Optical scanning apparatus and image forming apparatus including optical scanning apparatus

Patent metadata

Field	Value
Publication number	US-8994768-B2
Application number	US-97375210-A
Country	US
Kind code	B2
Filing date	Dec 20, 2010
Priority date	Dec 22, 2009
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

In an optical scanning apparatus, a light source includes a plurality of light emitting elements. A light beam output from the source is scanned and deflected by a polygon mirror so as to form an electrostatic latent image on a surface of a light sensitive member. A control unit controls the source so that the source outputs the light beam in a first period before a second period in which the light beam deflected by the mirror forms the image. During the first period for outputting the light beam from the source a period for scanning a non-image region of the member in a state in which the rotation speed of the mirror is being accelerated or decelerated is made longer than a period for scanning the non-image region of the member in a state in which the rotation speed of the mirror is controlled at a constant speed.

First claim

What is claimed is:

1. An optical scanning apparatus, comprising:
a light source including a plurality of light emitting elements and configured to output a light beam from the plurality of light emitting elements based on image data for forming an electrostatic latent image on a photosensitive member;
a rotational polygon mirror configured to deflect the light beam so that the light beam moves on a surface of the photosensitive member;
a detection unit configured to detect th…

Assignees

• Kondo Shunsaku
• Canon Kk

Inventors

• Kondo Shunsaku

Classifications

• G03G15/326 Primary

  Physics · mapped topic

• G03G15/043

  Physics · mapped topic

• G03G15/0435

  Physics · mapped topic