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Physical and Electrostatic Discharge Protection Package

IP.com Disclosure Number: IPCOM000041521D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 3 page(s) / 107K

Publishing Venue

IBM

Related People

Alexander, AD: AUTHOR [+6]

Abstract

It is necessary to prevent physical and electrical damage to electronic circuit cards and like assemblies which could occur during shipment and handling thereof. The present reusable container not only protects the circuit cards against physical and electrical damage, it provides a portable electrical ground work station for maintenance operations. The circuit cards (not shown) mount electrostatic sensitive electronic components. Electrostatic discharge (ESD) causes damage to the electronic components by producing excessive current flow in them. This current flow can result from direct discharge to an electronic component or module, triboelectric charges created by contact with dissimilar materials, large potential difference across the component or module or a transient electric field.

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Physical and Electrostatic Discharge Protection Package

It is necessary to prevent physical and electrical damage to electronic circuit cards and like assemblies which could occur during shipment and handling thereof. The present reusable container not only protects the circuit cards against physical and electrical damage, it provides a portable electrical ground work station for maintenance operations. The circuit cards (not shown) mount electrostatic sensitive electronic components. Electrostatic discharge (ESD) causes damage to the electronic components by producing excessive current flow in them. This current flow can result from direct discharge to an electronic component or module, triboelectric charges created by contact with dissimilar materials, large potential difference across the component or module or a transient electric field. The present container is constructed to prevent this damaging current flow. The present container electrically isolates the electrostatic sensitive electronic components from the ESD source by functioning as a Faraday cage. The present container 10 is made from conductive plastic and can be formed by injection or blow molding as in Figs. 1 and 2, respectively. Both triboelectric and field-effect protection are provided. The conductive outside surface provides a conductive path and can conduct a charge from the person or equipment handling the container through the container and then through a connecting ground strap (not shown), via a secure ground strap connection 20 to the equipment ground. The interior of the container is fitted with antistatic foam pads 15 for internal cushioning and for providing an antistatic interface for protection while neutralization of the container occurs. The container 10 is provided with a transparent conductive window 25 made from plastic with a metallized surface where one side or both are thin enough to provide transparency while maintaining electrical conductivity. The surface resistivity of the transparent window is less than 105 ohms per square. Alternatively, the window can be a laminate-type structure with a conductive film and antistatic body. Antistatic transparent wear-resistant coatings can be coupled or overla...