Patent ID: 6154433
Filing Date: 2000-11-28
Classification: G11B

Abstract:
An optical head device adapted to be optically coupled to an optical disk, said device comprising:a first light source for emitting a first light beam;a second light source for emitting a second light beam;an objective lens for converging the first and second light beams to an optical disk and receiving a reflected light beam from said optical disk;a beam splitting means for splitting the reflected light beam into a first reflected light beam corresponding to said first light beam and a second reflected light beam corresponding to said second light beam;a first photodetector for detecting the first reflected light beam;a second photodetector for detecting the second reflected light beam; andan aperture limiter for blocking at least one of a stray light component included in the first reflected light beam to be detected by said first photodetector and a stray light component included in the second reflected light beam to be detected by said second photodetector.