US 12,306,554 B2
Image forming apparatus including exposure head provided with plurality of light emitting chips
Yasutomo Furuta, Chiba (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Mar. 21, 2024, as Appl. No. 18/612,202.
Application 18/612,202 is a continuation of application No. 18/120,084, filed on Mar. 10, 2023, granted, now 11,977,342.
Claims priority of application No. 2022-048422 (JP), filed on Mar. 24, 2022.
Prior Publication US 2024/0231254 A1, Jul. 11, 2024
Int. Cl. G03G 15/043 (2006.01); G03G 15/04 (2006.01); G06K 15/02 (2006.01)
CPC G03G 15/043 (2013.01) [G03G 15/04036 (2013.01); G03G 15/04045 (2013.01); G03G 15/04054 (2013.01); G06K 15/027 (2013.01); G03G 2215/0407 (2013.01); G03G 2215/0412 (2013.01); G03G 2215/0426 (2013.01); G03G 2215/0429 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An image forming apparatus, comprising:
a photosensitive member that is driven to rotate;
an exposure head including at least one light emitting chip, the at least one light emitting chip including a plurality of light emitting elements that are placed at different positions in a direction along a rotation axis of the photosensitive member, a digital-analog converter that outputs a voltage corresponding to a setting value as a digital value, and a circuit unit that supplies a current to the plurality of light emitting elements based on the voltage output from the digital-analog converter; and
at least one processor configured to:
set a value that has been decided on so that one light emitting element included among the plurality of light emitting elements emits light of a predetermined amount as the setting value in the at least one light emitting chip,
generate image data for causing the plurality of light emitting elements to emit light, and
correct the image data such that a number of the plurality of light emitting elements that emit light changes,
wherein the circuit unit supplies a current to each of the plurality of first light emitting elements based on the corrected image data.