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:
Oct. 16, 2018
Filed:
Jan. 13, 2016
Tokai Optical Co., Ltd., Okazaki-Shi, JP;
Hirotoshi Takahashi, Okazaki, JP;
Tokai Optical Co., Ltd., Okazaki-Shi, JP;
Abstract
An optical product (spectacle lens) according to the present invention includes a base having a convex surface and a concave surface, and an optical multilayer film formed on at least the concave surface of the base. The optical multilayer film has, in total, six layers in which a first layer is closest to the base, and a layer formed of zirconium dioxide and a layer formed of silicon dioxide are alternately layered such that the first layer is the layer formed of zirconium dioxide. A physical film thickness of a fourth layer formed of silicon dioxide is greater than or equal to 10 nm and not greater than 22 nm. A sum of physical film thicknesses of the first layer formed of zirconium dioxide and a second layer formed of silicon dioxide is greater than or equal to 35 nm and not greater than 45 nm.