Browse Prior Art Database

Indicator Connections on Membrane Key Pad

IP.com Disclosure Number: IPCOM000049598D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Pan, RF: AUTHOR [+2]

Abstract

Light indicators are connected directly to the thin flexible sheets which form a membrane key pad, thereby eliminating the need for special connectors.

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Indicator Connections on Membrane Key Pad

Light indicators are connected directly to the thin flexible sheets which form a membrane key pad, thereby eliminating the need for special connectors.

Membrane key pads are formed by printing circuit patterns on a thin flexible plastic member. Two such circuit patterns are generally separated by a spacer, and when the two patterns are pressed into contact by a keybutton actuator or the like, a signal is generated indicating key depression. Such a keyboard is disclosed in the IBM Technical Disclosure Bulletin 11, 1569 (April 1969). An indicator connection can be made on the same plastic member by producing an extension 11 thereof. The extension is folded along the lines 13a, 13b and 13c so as to form a cavity to receive the indicator lamp module 15, as depicted in Fig.
3. Elastic material 17 squeezes the extension 11 against the lamp module 15 to insure intimate circuit contact. The indicator lamps 19 thus may be placed in close proximity to the keys (not shown) on the keyboard.

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