US 12,228,764 B2
Optical element and light guide element
Hiroshi Sato, Minami-ashigara (JP); Yukito Saitoh, Minami-ashigara (JP); Ayako Muramatsu, Minami-ashigara (JP); Mayumi Nojiri, Minami-ashigara (JP); and Hideyuki Nishikawa, Minami-ashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jan. 29, 2024, as Appl. No. 18/425,887.
Application 18/425,887 is a continuation of application No. 17/036,612, filed on Sep. 29, 2020, granted, now 11,927,792.
Application 17/036,612 is a continuation of application No. PCT/JP2019/014134, filed on Mar. 29, 2019.
Claims priority of application No. 2018-067198 (JP), filed on Mar. 30, 2018.
Prior Publication US 2024/0168218 A1, May 23, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F21V 8/00 (2006.01); C09K 19/60 (2006.01); G02B 5/20 (2006.01); G02B 5/30 (2006.01)
CPC G02B 6/0056 (2013.01) [C09K 19/605 (2013.01); G02B 5/208 (2013.01); G02B 5/3016 (2013.01); G02B 6/0026 (2013.01); G02B 6/005 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical element comprising:
an optically-anisotropic layer that is formed using a composition including a liquid crystal compound and an infrared absorbing colorant,
wherein the optically-anisotropic layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction,
an absorption of the infrared absorbing colorant in a wavelength range of 700 to 2000 nm in a minor axis direction is higher than an absorption of the infrared absorbing colorant in a wavelength range of 700 to 2000 nm in a major axis direction, and
the liquid crystal compound is cholesterically aligned in a thickness direction.