Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-11-29
1988-07-05
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360105, 318331, 318561, G11B 2102, G11B 554, G05B 1900
Patent
active
047558920
ABSTRACT:
A magnetic disk memory is moved between a first position beyond the disk periphery to a second position proximate the disk periphery while the head is at an idle height above the disk face. The head is moved between the disk periphery and a third position at the edge of an area on the disk where data are located while the head is lowered and raised between the idle height and a hovering height above a face of the disk. An assembly carrying the head includes a radially extending arm, turned by a rotary DC motor. A continuous step excitation waveform is supplied to the motor as the head is driven between the first and second positions until the head arrives at one of the two positions. Each of the steps has a constant amplitude that differs from the immediately preceding step by a predetermined incremental value. All of the steps, except the last step, has the same predetermined duration. The last step has a time duration no greater than that of the previous steps and determined by when the head arrives at the one position. To drive the head between the second and third positions a damping impulse having a predetermined constant amplitude and duration is applied to the motor to cause the motor to stop. The motor is stopped without overshoot and driven to a predetermined speed by then applying a decreasing ramp excitation waveform to it.
REFERENCES:
patent: 4202020 (1980-05-01), Lougren et al.
patent: 4571648 (1986-02-01), Barski
patent: 4660106 (1987-04-01), Harrison et al.
patent: 4675586 (1987-06-01), Eigner et al.
IBM Technical Disclosure Bulletin, vol. 25, No. 3A, 8/83, pp. 1244-1246.
IBM Technical Disclosure Bulletin, vol. 26, No. 1, 6/83, pp. 376-377.
IBM Technical Disclosure Bulletin, vol. 22, No. 6, 11/79, pp. 2501-2504.
Carteau Daniel
Couette Jean-Jacques
Maury Christian
Tam Pham D.
Cardillo Raymond F.
CII Honeywell Bull
Garland Steven R.
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