Film cassette with interacting spool lock and light shield
US5319407A · kind A · utility
15Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 16, 1993 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Jun 16, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film cassette comprises a rotatable film spool, a light shield for preventing ambient light from entering the cassette interior, and a locking pawl movable into engagement with the spool to inhibit rotation of the spool but being forced out of engagement with the spool when the spool is rotated. According to the invention, the light shield is movable to open and the locking pawl is arranged to move the light shield to open responsive to the locking pawl being forced out of engagement with the spool when the spool is rotated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.