Brightness measuring apparatus for providing adequate object brightness and a flashlight emission apparatus providing adequate exposure, irrespective of photographing conditions
US4984006A · kind A · utility
9Cited by
6References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1990 |
| Grant date | Jan 8, 1991 |
| Priority date | — |
| Expiry date | Apr 18, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/09979
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The brightness measuring apparatus according to this invention comprises a plurality of light receiving elements for respectively receive light from a plurality of areas in a photographic range and output values corresponding to the areas based on the amounts of light received, and judges whether or not the object is under rear light conditions based on the outputted values and the value of rear light detection level which is decided based on focal length of a photographing lens, image magnification, object distance, or brightness of background.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.