Light source for film scanner
US6046826A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1997 |
| Grant date | Apr 4, 2000 |
| Priority date | — |
| Expiry date | Aug 25, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/0289
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light source for scanning a transparent film is equipped with a light intensity adjustment plate inserted between a light reflector and a light slot. The light intensity adjustment plate is partially painted to absorb light, so that the stronger light from the parallel center section of a linear light is weakened to produce a more uniform light along the whole scanning length. The light intensity adjustment plate can be placed between the U-shaped light tube, or attached to the inner wall of the U-shaped light tube housing. The light intensity adjustment plate can have a frame which is rectangular or concave. The light intensity adjustment plate can also have an shaped extension toward the light tube to produce more uniform light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.