Optical and passive electromagnetic reader for reading machine-readable symbols, such as bar codes, and reading wireless tags, such as radio frequency tags, and corresponding method
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United States of America Patent
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Aug 29, 2000
Grant Date -
N/A
app pub date -
Nov 17, 1998
filing date -
Nov 17, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A document or object includes resonant tags, such as thin dipoles, and a machine-readable symbol, such as an area symbol, secured thereto. A reader reads the symbol and determines response characteristics encoded therein for the dipoles. The reader then can interrogate the dipoles and, together with the response characteristics and determined orientation (derived from the symbol), accurately determine resonant response characteristics received from the dipoles. Alternatively, a printer may interrogate the document to determine the response characteristics of the dipoles in the document, and then print the corresponding symbol.
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