Patent ID: 7961211

Claim:
An optical scanning device comprising: a light source; a pixel clock generating unit configured to modulate a phase of a pixel clock and a drive time period of the pixel clock corresponding to scanning positions on a scan target surface; a pulse width information memory storing pulse width information corresponding to drive time periods of the pixel clock generated by the pixel clock generating unit; a light source driving unit configured to modulate/drive an intensity of a light beam emitted from the light source based on the pulse width information corresponding to drive time periods of the pixel clock generated by the pixel clock generating unit; a deflecting unit comprising a reflection surface configured to deflect/scan a light beam from the light source; and a scan-imaging optical system configured to image the light beam deflected by the deflecting unit on the scan target surface, wherein the deflecting unit further comprises a rotatable shaft and the reflection surface deflects the light beam as the rotatable shaft reciprocally oscillates the reflection surface, and the pixel clock generating unit modulates the pixel clock such that the drive time at peripheral portions along a scanning width of the scan target surface is shorter than the drive time at a center portion of the scanning width of the scan target surface.