Metal working – Method of mechanical manufacture – Electrical device making
Patent
1980-10-10
1983-02-08
Husar, Francis S.
Metal working
Method of mechanical manufacture
Electrical device making
29413, 294261, 29846, 174 685, H01K 310
Patent
active
043720463
ABSTRACT:
A circuit board, for an electronic timepiece, having a switching electrode formed on a narrow peripheral surface of the circuit board. The narrow peripheral surface has a pair of spaced indentations, and the switching electrode is comprised of a metallic layer disposed on the indentation surfaces and on the portion of the narrow peripheral surface between the indentations. The switching electrode is fabricated by forming a pair of spaced small holes through a circuit board base plate, and by forming a large hole having a diameter greater than a distance between the pair of small holes and positioned for intersecting the pair of small holes. A conductive layer is plated on the surfaces defining the pair of small holes and on that portion of the surface which defines the large hole that is between the pair of small holes. The final shape of the circuit board is then press cut from the circuit board base plate along a line of cutting which passes through the pair of small holes and the large hole so that the conductive layer is disposed on a portion of the narrow peripheral surface of the finished circuit board having a pair of indentations corresponding to the pair of small holes, and the conductive layer defines a switching electrode.
REFERENCES:
patent: 2926340 (1960-02-01), Blain et al.
patent: 3531581 (1970-09-01), Chesemore
patent: 3780431 (1973-12-01), Feeney
patent: 3964087 (1976-06-01), Mallon
IBM Tech Discl Bull., vol. 5, No. 5, Oct. 1962, p. 24, by S. M. Meiboom.
Adams Bruce L.
Arbes Carl J.
Burns Robert E.
Husar Francis S.
Kabushiki Kaisha Daini Seikosha
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