Device for and method of producing photographs of controlled contrast
US4580167A · kind A · utility
8Cited by
4References
6Claims
0Family size
Inventor
Key dates
| Filing date | Sep 20, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Sep 20, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/725
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device for producing photographs of controlled contrast wherein a negative to be copied is evenly illuminated by a light source, the image thereof is directed by an optical member to an image detecting and conversion unit which produces a "non-sharp mask" of said negative under control of a respective control unit. Both, the "non-sharp mask" of the image and the image of the negative are directed into an image plane where they are superimposed and exposed upon a photo sensitive material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.