Patent ID: 7294824
Filing Date: 2007-11-13
Classification: G02B

Abstract:
1. A light beam scanning device, comprising: a light emission source configured to emit a light beam with which the light beam scanning device performs scanning; a deflection part configured to deflect the light beam emitted from the light emission source in a main scanning direction with a plurality of deflection surfaces thereof; first and second light beam detection parts configured to detect the light beam deflected by the deflection part at first and second positions, respectively, outside an image area on opposite sides thereof in the main scanning direction; a time difference measurement part configured to measure a time difference between the detection of the light beam by the first light beam detection part and the detection of the light beam by the second light beam detection part; and a control part configured to perform control so as to correct image magnification in the main scanning direction in the image area from the time difference measured by the time difference measurement part, wherein the control part performs control so that an amount of light of the light beam at a time of detecting the light beam by the first and second light beam detection parts is constant.