Browse Prior Art Database

Hall Effect Keyboard Including Magnetic Keeper

IP.com Disclosure Number: IPCOM000076477D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Ludeman, CP: AUTHOR

Abstract

An elastomer sheet permanent magnetic material or magnetic keeper serves as both a keyboard face and element, to activate Hall devices or magnetic field sensitive devices in a keyboard. The keeper provides a low-cost numeric or alphanumeric keyboard face for use in many terminals.

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Hall Effect Keyboard Including Magnetic Keeper

An elastomer sheet permanent magnetic material or magnetic keeper serves as both a keyboard face and element, to activate Hall devices or magnetic field sensitive devices in a keyboard. The keeper provides a low-cost numeric or alphanumeric keyboard face for use in many terminals.

In Fig. 1, an elastomer sheet permanent magnet or keeper 10 includes indicia 20, corresponding to the various characters in a typewriter or terminal keyboard. An insulating or nonmagnetic grid spacer 22 is disposed between the keeper 10 and a printed circuit board 24. The board includes a plurality of Hall effect, or magnetic field sensitive devices 26 interconnected in a circuit pattern that provides a unique output for each indicia. The devices 26 provide amplification and decoding for generating the unique output signals.

The members 10, 22 and 24 are suitably packaged in an arrangement which permits operation, as shown in Fig. 2. Manually depressing an indicia in the keeper, actuates the related Hall effect device to provide a unique output signal suitable for operating a related electro-mechanical or transmission apparatus.

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