Browse Prior Art Database

Actuator Brake

IP.com Disclosure Number: IPCOM000108565D
Original Publication Date: 1992-Jun-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Hancock, RA: AUTHOR [+2]

Abstract

The coarse actuator for an optical disk drive or hard disk drive must be locked in place when the drive is powered down or in a non-functioning mode to prevent actuator, head, or media damage and also to maintain the actuator in a known home position to improve drive start-up times.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Actuator Brake

       The coarse actuator for an optical disk drive or hard
disk drive must be locked in place when the drive is powered down or
in a non-functioning mode to prevent actuator, head, or media damage
and also to maintain the actuator in a known home position to improve
drive start-up times.

      Current coarse actuators in optical disk drives use a detent
system to keep the actuator in position when the actuator motion is
no longer needed, such as during the absence of a cartridge or during
drive shipping.  These detent locking systems usually have one or
more of the following problems: (1) tend to over-stress the bearing
systems because of the metal-to-metal contact and the possibility of
the detent mechanism not being ideally aligned at the time of its
actuation, (2) usually does not absolutely lock the actuator in place
but only restricts its motion, thus allowing the actuator to "rattle
around," and (3) usually controls position to only a few discrete
positions.

      This article defines an actuator brake system that does not
overstress the bearing system, locks the actuator in the same
position, does not allow for any motion under normal drive
conditions, and is actuated by the loader mechanism as the cartridge
is loaded and unloaded in the drive.

      The design consists of a formed sheet metal part that is
actuated by the loader mechanism via a cam that moves to lock or
unlock the actuator brake.  This sheet metal part has mount...