Browse Prior Art Database

Disk Drive Actuator Lock With Low Power Hold Circuit

IP.com Disclosure Number: IPCOM000037621D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hanson, CC: AUTHOR [+2]

Abstract

The actuator lock is designed to hold the actuator of a disk drive in the head landing zone at power-down to prevent damage to data areas of the disk. At power-up when the disk has attained the proper rotational speed, the lock is "picked" and moved to the hold position where it does not interfere with the actuator during normal operation. When the lock is stabilized in the hold position. The magnetic circuit and the mechanical hardware are designed such that the lock will safely maintain this hold position at the lower current under all vibration and operating conditions.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Disk Drive Actuator Lock With Low Power Hold Circuit

The actuator lock is designed to hold the actuator of a disk drive in the head landing zone at power-down to prevent damage to data areas of the disk. At power-up when the disk has attained the proper rotational speed, the lock is "picked" and moved to the hold position where it does not interfere with the actuator during normal operation. When the lock is stabilized in the hold position. The magnetic circuit and the mechanical hardware are designed such that the lock will safely maintain this hold position at the lower current under all vibration and operating conditions.

The improved circuit employing this lock, which is designed such that the hold current is provided by the +5-volt supply, is shown in Fig. 1. When "power good" goes minus at power-up, the coil is driven positive through D1 and T2. When -pick is energized, the coil is driven to approximately +12 volts through T1 and the actuator lock is picked. Diode D1 is back biased and the hold circuit is not active during pick. When the Pick Transistor T1 is turned off again, the coil voltage falls back and is held at the hold level of approximately +5 volts.

(Image Omitted)

Disclosed anonymously.

1