US 12,137,190 B2
Image reading device
Kosaku Yamagata, Tokyo (JP); and Hironobu Arimoto, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/428,980
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Mar. 18, 2020, PCT No. PCT/JP2020/012020
§ 371(c)(1), (2) Date Aug. 6, 2021,
PCT Pub. No. WO2020/196168, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-055995 (JP), filed on Mar. 25, 2019.
Prior Publication US 2022/0014641 A1, Jan. 13, 2022
Int. Cl. H04N 1/03 (2006.01); G02B 3/00 (2006.01); G02B 5/00 (2006.01); G02B 7/02 (2021.01); H04N 1/031 (2006.01); H04N 1/191 (2006.01)
CPC H04N 1/0306 (2013.01) [G02B 3/005 (2013.01); G02B 5/003 (2013.01); G02B 7/021 (2013.01); H04N 1/031 (2013.01); H04N 1/1912 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An image reading device, comprising:
a lens array including lenses arrayed in a main scanning direction;
a sensor array including sensor elements arrayed in the main scanning direction, the sensor elements being configured to receive light converged by the lenses; and
an overlap preventer located between the lens array and the sensor array, the overlap preventer being configured to prevent an overlap of images formed by the lenses, the overlap preventer being a slit assembly, wherein
the slit assembly includes
two sidewall plates extending in the main scanning direction and facing each other in a sub-scanning direction intersecting with the main scanning direction,
a plurality of slit plates extending in the sub-scanning direction between the two sidewall plates to partition a space between the two sidewall plates, and
at least one specific-light blocker protruding from each of the plurality of slit plates in the main scanning direction to block specific light incident at an angle smaller than or equal to an angular aperture of the lenses from entering the sensor elements,
the at least one specific-light blocker includes a beam extending between the two sidewall plates and has a portion nearer the lenses protruding farther than a portion nearer the sensor elements, and
the at least one specific-light blocker has a right-angled triangle shape in a cross-section in which the main scanning direction and an optical axis direction of a corresponding lens in the lens array intersect with each other, wherein a hypotenuse of the right-angled triangle shape is an arc.