Reading method and apparatus for a three-dimensional information carrier
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United States of America Patent
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Jan 31, 2006
Grant Date -
N/A
app pub date -
Aug 26, 1998
filing date -
Aug 26, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for reading in a three-dimensional information carrier are presented. The three-dimensional information carrier is formed with a plurality of spaced-apart data regions, each surrounded by surrounding-regions. The data regions are made of a material capable of generating an output excited radiation, when interacting with a predetermined incident exciting radiation, while the surrounding regions are substantially optically transparent. The apparatus comprises an illumination unit, a light directing unit and a detector unit. The illumination unit produces a scanning beam of the incident radiation. The light directing unit projects the incident radiation onto a scan region located in an addressed plane inside the carrier and collects the output radiation. The light directing unit is capable of picking up a predetermined portion of the collected output radiation, so as to provide spatial separation of the output radiation components produced by the data regions located in the addressed plane and the output radiation components produced by the data regions located at any other location inside the carrier.
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