Patent ID: 7126625
Filing Date: 2006-10-24
Classification: G02B

Abstract:
1. An optical scanning device, comprising: light source means for emitting at least one light flux having a wavelength of 500 nm or less; deflecting means for deflecting the at least one light flux emitted from the light source means; a first optical system for guiding the light flux emitted from the light source means to the deflecting means; and a second optical system for imaging the light flux deflected by the deflecting means on a surface to be scanned, wherein: one of the first optical system and the second optical system includes a diffraction grating; and provided that the total number of gratings of the diffraction grating is represented by m, an effective range of the diffraction grating is represented by L (mm), a minimum grating pitch of the diffraction grating is represented by P (μm), and the wavelength of the light flux is represented by λ (μm), the following expressions are satisfied: