Shutter control device for camera
US4763155A · kind A · utility
8Cited by
2References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1987 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Jan 13, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera has a shutter device driveable to undergo opening movement to open an aperture to effect exposure operation according to a given exposure value, and a motor actuatable to rotate at an unstable rotational speed for driving the shutter device. A detector operates after the motor starts rotating and before the shutter device undergoes its opening movement for detecting the rotational speed of the motor. A controller adjusts the shutter device in accordance with the detected rotational speed of the motor to thereby enable the shutter device to effect the exposure operation so as to accurately achieve the given exposure value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.