Matrix switch apparatus including pull-up resistors for sense li

Details Matrix switch apparatus including pull-up resistors for sense li Matrix switch apparatus including pull-up resistors for sense li

1984-05-24

1986-08-19

Weldon, Ulysses

Communications: electrical

Audible indication

Percussion-type sound producer

34082579, H04L 100

Patent

active

046072519

ABSTRACT:
A system is provided for detecting closed contacts in a matrix switch made by using, for example, transparent conductive sheets. According to the present invention, switching elements are parallel-connected to resistors which are used to pull up the electric potentials of sense lines. These switching elements are suitably turned on to expedite the electric potentials of the sense lines. This enables the detection of closed contacts to be done correctly even when an operational speed is increased.

REFERENCES:
patent: 3816770 (1974-06-01), Nakamura
patent: 3990070 (1976-11-01), Spence
patent: 4075621 (1978-02-01), Salmon
patent: 4234872 (1980-11-01), Halder
patent: 4318087 (1982-03-01), Wilson

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