G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.3
G11B 21/08 (2006.01) G11B 5/55 (2006.01) G11B 7/085 (2006.01) G11B 19/20 (2006.01)
Patent
CA 1269753
ABSTRACT OF THE DISCLOSURE Electronic circuitry is provided to position the read/ write heads in a designated landing zone when the elec- trical power is removed from the drive. When power is removed from the drive, the stored energy of the rotating spindle motor is used as a source of electrical power and timing pulses to the stepper motor which drives the actu- ator of the disc drive. The power generated by the spin- dle motor as it spins down is referred to as "back EMF." A sequencer circuit is provided to couple the power and clock pulses to selected windings of the stepper motor in an order that will cause the stepper motor to rotate in the direction necessary to move the transducer heads to a predetermined park position at the inner diameter of the disc whenever power is removed from the disc drive. Since the location of the heads at power down may not be known, the timing of the pulses is such that a sufficient number of steps will be taken to move the transducer heads to the parking zone within the time alloted even if power down occurred when the heads were at the outermost track. Step pulses will continue to be generated until the back EMF of the spindle motor is insufficient to generate such pulses. After the transducer heads are at the predeter- mined parking location, any additional steps will cause the actuator to contact a mechanical "inner crash stop" designed to prevent damage to the transducer heads from contact with the clamp which retains the discs.
523320
Battu Ramgopal
Krause James N.
Wevers William E.
Battu Ramgopal
Krause James N.
Seagate Technology
Smart & Biggar
Wevers William E.
LandOfFree
Method and means for parking read/write heads in a disc... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and means for parking read/write heads in a disc..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and means for parking read/write heads in a disc... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1281288