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US 2018/0329120 A1Published application
Light-shielding film for optical element and optical element having light-shielding film
AssigneeCanon Kabushiki Kaisha
InventorReiko Kubota
Life of this patent
Estimating the term…
Abstract
A light-shielding film for optical element includes at least a resin and a colorant. The light-shielding film for optical element has an average extinction coefficient of 0.03 or more and 0.15 or less as an average of extinction coefficients of the whole light-shielding film for light having wavelengths ranging from 400 to 700 nm.
Claims17
(canceled)
A coating material comprising:
- a resin;
- and
- (i) a colorant and non-black particles having a refractive index (nd) of 2.2 or more, or
- (ii) inorganic black particles having a refractive index (nd) of 2.2 or more and 3.5 or less,
- wherein the average of extinction coefficient of the coating material for light having wavelengths ranging from 400 to 700 nm is 0.03 or more and 0.15 or less after the coating material is hardened.
2 more elements
A coating material comprising:
- a resin;
- dye;
- titania having an average particle diameter of 100 nm or less;
- and
- silica.
2 more elements
An optical element comprising a lens or a prism having a light-shielding film on an outer portion,
- wherein the light-shielding film comprises a resin, a colorant, non-black particles having a refractive index (nd) of 2.2 or more, and silica, and
- wherein the light-shielding film has an average thickness of 2 μm or more and 30 μm or less.
Dependencies are inferred from the claim text.