Optical scanning for record carriers adapted for reading with di

Details Optical scanning for record carriers adapted for reading with di Optical scanning for record carriers adapted for reading with di

1992-02-25

1993-08-10

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4427, 369 4429, 369 4437, G11B 700

Patent

active

052355837

ABSTRACT:
A device in which a radiation source generates a radiation beam of a first wavelength. The scanning spot 7 generated by this radiation beam follows the centerline 13 of a track 8 to be scanned on a first type of record carrier designed for this wavelength. When a second type of record carrier is being read, in which the information is stored in a phase structure designed for a wavelength which is longer than the first wavelength, the read spot 7 follows the edge of a track 38 to be read instead of the centerline 18. In this way it is possible to generate a satisfactory information signal not only from the first type of record carrier but also from the second type of record carrier.

REFERENCES:
patent: 3876842 (1975-04-01), Bouwhuis
patent: 4491940 (1985-01-01), Tinet
patent: 4754339 (1988-06-01), Nagai et al.
patent: 4843601 (1989-06-01), Eguchi et al.

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