Patent ID: 11942489
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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.