Electromagnetically driven shutter
US4348092A · kind A · utility
17Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1981 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | Feb 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an electromagnetically driven shutter with a rotor having a conductive coil pattern and a stator with permanent magnets arranged thereon to form a magnetic field in which the rotor is driven to rotate, the rotor is provided with a return spring urging the shutter blades in a closing direction while nevertheless preventing bouncing of the rotor resulting from operation of the return spring when the shutter blades are fully opened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.