Method and apparatus for the detection of the location of multiple character marks
US5691533A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2557/33
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
This invention pertains to a detection system for locating and counting identification marks attached to a written or printed item. A signal processing method and apparatus is described which allows detection of multiple character marks as a single event in continually moving linear materials. The marks are passed between the path of a detection zone comprising a light source and a photodetector to precipitate a voltage drop and feeding that drop to a circuit that recognizes the drop and simultaneously triggers a time window during which changes in voltage are ignored, which time window is no longer than the time it takes for a full mark to pass under the zone and shorter than the time it takes for the leading edge of the next multicharacter marks to reach the detection zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.