Photographic exposure control system having selectable ambient and flash modes
US4431286A · kind A · utility
1Cited by
14References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1981 |
| Grant date | Feb 14, 1984 |
| Priority date | — |
| Expiry date | Oct 13, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic exposure control system of the type embodying scanning shutter blade elements includes a control blade selectively actuatable in accordance with whether the photographic apparatus is utilized in an ambient or artificial scene-lighted mode of operation for controlling which of two separate sets of photocell sweep secondary apertures in the shutter blade elements will direct scene light to a photoresponsive element while at the same time controlling a maximum effective primary aperture to which the shutter blade elements are allowed to progressively increase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.