Method and apparatus for controlling exposure by selective use of blocking visible filter
US4358186A · kind A · utility
21Cited by
43References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1979 |
| Grant date | Nov 9, 1982 |
| Priority date | — |
| Expiry date | Dec 31, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Method and apparatus for automatically controlling exposure of a photographic film by evaluating selected spectral scene light frequencies during certain ambient light portions of an exposure interval and evaluating scene light frequencies exclusive of visible frequencies during other portions of the interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.