Glass and optical element
AssigneeHoya Corporation
InventorsKoichi SATO, Yoshitake TANNO, Naomi MATSUMOTO
Life of this patent
Estimating the term…
Abstract
Provided is oxide glass in which a content of P5+ is 7 to 43 cation %, a content of Nb ions is 10 to 21 cation %, a content of Li+ is 20 cation % or more, a total content of Nb ions and Li+ is 48 to 70 cation %, a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %, a content of Ba2+ is 5 cation % or less, a content of Zr4+ is 2 cation % or less, a total content of Ti ions and W ions is 5 cation % or less, and a cation ratio of the content of Li+ to a total content of Li+, Na+, and K+[Li+/(Li++Na++K+)] is 0.5 or more.
Claims16
Oxide glass,
- wherein a content of P5+ is 7 to 43 cation %,
- a content of Nb ions is 10 to 21 cation %,
- a content of Li+ is 20 cation % or more,
- a total content of Nb ions and Li+ is 48 to 70 cation %,
- a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %,
- a content of Ba2+ is 5 cation % or less,
- a content of Zr4+ is 2 cation % or less,
- a total content of Ti ions and W ions is 5 cation % or less, and
- a cation ratio of the content of Li+ to a total content of Li+, Na+, and K+ [Li+/(Li++Na++K+)] is 0.5 or more.
An optical element integrally comprising:
- a light-transmitting portion;
- and
- a light-shielding portion in which a transmittance of visible light is smaller in comparison to the light-transmitting portion,
- wherein the optical element comprises oxide glass containing P5+, Nb ions, Bi ions, and Li+ as a glass component, and
- the oxide glass satisfies at least one of the following conditions (i) and (ii),
- (i) a total content of Nb ions and Li+ is 50 cation % or more, and
- (ii) a cation ratio of the content of Li+ to a total content of Li+, Na+, and K+ [Li+/(Li++Na++K+)] is 0.5 or more.
An optical element,
- wherein the optical element comprises glass having specific gravity of 3.5 or less,
- the optical element integrally includes a light-transmitting portion in which an internal transmittance at a wavelength of 380 nm in terms of a thickness of 1.0 mm is 96% or more, and a light-shielding portion in which an optical density OD at a wavelength of 1100 nm is 0.5 or more, and
- the light-transmitting portion and the light-shielding portion have the same glass composition.
Dependencies are inferred from the claim text.