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US 10,048,410 B2Granted
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.
Claims9
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 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 light-shielding film has an average thickness of 2 μm or more and 30 μm or less, and
- wherein the average of extinction coefficient of the light-shielding film for light having wavelengths ranging from 400 to 700 nm is 0.03 or more and 0.15 or less.
Dependencies are inferred from the claim text.