Bar code symbol scanning system having multiple scanning stations for producing a 3-D scanning volume free of substantially and temporally coincident scanning planes
First Claim
1. A bar code symbol scanning system for producing a 3-D scanning volume substantially free of spatially and temporally coincident scanning planes, said bar code scanning system comprising:
- a housing;
a plurality of light sources disposed within said housing, for producing a plurality of light beams;
light beam scanning disc disposed within said housing, rotating about an axis of rotation, and having a plurality of holographic optical elements for scanning said plurality of light beams and producing within a 3-D scanning volume, a plurality of scanning planes for scanning a code symbol;
a plurality of photodetectors disposed within said housing, each said photodetector being associated with one said light source and being capable of detecting light reflected off a code symbol scanned by the light beam produced by said associated light source; and
wherein substantially none of said scanning planes within said 3-D scanning volume are spatially and temporally coincident with any other scanning plane in order to ensure that there is substantially zero cross-talk at said plurality of photodetectors.
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Accused Products
Abstract
A holographic laser scanner of ultra-compact design capable of reading bar and other types of graphical indicia within a large scanning volume using holographic optical elements and visible laser diodes. The holographic optical elements are arranged on the scanning disc in such a manner so that none of the laser scanning planes generated within the 3-D scanning volume of the system are spatially and temporally coincident with any other laser scanning plane within the 3-D scanning volume. This novel feature of the present invention ensures that there is substantially zero cross-talk at the plurality of photodetectors provided within the system, significantly improving the performance of the system.
54 Citations
11 Claims
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1. A bar code symbol scanning system for producing a 3-D scanning volume substantially free of spatially and temporally coincident scanning planes, said bar code scanning system comprising:
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a housing; a plurality of light sources disposed within said housing, for producing a plurality of light beams; light beam scanning disc disposed within said housing, rotating about an axis of rotation, and having a plurality of holographic optical elements for scanning said plurality of light beams and producing within a 3-D scanning volume, a plurality of scanning planes for scanning a code symbol; a plurality of photodetectors disposed within said housing, each said photodetector being associated with one said light source and being capable of detecting light reflected off a code symbol scanned by the light beam produced by said associated light source; and wherein substantially none of said scanning planes within said 3-D scanning volume are spatially and temporally coincident with any other scanning plane in order to ensure that there is substantially zero cross-talk at said plurality of photodetectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification