Flash control method and apparatus for variable focal length camera
US5159379A · kind A · utility
13Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | May 20, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0553
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable focal length camera is provided with a built-in flash unit having a wide illuminating angle, and an external flash unit having a narrower illuminating angle can be externally attached to the camera. When the taking lens is set in a short focal length region, the external flash unit is used for pre-emission prior to an exposure so as to prevent the red-eye phenomenon, and a built-in flash unity is used for main-emission during the exposure. When the taking lens is set in a long focal length region, the built-in flash unit is used for the pre-emission and the external flash unit is used for the main-emission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.