Photographic copying apparatus with master format adjustment
US4754307A · kind A · utility
4Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Jun 22, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/545
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In the exposure beam path of a copy master which may have various formats, a four element variable objective is provided with stationary rear and front elements and variable intermediate elements. The rear element is arranged in a carousel-like automatic changer and may be replaced together with a master masks. A control device performs, by means of step motors and spindles, the automatic adjustment of the intermediate elements of the variable objective as a function of a particular master format set, in a manner such that the area of the copy master exposed to the copying light is automatically adapted to the master format.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.