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Matrix Keyboard with Hydraulic Reset and Fluorescent Character Indication

IP.com Disclosure Number: IPCOM000092572D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Thorne, WD: AUTHOR

Abstract

The matrix keyboard provides for a 1-out-of-n character selection per column and a plurality of columns, similar to a comptometer keyboard. Each column has a hydraulic fluid reset in combination with a fluorescent indication for actuated keys. Each key position comprises push button 10 of transparent material, snapper element 11 which normally biases button 10 in its unactuated position, fluid channel 12, sensor element 13 having an upper surface of fluorescent material, support member 14, insulator element 15, flexible circuit pattern 16, spacer 17, and circuit board 18.

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Matrix Keyboard with Hydraulic Reset and Fluorescent Character Indication

The matrix keyboard provides for a 1-out-of-n character selection per column and a plurality of columns, similar to a comptometer keyboard. Each column has a hydraulic fluid reset in combination with a fluorescent indication for actuated keys. Each key position comprises push button 10 of transparent material, snapper element 11 which normally biases button 10 in its unactuated position, fluid channel 12, sensor element 13 having an upper surface of fluorescent material, support member 14, insulator element 15, flexible circuit pattern 16, spacer 17, and circuit board 18.

When button 10 is actuated or depressed, element 11 is urged downward and into contact with element 13. The lower surface of button 10 is in the proximity of sensor 13. Thus the ambient light in combination with the fluorescent material on the upper surface of sensor 13 provides visual indication that button 10 is in an actuated position. The downward pressure exerted by element 13 forces pattern 16 into contact with board 18, thus completing an electrical circuit representative of the actuated key.

Each column of keys is interconnected with fluid with a single key in actuated position and in such a manner that, when another key is depressed, the fluid is moved so as to reset the previously actuated push button. Consequently, in any given column of keys only one push button can be in an actuated position at any given insta...