Optical pickup device for detecting tracking error of optical di

Details Optical pickup device for detecting tracking error of optical di Optical pickup device for detecting tracking error of optical di

1996-04-05

1998-09-29

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369 4437, 369 4429, G11B 709

Patent

active

058154736

ABSTRACT:
An optical pickup device includes an optical system which forms a main spot and a set of sub-spots on an optical disk by a beam of light passing the optical system. A photodetector unit outputs first signals in response to a reflection beam from the main spot, and outputs second signals in response to reflection beams from the sub-spots. A tracking error detector includes a first detection circuit designed to output a first tracking error signal for a first track pitch, and a second detection circuit designed to output a second tracking error signal for a second track pitch different from the first track pitch. A switch selectively connects one of the first detection circuit and the second detection circuit to an output of the tracking error detector in response to a track pitch of the optical disk, so that one of the first and second tracking error signals appropriate for the track pitch of the optical disk is output.

REFERENCES:
patent: 5148424 (1992-09-01), Wachi
patent: 5155717 (1992-10-01), Bakx
patent: 5216652 (1993-06-01), Yoshio et al.
patent: 5235583 (1993-08-01), Jongenelis et al.
patent: 5619482 (1997-04-01), Tezuka et al.
"A New Tracking Servo Method: Differential Push-Pull Method" by K. Ohsato, Dec. 18, 1986.

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