Replaceable emission-condensing unit for a bar code reader
US6142378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1098
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A bar-code reader is easy to use and has an optical system that is easy to position and replace. The bar-code reader is used for a POS system. The bar code reader has a laser source for emitting a laser beam, a scan unit for scanning a bar code with the laser beam according to a predetermined scanning pattern, a window for emitting the laser beam from the scan unit, a condensing unit for condensing reflected light returned from the bar code through the window and scan unit along the route the laser beam traced, a photosensor for detecting the condensed light and providing an electric signal in proportion to the intensity of the detected light, and an emission-condensing unit incorporating the laser source, condensing unit, and photosensor, which can be easily and correctly mechanically installed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.