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1. (WO2015119016) OPTICAL PRODUCT, GLASSES LENS AND GLASSES

Pub. No.:    WO/2015/119016    International Application No.:    PCT/JP2015/052346
Publication Date: Fri Aug 14 01:59:59 CEST 2015 International Filing Date: Thu Jan 29 00:59:59 CET 2015
IPC: G02B 1/11
G02B 5/28
G02C 7/02
G02C 7/10
Applicants: TOKAI OPTICAL CO.,LTD.
東海光学株式会社
Inventors: TAKAHASHI Hirotoshi
高橋 宏寿
Title: OPTICAL PRODUCT, GLASSES LENS AND GLASSES
Abstract:
[Problem] To provide an optical product or the like which exhibits higher reflection-prevention performance in a visible-light region, lower transmissivity of near-infrared light, lower cost, and higher durability. [Solution] An optical product having, on one or both surfaces of a substrate, an optical multilayer film having a seven-layered structure obtained by alternatingly layering a low-refractive-index layer and a high-refractive-index layer, wherein: the low-refractive-index layer is formed by using SiO2; the high-refractive-index layer is formed by using a material for which the refractive index of light having a wavelength of 500nm is 2.145 or higher; given that the layer nearest the substrate is the first layer, the physical film thickness of the fifth layer, which is one of the low-refractive-index layers, is 145-165nm, inclusive; and the sum of the optical film thicknesses (λ=500nm) of the fourth through sixth layers is 1.3-1.5λ, inclusive.