Optoelectronic method of reading data on a magnetic medium and c

Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam

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369110, 369 46, 360114, G11B 1110

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active

045312052

ABSTRACT:
Optoelectronic method of reading the data retained on a magnetic medium (SM) on a plurality of tracks, receiving the data in the form of a plurality of luminous spots (ID.sub.i) projected onto a plane (P) where there are arranged a plurality of photoelectronic transducers aligned in at least one row (BTRPE.sub.ijl), at least two transducers (TRPE.sub.ij, TRPE.sub.(i+l)j) being associated with the same spot. A specified sampling instants the electrical image of the portion of the observed track is obtained in the form of a plurality of analog pulses (S'TRPE.sub.ij, S'TRPE.sub.(i+l)j) which are shifted in parallel, are then transferred into a register where they are shifted in series until an analog output signal (SSR.sub.1) is obtained, after which they are converted into a logic signal having a frequency equal to the frequency (f.sub.E) for writing the data on the magnetic medium SM.

REFERENCES:
patent: 4198701 (1980-04-01), Reddersen et al.
patent: 4245233 (1981-01-01), Lohstroh

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