Electro-magnetically driven shutter
US4643553A · kind A · utility
3Cited by
5References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1985 |
| Grant date | Feb 17, 1987 |
| Priority date | — |
| Expiry date | Jun 5, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electro-magnetically driven shutter is arranged to make an exposure by driving shutter blades to travel with driving members with power supply effected to an electro-magnetic drive source and to cut off the power supply upon completion of the travel of the shutter blades. The shutter blades are kept in their travel completed positions by locking the driving members with spring members and then, in response to a film winding action, the driving members are unlocked by pushing back the driving members in a travel starting direction with the shutter blades being brought by inertia back to their travel start positions respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.