Optical transparency detection and discrimination in an electronic reprographic printing system
US5329338A · kind A · utility
13Cited by
5References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1991 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/1712
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting and discriminating a copy sheet in an electronic reprographic printing system has a diffuse reflective sensor disposed adjacent a portion of the path over which the copy sheet moves. The sensor is disposed so that its optical axis intersects the copy sheet where the angle of intersection between the copy sheet and the optical axis remains within a specified range of angles for the maximum length of the copy sheet. A diffuse reflective sensor is also disposed adjacent inlet baffles with its optical axis aligned so that a transparent copy sheet is not detected while an opaque copy sheet is.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.