Browse Prior Art Database

Actuator Lock for Smooth Rotation

IP.com Disclosure Number: IPCOM000119172D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 58K

Publishing Venue

IBM

Related People

Matsumura, Y: AUTHOR

Abstract

Disclosed is a movable lock mechanism which holds an actuator when shock is applied to Hard Disk Drives (HDDs). The mechanism is shown in Fig. 1. The mechanism has already been applied for a patent. This disclosure adds a new invention to improve shock resistance.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 98% of the total text.

Actuator Lock for Smooth Rotation

      Disclosed is a movable lock mechanism which holds an actuator
when shock is applied to Hard Disk Drives (HDDs).  The mechanism is
shown in Fig. 1.  The mechanism has already been applied for a
patent.  This disclosure adds a new invention to improve shock
resistance.

      When counter-clockwise rotational shock is applied to HDDs,
Fig. 1, the actuator rotates clockwise.  When the shock is strong
enough to rotate the actuator to the data zone of disks, the spindle
motor cannot rotate disks because of sticking force between heads and
disks.  When clockwise rotational shock is applied to HDDs, Fig. 1,
the actuator rotates counter-clockwise.  When the shock is strong
enough to bounce the actuator to the data zone of disks, the spindle
motor cannot rotate disks because of sticking force between heads and
disks.  Consequently, an actuator lock mechanism is necessary to hold
the actuator.

      This actuator lock consists of a magnet and a magnet case with
a spring.  A steel tip (item 18 of Fig. 1) is attached to the
actuator and a magnet pulls the steel tip.  This magnetic force works
as a lock.  Fig. 2 shows the assembly.

      This invention presents a new shape of the magnet case so that
it can rotate smoothly.  The shape is shown in Fig 3.  A portion of
the round magnet case is cut.

      With this invention, shock resistance improved 10% for the
counter-clockwise rotational shock and 50% for the clo...