Self calibrating media edge sensor
US7391043B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 2005 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Jan 15, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65C9/42
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Various edge detection arrangements are disclosed, including an edge detection method and arrangement that utilizes outputs of commonly illuminated reference and edge sensors as the inputs for a comparator. The reference sensor is configured to have a wide field of view and the edge sensor is configured to have a narrow, high gain, field of view. Therefore, the reference sensor has a broad signal response to an edge passage and the edge sensor a steep and narrow signal response. When the two signals are biased to cross each other, the comparator output changes state, indicating passage of an edge. Because the reference sensor provides a base signal level directly related to the real time illumination level that the edge sensor also receives, the reference sensor provides a switch point along the transition ramp of the edge sensor that integrates a majority of the random error sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.