OPTICAL ELEMENT AND SENSOR

WIPO Patent Application WO/2019/131950

A1

The present invention addresses the problem of providing a thin optical element capable of reflecting only light in a specific wavelength range in a given direction, and a sensor using the optical element. The optical element has a cholesteric liquid crystal layer. The cholesteric liquid crystal layer has a liquid crystal alignment pattern in which the orientation of an optical axis originating from a liquid crystal compound changes while continuously rotating along at least one direction within a plane. When defining as one period the length through which the orientation of the optical axis changing while continuously rotating in the one direction rotates through 180 degrees, the cholesteric liquid crystal layer has regions with different period lengths within the plane. With this configuration, the aforementioned problem is solved.

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YANAI YUJIRO (JP)
NAGAI MICHIO (JP)
SATO HIROSHI (JP)

PCT/JP2018/048334

July 04, 2019

December 27, 2018

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FUJIFILM CORP (JP)

G02B5/30; G01S7/481

WO2016194961A1	2016-12-08
WO2017199812A1	2017-11-23
WO2016194890A1	2016-12-08
WO2014203986A1	2014-12-24

JP2008083010A	2008-04-10
JP2004309618A	2004-11-04

ITOH Hideaki et al. (JP)

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