Cameras
Abstract
Abstract The lamellar focal-plane shutter for monocular mirror reflex cameras comprises a swivelling viewfinder mirror and shutter blades returning automatically to their starting positions after each exposure operation. The intrinsically stationary end of an opening spring which is connected to an opening lever is fastened to a first tensioning plate and the intrinsically stationary end of a closing spring, which is connected to a closing lever, is fastened to a second tensioning plate. Both tensioning plates are interconnected by a coupling rod which is tensioned against the action of a return spring upon the winding and cocking action of the camera. The rod is held in this tensioned position by a detent lever which can be actuated for the release of the coupling rod by means of a releasing arm which is moved back to its start position when the viewfinder mirror returns to the observing position.
Inventors
- 👤 Rolf Noack
- 👤 Karl Kromer
Bibliographic Details
Claims Analysis
Total Claims: 4References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |