Patent ID: 8427911

Claim:
An optical pickup that reproduces information from an optical disc having at least two information layers, the optical pickup comprising: a light source that emits an optical beam; an objective lens that converges the optical beam upon a predetermined information layer from which desired information is to be reproduced in the optical disc; a diffraction grating that divides the optical beam reflected from the predetermined information layer of the optical disc that is to be used for the reproduction, into a plurality of optical beams according to region of the optical beam; and a detector that includes a plurality of photo-receivers for receiving the plurality of optical beams; wherein: the detector includes, as the plurality of photo-receivers, a plurality of photo-receivers for generating a tracking control signal, a focusing control signal, and a reproduction signal; and plus/minus-first-order optical beams obtained by division in any region of the diffraction grating, and second-order and higher-order optical beams obtained by division in other regions are arranged at different positions on the detector.