The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 2024
Filed:
Jan. 29, 2021
Tokai Optical Co., Ltd., Okazaki, JP;
Hirotoshi Takahashi, Okazaki, JP;
Tokai Optical Co., Ltd., Okazaki, JP;
Abstract
A spectacle lens includes an optical multilayer film formed on at least one surface of a base. The spectacle lens is formed such that, in a reflectance distribution in a visible region, maximal values appear in a range of wavelengths that are not less than 440 nm and not greater than 460 nm and in a range of wavelengths that are not less than 620 nm and not greater than 640 nm. A blue light ray cutting rate calculated by using a calculation formula described in Japanese Industrial Standards 'JIS T7333 Appendix C' is not less than 7% (preferably not less than 8%) in the spectacle lens. A YI value is not greater than 6 in the spectacle lens.