US 12,306,552 B2
Image forming apparatus for forming image using plurality of exposure heads
Junichi Goda, Chiba (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 8, 2024, as Appl. No. 18/599,286.
Application 18/599,286 is a continuation of application No. 18/183,242, filed on Mar. 14, 2023, granted, now 11,953,840.
Claims priority of application No. 2022-048420 (JP), filed on Mar. 24, 2022.
Prior Publication US 2024/0210849 A1, Jun. 27, 2024
Int. Cl. G03G 15/01 (2006.01); G03G 15/043 (2006.01); G03G 15/23 (2006.01); H04N 1/393 (2006.01); H04N 1/60 (2006.01)
CPC G03G 15/011 (2013.01) [G03G 15/043 (2013.01); G03G 15/23 (2013.01); G03G 15/231 (2013.01); H04N 1/393 (2013.01); H04N 1/6008 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a first photosensitive drum configured to be rotationally driven;
a first exposure head including a first plurality of light-emitting portions arranged in a direction along an axis of rotation of the first photosensitive drum, and configured to form an image corresponding to a first color on a surface of the first photosensitive drum by light emitted from the first plurality of light-emitting portions;
a second photosensitive drum configured to be rotationally driven;
a second exposure head including a second plurality of light-emitting portions arranged in a direction along an axis of rotation of the second photosensitive drum, and configured to form an image corresponding to a second color on a surface of the second photosensitive drum by light emitted from the second plurality of light-emitting portions; and
at least one processor configured to:
(1) generate a first synchronization signal at a cycle in which the surface of the first photosensitive drum moves by a size of one pixel in the image corresponding to the first color in a direction of rotation of the first photosensitive drum;
(2) generate a second synchronization signal at a cycle in which the surface of the second photosensitive drum moves by the size of one pixel in the image corresponding to the second color in a direction of rotation of the second photosensitive drum; and
(3) cause the first exposure head to form one line of the image corresponding to the first color along the axis of rotation of the first photosensitive drum based on the first synchronization signal, and cause the second exposure head to form one line of the image corresponding to the second color along the axis of rotation of the second photosensitive drum based on the second synchronization signal.