System for detecting the presence of an electrically conductive object, particularly an integrated circuit on a chip card
US5912618A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1996 |
| Grant date | Jun 15, 1999 |
| Priority date | — |
| Expiry date | Dec 16, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0013
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.