Title:
OPTICAL PRODUCT, PLASTIC EYEGLASS LENS, AND EYEGLASSES
Document Type and Number:
WIPO Patent Application WO/2018/037850
Kind Code:
A1
Abstract:
[Problem] To provide, inter alia, an optical product in which reflectance is relatively increased with respect to both near-infrared rays and light of a prescribed wavelength region within the visible light region starting from blue light, and in which reflectance is reduced with respect to light in other visible light regions. [Solution] This optical product is provided with an optical multilayer film formed on one or both surfaces of a substrate either directly or with an intermediate film interposed therebetween. In the optical multilayer film, a total of nine layers are laminated such that SiO2 layers and ZrO2 layers are alternatingly disposed, a SiO2 layer being the first layer away from the substrate. Taking λ (500 nm) to be the design wavelength, the optical film thickness of the first, SiO2 layer is 0.120 × λ/4 or lower, the optical film thickness of the second, ZrO2 layer is 0.400 × λ/4 or higher, the optical film thickness of the third, SiO2 layer is 0.230 × λ/4 or higher, and the optical film thickness of the seventh, SiO2 layer is 0.450 × λ/4 or higher.
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Inventors:
TAKAHASHI HIROTOSHI (JP)
Application Number:
PCT/JP2017/027848
Publication Date:
March 01, 2018
Filing Date:
August 01, 2017
Export Citation:
Assignee:
TOKAI OPTICAL CO LTD (JP)
International Classes:
G02B5/08; G02B1/115; G02B5/26; G02B5/28; G02C7/10
Domestic Patent References:
| WO2015137282A1 | 2015-09-17 | |||
| WO2015080160A1 | 2015-06-04 |
Foreign References:
| JP2014056215A | 2014-03-27 |
Other References:
See also references of EP 3489727A4
Attorney, Agent or Firm:
ISHIDA Yoshiki (JP)
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