Instantaneous exposure control for film
US4161363A · kind A · utility
13Cited by
3References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1975 |
| Grant date | Jul 17, 1979 |
| Priority date | — |
| Expiry date | Aug 4, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The exposure of film which changes its transmissivity as a function of the quantum of light to which it is subjected is controlled by sensing the intensity of the light transmitted through the film. From the sensed light the change in the light transmissivity of the film is determined and when that change has reached the desired level the exposure of the film is terminated. The exposure is instantaneously controlled and terminated only after the desired exposure level has been reached irrespective of the time required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.