Optical pickup device for detecting a tracking error of a main s

Details Optical pickup device for detecting a tracking error of a main s Optical pickup device for detecting a tracking error of a main s

1997-11-13

1999-10-05

Hindi, Nabil

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, 369110, 369109, 369 4437, G11B 700

Patent

active

059635150

ABSTRACT:
An optical pickup device includes a light source which emits a light beam. A beam converting system converts the light beam emitted by the light source into a main beam and four side beams so that a main spot and first through fourth side spots are provided on the disk by the main beam and the side beams. The first and the second side spots are at preceding positions to the main spot and the third and the fourth side spots are at following positions to the main spot. The first and the fourth side spots are symmetrical about the main spot and the second and the third side spots are symmetrical about the main spot. A photodetector receives reflection beams of the first through the fourth side spots and outputs signals indicating intensities of the reflection beams of the first through the fourth side spots. A tracking error detector outputs a tracking error signal in response to the signals output from the photodetector.

REFERENCES:
patent: 5751680 (1996-12-01), Ishibashi et al.
Ohsato, K., "A New Tracking Servo Method: Differential Push-Pull Method", pp. 127-132, Optical Sumposium, 1986, Dec.

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