Camera apparatus for preventing double-exposure of film returned to a self-thrusting cassette
US4994833A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Mar 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a camera for exposing a filmstrip normally stored in a light-tight cassette which is inherently capable of thrusting the filmstrip out of the cassette regardless of the exposure condition of the filmstrip but has a film-exposure status indicator movable from an unexposed position for providing a visible indication that the filmstrip is generally unexposed, to a partly exposed position for providing a visible indication that the filmstrip is partly exposed, and to an exposed position for providing a visible indication that the filmstrip is substantially exposed, apparatus is provided for preventing exposure of the filmstrip when the status indicator is in its exposed position and for permitting exposure of the filmstrip when the status indicator is in its unexposed or partly exposed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.