Slave electronic flash unit for a camera
US5023639A · kind A · utility
16Cited by
1References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1990 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Feb 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0557
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A slave electronic flash unit is removably mounted on a camera having a built-in electronic flash device and generates an auxiliary flash when a part of the flash generated by the built-in electronic flash device is directly detected by a photosensor. A slave electronic flash unit used in combination with a camera of a variable focal length can be flashed only when the camera is set to a telephotography mode in which an exposure is made that would otherwise be under-exposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.