Optical illumination device for use in copying machine
US3947115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1974 |
| Grant date | Mar 30, 1976 |
| Priority date | — |
| Expiry date | Jul 22, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/0287
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical illumination device for use in a copying machine, which illuminates the original to be copied, with a ribbon of light. The optical illumination device comprises a pair of reflectors respectively having concave, reflective surfaces which comprise individual portions of hollow right elliptical cylinders of different ellipticity. Each of these first and second elliptical cylinders has a pair of line foci and the first and second reflectors are arranged such that one of the line foci of the first elliptical cylinder is substantially in alignment with one of the line foci of the second elliptical cylinder. A line light source is disposed in alignment with the other focus of the first elliptical cylinder while the other focus of the second elliptical cylinder is situated in the vicinity or at a position where the original to be copied is placed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.