Solid state watch module construction

• US 4,232,512 A
• Filed: 12/22/1977
• Issued: 11/11/1980
• Est. Priority Date: 12/27/1976
• Status: Expired due to Term

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Inventors: Kato, Yoshiaki, Yoshikawa, Kenichi, Umemoto, Toshio, Ichikawa, Singo, Satoh, Tetsuo, Koshikawa, Makoto
• Primary Examiner(s): Miska, Vit W.
• Application Number:
  US05/863,536
• Time in Patent Office: 1,055 Days
• Field of Search: 58/23 R, 58/23 BA, 58/35 W, 58/50 R, 58/88 R, 58/9 B, 361/400, 361/397, 361/398, 361/402, 361/408
• US Class Current: 368/82
• CPC Class Codes: G04G 17/02 Component assemblies
• CPC Class Codes: H05K 1/0284 Details of three-dimensional rigid printed circuit boards H05K1/119 takes precedence; shaping of the substrate H05K3/0014
• CPC Class Codes: H05K 1/182 associated with components mounted in the printed circuit board, e.g. insert mounted components [IMC]

Abstract

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.

Claims

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.

4. A watch module construction according to claim 1, further comprising a battery cathode plate mounted on a bottom wall of said cutout, and a cathode plate supporting column extending from said cathode plate through said plastic body and connected to one of said printed circuit leads, and a positive battery terminal extending through said plastic body and connected to another one of said printed circuit leads.

5. A watch module construction according to claim 1, in which said single plastic body has a display means supporting portion integrally formed therewith.

6. A watch module construction according to claim 5, in which said printed circuit leads terminate at their ends on said display means supporting portion in pectination.

7. A watch module construction according to claim 1, further comprising a battery cover held in place on said second side of said plastic body to protect said battery, and a front case rigidly mounted on said plastic body to cover said first side thereof.

8. A watch module construction according to claim 1, in which said printed circuit leads comprise leads formed by a photochemical process.

9. A watch module construction according to claim 1, further comprising an opaque material layer covering said integrated circuit chip and sealing it in said second cavity.

10. A watch module construction according to claim 1, further comprising an antenna plate provided in said single plastic body and an antenna supporting column extending from said antenna through said plastic body and electrically connected to one of said printed circuit leads to receive a time unit signal from said integrated circuit chip.

11. A watch module construction according to claim 1, in which said single plastic body is formed of a platable grade resin.

12. A watch module construction according to claim 1, in which said single plastic body comprises a platable grade resin and a non-platable resin covering said platable grade resin, said platable grade resin having a plurality of projections having their surfaces exposed in the same pattern as said printed circuit leads.