Bar code scanner with quasi-retroreflective light collection
US5530233A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1994 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1092
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Optical scanning of bar code symbols in which light reflected from the scanned symbol is collected with stationary light collection optics and swept across an array of individual light detection elements (e.g., photodetectors). Detection circuitry determines which of the detection elements is receiving the incoming light beam at a given time, and produces an output signal based preferably only on the outputs of those detection elements. The selection of detection elements to be used in forming the output signal may be made by synchronizing the sampling of the detection elements with the scanning movement of the outgoing light beam. Alternatively, the selection may be based on the output level of the detection elements (e.g., by only using outputs that exceed a predetermined threshold).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.