Servo head positioner using VCO and counter for digitizing posit

Details Servo head positioner using VCO and counter for digitizing posit Servo head positioner using VCO and counter for digitizing posit

1986-08-11

1988-09-06

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318696, G11B 5596, G11B 2110

Patent

active

047697253

ABSTRACT:
A servo control apparatus which can accurately control the head with a simplified structure has a voltage controlled oscillator which is controlled in accordance with servo information stored in a servo data region of the disk, and a reversible counter which counts an output signal of the voltage controlled oscillator to convert it to a digital signal corresponding to the amount of deviation of the head from a target track. The digital signal is used for position control for accurate positioning of the head.

REFERENCES:
patent: 3201781 (1965-08-01), Holland
patent: 3868677 (1975-02-01), Kidd
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4414586 (1983-11-01), Hirota et al.
patent: 4462053 (1984-07-01), Lum et al.
patent: 4488187 (1984-12-01), Alaimo
patent: 4498129 (1985-02-01), Velazquez
patent: 4516162 (1985-05-01), West
patent: 4542428 (1985-09-01), Yauagi
patent: 4586094 (1986-04-01), Chambors
Electronic Analog/Digital Conversions, Hermann Schmid, Van Nostrand Reinhold Company, p. 292.

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