Full frame flash illumination system utilizing a diffuse integrating optical cavity
US4250538A · kind A · utility
10Cited by
1References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1979 |
| Grant date | Feb 10, 1981 |
| Priority date | — |
| Expiry date | Feb 26, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2013/05
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illumination system for a document copying machine including an optical cavity having interior walls coated with a white, diffusely reflecting material. One end of the cavity contains a platen for positioning document to be copied while the opposing end contains a lens for forming an image of the document on a light sensitive image plane. Illumination from a single flash illumination source located within the cavity, undergoes multiple reflections from the walls resulting in a uniform diffuse illumination of the document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.