Method of writing and reading information on and from optical ca

Details Method of writing and reading information on and from optical ca Method of writing and reading information on and from optical ca

1992-12-02

1994-12-20

Pascal, Robert J.

Dynamic information storage or retrieval

Alternative diverse types of storage or retrieval

369 32, 369 47, 369 4437, 235454, G11B 586

Patent

active

053751124

ABSTRACT:
In a method of writing and reading information on and from an optical card, to record new data immediately after an end of a previously recorded area without providing a gap therebetween, a timing of a write command signal is adjusted in accordance with a distance between writing and reading light spots on the optical card. The distance between the writing and reading light spots is measured by utilizing these light spots. A pit is formed on the optical card by the writing light spot, and the thus formed pit is detected by the reading light spot. Then, the distance may be measured by deriving a product of a constant moving speed of the optical card and a time period from an instant at which the pit is recorded to an instant at which the relevant pit is detected. An undesired bit jitter can be removed, while various optical systems of an optical head can be assembled easily; thus, a manufacturing cost of the optical head can be reduced.

REFERENCES:
patent: 4056712 (1977-11-01), Trenkamp et al.
patent: 4609812 (1986-09-01), Drexler
patent: 4894817 (1990-01-01), Tanaka et al.
T. Ishida, et al "High Speed Optical Card Reader/Writer using Two Optical Sources", Electronic Information Communication Society, 1989, Autumn, C-325, p. 4-265.

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