Read and/or write device

Details Read and/or write device Read and/or write device

1990-10-10

1992-08-18

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 360 7804, G11B 700

Patent

active

051405741

ABSTRACT:
A read and/or write device for a record carrier having tracks which extend substantially parallel to each other. A read and/or write head for scanning the tracks is moved by a positioning system in a direction transverse to the tracks. During such movement a counter derives the number of tracks traversed per unit time from the number of reference level crossings of a periodic signal V.sub.sp having a frequency corresponding to the track crossing frequency. Counting of spurious level crossings is inhibited by blocking the counter during a blocking interval (tbl) following each level crossing which is counted. The speed of the read and/or write head is controlled on the basis of the counted level crossings.

REFERENCES:
patent: 4794579 (1988-12-01), Baas
patent: 4855977 (1989-08-01), Getreuer et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4868819 (1989-09-01), Kimura
patent: 4887253 (1989-12-01), Tateishi

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