Circuit arrangement for adjusting the triggering point of an ind

Details Circuit arrangement for adjusting the triggering point of an ind Circuit arrangement for adjusting the triggering point of an ind

1989-10-24

1991-11-19

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 24, 341 26, 4004792, H03M 1100, G06F 302

Patent

active

050669516

ABSTRACT:
The present invention is directed to a circuit arrangement for adjustment of the triggering point of the keys in an inductive keyboard. The keyboard consists essentially of a printed circuit board designed in a matrix-like manner, comprising coils superimposed upon each other, into which a ferrite pin plunges when a key is actuated. By the cooperation of a pulse generator with a current switch which can be influenced through control lines, said cooperation being controllable by a microcomputer, a current pulse is coupled from one coil to another coil and is recognized as a readout signal by a controllable readout amplifier and is conducted further to a central unit. The adjustment of the triggering point of the keys is accomplished by varying the steepness of the driving current pulse, for example, by means of a blocking time duration in the charging of a capacitor determined only once, which durations are stored in a table of values, or it is derived from the fundamental interlinked signals of the keys.

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patent: 4494109 (1985-01-01), Bernin
patent: 4529967 (1985-07-01), Gizzt

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