Light integrator for film scanning with enhanced suppression of artifacts due to scratches and debris
US6710329B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Sep 12, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light integrator produces diffuse illumination from a beam of light wherein image artifacts due to debris within the integrator are suppressed. The light integrator includes an integrator block having an elongated cylindrical light integrating cavity enclosed by end walls and a longitudinal cylindrical chamber wall having a diffusely reflecting interior surface The chamber wall includes a longitudinally extending output slit for emitting light from the cavity. A dust-free zone exists within the cavity in the shape of a sector of a circle within which contaminants cannot come to rest without producing visible artifacts, wherein the origin of the sector is located at or nearby a plane of the original. An elongated light pipe extends into the cavity through one of the end walls, where the light pipe has an input port at one end thereof for introducing the beam of light and a treatment along its length for emitting light entering its port into the cavity. At least one of the end walls forms a support for the elongated light pipe so that the light pipe extends along a length of the integrating cavity outside of the dust-free zone and in relation to the chamber wall thereof to direct l…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.