Mobile pre-etched data carrier and an optical tracking device us

Details Mobile pre-etched data carrier and an optical tracking device us Mobile pre-etched data carrier and an optical tracking device us

1983-03-07

1985-11-12

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369275, 369 48, G11B 700

Patent

active

045532281

ABSTRACT:
A mobile pre-etched data carrier is provided in which the pre-etching is formed by a succession of discrete non continuous elements materializing the mean axis of the tracks. The spatial distribution of these discrete elements may be uniform or not. In a first embodiment, each discrete element is formed by a smooth track section. In a second embodiment, each discrete element comprises several sections defining a particular code. In other preferred variations of the invention, each element comprises, besides a portion centered on the mean axis of the tracks, one or more portions offset with respect to the axis. Finally, each of the pre-etchings may itself be preceded by an additional pre-etching element used for the purpose of synchronization. The tracking device comprises photodetector means, measuring circuits comprising sampler-inhibitors or storage integrator circuits and sampling circuits. A radial tracking error is formed from the evolution of the signals detected during successive passages.

REFERENCES:
patent: 3919697 (1975-11-01), Walker
patent: 4094013 (1978-06-01), Hill et al.
patent: 4375088 (1983-02-01), de Haan et al.
patent: 4428075 (1984-01-01), Hazel et al.
patent: 4443870 (1984-04-01), Hazel et al.

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