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Large Depth of Field Scanner using a Diode Laser Disclosure Number: IPCOM000037997D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31

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Dickson, LD Fortenberry, RS Kinney, MJ [+details]


Currently available large-depth-of-field holographic bar code scanners read bar code systems located from 250 to 1100 mm from the scanner. To account for the differences in return signal strength, the far-focus holographic facets have a larger light collection area than the near-focus facets. (For example, a facet reading at 900 mm from the scanner is designated with 9 times the collection area of a facet reading at 300 mm.)