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Ramp structure for L/UL Hard disk drive with inertial latch

IP.com Disclosure Number: IPCOM000013326D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Abstract

Disclosed is ramp structure of Hard Disk Drive (HDD) with Load/Unload technology to improve anti-rotational shock resistance for depop model. (Figure) HDD with Load/Unload technology has latch mechanism to prevent head/disk stiction by rotational shock. This latch mechanism well works when high rotaional G shock. In case of low rotaional G shock with long duration, latch mechanism does not work correctly. And in case of depop model (less number of head), friction of ramp/suspension is lower than full model (full number of head). So actuator can move easily by low rotaional G shock. To improve anti-rotaional shock (especially for low G shock with long duration), it need to increase ramp/suspension friction. To increase ramp/suspension friction, it need to increase the angle of ramp at initial engauge. ("A" and "B" in Figure)

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Ramp structure for L/UL Hard disk drive with inertial latch

       Disclosed is ramp structure of Hard Disk Drive (HDD) with
Load/Unload technology to
improve anti-rotational shock resistance for depop model. (Figure)

        HDD with Load/Unload technology has latch mechanism to prevent
head/disk stiction
by rotational shock. This latch mechanism well works when high
rotaional G shock. In
case of low rotaional G shock with long duration, latch mechanism
does not work
correctly. And in case of depop model (less number of head),
friction of ramp/suspension
is lower than full model (full number of head). So actuator can
move easily by low
rotaional G shock.

        To improve anti-rotaional shock (especially for low G shock with
long duration), it need
to increase ramp/suspension friction.

        To increase ramp/suspension friction, it need to increase the
angle of ramp at initial
engauge. ("A" and "B" in Figure)

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        If increase the angle of all of initial engauge, it's too high
friction to load actuator by

        VCM current in full model.
The solution of this problem, to increase the angle of slope only
at depop model head.

         In figure, the angle "B" is bigger than the angle "A".
If the friction of ramp/suspension at slope "B" is x1.5 of "A",
total ramp/suspension are
as follows.

        10heads model (all "A") : 1x10=10
10heads model (7 out of 10 are "A", 3 out of 10 are "B") :
1x7+1.5x3=11.5

11.5/10=115%

          5heads model (all "A") : 1x5=5
5heads model (2 out of 5 are "A...