Illumination system for a photographic copying apparatus
US4132478A · kind A · utility
2Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1977 |
| Grant date | Jan 2, 1979 |
| Priority date | — |
| Expiry date | Jul 6, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/545
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-diffuser for a photographic copier such as an enlarger incorporates a closely contacting parallel row of elongated glass rods held between a pair of tracks. The rods are preferably of heat-resistant glass of round cross section. An additional row of such rods may be disposed parallel to the first row and staggered therefrom to improve the diffusion of a beam of light passing through them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.