System for detecting the presence of an electrically conductive

Details System for detecting the presence of an electrically conductive System for detecting the presence of an electrically conductive

1996-12-16

1999-06-15

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 340510, 340511, 307 11, G08B 2300

Patent

active

059126183

ABSTRACT:
The invention provides a system for detecting the presence of an electrically conductive object, the system comprising a first and a second contact (C1 and C2) intended to be short-circuited by said object, and further comprising a control device for the electric potentials of the contacts. In accordance with the invention the control device comprises means for applying a given potential (Vref), referred to as the reference potential, to the second contact (C2) at a high impedance (Z) with respect to the resistance generated by the contact with the conductive object to be detected, and for supplying a signal (CP) indicating that the potential of the second contact (C2) is near the reference potential (Vref).

REFERENCES:
patent: 4879476 (1989-11-01), Schweizer
patent: 5210525 (1993-05-01), Lennon et al.
IBM Technical Disclosure Bulletin vol. 22, No. 10, Mar. 1980, pp. 4615-4616 .

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