Photographic lighting apparatus
US4304479A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1980 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Jul 28, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0535
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic camera having either a built-in or detachably connectable electronic strobe light which provides a preferred illumination distribution over the field of view of the camera in order to maximize flash range and improve the quality of illumination for flash pictures. The strobe is provided with a reflector that is asymmetrically shaped about the horizontal plane having optical power which decreases at different rates about the horizontal plane. This arrangement provides a vertically asymmetric distribution of illumination over the picture area with the peak illumination occurring at the central upper part of the picture area. Side to side illumination of the picture is generally symmetric about the vertical axis and is controlled by a cylindrical Fresnel lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.