Photographic flash apparatus
US5287134A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Dec 28, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0553
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic strobe flash apparatus includes a first energizable flash tube arranged to project light in a first direction to directly illuminate a scene, a second energizable flash arrange to project light in a second direction to indirectly illuminate the scene, a battery power supply for providing a source of charging energy, first and second high voltage discharge capacitors coupled to the first and second flash tubes, and electronic control means for providing charging current from the power supply to the first high discharge voltage capacitor until it is charged to a predetermined discharge voltage and for then charging the second high voltage discharge capacitor to the predetermined discharge voltage level. Preferably, the electronic control means includes a single DC/DC converter coupled through a miniaturized relay to the first and second high voltage capacitors to successively charge each under charge control signals provided by a microcontroller. The charging of the first high voltage discharge capacitor to the predetermined high voltage level takes place more rapidly than the charging of the second high voltage discharge capacitor, since the capacitance of the latter e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.