Optical film for eyewear, and functional film for eyewear, optical laminate for eyewear, and eyewear which have same

Patent metadata

Field	Value
Publication number	US-11022732-B2
Application number	US-201815982018-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	Nov 19, 2015
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

The present disclosure provides an optical film for eyewear that allows, when used by a person feeling stressed, easy of production of a space having a color tone that the person psychologically feels healing, and a functional film for eyewear, an optical laminate, and eyewear that each include the optical film. The optical film for eyewear including an optical functional layer, and has that transmitted light from a light source of white light has a pale tone, is provided.

First claim

What is claimed is:

1. An optical film for eyewear comprising an optical functional layer, wherein
the optical functional layer includes a cholesteric liquid crystal layer having fixed orientation,
an L* value representing luminance is within a range between 70 and 100 inclusive by quantifying a color tone of transmitted light from a light source of white light through the optical film based on an L*a*b* color system according to JIS Z 8781-4:2013, and
the white light is standard light C standardized by CIE.

2. The optical film for eyewear according to claim 1 , wherein a C* value representing saturation and calculated by substituting an a* value and a b* value representing chromaticity for formula (1) below is within a range between 1 and 35 inclusive by quantifying the color tone of the transmitted light based on an L*a*b* color system according to JIS Z 8781-4:2013:
C *=[( a *) 2 +( b *) 2 ] 1/2   (1).

3. The optical film for eyewear according to claim 1 , wherein an a* value representing chromaticity is within a range between −15 and 5 inclusive and a b* value representing chromaticity is within a range between −20 and 0 inclusive by quantifying the color tone of the transmitted light based on an L*a*b* color system according to JIS Z 8781-4:2013.

4. A functional film for eyewear comprising the optical film according to claim 1 , and a polarizer.

5. An optical laminate for eyewear comprising:
the optical film according to claim 1 ; and
two support bodies which are arranged in a positional relationship holding the optical film front face and back face sides of the optical film.

6. The optical laminate for eyewear according to claim 5 , wherein at least one of the two support bodies is formed by one or two or more materials selected from the group consisting of triacetylcellulose, polycarbonate, nylon resin, and cycloolefin polymer.

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

8. The eyewear according to claim 7 , further comprising a lens, wherein the optical laminate is arranged on one surface side or both surface sides of the lens.

Assignees

• Nippon Kayaku Kk

Inventors

• Abe Saki
• Yahagi Yoshiyuki
• Tanaka Kouichi

Classifications

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G02B5/28 Primary

  Interference filters · CPC title

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title