Laser beam scan type barcode reader and program recording mediums
US6419155B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1999 |
| Grant date | Jul 16, 2002 |
| Priority date | — |
| Expiry date | Oct 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10584
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A laser beam scan type barcode reader which reads a pair of spaced marks which adjusts or specify corrects start and stop positions of the laser beam irradiation. The distance between the pair of marks corresponds to a length of a barcode to be read. The reader detects the start and stop positions of the laser beam irradiation determined by the pair of marks, and sets the detected start and stop positions of the laser beam irradiation. When the reader reads the barcode, it controls the turning on/off of the laser beam in one scan period based on the set start and stop positions of the laser beam irradiation, and determines the actual scan span in which the laser beam is turned on in the one scan period based on the start and stop positions determined by the pair of marks, which ensures preventing structural, functional and characteristic deviations of the reader from the standards from influencing the scan span of the laser beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.