Film cassette dark slide incorporating a projection for restraining impact-generated movement
US5345289A · kind A · utility
3Cited by
2References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1993 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Sep 8, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dark slide is located within a film cassette to shield film units from exposure to light prior to the insertion of the cassette into a camera. The slide is maintained in position within the exposure opening of the cassette by a truncated ridge struck from the slide to project above its upper surface. The struck portion of the slide is configured to engage an abutment in the forward wall of the film cassette to prevent the premature ejection of the dark slide as a result of impacts on the cassette and to collapse and thereby disengage from the abutment when the slide is ejected from the camera by a film unit advancing pick.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.