Electromagnetically driven shutter with focus adjusting function
US4505567A · kind A · utility
5Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1983 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Mar 16, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B3/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In the disclosed electromagnetically driven shutter a shutter release produces a first flow of current that electromagnetically moves a rotor coil arranged in a magnetic field to a position where it unlatches an automatic focusing operation and where it is locked to prevent backward motion. Termination of the focusing condition starts an exposure control arrangement and initiates a second current flow that moves the rotor coil further to control opening and closing of the shutter blades. Thus, two successive current flows coordinate the focus operation and the exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.