Electromagnetically operated diaphragm shutter
US4390262A · kind A · utility
43Cited by
3References
56Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Sep 23, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/087
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electromagnetic diaphragm shutter mechanism is provided with an electromagnet in the form of a coil or a printed circuit pattern arranged on a sector ring of the shutter mechanism. With a magnetic field applied to the electromagnet, when current is caused to flow therethrough in a prescribed direction, the sector ring is driven to rotate. A light measuring diaphragm mechanism related to the exposure diaphragm of the shutter blades serves to control the shutter and to improve the accuracy of program control of the shutter, the sector ring being always urged to move in a direction to close the shutter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.