Optical reader for record carriers with different information de

Details Optical reader for record carriers with different information de Optical reader for record carriers with different information de

1994-05-25

1995-10-17

Sugarman, Scott J.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 47, 369124, 369116, G11B 700

Patent

active

054597048

ABSTRACT:
An optical reader for record carriers of a two types adapted for scanning with radiation beams. The information structures of the respective types are arranged in tracks. The structure of the second type has a phase structure in which effect areas alternate with intermediate areas, and is adapted for scanning with radiation of a wavelength longer than that for the first type. This reader scans both types with radiation of the first wavelength. An analog read signal is detected from radiation received from a scanned track. For reading the second type, first and second comparators supply respective detection signals if the differences between values of the read signals, separated by a given time interval, are greater than a given positive threshold or more negative than a given negative threshold. A signal recovery circuit derives a binary information signal from the first and second detection signals.

REFERENCES:
patent: 4719612 (1988-01-01), Kenjyo
patent: 5093820 (1992-03-01), Maeda et al.
patent: 5235583 (1993-08-01), Jongenelis et al.

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