Data reader and reader system having visible centerless targeting
US6191406A · kind A · utility
139Cited by
30References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1998 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Jul 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1011
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data reader has a digital image detector an optical system imaging on the digital image detector, and a marker beam source that emits a diverging, centerless visible light projection. A data reading system includes the data reader and media bearing: a visible primary image and a secondary image overlying the visible image. The secondary image is transparent to visible radiation and modulates a band of invisible electromagnetic radiation. The media also bears visible indicia aligned with the secondary image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.