Optical member and method for manufacturing optical member
AssigneeCanon Kabushiki Kaisha
InventorsKenji Makino, Toshinao Tatsuno
Life of this patent
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Abstract
An optical member that has excellent antireflection properties and that can maintain antifogging properties over a long term, and a method for manufacturing an optical member are provided. The optical member includes, in sequence, a substrate, a porous layer, and a multilayered antireflection layer. The ratio n/n0 is 0.85 or more and 0.95 or less, where n represents a refractive index of a layer having the highest refractive index among layers included in the antireflection layer and n0 represents a refractive index of a compound constituting the layer having the highest refractive index at a theoretical density.
Claims24
An optical member comprising, in sequence:
- a substrate;
- a porous layer;
- and
- a multilayered antireflection layer,
- wherein a ratio n/n0 is 0.85 or more and 0.95 or less, where n represents a refractive index of a layer having the highest refractive index among layers included in the antireflection layer and n0 represents a refractive index of a compound constituting the layer having the highest refractive index at a theoretical density.
An optical apparatus comprising:
- a casing;
- and
- an optical system disposed in the casing, the optical system including a plurality of lenses,
- wherein at least one of the lenses includes, in sequence, a substrate, a porous layer, and a multilayered antireflection layer, and
- a ratio n/n0 is 0.85 or more and 0.95 or less, where n represents a refractive index of a layer having the highest refractive index among layers included in the antireflection layer and n0 represents a refractive index of a compound constituting the layer having the highest refractive index at a theoretical density.
An imaging apparatus comprising:
- a casing;
- an optical system disposed in the casing, the optical system including a plurality of lenses;
- and
- an imaging device that receives light that has passed through the optical system,
- wherein at least one of the lenses includes, in sequence, a substrate, a porous layer, and a multilayered antireflection layer, and
- a ratio n/n0 is 0.85 or more and 0.95 or less, where n represents a refractive index of a layer having the highest refractive index among layers included in the antireflection layer and n0 represents a refractive index of a compound constituting the layer having the highest refractive index at a theoretical density.
A method for manufacturing an optical member, the method comprising:
- a step of forming a porous layer by supplying, onto a substrate, a liquid containing particles, a component that forms a binder, and a solvent;
- and
- a step of forming a multilayered antireflection layer on the porous layer,
- wherein, in the step of forming an antireflection layer, a layer having the highest refractive index among layers included in the antireflection layer is formed by a vapor deposition process so that a ratio n/n0 is 0.85 or more and 0.95 or less, where n represents the refractive index of the layer having the highest refractive index among layers included in the antireflection layer and n0 represents a refractive index of a compound constituting the layer having the highest refractive index at a theoretical density.
Dependencies are inferred from the claim text.