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:
Jul. 24, 2018
Filed:
Jun. 28, 2016
Tokai Optical Co., Ltd., Okazaki-Shi, JP;
Hirotoshi Takahashi, Okazaki, JP;
Tokai Optical Co., Ltd., Okazaki-Shi, JP;
Abstract
An optical product has, on one or both of surfaces of a base, an optical multilayer film that has a seven-layer structure where low refractive index layers and high refractive index layers are alternately layered. The low refractive index layers are formed by using SiO. The high refractive index layers are formed by using a material where a refractive index for light having a wavelength of 500 nm is greater than or equal to 2.145. When a layer closest to the base is a first layer, a fifth layer is one of the low refractive index layers, and a physical film thickness of the fifth layer is greater than or equal to 145 nm and not greater than 165 nm. A total of optical film thicknesses of a fourth layer, the fifth layer, and a sixth layer is greater than or equal to 1.3 λ and not greater than 1.5 λ.