Browse Prior Art Database

Clip for Preventing Electrostatic Discharge Damage

IP.com Disclosure Number: IPCOM000036806D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Gilliland, DA: AUTHOR [+2]

Abstract

The described electrostatic discharge (ESD) clip device solves an ESD current path problem experienced in the field. When the customer installs a tape cartridge in the tape drive, there is a possibility of injecting stored charge into the machine through the tape cartridge. The ESD clip device forces the discharge away from the machine and directs the current path through a series resistance, lowering the current level. Thus, the device controls both the location and level of ESD current entering the machine.

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Clip for Preventing Electrostatic Discharge Damage

The described electrostatic discharge (ESD) clip device solves an ESD current path problem experienced in the field. When the customer installs a tape cartridge in the tape drive, there is a possibility of injecting stored charge into the machine through the tape cartridge. The ESD clip device forces the discharge away from the machine and directs the current path through a series resistance, lowering the current level. Thus, the device controls both the location and level of ESD current entering the machine.

An ESD clip 10, shown in Fig. 1, alters the channel or current path by placing a series resistance in the path and providing a known fixed path. The resistance used is a conductive plastic material. The volume resistance is approximately 200 to 400 ohm-cm. This resistance is low enough to guarantee that the current path taken is through ESD clip 10 and not arc to adjacent grounded parts of the tape drive. The resistance is also high enough to limit the current, allowing a voltage level of approximately 20,000 volts to discharge to the tape unit without experiencing a problem. This is an increase from the failure level of 7,000 volts without ESD clip 10. When a discharge occurs to the device, the arc occurs outside the machine, helping to eliminate the broadband radiation that accompanies a space discharge. ESD clip 10 extends to the front edge of the tape tray on the tape drive, providing the furthest discha...