Exposure control system for a camera
US4011569A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1975 |
| Grant date | Mar 8, 1977 |
| Priority date | — |
| Expiry date | Sep 30, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/089
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure control system for a camera of the type provided with shutter preselection and diaphragm preselection automatic exposure ranges and with a manual exposure range. A switching arrangement responds to a selected range by selectively establishing one of three possible combinations of channels. These transmit photographic analog information from exposure control parameter setting means, which include means for preselection of a desired shutter time and/or diaphragm aperture to exposure determining means which have shutter and diaphragm control means, either directly or through a computer circuit. This switching arrangement is rendered less susceptible to and adapted for incorporation in a semiconductor device with integrated circuits normalized for various types of cameras including the type having an individual single exposure range and is amenable to relatively low cost unit production techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.