Shutter control apparatus for a camera
US4769667A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1987 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Jul 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/083
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera shutter control apparatus comprises a detector for detecting the actual amount of opening of a camera shutter, comprised by a light emitter, a light detector, and a light controller for varying the amount of light passing therethrough from the light emitter to the light detector according to the detected amount of opening of the shutter. A controller controls the light emitter to emit a predetermined constant amount of light based on an output from the light detector. An operating device actuates the shutter in such a way to make the output of the light detector coincide with a signal representative of a predetermined shutter opening characteristic. The shutter is controlled to open and close following the predetermined characteristic defined by a shutter opening-closing program which is changeable according to the focal length of the camera lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.