Optical code reader wherein guide light source is turned on before turn-on of an illumination light source and is turned off after turn-on of the illumination light source
US5992746A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Feb 18, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical code reader includes a reading window, a reading control circuit for sensing an image of a 2-dimensional code via the reading window in a state where the reading window is set within a preset distance from the 2-dimensional code and converting the sensed image into image data, a guide light source for applying a guide light beam to permit the 2-dimensional code to be guided within the reading range of the reading control circuit, and a portable frame having an opening used as the reading window, for accommodating the reading control circuit and guide light source. In the optical code reader, the guide light beam indicates the center of the reading range and is applied from the guide light source except for a period during which the image of the 2-dimensional code is sensed by the reading control circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.