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Piezoelectric buzzer
| Details |
Inventors: Abe, Toshio; Takahashi, Seiichi; Kamihara, Masaharu; Saito, Hitoshi; Tanaka, Seizo; Suzuki, Yasuyuki;
Assignee: TDK Corporation (Tokyo, JP)
Primary Examiner: Budd; Mark O.
Assistant Examiner:
Attorney, Agent or Firm: Brumbaugh, Graves, Donohue & Raymond
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 molding, 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. |
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DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a piezoelectric buzzer requiring no work for forming holes in a cover plate and sealing gaps, capable of containing a piezoelectric element in a case in an airtight fashion to prevent the deterioration of the characteristics of the piezoelectric element and the penetration of flux into the interior of the case, and capable of being efficiently assembled.
It is another object of the present invention to provide a method of manufacturing such a piezoelectric buzzer.
In a first aspect of the present invention, a piezoelectric buzzer comprises a bottomed case, a cover plate fitted in the open end of the case, a piezoelectric diaphragm fitted in the case, and terminals in contact with the piezoelectric diaphragm and projecting outside through the cover plate, in which the cover plate and the terminals are formed integrally by insert molding.
In a second aspect of the present invention, a piezoelectric buzzer has a case and a cover plate provided respectively with annular ridges in the respective inner surfaces thereof, and a piezoelectric diaphragm is held between the annular ridges which are in line contact with the piezoelectric diaphragm.
In a third aspect of the present invention, a piezoelectric buzzer has a case and a cover plate respectively provided with annular ridges in the respective inner surfaces thereof, and a piezoelectric diaphragm is held between the annular ridges with an elastic member interposed between the annular ridge of the case and the piezoelectric diaphragm.
In a fourth aspect of the present invention, a piezoelectric buzzer has terminals respectively having curved free ends in contact with a piezoelectric diaphragm.
In a fifth aspect of the present invention, a piezoelectric buzzer has terminals having the shape of a strip, and each terminal has a plurality of longitudinally sequential curved portions in the free end thereof.
In a sixth aspect of the present invention a piezoelectric buzzer has a case and a cover plate, fitting structure consisting of an annular groove formed in the inner surface of the side wall of the case, and a flange formed in the circumference of the cover plate
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