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Solid-state-watch-module-construction

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Solid state watch module construction

Details

Inventors: Yoshikawa, Kenichi; Koshikawa, Makoto; Umemoto, Toshio; Satoh, Tetsuo; Ichikawa, Singo; Kato, Yoshiaki;
Assignee: Citizen Watch Co., Ltd. (Tokyo, JP)
Primary Examiner: Miska; Vit W.
Assistant Examiner:
Attorney, Agent or Firm:

A solid state watch module construction including a plastic substrate and an electro-optical display cell directly mounted on the substrate. The substrate has an integrated circuit chip on one side thereof, and a plurality of printed circuit leads connected to electrical terminals of the integrated circuit chip. The electro-optical display cell has a plurality of electric terminals formed in rows in alignment with terminal ends of said printed circuit leads. The electro-optical display cell is bonded to the one side of the substrate and the electric terminals of the display cell are bonded to the terminal ends of the printed circuit leads.

DETAILED DESCRIPTION What is claimed is: 1.
A watch module construction comprising: a single body of plastic material serving as a substrate and a baseplate, said single plastic body having formed on a first side thereof, a first cavity having a bottom and a second smaller cavity formed in the bottom of said first cavity with a stepped wall formed by said cavities on said first side of said single plastic body; a plurality of printed circuit leads directly formed on said stepped wall by a printing technique, and an integrated circuit chip directly mounted in said second cavity on said first side of said single plastic body, said integrated circuit chip having electrical terminals connected to said printed circuit leads and adapted to provide drive signals; and an electro-optical display means mounted in said first cavity in said first side of said single plastic body and having electrode patterns adapted to provide a display of characters on a viewing surface thereof, said display means having a plurality of electrical terminals connected to said electrode patterns, said electrical terminals of said display means being electrically connected to said printed circuit leads to provide an electrical connection therebetween whereby said display means receives said drive signals from said chip to provide a time indication by means of said electrode patterns; said single plastic body having a cutout formed on the opposite second side thereof for receiving a battery, and serving as a back cover of a watch.
2.
A watch module construction according to claim 1, in which said stepped wall is continuous with said bottom wall of said first cavity.
3.
A watch module construction according to claim 2, in which said plurality of printed circuit leads comprise first printed circuit leads extending between said bottom wall of said first cavity and said stepped wall, and second printed circuit leads formed on said stepped wall and connected to said first printed circuit leads and said integrated circuit chip

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