Flash photography system
US4558939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1983 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Oct 24, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A flash photography system for a photographic camera and a flash device adapted to be connected thereto with the camera providing an aperture value output for flash light photography and a flash light stop signal obtained from an integrated output of the light reflected from a photographic object to terminate flash light emission when the integrated value reaches a predetermined value. The flash device calculates a maximum photographing distance covered by the flash light for effecting a correct exposure of the photographic object from the maximum flash light value and the aperture value from the camera. The maximum photographing distance is displayed by a suitable display visible to the camera operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.