Browse Prior Art Database

Multifunction Hall Switch

IP.com Disclosure Number: IPCOM000078923D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Kilmoyer, RD: AUTHOR [+2]

Abstract

A magneto-responsive element, e.g., a plurality of Hall devices, may be fabricated with appropriate amplifiers in an integrated circuit and adapted to be responsive in a multiple switch. Each position of the switch initiates a unique output from the magneto-responsive element. The multifunction switch enables the number of active devices or magneto-responsive elements to be reduced in generating a large number of unique signals, as for example in a keyboard.

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Multifunction Hall Switch

A magneto-responsive element, e.g., a plurality of Hall devices, may be fabricated with appropriate amplifiers in an integrated circuit and adapted to be responsive in a multiple switch.

Each position of the switch initiates a unique output from the magneto-responsive element. The multifunction switch enables the number of active devices or magneto-responsive elements to be reduced in generating a large number of unique signals, as for example in a keyboard.

In one form, four Hall devices and associated amplifiers are incorporated into a single semiconductor chip 5, as shown in Fig. 1. Each device is adapted to cooperate with a magnet 1', 2', 3' and 4'. The magnets are arranged in a suitable manner, as shown in Fig. 2, in order to give each magnetic element a unique input signal. Each magnetic member is a part of a lever 1'', 2'' and so forth. Fig. 3 shows two lever operated magnets. The levers may be individually and/ or severally operated by key elements 9, 11, 13 and 15.

Operation of a key element lowers one or more levers to alter the electrical state of the associated Hall devices. For example, operation of key element 9 depresses levers 1'' and 2'', to initiate electrical signals from the Hall devices that define binary code 11. Similarly, key elements 11 and 13 operate levers 1'' and 2'', respectively, to initiate signals from the respective Hall devices that define binary codes 10 and 01, respectively. Operation of the key 15 doe...