Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1998-08-10
2000-02-08
Dinh, Tan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4442, 369 94, 369120, G11B 700
Patent
active
060234490
ABSTRACT:
An optical pickup which include a light source; an optical path changing portion to change a path of light emitted from the light source; an objective lens to converge the light from the optical path changing portion to form a light spot on a recording surface of a disk; and a photodetector having at least two light-receiving regions, preferably four light-receiving regions in a 2.times.2 matrix, which separately perform photo-electric conversion, for receiving the light which has passed through the optical path changing portion and the objective lens and been reflected from the disk. The light-receiving regions are separated by a predetermined distance, such that a center region of the light is not received by the light-receiving regions.
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patent: 5537384 (1996-07-01), Lee et al.
patent: 5802037 (1998-09-01), Lee et al.
Chu Kim-Kwok
Dinh Tan
Samsung Electronics Co,. Ltd.
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