Photographic printer with automatic sensor calibration
US4286868A · kind A · utility
18Cited by
7References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1979 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Oct 29, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/80
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic printer includes light sensors for measuring optical characteristics of photographic film to be printed. Prior to printing, the output signals of the light sensors are monitored under one or more reference condition, and calibration values based upon this monitoring are derived and stored. During normal operation of the photographic printer the sensors provide measurements of the optical characteristics of the film, and the output signals of the light sensors are calibrated based upon the stored calibration values. The exposures are then controlled as a function of the corrected output signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.