Optical film, optical element, manufacturing method thereof, and photographic optical system
AssigneeCanon Kabushiki Kaisha
InventorsHiroyuki Tanaka, Motokazu Kobayashi
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Abstract
An optical film includes a fluoride layer made of a fluoride containing at least Li element and at least one kind of element selected from Mg and Al. A method for manufacturing an optical film includes allowing at least Li metal, a metal acetate or a metal alkoxide of at least one kind of metal selected from Mg and Al, and trifluoroacetic acid to react in a solvent to obtain a fluorine-containing precursor containing a metal fluorocarboxylate, and, after coating the fluorine-containing precursor on a base material, heating the fluorine-containing precursor to form a fluoride layer made of a fluoride containing at least Li element and at least one kind of element selected from Mg and Al.
Claims10
An optical film comprising:
- a fluoride layer made of a fluoride containing at least Li element and at least one kind of element selected from Mg and Al.
A method for manufacturing an optical element, the method comprising:
- allowing at least Li metal, a metal acetate or a metal alkoxide of at least one kind of metal selected from Mg and Al, and trifluoroacetic acid to react in a solvent to obtain a fluorine-containing precursor containing a metal fluorocarboxylate;
- and
- after coating the fluorine-containing precursor on a base material, heating the fluorine-containing precursor to form a fluoride layer made of a fluoride containing at least Li element and at least one kind of element selected from Mg and Al.
A method for manufacturing an optical element, the method comprising:
- dissolving metal fluorocarboxylate obtained by allowing at least Li metal, at least one kind of metal selected from Mg and Al, and trifluoroacetic acid to react in a solvent to obtain a fluorine-containing precursor;
- and
- after coating the fluorine-containing precursor on a base material, heating the fluorine-containing precursor to form a fluoride layer made of a fluoride containing at least Li element and at least one kind of element selected from Mg and Al.
Dependencies are inferred from the claim text.