Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1996-05-30
1998-01-13
Tran, Thang V.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4426, 369 4429, G11B 709
Patent
active
057086362
ABSTRACT:
A tracking error signal generation device is used for an optical pickup device capable of reproducing and/or recording an information signal on a spiral or coaxial signal track of a disk shaped optical record medium of one type among a plurality of optical record media of different types which track pitches are different from each other. The optical pickup device has a light beam irradiation device for irradiating the optical record medium with three light beams; and light detection devices for receiving a reflection light of each light beam. The tracking error signal generation device is provided with: a first operation device for calculating a first tracking error signal according to the three beams method; a second operation device for calculating a second tracking error signal according to a DPP (Differential Push Pull) method; and a selecting device for selecting one of the first tracking error signal and the second tracking error signal on the basis of an instruction from the external.
REFERENCES:
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 5216652 (1993-06-01), Yoshio et al.
patent: 5235583 (1993-08-01), Jungenelis et al.
patent: 5619482 (1997-04-01), Tezuka et al.
Inoue Akiyoshi
Ishii Hidehiro
Muramatsu Eiji
Nagahara Shinichi
Tahata Fumikazu
Pioneer Electronic Corporation
Tran Thang V.
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