Hand-Held Holographic Scanner Having Highly Visible Locator Beam
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
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.