ABSTRACT:
A piezoelectric buzzer comprising a case having the shape of a bottomed cylinder, a piezoelectric diaphragm fixedly disposed within the case, a cover plate fitted in the open end of the case, and terminals integrally combined with the cover plate and each having one end in contact with the piezoelectric diaphragm and the other end projecting outside from the cover plate. Since the cover plate and the terminals are combined together by insert moldings, no gap is formed between the cover plate and the terminals, no sealing work for sealing gaps between the cover plate and the terminals is necessary, the manufacturing process is simplified, and the piezoelectric element is not exposed to the external atmosphere. A method of manufacturing such a piezoelectric buzzer comprises steps of arranging a plurality of metallic strips for forming terminals in parallel to each other, forming notches in one side of each metallic strip at predetermined intervals, simultaneously forming a plurality of cover plates integrally combined with the metallic strips by insert molding, cutting the metallic strips at predetermined positions between the adjacent cover plates, and bending the metallic strips projecting from each cover plate at the notches to form terminals. The metallic strips can be easily bent at the notches to form the terminals after being combined with the cover plates by insert molding without requiring special work for deciding positions where the metallic strips are to be bent.
REFERENCES:
patent: 4420706 (1983-12-01), Siebold et al.
patent: 4807358 (1989-02-01), Dechelette et al.
Abe Toshio
Kamihara Masaharu
Saito Hitoshi
Suzuki Yasuyuki
Takahashi Seiichi
Hall Carl E.
TDK Corporation
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