Linear light source/collector with integrating cylinder and light pipe means
US5274228A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/02885
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved linear light source or light collector for a film scanner comprising an elongated, cylindrical light integrating cylinder enclosed by first and second end walls and a longitudinal, cylindrical side wall, all having a diffusely-reflecting interior surface, the longitudinal side wall having a longitudinally extending outlet/inlet slit therein and an elongated light pipe, e.g. a glass rod, having a port at one end thereof for emitting light entering its input port (when used as a source) or for collecting light entering the slit (when used as a collector) in a preferred intensity profile varying along its length. The glass rod is mounted inside and parallel to the side wall of the cavity to direct light emitted laterally therefrom toward or to collect light reflected from the diffusely-reflecting interior surfaces. When used as a light source, a lens system directs the light from the light source into the end port of the glass rod. When used as a light collector, the light emitted from the end port is detected by a photodetector. The proferred intensity profile may be effected by a surface treatment of the glass rod comprises a coating of reflective paint applied in a leng…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.