Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1992-11-12
1994-06-21
Jones, W. Gary
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 33, 65111, 501 7, 430323, 430330, C03B 3200, C03C 1000
Patent
active
053225384
ABSTRACT:
A photosensitive glass processing method, and article made thereby, which makes it possible to facilitate the etch depth control, minimize the surface roughness of the etched surface, improve the operating efficiency in single-side etching process, and increase the yield includes a first exposure step, in which laser light is applied to the obverse side of photosensitive glass from above it through an exposure mask by using a pulsed laser that covers the sensitivity wavelength range of the photosensitive glass, thereby forming a first exposed portion, the energy intensity per pulse of laser light being set at 10 mJ/cm.sup.2, and the total exposure energy being set at 500 mJ/cm.sup.2 ; a second exposure step, in which laser light is applied to an end surface of the photosensitive glass through another exposure mask, thereby forming a second exposed portion, the energy intensity per pulse of laser light being set at 10 mJ/cm.sup.2, and the total exposure energy being set at 15,000 mJ/cm.sup.2, wherein the first exposed portion, which is crystallized by heat treatment, is easy to etch, while the second exposed portion, which is crystallized by the same heat treatment, is difficult to etch, and a groove is formed at the position of the first exposed portion.
REFERENCES:
patent: 3473927 (1969-10-01), Loose
patent: 4057408 (1977-11-01), Pierson
patent: 4092166 (1978-05-01), Olsen
"Practical Surface Technologies", No. 11, 1988, Takashi Matsurra, Photo Chemically Machinable Glass Ceramics (Japanese language copy plus English translation thereof attached hereto).
Schott Product Information No. 4844/2e, Forturan Intricate-shaped glass and glass-ceramic components.
Kondo Nobuhiro
Ono Hirokazu
Hoffmann John
Jones W. Gary
Seikosha Co. Ltd.
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