Photographic lighting apparatus
US4356538A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1980 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Aug 4, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0535
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electronic strobe light which can either be built into or detachably connected with a photographic camera to provide 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 light includes a reflector that is bilaterally symmetric about the horizontal having a shape represented by a 6th order polynomial and a strobe tube which has its center offset with respect to the plane of symmetry of the reflector. This arrangement provides a vertically asymmetric distribution in the intensity of illumination over the picture area with higher intensities occurring at the central upper part of the picture area. Side-to-side illumination intensity is generally symmetric about the vertical and is controlled by a cylindrical Fresnel lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.