×

Image Forming Apparatus and Method of Controlling Beam Scanning Device

  • US 20160282749A1
  • Filed: 03/23/2016
  • Published: 09/29/2016
  • Est. Priority Date: 03/23/2015
  • Status: Active Grant
First Claim
Patent Images

1. An image forming apparatus, comprising:

  • a first light beam source and a second light beam source;

    a polygon mirror configured to deflect a first beam emitted from the first light beam source and a second beam emitted from the second light beam source;

    a first scanning optical system disposed on one side of the polygon mirror and configured to focus the first beam deflected by the polygon mirror on a first photoconductor;

    a first optical sensor disposed at an upstream portion of the first scanning optical system in a scanning direction of the first beam and configured to detect the first beam detected by the polygon mirror;

    a second scanning optical system disposed on another side of the polygon mirror and configured to focus the second beam deflected by the polygon mirror on a second photoconductor;

    a second optical sensor disposed at a downstream portion of the second scanning optical system in a scanning direction of the second beam and configured to detect the second beam deflected by the polygon mirror; and

    a controller,wherein the controller is configured to determine a second-beam exposure standby time which is a time period from a timing when the first beam deflected by a first surface of the polygon mirror has been detected by the first optical sensor to a timing when scanning exposure of the second beam deflected by a second surface of the polygon mirror different from the first surface is started, based on a measured time which is a time period from the timing when the first beam deflected by the first surface has been detected by the first optical sensor to a timing when the second beam deflected by the second surface is detected by the second optical sensor, andwherein the controller is configured to start the scanning exposure of the second beam deflected by the second surface when the second-beam exposure standby time elapses after the first beam deflected by the first surface has been detected by the first optical sensor.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×