Optical code reader with devices to locate a code in a reading window
US5689104A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1995 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Sep 15, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10881
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical code reader is held in a hand of an operator and is brought near an article having a 2-dimensional code affixed thereto at the time of reading. The optical code reader includes a read window, a light source for illuminating an article via the read window, and a read control circuit for receiving light reflected by the article via the read window and detecting a 2-dimensional code from an image corresponding to the reflected light. The light source may include a guide beam projector for radiating guide light in a direction almost perpendicular to a read window plane, the guide light indicating a read range corresponding to the size of the read window on a plane parallel to the read window plane. Transparent cap may be provided at the read window for permitting a code on the article to be seen from the outside, while reducing external light entering the cap from the outside of the cap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.