Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1994-10-03
1997-03-25
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 69, 360105, 318138, G11B 2102
Patent
active
056150644
ABSTRACT:
A digital storage system is disclosed in which a flying read/write head is loaded onto the surface of moving storage media with controlled velocity to avoid contact with the surface of the storage media. Head load velocity is detected by measuring the back EMF generated by the head arm actuator. Improved control and accuracy is obtained by breaking up the head arm actuator drive power into a series of pulses and measuring the back EMF induced into the low impedance voice coil of the head arm actuator in between pulses but only after the actuator current has been reduced to substantially zero in order to avoid interference by actuator current induced voltages.
REFERENCES:
patent: 3710213 (1973-01-01), Hansen
patent: 4168457 (1979-09-01), Rose
patent: 4480218 (1984-10-01), Hair
patent: 4755892 (1988-07-01), Carteau et al.
patent: 4786994 (1988-11-01), Carteau et al.
patent: 4864437 (1989-09-01), Couse et al.
patent: 4967291 (1990-10-01), Touchton et al.
patent: 5016121 (1991-05-01), Riddle et al.
patent: 5231549 (1993-07-01), Morehouse et al.
patent: 5430362 (1995-07-01), Carr et al.
Blank Timothy J.
Erickson Kevin J.
Greenberg Richard
Purkett John C.
Bussan Matthew J.
Cullen Larry T.
International Business Machines - Corporation
Knearl Homer L.
Sirr Francis A.
LandOfFree
Pulsed current velocity controlled head load method and apparatu does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pulsed current velocity controlled head load method and apparatu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pulsed current velocity controlled head load method and apparatu will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2208860