Browse Prior Art Database

Reduced Contact Start Stop Mechanism

IP.com Disclosure Number: IPCOM000109796D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Harada, Y: AUTHOR [+3]

Abstract

Described herein is a mechanism for improving the durability of a hard disk drive of CSS (Contact Start Stop) type. According to this mechanism, when a spindle motor is powered off, an actuator arm moves to a position of the CSS area and then a head suspension gets on a spring- plate. Namely, the load force by the head suspension is reduced by the spring-plate at the CSS area, whereas the load force is high when the head flies over the disk surface.

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This is the abbreviated version, containing approximately 84% of the total text.

Reduced Contact Start Stop Mechanism

       Described herein is a mechanism for improving the
durability of a hard disk drive of CSS (Contact Start Stop) type.
According to this mechanism, when a spindle motor is powered off, an
actuator arm moves to a position of the CSS area and then a head
suspension gets on a spring- plate.  Namely, the load force by the
head suspension is reduced by the spring-plate at the CSS area,
whereas the load force is high when the head flies over the disk
surface.

      From the view point of CSS, a lower load force is better.
However, when a spindle motor is switched on and the head begins to
fly over the disk, a higher load force is better.

      This mechanism is very simple, and does not require any
additional electric power.

      Fig. 1 shows a linear actuator system.  1 is a head arm.  2 is
a spring-plate.  3 is a pole to fix the spring-plate.  4 is a
magnetic disk.  5 is a spindle motor.  6 is a linear actuator.

      Figs. 2 and 3 show the main part of the Reduced Contact Start
Stop Mechanism (RCSSM).  7 is a head suspension.  8 is a head slider.

      The spring coefficient of the head suspension is k.  That of
the spring-plate is -k' (k'>0).  The effective spring coefficient (or
total spring coefficient) is K.
      K = k - k'     ( k > k') (1)

      If k' is adequately selected, best performance can be achieved.
The head slider 8 still contacts the CSS area of the disk 4 with
re...