Light Reflection Film And Laminate Having The Light Reflection Film

• US 20190324180A1
• Filed: 07/01/2019
• Published: 10/24/2019
• Est. Priority Date: 12/19/2014
• Status: Active Grant

• Current Assignee: Nippon Kayaku Company Limited
• Original Assignee: Nippon Kayaku Company Limited
• Inventors: Hayasaki, Tomoyuki, Asami, Hitoshi, Yahagi, Yoshiyuki, Tanaka, Kouichi
• Granted Patent: US 10,816,709 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/288 Filters employing polarising elements, e.g. Lyot or Solc filters G02B5/3016 takes precedence
• CPC Class Codes: G02B 5/0841 comprising organic materials, e.g. polymers
• CPC Class Codes: G02B 5/205 Neutral density filters
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: 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
• CPC Class Codes: G02B 5/3041 comprising multiple thin layers, e.g. multilayer stacks
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001

Abstract

A light reflection film includes at least one light reflection layer RPRL in which a cholesteric liquid crystal phase of a right-handed helical structure having right circularly polarized light reflection ability is fixed; and at least one light reflection layer LPRL in which a cholesteric liquid crystal phase of a left-handed helical structure having left circularly polarized light reflection ability is fixed. A total of three or more layers of the light reflection layer(s) RPRL and the light reflection layer(s) LPRL are laminated. The light reflection layer(s) RPRL and the light reflection layer(s) LPRL laminated each have a selective reflection center wavelength shifted by an interval of 10 nm or more and 160 nm or less between two light reflection layers adjacent to each other.

Claims

1. A method for reflecting light so that a width of a reflection band that reflects more than 50% of light with respect to incident light is 80 nm or more in a visible light region or is 150 nm or more in a near-infrared light region, with only one light reflection film,

the light reflection film comprising:

at least one light reflection layer RPRL in which a cholesteric liquid crystal phase of a right-handed helical structure having right circularly polarized light reflection ability is fixed; and

at least one light reflection layer LPRL in which a cholesteric liquid crystal phase of a left-handed helical structure having left circularly polarized light reflection ability is fixed,

wherein a total of three or more layers of the light reflection layer(s) RPRL and the light reflection layer(s) LPRL are laminated in the light reflection film, and all of the laminated light reflection layers have a selective reflection center wavelength shifted by an interval of 10 nm or more and 160 nm or less between the laminated light reflection layers.

2. The method according to claim 1, wherein the light reflection film has a region that reflects more than 50% and 95% or less of light with respect to incident light.

3. The method according to claim 1, wherein the light reflection film has a haze value (Hz) of 1.0% or less.

4. The method according to claim 1, wherein each of the laminated light reflection layers has a thickness of 0.5 μ

m or more and 5 μ

m or less.