Light source for photographic color printing
US4814828A · kind A · utility
1Cited by
11References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 1, 1988 |
| Grant date | Mar 21, 1989 |
| Priority date | — |
| Expiry date | Feb 1, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H5/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light source or lamphouse wherein light from lamps 16 of different colors, as obtained by filters 18, is projected into a full diffusing chamber 20 with diffusing reflective internal surfaces where the light is premixed. The diffusing chamber is disposed adjacent to a specular dispersing chamber 22 of greater volume than the diffusing chamber where the light is further mixed and dispersed to provide uniform illumination at an outlet; the use of both types of chambers providing efficient mixing in a limited volume so that the source can be movably mounted on the column of an enlarger or printer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.