Flash photography system
US4550996A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1983 |
| Grant date | Nov 5, 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 using a first aperture value output calculated from a desired diaphragm aperture value for flash light photographing with data obtained from ambient light, film sensitivity and the exposure data, a second aperture value output independent of the light value of the ambient light, data selecting circuitry for outputting any one of the first aperture value output and the second aperture value output, an aperture controller for controlling the actual diaphragm aperture size from the output of the data selecting circuitry, and means for producing a stopping signal to stop the emission of the flash light when the flash light emission reaches a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.