Bar code reader
US4276470A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 1979 |
| Grant date | Jun 30, 1981 |
| Priority date | — |
| Expiry date | May 21, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06028
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A single sensor system reads a traveling bar code comprising a plurality of marks separated by spaces. Each of the marks may have either of two durations and each of the spaces has a uniform duration. The bar codes are transported, relative to the sensor, at any of many different speeds so that the signals generated by the sensor may have unpredictable durations. The inventive reader determines the speed at which the bar code is being transported and interprets the signals generated by the bar code marks according to the determined speed. As used herein, the reference to "any of many different speeds" recognizes that different bar code transport devices, owing to their own inherent characteristics, may operate at different speeds although the speed for any given code transport device will tend to be fairly uniform. In some embodiments, the invention accommodates speed fluctuations in the operation of a single transport device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.