Diffuse light collector which minimizes streak artifacts
US5184013A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1991 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Jul 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/0281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser film scanner scans film as it is translated in a substantially horizonally plane past a diffuse light collector. The light collector includes an elongated housing enclosing a collection cavity having a slot at its top through which light enters. The cavity has diffuse reflective surfaces to diffusely reflect light to a photodetector communicating with the cavity. Positioned opposite the slot is a slanted face from which light entering the cavity is directly reflected. The slanted face avoids streak artifacts in a detected image by permitting dirt particles falling through the slot to roll down to a lower region in the cavity. The slaned face may be formed from a removable insert of low adhesion fluorocarbon material to permit cleaning without disassembling the collector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.