Photographic camera having a double exposure protection device combined with a film cartridge indicator
US5809352A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1997 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Oct 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/263
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera for use with a film cartridge having a retractable lip portion that is retracted upon exposure of film in the cartridge, and that is fully extended before exposure of the film, the camera comprises a camera body for forming a protective enclosure. A double exposure hook is disposed in the camera body that latches onto a recess in the retractable lip portion when the film is exposed upon insertion of the cartridge into the camera body for preventing double exposure of the film, and that is forced outwardly upon insertion of the film cartridge when the film is not exposed for permitting the cartridge to be fully inserted. A movable element includes a first position that obstructs viewing through a viewfinder when the cartridge is not inserted, and that is moved to a second position by the double exposure hook upon insertion of the cartridge for permitting viewing through a viewfinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.