Precision center guiding of a web coated with light sensitive photographic emulsion
US5679161A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 1995 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Dec 8, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/09
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for detecting the edge of a light sensitive photographic emulsion on a support is described. The method and apparatus include a pair of collimated infrared light sources for illuminating each edge of the support at an angle of incidence of greater than 0.degree. to about 45.degree.. Positioned above the edges of the support are a pair of CCD cameras. Light scattered by the support and emulsion is detected by the CCD cameras and the edges of the emulsion and the edges of the support are detectable. Signal means are used to generate a signal corresponding to the position of the emulsion on the support. A conventional guider receives the signal and positions the support accordingly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.