Process for producing solar-cell watch dial

Details Process for producing solar-cell watch dial Process for producing solar-cell watch dial

1998-12-11

2000-08-08

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Nonresinous material only

264654, 264662, 264663, B29D 1100, G02B 100

Patent

active

060997613

ABSTRACT:
A solar-cell watch dial to be disposed on or above a solar cell housed in a watch, the solar-cell watch dial including an alumina of the formula Al.sub.2 O.sub.3 whose purity is at least 99.90% and exhibiting a light transmission ranging from 40 to 60%. The invention also includes a process for producing a solar-cell watch dial, which includes the steps of: mixing together an alumina of the formula Al.sub.2 O.sub.3 whose purity is at least 99.90%, an organic binder and water to thereby obtain an Al.sub.2 O.sub.3 mixture (A); drying and granulating the Al.sub.2 O.sub.3 mixture to thereby obtain a granular material (B); molding the granular material into a plate dial precursor (C); firing the dial precursor at 700 to 1500.degree. C. in atmospheric environment to thereby obtain a preliminary firing product (D); and firing the preliminary firing product at 1500 to 1800.degree. C. under a pressure of 1.times.10.sup.-2 to 1.times.10.sup.-5 torr for 1 to 10 hr to thereby obtain a solar-cell watch dial (E). The solar-cell watch dial of the present invention enables preventing the solar cell from being sighted from outside without hindering the supply of light energy to the solar cell.

REFERENCES:
patent: 4948538 (1990-08-01), Wei et al.
patent: 4968459 (1990-11-01), Serntz
patent: 5242298 (1993-09-01), Sernetz
patent: 5627116 (1997-05-01), Zuk
patent: 5761158 (1998-06-01), Azuma et al.
Japanese Patent Publication No. 56163266 Abstract, Dec. 15, 1981, 1. p., English-language.
Swiss Patent No. 522 247, Nov. 30, 1971, page 1 only, Swiss language.

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