Electro-optical sensor for marks on a sheet
US5635726A · kind A · utility
37Cited by
3References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Oct 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C13/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electro-optical sensor senses marks on a sheet which travels longitudinally with respect to a printed circuit board, carrying linear arrays of light sources (LEDs) and photodetectors and optics which define zones displaced laterally across the width of a sheet of paper, longitudinal columns of which can contain marks, the presence and absence of which marks is detected by the sensor. The sensor is especially adapted for use in detecting marks which indicate votes on paper ballots in electronic, computerized vote counting apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.