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Programming Elastic Diaphragm Switching Matrix by Small Balls

IP.com Disclosure Number: IPCOM000091669D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Brooks, EG: AUTHOR [+3]

Abstract

Elastic diaphragm contacts in a matrix are selectively actuated by positioning small balls in a two-dimensional array of holes. The balls do not provide electrical contact but are merely actuators to press the contacts of elastic diaphragm switches together. In drawing 1, a cross-section of one switch is shown with ball 24 to actuate it. The switch has a rigid substrate 10 which has embedded in it electrical paths and contacts 12. The upper contact of the switch is conductive material 14 which is carried on elastic layer 16. The latter and rigid substrate 10 are separated by insulator 18. Positioned above the contact 14 is plastic layer 20 containing holes 22. Ball 24 is placed in hole 22 and is pressed down by closing lid 26 onto layer 20. Lid 26 bears a rubber layer 28 to provide a spring force pushing ball 24 down.

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Programming Elastic Diaphragm Switching Matrix by Small Balls

Elastic diaphragm contacts in a matrix are selectively actuated by positioning small balls in a two-dimensional array of holes. The balls do not provide electrical contact but are merely actuators to press the contacts of elastic diaphragm switches together. In drawing 1, a cross-section of one switch is shown with ball 24 to actuate it. The switch has a rigid substrate 10 which has embedded in it electrical paths and contacts 12. The upper contact of the switch is conductive material 14 which is carried on elastic layer 16. The latter and rigid substrate 10 are separated by insulator 18. Positioned above the contact 14 is plastic layer 20 containing holes 22. Ball 24 is placed in hole 22 and is pressed down by closing lid 26 onto layer 20. Lid 26 bears a rubber layer 28 to provide a spring force pushing ball 24 down. Lid 26 is attached by hinge 30 to chassis 32 which holds the entire matrix assembly.

When lid 26 is pressed down onto layer 20, layer 28 spring loads ball 24 down. The force of ball 24 pressing down stretches layer 16 and pushes contact 14 down onto conductor 12 embedded in substrate 10. If no ball is present in a hole 22, contact 14 is not pressed into contact with conductor 12.

In drawing 2, a matrix of elastic switches is shown. The contacts to be closed are selected by placing balls 24 in holes 22. Lower contacts 12 are arranged so that all contacts in a column are interconnected. Upp...