Flash photography system
US4939534A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1988 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Dec 2, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A flash photography system which comprises a photographic camera and an electronic flash device; said photographic camera comprising PA1 aperture value output means for producing aperture value under the flash light photographing, PA1 flash light stop signal output means for integrating output value of a light value of a photographing object and for producing a signal for stopping emission of a flash light when the integrated value reaches a predetermined value, said flash device comprising PA1 calculating means for calculating a maximum photographing distance which is covered by the flash light for effecting a correct exposure on the photographing object on the basis of a maximum light value of the flash light and the aperture value fed from the aperture value output means, and PA1 display means for displaying the maximum photographing distance on the basis of the output of the calculating means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.