Patent ID: 8922613
Filing Date: 2014-12-30
Classification: G03G

Abstract:
1. A light beam scanning device comprising: a laser diode configured to emit an amount of light based on a value of drive current supplied thereto; a light amount-setting unit configured to set the amount of light to be emitted from the laser diode; a light amount detection unit configured to detect the amount of light emitted from the laser diode; a light amount control unit configured to control the amount of light to be emitted from the laser diode by adjusting the value of drive current supplied to the laser diode based on a detection output from the light amount detection unit; and a data correction unit configured to correct correction data for correcting the value of the drive current, wherein the data correction unit decides a light amount correction range in which the amount of light to be emitted amount is corrected based on a value of the correction data, calculates a slope of light emission characteristics representative of a correspondence relationship between the value of drive current and the amount of light to be emitted of the laser diode within the light amount correction range based on light amounts at two points within the light amount correction range and values of drive current associated with the light amounts at the two points, and corrects the correction data using the calculated slope, and wherein correction of the correction data is performed by multiplying the correction data by a ratio (η/η′) between a slope η of the light emission characteristics based on an assumption that the light emission characteristics of the laser diode are linear and a calculated slope η′ of the light emission characteristics of the laser diode.