Film cassette with shutter light-lock
US5112003A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1991 |
| Grant date | May 12, 1992 |
| Priority date | — |
| Expiry date | Jun 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/268
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a film cassette, a cassette shell has a pair of throat portions which together define a film passageway to the exterior of the shell, a spool is supported for rotation in an unwinding direction inside the shell, a convoluted film roll whose outermost convolution is a film leader is coiled about the spool, and a stripper is located immediately inwardly of the passageway to be received between a leading end of the film leader and a next-inward convolution of the film roll responsive to rotation of the spool in the unwinding direction to divert the leading end into the passageway to permit the leading end to be advanced from the shell. According to the invention, an inclined surface along one of the throat portions and an inclined surface along the other throat portion are arranged in offset co-planar relation, and a resiliently flexible shutter blade has two opposite ends one of which is secured to the inclined surface along one of the throat portions and the other of which rests freely against the inclined surface along the other throat portion to permit the leading end of the film leader to deflect the shutter blade out of its way when the leading end is advanced from the shell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.