US 11,743,406 B2
Illumination device for image sensor
Takaaki Morimoto, Himeji (JP); Akira Bogaki, Himeji (JP); Naoki Tomigaki, Himeji (JP); and Yuki Kiyose, Himeji (JP)
Assigned to GLORY LTD., Himeji (JP)
Filed by Glory Ltd., Himeji (JP)
Filed on Aug. 30, 2022, as Appl. No. 17/898,524.
Application 17/898,524 is a continuation of application No. PCT/JP2021/007025, filed on Feb. 25, 2021.
Claims priority of application No. 2020-035229 (JP), filed on Mar. 2, 2020.
Prior Publication US 2022/0417381 A1, Dec. 29, 2022
Int. Cl. H04N 1/028 (2006.01); F21V 8/00 (2006.01)
CPC H04N 1/02835 (2013.01) [G02B 6/0068 (2013.01); G02B 6/0076 (2013.01); H04N 1/02805 (2013.01); H04N 1/02885 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An image sensor lighting unit comprising:
at least one light guide extending in a main scanning direction and configured to emit light in a predetermined direction;
a first light source group facing a first end surface of at least two end surfaces of the at least one light guide in the main scanning direction; and
a second light source group facing a second end surface of the at least two end surfaces,
the first light source group including a first light source configured to emit light having a predetermined wavelength band,
the second light source group including a second light source configured to emit light having a same wavelength band as the light emitted from the first light source,
with an XY-coordinate system consisting of a Y-axis and an X-axis set with the at least one light guide viewed from the first end surface side in the main scanning direction, an X-coordinate of the first light source in a corresponding XY-coordinate system being equal in absolute value to an X-coordinate of the second light source in a corresponding XY-coordinate system,
the Y-axis set on an optical axis of emitted light and being positive in a traveling direction of the emitted light, and
the X-axis formed by rotating the Y-axis clockwise by 90° with a center of an end surface of the corresponding light guide in the main scanning direction taken as an axis of rotation.