Multi-area brightness measuring apparatus
US5021818A · kind A · utility
18Cited by
6References
44Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1989 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Jul 7, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/09972
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multi-area brightness measuring apparatus for a camera, which measures the brightness of an object in a center area of a photographing area and a circumferential area surrounding the center area to detect whether the object in the center area is in follow light state or in back light state in order to correct the exposure value. The exposure also can be controlled in accordance with the magnification, i.e. in accordance with the surface area of a main object occupying the center area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.