Patent ID: 7408567

Claim:
A light beam scanning apparatus, comprising: a modulator producing a modulated signal of a pulse width decided based on given image data; a light generator capable of generating a light beam in response to the modulated signal; a scanner periodically and spatially scanning the light beam generated by the light generator, along a second direction orthogonal to a predetermined first direction at a predetermined position in the first direction; a power detector detecting information indicative of a power of the light beam scanned by the scanner; and a pulse width adjuster adjusting a pulse width of the light beam to be generated based on the information detected by the power detector, wherein the power detector is provided with a sensor receiving the light beam to output, as the information, an electrical signal depending on the received light beam, the sensor being spatially disposed at a position corresponding to a scanning position of the light beam in the first direction, wherein the light beam consists of a plurality of light beams, wherein the power detector detects the information by sequentially integrating each of the plurality of the light beams during a period in which the light beams pass through an area of the sensor, and wherein the pulse width adjuster is configured to adjust the pulse widths of the plurality of light beams which are to be generated so that the pulse widths of the light beams become equal to each other.