Detection by a scanner of radiation from the scanner reflected from a bar code
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United States of America Patent
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-
Feb 11, 1997
Grant Date -
N/A
app pub date -
Jul 20, 1995
filing date -
Mar 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method for the detection of imprint markings (6) made into an object, especially for reading a bar code, the markings (6, 6a) of which are formed into a second level (8) which differs from the surface level (4) of the object, the second level (8) being arranged to reflect a radiation (5) to at least some extent. The method utilizes apparatus which transmit (1) and receive (2) a radiation, the apparatus being separated from each other by a separating wall (3) which is arranged transversely with respect to the surface plane of the object and near the surface (4), the wall preventing radiation from passing from the transmitting (1) to the receiving apparatus (2) at such locations where the surface (4), which is at a higher lever, extends to an edge (7) of the separating wall (3). The invention also relates to a reader head device for reading imprint markings (6) made into the surface of an object, wherein an edge (7) of a separating wall (3) extends beyond the transmitting and/or receiving apparatus (1, 2) essentially to the higher located surface (4) of the object. The invention further relates to the use of the method and device for reading a bar code.
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