Key input apparatus

Details Key input apparatus Key input apparatus

1988-02-22

1990-04-17

Malzahn, David H.

Boots, shoes, and leggings

341 22, G06F 3023

Patent

active

049186345

ABSTRACT:
This invention relates to a key input apparatus used for inputting the information into various electronic equipments, such as a computer or a computer applied equipment, and the key input apparatus according to this invention has a variable resistance circuit which comprises a plurality of key switches and a plurality of resistance elements connected thereto and changes the resistance value thereof corresponding to the depressed key switch. The apparatus can generate analog voltage corresponding to the change in the resistance value and convert the analog voltage into a digital signal to thereby discriminate the depressed key switch on the basis of the output of the digital signal, whereby the number of signal conductors or terminals between the keyboard and the equipment to be inputted with information is reduced.

REFERENCES:
patent: 3940758 (1976-02-01), Margolin
patent: 4015254 (1977-03-01), Strandt
patent: 4583189 (1986-04-01), Koyama

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