Patent Number: 7,088,381

Title: Image forming apparatus and method of controlling the image forming apparatus

Abstract: A color image forming apparatus and laser pulse width adjustment method can shorten the time required for laser pulse width adjustment with low cost. In a color image forming apparatus in which a plurality of laser scanners scan and expose a plurality of photosensitive drums with laser beams pulse-width modulated according to image data, the scanner phases of the laser scanners in which no color misregistration occurs are recorded, the phases of the laser scanners are changed to a specific phase relationship for laser pulse width adjustment, laser pulse width adjustment is executed, and the phases of the laser scanners are then restored to the recorded scanner phases in which no color misregistration occurs.

Inventors: Hirasawa; Hideaki (Shizuoka, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: B41J 2/435 (20060101)

Expiration Date: 8/08/02018