US 12,118,819 B2
Fingerprint recognition sensor and optical element
Ryoji Himeno, Kanagawa (JP); Shinichi Morishima, Kanagawa (JP); Yuki Hirai, Kanagawa (JP); Makoto Kamo, Kanagawa (JP); and Megumi Sekiguchi, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Sep. 26, 2023, as Appl. No. 18/474,861.
Application 18/474,861 is a continuation of application No. PCT/JP2022/015870, filed on Mar. 30, 2022.
Claims priority of application No. 2021-056929 (JP), filed on Mar. 30, 2021; and application No. 2021-157932 (JP), filed on Sep. 28, 2021.
Prior Publication US 2024/0021012 A1, Jan. 18, 2024
Int. Cl. G06V 40/13 (2022.01); G02B 5/20 (2006.01)
CPC G06V 40/1318 (2022.01) [G02B 5/208 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A fingerprint recognition sensor comprising:
a light-receiving element; and
an optical element that includes a near infrared absorbing dichroic substance,
wherein a fingerprint reading surface is positioned on a side of the optical element opposite to the light-receiving element side,
the optical element has an absorption axis with respect to near infrared light in an in-plane direction, and
in a case where linearly polarized light of near infrared light orthogonal to the absorption axis is radiated from a normal direction of the optical element and from a direction inclined by 45° from the normal direction at an azimuthal angle orthogonal to the absorption axis, an absorbance during the radiation from the direction inclined by 45° from the normal direction is more than an absorbance during the radiation from the normal direction.