Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1987-12-04
1989-01-10
Powell, William A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
65 31, 156643, 156646, 156657, 1566591, 156653, 156663, 20419237, 369279, 428170, 430321, 430323, B32B 328, B44C 122, C03C 1500, C03C 2506
Patent
active
047973161
ABSTRACT:
The invention relates to an article comprising a glass sheet and having an etched pattern, and to a process of manufacturing an article comprising a glass sheet and having an etched pattern.
The glass sheet 11 is a chemically tempered glass sheet, and the pattern comprises one or more grooves 10 etched into the article using fluorine ions to a depth of less than 2 .mu.m. The etched grooves 10 constituting the pattern may be formed in a layer 12 of inorganic material such as SiO.sub.2. They may have a width of less than 10 .mu.m and the spacing (p) between two adjacent grooves may also be less than 10 .mu.m.
The etching may be performed by applying a layer of radiation-sensitive material to at least one face of that sheet and exposing it to radiation to form a latent image of a desired groove pattern, whereafter the radiation-sensitive material is developed to form a resist and the sheet is exposed, through the resist, to the action of fluorine ions in an etching medium to etch the desired groove pattern to a depth of less than 2 .mu.m.
The invention is particularly useful for forming storage discs for recording data and also for forming panels of high optical transmittance.
REFERENCES:
patent: 3817730 (1974-06-01), Uchida
patent: 4046619 (1977-09-01), Rice et al.
patent: 4106859 (1978-08-01), DoRiguzzi et al.
patent: 4544443 (1984-05-01), Ohta et al.
patent: 4655876 (1987-04-01), Kawai et al.
patent: 4726006 (1988-02-01), Benne et al.
Hecq Andre
Ledroit Rene
Glaverbel
Powell William A.
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