Optical film for eyewear, and optical laminate and eyewear using the optical film

Patent metadata

Field	Value
Publication number	US-2019033620-A1
Application number	US-201816151477-A
Country	US
Kind code	A1
Filing date	Oct 4, 2018
Priority date	Apr 8, 2016
Publication date	Jan 31, 2019
Grant date	—

Abstract

An optical film for eyewear includes a first light control layer, at least one light reflection layer, a second light control layer, and a linear polarization element layer in this order from an outer side with respect to a viewer. The light reflection layer includes a cholesteric liquid crystal layer that reflects left-handed circularly polarized light or right-handed circularly polarized light in a visible light range, and the first light control layer and the second light control layer are each a quarter wave plate.

First claim

What is claimed is:

1 . An optical film for eyewear comprising a first light control layer, at least one light reflection layer, a second light control layer, and a linear polarization element layer in this order from an outer side with respect to a viewer,
the light reflection layer including a cholesteric liquid crystal layer that reflects left-handed circularly polarized light or right-handed circularly polarized light in a visible light range; and the first light control layer and the second light control layer being each a quarter wave plate.

2 . The optical film for eyewear according to claim 1 , wherein two or more light reflection layers are laminated and each of the two or more laminated light reflection layers reflects circularly polarized light in an identical direction.

3 . The optical film for eyewear according to claim 1 , wherein a slow axis of the first light control layer is arranged in a direction in which s-polarized light incident on the first light control layer is converted into circularly polarized light in a direction the same as the direction of circularly polarized light reflected by the light reflection layer.

4 . The optical film for eyewear according to claim 1 , wherein the first light control layer and the second light control layer are laminated in a positional relation that slow axes of the quarter wave plates are orthogonal to each other.

5 . An optical laminate comprising a first support body, a second support body, and the optical film for eyewear according to claim 1 arranged between the first support body and the second support body.

6 . The optical laminate according to claim 5 , wherein the first support body and the second support body are each a substrate made of a plastic material.

7 . Eyewear comprising the optical film according to claim 1 .

8 . Eyewear comprising the optical laminate according to claim 5 .

Assignees

• Nippon Kayaku Kk

Inventors

• Yahagi Yoshiyuki
• Tanaka Kouichi
• Abe Saki
• Aikawa Yuki

Classifications

• G02C2202/16

  Laminated or compound lenses · CPC title

• G02C7/10

  Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses · CPC title

• G02C7/12 Primary

  Polarisers · CPC title

• B32B7/02

  Physical, chemical or physicochemical properties · CPC title

• G02B5/3025

  Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence) · CPC title