Electronic flash control device employing a plurality of control signals
US5138361A · kind A · utility
7Cited by
11References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1991 |
| Grant date | Aug 11, 1992 |
| Priority date | — |
| Expiry date | Jun 10, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0503
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic flash control device makes sure that the emission of light of an electronic flash is not impaired by a noise component signal prior to generation of a suitable quantity of light by the flash. A trigger signal is applied by the control device to allow the flash to emit light. An enable signal is supplied to a quenching circuit a predetermined time after the noise of the trigger signal has been produced. When the quantity of light from an object to be photographed by the camera reaches a certain value and the enable signal occurs, the quench circuit suppresses the emission of light by the electronic flash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.