Shutter device for camera
US4322145A · kind A · utility
13Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1980 |
| Grant date | Mar 30, 1982 |
| Priority date | — |
| Expiry date | Apr 18, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an electromagnetically driven shutter device for camera, so designed that a detecting means for detecting the displacement speed of the shutter member and the power supply means for supplying the driving energy to the shutter member are provided in such a manner that the output of the power supply means is varied in accordance with the output of the detecting means so as to maintain the displacement speed of the shutter member constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.