Optical sensor for monitoring motion of a blank sheet
US7437120B2 · kind B2 · utility
4Cited by
15References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2005 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Dec 10, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00746
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus monitors the motion of sheet, such as in a digital printer. An optical sensor is capable of recording an image in a two-dimensional array of pixels, and has acuity to recognize a terrain of a small area on a sheet that is substantially blank to a human eye. The optical sensor views a portion of a sheet moving in a process direction through a path. A detection system compares at least two recorded terrain images from the sheet, thereby directly measuring velocity and direction of the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.