US 11,942,489 B2
Image reading device
Hiroyuki Kawano, Tokyo (JP); Naoki Nakagawa, Tokyo (JP); Takeshi Ono, Tokyo (JP); Shigeru Takushima, Tokyo (JP); Taisuke Makita, Tokyo (JP); and Naoyuki Tokida, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/634,244
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Sep. 5, 2019, PCT No. PCT/JP2019/034944
§ 371(c)(1), (2) Date Feb. 10, 2022,
PCT Pub. No. WO2021/044573, PCT Pub. Date Mar. 11, 2021.
Prior Publication US 2022/0328540 A1, Oct. 13, 2022
Int. Cl. H04N 1/03 (2006.01); H01L 27/146 (2006.01); H04N 1/031 (2006.01); H04N 1/191 (2006.01); H04N 1/192 (2006.01); H04N 1/195 (2006.01)
CPC H01L 27/14605 (2013.01) [H01L 27/14627 (2013.01); H04N 1/0306 (2013.01); H04N 1/1917 (2013.01); H04N 1/192 (2013.01); H04N 1/19589 (2013.01); H04N 1/0318 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An image reading device comprising:
a plurality of light-receiving pixels arranged in a predetermined arrangement direction and configured to receive light reflected on an imaging object, the imaging object being placed on a predetermined reference surface;
a first light-shielding member including a plurality of first openings and disposed between the plurality of light-receiving pixels and the reference surface;
a second light-shielding member including a plurality of second openings and disposed between the plurality of first openings and the reference surface;
a plurality of condenser lenses disposed between the plurality of second openings and the reference surface and disposed at a distance from the plurality of second openings;
a first light-transmissive member disposed between the first light-shielding member and the second light-shielding member; and
a second light-transmissive member disposed between the second light-shielding member and the plurality of condenser lenses, wherein
the plurality of first openings are arranged to correspond to the plurality of light-receiving pixels respectively,
the plurality of second openings are arranged to correspond to the plurality of light-receiving pixels respectively,
the plurality of condenser lenses are arranged to correspond to the plurality of light-receiving pixels respectively,
the plurality of condenser lenses, the second light-shielding member, the first light-shielding member, and the plurality of light-receiving pixels are arranged at positions at which the reflected light entering each light-receiving pixel of the plurality of light-receiving pixels sequentially passes through one of the plurality of condenser lenses corresponding to the each light-receiving pixel, one of the plurality of second openings corresponding to the each light-receiving pixel, and one of the plurality of first openings corresponding to the each light-receiving pixel and enters the each light-receiving pixel, and
t2>n·t0−t1
where t0 denotes a distance between the plurality of light-receiving pixels and the first light-shielding member, t1 denotes a thickness of the first light-transmissive member, t2 denotes a thickness of the second light-transmissive member, and n denotes a refractive index of each of the first light-transmissive member and the second light-transmissive member.