Crystallized glass for optical filter substrate, and optical...

Details Crystallized glass for optical filter substrate, and optical... Crystallized glass for optical filter substrate, and optical...

2006-03-07

2006-03-07

Wood, Elizabeth D. (Department: 1755)

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

C501S068000, C501S069000, C501S070000, C501S073000, C428S426000

Reexamination Certificate

active

07008891

ABSTRACT:
A crystallized glass for an optical filter substrate, which has an average linear expansion coefficient αLof from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C. and which has a crystal or the like of Na4-xKxAl4Si4O16(1<x≦4) precipitated therein. Further, a crystallized glass for an optical filter substrate, which comprises from 35 to 60% of SiO2, from 10 to 30% of Al2O3, from 1 to 15% of TiO2+ZrO2, from 4 to 20% of Na2O, from 4 to 20% of K2O, from 0.1 to 10% of CaO+SrO+Bao, from 0 to 10% of MgO, etc., and which has αLof from 95×10−7/° C. to 130×10−7/° C. and which has a crystal or solid solution precipitated therein.

REFERENCES:
patent: 4310595 (1982-01-01), Beall et al.
patent: 6383645 (2002-05-01), Goto et al.
patent: 1 078 896 (2001-02-01), None
patent: 56-149344 (1981-11-01), None
patent: 59-223249 (1984-12-01), None
patent: 7-234315 (1995-09-01), None

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