US 12,304,224 B2
Image forming apparatus
Yoshihiko Tanaka, Mishima (JP); Mitsuhiro Ohta, Yokohama (JP); Takatoshi Tanaka, Atami (JP); Fumihiko Yamaya, Mishima (JP); Naoki Matsushita, Suntou-gun (JP); and Hiroki Katayama, Suntou-gun (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Oct. 12, 2023, as Appl. No. 18/485,896.
Application 18/485,896 is a division of application No. 16/654,429, filed on Oct. 16, 2019, granted, now 11,820,158.
Claims priority of application No. 2018-197220 (JP), filed on Oct. 19, 2018; and application No. 2018-197221 (JP), filed on Oct. 19, 2018.
Prior Publication US 2024/0034073 A1, Feb. 1, 2024
Int. Cl. B41J 2/44 (2006.01); B41J 2/45 (2006.01); B41J 2/455 (2006.01); B41J 2/47 (2006.01); G02B 26/08 (2006.01); G02B 26/12 (2006.01); G03G 15/04 (2006.01)
CPC B41J 2/471 (2013.01) [B41J 2/442 (2013.01); B41J 2/45 (2013.01); B41J 2/455 (2013.01); G02B 26/0816 (2013.01); G02B 26/122 (2013.01); G02B 26/127 (2013.01); G03G 15/04 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a photosensitive member;
a scanning unit configured to scan said photosensitive member with laser light depending on image information, wherein said scanning unit includes a light source configured to emit the laser light depending on the image information, a rotatable polygonal mirror which is configured to deflect the laser light emitted from said light source and which is made of a resin material, and a sensor configured to receive the laser light reflected by said rotatable polygonal mirror;
a surface identifying portion configured to identify of a plurality of reflecting surfaces of said rotatable polygonal mirror on the basis of a signal outputted from said sensor;
a storing portion configured to store deviation correction data for correcting deviation in a main scan direction of the laser light at a predetermined temperature, and to store a temperature correction parameter used for correcting the deviation correction data depending on a temperature which is associated with the plurality of reflecting surfaces, the temperature correction parameter being stored with different values depending on the reflecting surfaces;
a circuit substrate configured to drive said rotatable polygonal mirror;
a temperature detecting portion configured to detect a temperature of an inside of said image forming apparatus, wherein said temperature detecting portion is provided on said circuit substrate; and
a correction data controller configured to correct the deviation correction data, stored in the storing portion, corresponding to each of the reflecting surfaces on the basis of the temperature correction parameter corresponding to each of the reflecting surfaces and the temperature detected by said temperature detecting portion,
wherein positional deviation in the main scan direction of the laser light is corrected on the basis of the deviation correction data corrected by said correction data controller.