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US 2019/0119147 A1Published application
Optical glass, optical element, optical instrument, and method for manufacturing optical glass
AssigneeCanon Kabushiki Kaisha
InventorMichio Endo
Life of this patent
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Abstract
An optical glass includes La3+, Zn2+, Nb5+, and Ti4+ as a cation configuring glass. La3+, Zn2+, Nb5+, and Ti4+ which satisfy 10 cat %≤La3+≤20 cat %, 10 cat %≤Zn2+≤60 cat %, 20 cat %≤Nb5+≤60 cat %, and 0 cat %≤Ti4+≤40 cat % expressed by cation %.
Claims12
An optical glass comprising:
- La3+, Zn2+, Nb5+, and Ti4+ as a cation configuring glass, wherein
- La3+, Zn2+, Nb5+, and Ti4+ satisfy:
- 10 cat %≤La3+≤20 cat %;
- 10 cat %≤Zn2+≤60 cat %;
- 20 cat %≤Nb5+≤60 cat %, and
- 0 cat %≤Ti4+≤40 cat % expressed by cation %.
3 more elements
An optical element comprising:
- an optical glass comprising:
- La3+, Zn2+, Nb5+, and Ti4+ as a cation configuring glass, wherein
- La3+, Zn2+, Nb5+, and Ti4+ satisfy:
- 10 cat %≤La3+≤20 cat %;
- 10 cat %≤Zn2+≤60 cat %;
- 20 cat %≤Nb5+≤60 cat %, and
- 0 cat %≤Ti4+≤40 cat % expressed by cation %.
4 more elements
A method for manufacturing an optical glass using a containerless solidification method, the method comprising:
- levitating a glass material satisfying
- 10 cat %≤La3+≤20 cat %,
- 10 cat % Zn2+≤60 cat %,
- 20 cat % Nb5+≤60 cat %, and
- 0 cat %≤Ti4+≤40 cat % expressed by cation % by levitation gas;
- heating and melting the levitated glass material to obtain a melt;
- and
- cooling and solidifying the melt in a state where the melt is levitated.
5 more elements
Dependencies are inferred from the claim text.