Patent ID: 6178151
Filing Date: 2001-01-23
Classification: G11B

Abstract:
An optical head, comprising:a light source;a photodetector for generating a prescribed signal based on light which the photodetector receives;a converging optical system for converging a light beam emitted from the light source to be incident upon a prescribed reflective member; anda reproducing optical system for guiding reflected light from the prescribed reflective member to the photodetector,wherein the reproducing optical system is configured for converging light on a prescribed converging point,a filter having a light transmissive region for allowing light in the vicinity of a center of the converged light to selectively pass therethrough is provided in the vicinity of the converging point, andthe light transmissive region of the filter is formed by light which has passed through at least a part of the reproducing optical system and has been converged.