Simple camera for use with film cassette having film-exposure status indicator
US4947197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Sep 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/266
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A simple inexpensive camera to be used with a film cassette having a film-exposure status indicator movable from an unexposed position for providing a visible indication that a filmstrip within the cassette is generally unexposed, to a partly exposed position for providing a visible indication that the filmstrip is only partly exposed, and to an exposed position for providing a visible indication that exposure of the filmstrip is completed, is adapted to move the status indicator from its unexposed position to its exposed position, without stopping at its partly exposed position, substantially when film drive means of the camera changes the state of the filmstrip relative to the cassette. The change of state of the filmstrip relative to the cassette may be accomplished in the camera either by advancing the filmstrip from the cassette to expose the filmstrip or by returning the filmstrip to the cassette to safeguard the filmstrip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.