Process and system for optical recording and reading on a mobile

Details Process and system for optical recording and reading on a mobile Process and system for optical recording and reading on a mobile

1983-06-13

1985-12-24

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 46, 369275, 369124, G11B 700

Patent

active

045610827

ABSTRACT:
A process and device for focussing a light energy beam on a data carrier comprising sites formed of virgin areas free from any data recording provided along tracks and serving as reference plane for said focussing. In a preferred variation, these areas are preceded by flags associated with a specific code. Control is achieved by measuring the deviation between the plane of focussing of a beam into a spot scanning the tracks and the reference plane formed by the surface of the virgin areas. Between two passages of these areas the measurements are stored. The focussing error signal is obtained by filtering these measurements.

REFERENCES:
patent: 3919697 (1975-11-01), Walker
patent: 4402061 (1983-08-01), Hazel et al.
EP-A-0 019 379 (Xerox Corporation), p. 2, lines 3-21; p. 3, line 20--p. 6, line 17; p. 7, line 23; p. 8, line 7.
EP-A-0 050 967 (Olympus Optical Co. Ltd.), p. 16, line 18--p. 24, line 6.
Neues aus der Technik, No. 5, Oct. 15, 1979, (Wurzburg, DE), p. 2.
Patent Abstracts of Japan, vol. 2, No. 64, (E-33), May 1978, p. 2100E78.
Patent Abstracts of Japan, vol. 4, No. 134, (P-28) (616), Sep. 19, 1980, p. 9P28.

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