Film cassette with bar-coded film spool and provision for film double exposure prevention
US5347334A · kind A · utility
31Cited by
5References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1993 |
| Grant date | Sep 13, 1994 |
| Priority date | — |
| Expiry date | Nov 30, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/263
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic film cassette is provided with a radial bar coded disk having first and second arcuate segments of differing radial lengths to form a gap between the disk and a circumferential lip of the cassette housing. When the cassette is removed from a camera after the film has been fully or partially exposed, the gap is positioned so as to align with a double exposure prevention hook in the camera. During a subsequent attempt to insert the cassette into the camera, the hook enters the gap and engages the housing lip to thereby prevent complete insertion of the cassette.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.