Patent ID: 7417777
Filing Date: 2008-08-26
Classification: G02B,H04N

Abstract:
1. An optical scanning device that scans a scanning surface using an optical beam, the optical scanning device comprising: a vertical-cavity surface-emitting laser that emits the optical beam; a coupling lens arranged on an optical path of the optical beam from the vertical-cavity surface-emitting laser, the coupling lens having a refraction plane and a diffraction plane that respectively change a power according to a temperature change and suppressing a beam-waist position change in a main-scanning direction and a sub-scanning directions on the scanning surface caused by the temperature change, by a wavelength change of the optical beam caused by power changes of the refraction plane and the diffraction plane and the temperature change; a deflecting unit that deflects the optical beam that passed through the coupling lens; and a scanning optical system that condenses a deflected optical beam on the scanning surface.