Browse Prior Art Database

Hand-Held Holographic Scanner Having Highly Visible Locator Beam

IP.com Disclosure Number: IPCOM000043534D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Cato, RT: AUTHOR

Abstract

In certain applications, such as warehousing or inventory control, a hand-held scanner gun might be used to scan bar code labels up to a foot away from the nose of the scanner. For reasons of cost and portability, it would be desirable to use a semiconductor laser as the source of the infrared scan beam. However, the human eye is not sensitive to radiation in the infrared range, making it difficult for an operator to determine whether the scan beam is actually crossing a distant label. To provide guidance to the operator, a second incandescent light source is included in the hand-held scanner. The light produced by this incandescent light source would be filtered by a blue or green filter to provide a highly visible output beam.

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Hand-Held Holographic Scanner Having Highly Visible Locator Beam

In certain applications, such as warehousing or inventory control, a hand-held scanner gun might be used to scan bar code labels up to a foot away from the nose of the scanner. For reasons of cost and portability, it would be desirable to use a semiconductor laser as the source of the infrared scan beam. However, the human eye is not sensitive to radiation in the infrared range, making it difficult for an operator to determine whether the scan beam is actually crossing a distant label. To provide guidance to the operator, a second incandescent light source is included in the hand-held scanner. The light produced by this incandescent light source would be filtered by a blue or green filter to provide a highly visible output beam. Referring to the drawing, a semiconductor laser 10 would provide an infrared scan beam 12 which would be redirected by an offset holographic lens
14. An incandescent light source 16 would produce an output beam which might be focussed by a lens 18 and filtered by a blue or green filter 20 to provide a larger locator beam 22. The locator beam 22 would be coaxial with the infrared scan beam produced by laser 10. In a retroreflective system, light reflected from a label would be redirected by hologram 14 towards a photodetector 24 shielded by an infrared filter 26. Any blue or green component of the returning light signal would be removed by filter 26 so that photodetector 24 w...