Optical scanning system for a sinusoidal data track

Details Optical scanning system for a sinusoidal data track Optical scanning system for a sinusoidal data track

1992-01-16

1993-09-21

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4426, 369 4437, 3692751, G11B 700

Patent

active

052475077

ABSTRACT:
An optical scanning system for a compact disc having a sinusoidal data track radially meandering, at a selected frequency, about the axis of rotation of the disc includes a first laser beam for reading data from the data track. A +1 level laser beam and a -1 level laser beam respectively track the opposite edges of the data track and generate a tracking error signal. The +1 level laser beam and the -1 level laser beam are separated, with respect to the disc, by a distance equal to an odd integer multiple of one half the wavelength corresponding to the selected frequency. The +1 and -1 laser beams are not modulated by the sinusoidal data track and standard tracking circuitry can be used to track the data track.

REFERENCES:
patent: 4972401 (1990-11-01), Carasso et al.
J. Nijof, An integrated approach to CD-players, Electronic Components & Application, vol. 6, No. 4, 1984, pp. 209-215.

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