Patent ID: 6025866
Filing Date: 2000-02-15
Classification: B82Y,G02B,G11B

Abstract:
An optical pickup apparatus, comprising:a laser;an objective lens focusing a laser beam from said laser onto an optical recording medium;a polarization plane rotary unit arranged between said laser and said objective lens for passing through the laser beam from said laser without rotating the plane of polarization of at least a portion other than a center portion of the laser beam at the time of reproduction; anda blocking element arranged between said polarization plane rotary unit and said objective lens for blocking the center portion of the laser beam from said polarization plane rotary unit and passing through the remaining portion of the laser beam,wherein said polarization plane rotary unit passes through said laser beam without rotating the plane of polarization of the entire laser beam at the time of recording, and passes through said laser beam with the plane of polarization of the center portion of said laser beam rotated and without rotating the plane of polarization of the remaining portion of the laser beam at the time of reproduction.