Patent ID: 8174553
Filing Date: 2012-05-08
Classification: G03G

Abstract:
1. An apparatus for controlling power of a laser diode, which generates a control voltage by compensating for an optical power deviation of the optical power accumulated on a surface of a photosensitive drum of an image forming apparatus during a power control period and applies the control voltage to the laser diode during a printing period, the apparatus comprising: an output voltage sensing unit, which senses an output voltage of the laser diode corresponding to the size of each dot to be printed and which has been sampled during the power control period, and transmits the sensed output voltage; an output voltage control unit, which receives the transmitted output voltage and obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and proportionally integrates the error voltage to generate the control voltage; and an optical power compensation unit, which receives the generated control voltage and generates a compensated control voltage, to compensate for the optical power deviation on the photosensitive drum during the printing period, wherein the size of each dot to be printed is generated by applying a resolution algorithm to input binary data.