# US 10,120,206 B2 · Optical film and optical laminate using same

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- Number: US 10,120,206 B2
- Document ID: US10120206B2
- Status: Granted
- Kind: B2
- Application number: 15/321,473
- Filed: 2015-06-23
- Published: 2017-06-08
- Granted: 2018-11-06
- Earliest claimed: 2014-07-01
- Assignees: Nippon Kayaku Kabushiki Kaisha; Mitsubishi Gas Chemical Company, Inc.; Mgc Filsheet Co., Ltd.
- Applicants: Nippon Kayaku Kabushiki Kaisha; Mitsubishi Gas Chemical Company, Inc.; Mgc Filsheet Co., Ltd.
- Inventors: Kouichi Tanaka; Yoshiyuki Yahagi; Hideyoshi Fujisawa; Takuya Gotou; Katsuyuki Murai; Kazuhisa Mitsuhata; Kyousuke Nakamura
- Web page: https://patentgrep.com/patent/US10120206B2

## CPC

- G02C 7/12: Polarisers
- G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00)
- G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)}
- G02B 5/3041: {comprising multiple thin layers, e.g. multilayer stacks}
- G02B 27/288: {Filters employing polarising elements, e.g. Lyot or Solc filters (G02B5/3016 takes precedence)}
- G02C 7/10: Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
- G02C 7/108: {Colouring materials}
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

[Problem] The present invention provides eyewear, such as polarized sunglasses, having cholesteric liquid crystal layers, wherein the eyewear has a metallic tone and antiglare properties, minimizes the reduction in light-polarizing element absorptive capability that is associated with circular polarization, and is moreover unaffected by external degrading factors such as sebum, moisture, and salt air. [Solution] This optical film is characterized by being provided with a light-reflecting layer R comprising a cholesteric liquid crystal layer that has right-handed helical orientation, a light-reflecting layer L comprising a cholesteric liquid crystal layer that has left-handed helical orientation, and a polarizing element layer.

## Claims

### Claim 1

An optical film, comprising:
a light-reflecting layer R comprising a cholesteric liquid crystal layer having a right-handed helical orientation,
a light-reflecting layer L comprising a cholesteric liquid crystal layer having a left-handed helical orientation, and
a polarizing element layer, wherein the polarizing element layer is adhered or bonded to a film comprising the light-reflecting layer R and the light-reflecting layer L,
wherein the difference of the center reflection wavelength between the light-reflecting layer R and the light-reflecting layer L is within 20 nm.

### Claim 2 (depends on 1)

The optical film according to claim 1, wherein the light-reflecting layer R is obtained by fixing the cholesteric crystal layer having a right-handed helical orientation and that the light-reflecting layer L is obtained by fixing the cholesteric crystal layer having a left-handed helical orientation.

### Claim 3 (depends on 1)

The optical film according to claim 1, wherein the center reflection wavelengths of the light-reflecting layer R and the light-reflecting layer L are 400 nm-800 nm.

### Claim 4 (depends on 1)

The optical film according to claim 1, wherein the polarizing element comprises a stretched polymer film containing a dichroic pigment.

### Claim 5 (depends on 1)

Eyewear comprising the optical film according to claim 1.

### Claim 6 (depends on 5)

Eyewear according to claim 5, wherein the eyewear is sunglasses, goggles, or a helmet visor.

### Claim 7

An optical laminate, comprising a light-reflecting layer R comprising a cholesteric liquid crystal layer having a right-handed helical orientation, a light-reflecting layer L comprising a cholesteric liquid crystal layer having a left-handed helical orientation, and a polarizing element layer provided between a first support and a second support,
wherein the polarizing element layer is adhered or bonded to a film comprising the light-reflecting layer R and the light-reflecting layer L,
wherein the difference of the center reflection wavelength between the light-reflecting layer R and the light-reflecting layer L is within 20 nm.

### Claim 8 (depends on 7)

The optical laminate according to claim 7, wherein the light-reflecting layer R is obtained by fixing the cholesteric liquid crystal layer having a right-handed helical orientation and that the light-reflecting layer L is obtained by fixing the cholesteric crystal layer having a left-handed helical orientation.

### Claim 9 (depends on 7)

The optical laminate according to claim 7, wherein the center reflection wavelengths of the light-reflecting layer R and the light-reflecting layer L are 400 nm-800 nm.

### Claim 10 (depends on 7)

The optical laminate according to claim 7, wherein the polarizing element comprises a stretched polymer film containing a dichroic pigment.

### Claim 11 (depends on 7)

The optical laminate according to claim 7, wherein the supports are polycarbonate.

### Claim 12 (depends on 7)

Eyewear comprising the optical laminate according to claim 7.

### Claim 13 (depends on 12)

Eyewear according to claim 12, wherein the eyewear is sunglasses, goggles, or a helmet visor.