US 12,333,851 B2
Optical sensor
Takao Someya, Tokyo (JP); and Ikue Kawashima, Tokyo (JP)
Assigned to The University of Tokyo, Tokyo (JP)
Appl. No. 17/788,873
Filed by The University of Tokyo, Tokyo (JP)
PCT Filed Dec. 25, 2020, PCT No. PCT/JP2020/048849
§ 371(c)(1), (2) Date Jun. 24, 2022,
PCT Pub. No. WO2021/132605, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-238112 (JP), filed on Dec. 27, 2019.
Prior Publication US 2023/0051655 A1, Feb. 16, 2023
Int. Cl. G06V 40/145 (2022.01); A61B 5/1171 (2016.01)
CPC G06V 40/145 (2022.01) [A61B 5/1171 (2016.02)] 19 Claims
OG exemplary drawing
 
1. An optical sensor comprising:
a light irradiation unit for performing uniform light irradiation with respect to a measurement object;
a viewing angle control plate for limiting a direction of reflected light from the measurement object to a predetermined direction; and
a light detecting unit for acquiring image information showing a distribution of the reflected light obtained through the viewing angle control plate;
wherein the viewing angle control plate is provided between the light irradiation unit and the light detecting unit;
wherein the viewing angle control plate is provided directly on an input side of the light detecting unit; and
wherein the viewing angle control plate has a structure in which at least two louver array films are orthogonal to each other.