OPTICAL INFORMATION PROCESSOR

摘要

PURPOSE:To permit high-speed information recording of multiple gradations and multiple values with simple constitution and to permit halftone copying and increase in the capacity of an optical disk by providing a semiconductor laser, wavelength changing means and imaging optical system and driving the wavelength changing means by a multiple gradation signal. CONSTITUTION:Laser light emitted from the semiconductor laser 1 is made to parallel luminous fluxes by a collimate lens 2 and the fluxes are deflected by a rotary polygon mirror 4 rotating in the direction of an arrow 3 so as to image a spot 7 on the surface of a photosensitive drum 6 by an imaging lens 5. A power source 8 changes the current to be passed to the semiconductor laser 1 by the multiple-gradation recorded information to change the wavelength of the semiconductor laser 1. The laser light emitted from the semiconductor laser 41 is made to the parallel luminous fluxes by the collimate lens 2 and the spot 45 is imaged on the surface of the disk 44 by a stopping down lens 43 in the case of using this device for an optical disk device. The light reflected from the disk 44 is conducted by a lambda/4 plate 46 and a polarizing beam splitter 47 to a known out of focus detecting system 48.