Exposure factor setting device for a camera
US4121231A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1977 |
| Grant date | Oct 17, 1978 |
| Priority date | — |
| Expiry date | Feb 23, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/087
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure factor setting device for a photographic camera comprising manually adjustable shutter speed and diaphragm aperture setting components, an indicator cooperative with a shutter speed scale and capable of responding to either of the outputs of the shutter speed setting component and an exposure value computer, and first and second gates connected respectively between the shutter speed setting component and the indicator and between the computer and the indicator and arranged to be acted on alternately in sequence by a common pulse generator. When the previously selected combination of shutter speed and diaphragm aperture is not correct in conformity with the prevailing scene brightness, the indicator is caused to flicker between two positions for the automatic and manual shutter speed values. To attain correct adjustment of shutter speed and diaphragm aperture, the photographer may operate with either of the shutter speed and diaphragm aperture setting components until the amplitude of flickering of the indicator is reduced to zero, while looking through the finder as the indicator is visible in or adjacent the finder image field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.