Reading bar codes with a wide laser beam
US5369264A · kind A · utility
23Cited by
15References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 1992 |
| Grant date | Nov 29, 1994 |
| Priority date | — |
| Expiry date | Sep 25, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06028
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A height- or width-modulated bar code is decoded by scanning an oblong laser beam across the bar code. Light reflected from the bar code varies in intensity as the laser beam traverses dark and light regions of the bar code. The bar code can be decoded by locating the valleys in the variation of intensity of the reflected light, and comparing the depth of these valleys; the deepest valleys correspond to tall or wide bars and the remainder correspond to short or narrow bars.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.