US 12,222,532 B2
Optical element and method for manufacturing the same
Kenta Sekikawa, Fukushima (JP); Hiromichi Nagayama, Fukushima (JP); and So Ishido, Fukushima (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on May 24, 2024, as Appl. No. 18/674,386.
Application 18/674,386 is a continuation of application No. 18/162,909, filed on Feb. 1, 2023, granted, now 12,032,193.
Application 18/162,909 is a continuation of application No. PCT/JP2021/028752, filed on Aug. 3, 2021.
Claims priority of application No. 2020-135092 (JP), filed on Aug. 7, 2020.
Prior Publication US 2024/0310564 A1, Sep. 19, 2024
Int. Cl. G02B 5/30 (2006.01); G02B 3/00 (2006.01)
CPC G02B 5/3091 (2013.01) [G02B 3/0018 (2013.01); G02B 5/3016 (2013.01); G02B 5/3041 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An optical element comprising:
a three-dimensional structure having a curved surface; and
a retardation plate bent along the curved surface, wherein
the retardation plate includes a transparent substrate and a liquid crystal layer formed over the transparent substrate,
the retardation plate has a slow axis and a fast axis, and
a glass-transition temperature, Tgne, in the slow axis direction of the retardation plate is higher than a glass-transition temperature, Tgno, in the fast axis direction of the retardation plate.