Magnetic head load control system

Details Magnetic head load control system Magnetic head load control system

1978-08-31

1980-05-06

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2112

Patent

active

042020204

ABSTRACT:
A control system for applying a magnetic head onto a magnetic disk in random places thereon including a free running oscillator and switching means responsive to pulses from said oscillator and a head load command signal derived from the disk during a revolution thereof for initiating the energization of a head engaging solenoid. The system includes a capacitor which is charged at various rates to produce an initial fast rising current in the solenoid for moving the head into close proximity with the disk, a slowly rising subsequent current in the solenoid for engaging the head with the disk gradually, and a final fast rising current in the solenoid for completing the engagement of the head on the disk.

REFERENCES:
patent: 3333065 (1967-07-01), Torok
patent: 3491350 (1970-01-01), Linsley
patent: 3641527 (1972-02-01), Gyl
patent: 3751603 (1973-08-01), Prieur et al.
patent: 4030132 (1977-06-01), Ifikar et al.

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