Patent ID: 7180837
Filing Date: 2007-02-20
Classification: G11B

Abstract:
1. An optical pickup, comprising: a light source module for selectively generating a plurality of light beams with different wavelengths; an achromatic lens for converting the light beams into parallel beams; a beam splitter disposed on an optical path to pass the light beams therethrough and reflect the light beams; an optical modulator designed to divide each of incident light beams having passed through the beam splitter into multiple beams, and reflect and diffract the multiple beams in a direction of the beam splitter, the optical modulator comprising a substrate and a plurality of unit cells on the substrate, the unit cells being converted to correspond to wavelengths of the light beams generated by the light source module; an objective lens for focusing multiple beams, reflected and diffracted by the optical modulator and then reflected from the beam splitter in a direction of an optical disk, on corresponding tracks of the optical disk; and a photo detector for detecting multiple beams reflected from the tracks of the optical disk and converting the detected multiple beams into electrical signals.