Exposure control system and a motion picture camera using the same
US4046464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Jun 20, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic exposure control system for controlling the diaphragm of a motion picture camera in accordance with the object brightness level photoelectrically determined from the amount of light passing through the diaphragm is provided with a manually switchable shutter control device having a number ofswitched positions including positions for selection of various speeds of rotation of the camera shutter and for selection of various shutter intervals each effected in one revolution of the shutter in combination with a corresponding number of branch circuits of the exposure metering device controlling operation of the camera diaphragm, whereby it is made possible to make exposures not only at normal light levels but also at low light levels outside the lower limit of the normal light level range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.