Exposure control device for camera
US4572645A · kind A · utility
15Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1984 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Nov 13, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/097
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure control device for camera includes a detector for detecting the opening of a sector shutter. By detecting an actual opening of the sector shutter, an amount of incremental exposure is calculated based on the opening and the corresponding time interval. Such amount is accumulated to provide an accumulated value. An amount of proper exposure is determined on the basis of photographing information including the brightness of an object being photographed and a film speed. The sector shutter is controlled in accordance with the accumulated value and the amount of proper exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.