Optical product, plastic spectacle lens, and spectacles
AssigneeTokai Optical Co., Ltd.
InventorHirotoshi TAKAHASHI
Life of this patent
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Abstract
The optical product includes an optical multilayer film which is disposed on one surface or both surfaces of a base directly or via an intermediate film. The optical multilayer film is obtained by alternately disposing an SiO2 layer and a ZrO2 layer, forming nine layers in total, such that a first layer counting from the base is the SiO2 layer. The optical thickness of the SiO2 layer as the first layer is not greater than 0.120×λ/4 when a design wavelength is λ (500 nm), the optical thickness of the ZrO2 layer as a second layer is not less than 0.400×λ/4, the optical thickness of the SiO2 layer as a third layer is not less than 0.230×λ/4, and the optical thickness of the SiO2 layer as a seventh layer is not less than 0.450×λ/4.
Claims15
An optical product comprising an optical multilayer film which is disposed on one surface or both surfaces of a base directly or via an intermediate film, wherein
- the optical multilayer film is obtained by alternately disposing an SiO2 layer and a ZrO2 layer, forming nine layers in total, such that a first layer counting from the base is the SiO2 layer,
- an optical thickness of the SiO2 layer as the first layer is not greater than 0.120×λ/4 when a design wavelength is λ where is 500 nm,
- an optical thickness of the ZrO2 layer as a second layer is not less than 0.400×λ/4,
- an optical thickness of the SiO2 layer as a third layer is not less than 0.230×λ/4, and
- an optical thickness of the SiO2 layer as a seventh layer is not less than 0.450×λ/4.
Dependencies are inferred from the claim text.