Controlling the trace of a rotary head

Details Controlling the trace of a rotary head Controlling the trace of a rotary head

1981-11-03

1984-04-17

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 102, 360 70, G11B 552, G11B 2104

Patent

active

044438230

ABSTRACT:
The position of a rotary head mounted on a deflection device is controlled as the head scans successive tracks on a record medium. Tracking drive signals are generated as a function of the deviation of the head relative to a track scanned thereby. The tracking drive signal is sampled at successive locations along the trace. Previously stored samples are compared to the successively produced samples, and any difference is used to correct the stored sample by a predetermined amount irrespective of the actual difference. Hence, the stored samples gradually are corrected to represent the configuration of the tracks scanned by the rotary head. When the head reproduces signals from the record medium, the generated tracking drive signals are used to control the deflection device so as to make the head coincident with the track being scanned thereby. When the head is used to record signals, the stored samples are used to control the deflection device before such samples are corrected. For recording the stored samples may be compared to reference samples, and gradually are corrected to conform to the reference samples, and used to control the deflection device so that the traces gradually conform to the configuration represented by the reference samples.

REFERENCES:
patent: 4148083 (1979-04-01), Watanabe
patent: 4149199 (1979-04-01), Chick et al.

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