Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1983-05-12
1985-06-18
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 555
Patent
active
045243980
ABSTRACT:
A velocity control system for a magnetic disc apparatus has: a circuit for generating a two-phase position signal which is used to determine the position of the magnetic head; an A/D converter for converting the two-phase position signal to a digital signal; a microprocessor for computing a target velocity and a real velocity which correspond to a distance between the target track and the current position of the magnetic head in accordance with the digital signal, and for computing a velocity difference between the target velocity and the real velocity; a D/A converter for converting a signal corresponding to the velocity difference to an analog signal; and a linear motor for driving the magnetic head to control the seek velocity of the magnetic head, in accordance with the analog signal.
REFERENCES:
patent: 4048660 (1977-09-01), Dennison et al.
patent: 4096579 (1978-06-01), Black et al.
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4390912 (1983-06-01), Hertrich et al.
patent: 4462053 (1984-07-01), Lum et al.
IEEE Transactions on Magnetics, vol. MAG-17, No. 4, Jul. 1981, High Track Density for Magnetic Disk Drives with an `Embedded Servo` Positioning System, C. Maury, pp. 1396-1402.
Stellar George G.
Tokyo Shibaura Denki Kabushiki Kaisha
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