Device for the counting of chip cards contained in a batch
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United States of America Patent
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Nov 10, 1992
Grant Date -
N/A
app pub date -
Jul 24, 1991
filing date -
Jul 30, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to count chip cards when they are manufactured, it is chosen to present these chip cards in lots, edgewise, in the field of an X-radiation. A measurement is made of the differential image of attenuation of the X-radiation due to the passage of this X-radiation, on the one hand through the plastic card structure, which is relatively transparent to the X-radiation, and on the other hand through the metallic connection parts of the chips. In the radiological absorption image obtained, a count is made of the number of transitions of the absorption signal. It is shown that the reliability of the counting is greatly improved, as is the security of manipulation.
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