Apparatus for reading a bar code
US5128527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Mar 29, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06056
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A second bar code such as an add-on code which comprises only a character bar and is added to the side of the first bar code such as UPC, EAN and JAN which has a center bar and guard bar can be correctly read out. When the scanning is made from the first bar code side to the second bar code side, a write address produced when the right guard bar of the first bar code is recognized is used to access the data of the second bar code. Conversely, where the scanning is made from the second bar code side to the first bar code side, the write address produced when the center bar of the first bar code is recognized is used to access the second bar code after an arithmetic operation. Therefore, the first bar code can be clearly distinguished from the second bar code which is different in bar code system and the second bar code can be correctly read out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.