Browse Prior Art Database

Large Depth of Field Scanner using a Diode Laser

IP.com Disclosure Number: IPCOM000037997D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-31

Publishing Venue

IBM

Related People

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

Abstract

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.)