US 12,346,038 B2
Reading apparatus, image forming apparatus, and reading method
Masaki Hachisuga, Kanagawa (JP)
Assigned to FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed by FUJIFILM Business Innovation Corp., Tokyo (JP)
Filed on May 5, 2022, as Appl. No. 17/737,950.
Claims priority of application No. 2021-178140 (JP), filed on Oct. 29, 2021.
Prior Publication US 2023/0133357 A1, May 4, 2023
Int. Cl. G03G 15/04 (2006.01); F21V 8/00 (2006.01)
CPC G03G 15/04036 (2013.01) [G02B 6/001 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A reading apparatus comprising:
a light source;
a film-shaped optical filter that blocks light having a predetermined wavelength among light from the light source; and
a cylindrical light guide body that guides light passing through the optical filter and incident on one end surface to the other end surface, and irradiates an irradiation target body with light emitted from a side surface,
wherein a diffusion pattern that diffuses the light is disposed on an opposite side not facing the irradiation target body, on the side surface of the light guide body, and
the optical filter is disposed at a position facing the end surface of the light guide body to be tilted with respect to the end surface of the light guide body, wherein the optical filter is disposed such that an angle formed by the light from the light source and a normal line with respect to a plane of the optical filter is smaller on a side facing a diffusion pattern side than on a side facing an irradiation target body side of the end surface of the light guide body.