US Patent 7982906 Optical scanning device, image display device and retinal scanning display

An optical scanning device is constituted without using any arc sin .theta. correction lens, while maintaining quality of an image. The optical scanning device comprises an optical flux generator, a resonance-type deflection element, a drive signal generator and a dot clock generator that is configured to sequentially generate dot clocks which satisfy a first, second and third condition, wherein the optical flux generator radiates the optical fluxes having brightnesses corresponding to the clock cycles of the dot clocks generated by the dot clock generator.