Crystallized glass for optical filter substrate, and optical filter
AssigneeAsahi Glass Company, Limited
InventorsTomoyuki Kobayashi, Kei Maeda, Motoyuki Hirose
Life of this patent
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Abstract
A crystallized glass for an optical filter substrate, which has an average linear expansion coefficient αL of 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 αL of from 95×10−7/° C. to 130×10−7/° C. and which has a crystal or solid solution precipitated therein.
Claims26
A crystallized glass for an optical filter substrate, which consists, as represented by mol % based on the following oxides, essentially of:
- SiO2:
- 30 to 65%,
- Al2O3:
- 5 to 35%,
- TiO2+ZrO2:
- 1 to 15%,
- Na2O:
- 0 to 30%,
- K2O:
- 5 to 30%, provided K2O (%)≧Na2O (%),
- Li2O:
- 0 to 15%,
- MgO:
- 0 to 15%,
- CaO:
- 0 to 15%,
- SrO:
- 0 to 15%,
- BaO:
- 0 to 15%,
- ZnO:
- 0 to 15%,
- B2O3:
- 0 to 15%,
- P2O5:
- 0 to 15%,
- Y2O3:
- 0 to 15%,
- and which has an average linear expansion coefficient αL of from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C., and which has a crystal or solid solution of Na4-xKxAl4Si4O16 (1<x≦4) precipitated therein.
An optical filter comprising
- an optical filter substrate made of a crystallized glass for an optical filter substrate, which has an average linear expansion coefficient αL of from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C. and which has a crystal or solid solution of Na4-xKxAl4Si4O16 (1<x≦4) precipitated therein;
- and
- a dielectric multilayer film formed on the substrate, wherein
- the crystallized glass consists, as represented by mol % based on the following oxides, essentially of:
- SiO2:
- 30 to 65%,
- Al2O3:
- 5 to 35%,
- TiO2+ZrO2:
- 1 to 15%,
- Na2O:
- 0 to 30%,
- K2O:
- 5 to 30%, provided K2O (%)≧Na2O (%),
- Li2O:
- 0 to 15%,
- MgO:
- 0 to 15%,
- CaO:
- 0 to 15%,
- SrO:
- 0 to 15%,
- BaO:
- 0 to 15%,
- ZnO:
- 0 to 15%,
- B2O3:
- 0 to 15%,
- P2O5:
- 0 to 15%,
- Y2O3:
- 0 to 15%,
- and which has an average linear expansion coefficient αL of from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C., and which has a crystal or solid solution of Na4-xKxAl4Si4O16 (1<x≦4) precipitated therein.
A crystallized glass for an optical filter substrate, which consists, as represented by mol % based on the following oxides, essentially of:
- SiO2:
- 35 to 60%,
- Al2O3:
- 10 to 30%,
- TiO2+ZrO2:
- 1 to 15%,
- Na2O:
- 4 to 20%,
- K2O:
- 4 to 20%,
- CaO+SrO+BaO:
- 0.1 to 10%,
- MgO:
- 0 to 10%,
- B2O3:
- 0 to 10%,
- P2O5:
- 0 to 10%,
- and which has an average linear expansion coefficient αL of from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C., and which has a crystal or solid solution of precipitated therein.
An optical filter comprising
- an optical filter substrate made of a crystallized glass for an optical filter substrate, which consists, as represented by mol % based on the following oxides, essentially of:
- SiO2:
- 35 to 60%,
- Al2O3:
- 10 to 30%,
- TiO2+ZrO2:
- 1 to 15%,
- Na2O:
- 4 to 20%,
- K2O:
- 4 to 20%,
- CaO+SrO+BaO:
- 0.1 to 10%,
- MgO:
- 0 to 10%,
- B2O3:
- 0 to 10%,
- P2O5:
- 0 to 10%,
- and which has an average linear expansion coefficient αL of from 95×10−7/° C. to 130×10−7/° C. at from −30° C. to 70° C., and which has a crystal or solid solution of precipitated therein;
- and
- a dielectric multilayer film formed on the substrate.
Dependencies are inferred from the claim text.