Browse Prior Art Database

Contaminant Entrapment Configured Capacitance Actuator

IP.com Disclosure Number: IPCOM000050679D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Bellamy, RL: AUTHOR

Abstract

The three froms of contaminants (assembly, wear and airborne) generally enter through the tip of the chimney and settle on the top surface 10 of the actuator 16, as described in U.S. Patent 4,118,611. Heretofore, the minute particles have easily descended downwardly through the openings 14 on either side of the buckling spring post 11. These contamination particles then migrate to the underneath side of the actuator 12 which will increase the air gap, reduce the capacitance between the actuator and pad card and may cause failure.

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Contaminant Entrapment Configured Capacitance Actuator

The three froms of contaminants (assembly, wear and airborne) generally enter through the tip of the chimney and settle on the top surface 10 of the actuator 16, as described in U.S. Patent 4,118,611. Heretofore, the minute particles have easily descended downwardly through the openings 14 on either side of the buckling spring post 11. These contamination particles then migrate to the underneath side of the actuator 12 which will increase the air gap, reduce the capacitance between the actuator and pad card and may cause failure.

Due to the functional requirements and space constraints, the passage of particles downwardly through the chimney 13 is inevitable. However, utilization of a contaminant corral 15 will collect most of the particles on top of the actuator 16 where their presence is not detrimental to function. The modification may be implemented by a modification to the actuator only and not require extensive changes to other portions of the keyboard structure.

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