Apparatus for reading and/or recording a trackwise arranged opti

Details Apparatus for reading and/or recording a trackwise arranged opti Apparatus for reading and/or recording a trackwise arranged opti

1986-03-13

1988-03-08

Faber, Alan

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 44, 369109, 250202, G11B 7095

Patent

active

047302950

ABSTRACT:
An apparatus for reading and/or recording a trackwise arranged optical structure in a record carrier including a tracking-error detection system with a beam-splitting element and four detectors. The first detector and the second detector cooperate with a first of two sub-beams formed by the beam-splitting element, and the third detector and the fourth detector cooperate with the second sub-beam. It is demonstrated that for larger phase depths of the information details a very suitable tracking signal is obtained by adding the difference between the signals from the first and the second detector to the difference between the signals from the third and the fourth detector.

REFERENCES:
patent: 4074314 (1978-02-01), Velzel
patent: 4209804 (1980-06-01), Dil
patent: 4363116 (1982-12-01), Kleuters
patent: 4455632 (1984-06-01), Broot
patent: 4556967 (1985-12-01), Broot
patent: 4568887 (1986-02-01), Bierhoff

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