Method and apparatus for adjusting associated photographic copying and developing machines
US4335956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1980 |
| Grant date | Jun 22, 1982 |
| Priority date | — |
| Expiry date | Mar 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/72
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The condition of a photographic copying and associated developing machine for prints of color photographic negatives is evaluated by exposing a calibrating sample onto a first portion and by making a test exposure with preselected exposure data onto a second portion of photographic paper in the copying machine. The two portions of photographic paper are then developed in the developing machine, and the thus obtained developed prints are monitored in the copying machine by comparing their densities in various colors with preselected reference densities. The results of comparison are indicative whether the machines operate satisfactorily, whether the copying machine requires one or more adjustments, or whether the developing machine is in need of at least one adjustment. The adjustment or adjustments can be effected automatically or upon examination of the results of comparison by an attendant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.