Mobil pre-etched data carrier

Details Mobil pre-etched data carrier Mobil pre-etched data carrier

1985-07-22

1987-06-16

McElheny, Jr., Donald

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 46, G11B 700

Patent

active

046740813

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: 4322836 (1982-03-01), Kinjo et al.
patent: 4428075 (1984-01-01), Hazel et al.
patent: 4443870 (1984-04-01), Hazel et al.

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