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US 11,840,480 B2Granted
Optical glass, optical element, optical device, method for producing optical glass, and method for producing optical element
AssigneeCanon Kabushiki Kaisha
InventorMichio Endo
Life of this patent
Estimating the term…
Abstract
Provided is an optical glass containing glass-forming cations, the optical glass satisfying, expressed in cation percent, 10 cat %≤B3+≤50 cat %, 15 cat %≤La3+≤35 cat %, 20 cat %≤Nb5+≤50 cat %, and 15 cat %≤Ti4+≤25 cat %.
Claims16
An optical glass, comprising:
- glass-forming cations, the optical glass satisfying, expressed in cation percent:
- 10 cat %≤B3+≤50 cat %,
- 15 cat %≤La3+≤35 cat %,
- 20 cat %≤Nb5+≤50 cat %, and
- 15 cat %≤Ti4+≤25 cat %.
2 more elements
A method for producing an optical glass using a containerless solidification method, comprising the steps of levitating a glass material with a levitation gas, the glass material satisfying, expressed in cation percent:
- 10 cat %≤B3+≤50 cat %,
- 15 cat %≤La3+≤35 cat %,
- 20 cat %≤Nb5+≤50 cat %, and
- 15 cat %≤Ti4+≤25 cat %,
- heating and melting the levitated glass material to form a melt, and cooling and solidifying the melt in a levitated state.
2 more elements
A method for producing an optical element, comprising the steps of:
- providing a lens preform of an optical glass containing glass-forming cations, the optical glass satisfying, expressed in cation percent:
- 10 cat %≤B3+≤50 cat %,
- 15 cat %≤La3+≤35 cat %,
- 20 cat %≤Nb5+≤50 cat %, and
- 15 cat %≤Ti4+≤25 cat %;
- press-molding the heated lens preform with a mold member;
- and
- releasing the molded lens preform from the mold member to form an optical element.
5 more elements
Dependencies are inferred from the claim text.