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. 23, 2018
Filed:
Jun. 28, 2016
Tokai Optical Co., Ltd., Okazaki-Shi, JP;
Hirotoshi Takahashi, Okazaki, JP;
Tokai Optical Co., Ltd., Ozazaki-Shi, JP;
Abstract
It is an object to provide an optical product and the like which have antireflective performance, require less number of types of materials for film formation, have a simple film structure which makes film formation easy and reduces costs, and have sufficient heat resistance. In the optical product, an optical multilayer film having a five-layer structure in which SiOand ZrOare alternately layered is provided on one or both of surfaces of a base. With a layer closest to the base being a first layer, a quotient obtained by dividing a physical thickness of a fourth layer that is ZrOby a physical thickness of a second layer that is ZrOis greater than or equal to 1 and not greater than 4.