Full/fill flash control system for cameras
US4772910A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1988 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Jan 19, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An artificial illumination control system for controlling the energization of an electronic flash device during a photographic exposure interval in a camera automatically operates in a full flash mode whenever the ambient light level is too low for a proper daylight exposure and the camera-to-subject distance does not exceed a maximum distance suitable for a full flash exposure. Moreover, it automatically operates in a fill flash exposure whenever the ambient light level is bright enough that areas of the subject may be substantially shadowed and the camera-to-subject distance does not exceed a maximum distance small enough to ensure that the fill flash output will lighten the shadowed areas. The maximum distance for a fill flash exposure is always less than the maximum distance for a full flash exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.