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US 11,254,602 B2Granted
Optical glass, optical element, optical instrument, and method for manufacturing optical glass
AssigneeCanon Kabushiki Kaisha
InventorMichio Endo
Life of this patent
Estimating the term…
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+, and Nb5+, and optionally Ti4+, Gd3+, Y3+, Yb3+, and/or Lu3+, wherein expressed as cation %, La3+, Zn2+, Nb5+, and Ti4+ satisfy:
- 10 cat %≤La3+≤20 cat %;
- 20 cat %<Zn2+≤60 cat %;
- 20 cat %≤Nb5+≤60 cat %;
- and
- 0 cat %≤Ti4+≤40 cat %,
- wherein B2O3 is not contained in the optical glass.
4 more elements
An optical element comprising:
- an optical glass comprising:
- La3+, Zn2+, and Nb5+, and optionally Ti4+, Gd3+, Y3+, Yb3+, and/or Lu3+, wherein expressed as cation %, La3+, Zn2+, Nb5+, and Ti4+ satisfy:
- 10 cat %≤La3+≤20 cat %;
- 20 cat %<Zn2+≤60 cat %;
- 20 cat %≤Nb5+≤60 cat %;
- and
- 0 cat %≤Ti4+≤40 cat %,
- wherein B2O3 is not contained in the optical glass.
5 more elements
A method for manufacturing an optical glass using a containerless solidification method, the method comprising:
- levitating a glass material with a levitation gas, wherein the glass material comprises:
- La3+, Zn2+, and Nb5+, and optionally Ti4+, Gd3+, Y3+, Yb3+, and/or Lu3+, wherein expressed as cation %, La3+, Zn2+, Nb5+, and Ti4+ satisfy:
- 10 cat %≤La3+≤20 cat %;
- 20 cat %<Zn2+≤60 cat %;
- 20 cat %≤Nb5+≤60 cat %;
- and
- 0 cat %≤Ti4+≤40 cat %,
- wherein B2O3 is not contained in the glass;
- 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.
8 more elements
Dependencies are inferred from the claim text.