Patent ID: 6757224
Filing Date: 2004-06-29
Classification: G11B

Abstract:
An integrated optical component for guiding a light beam, emitted from a light emitting element, to an optical disc and for separating a required light beam from reflected light from the optical disc, wherein said integrated optical component includes therein a plurality of optical surfaces and a diffraction grating, for extracting light beams required for tracking control and focus control from the reflected light, is formed in any one of the optical surfaces, wherein said diffraction grating is divided into three zones by two division lines parallel with a radial direction of the optical disc, that is, a center zone and two arcuated zones which are separated from each other in a tangential direction of the optical disc, and said center zone is further divided by a division line which is parallel with the tangential direction of the optical disc, into two D-like zones.