Light shield for closing the film slot of a film cartridge
US5560563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Jun 2, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/265
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light shield (40, 100) for closing the film slot (33) in a film cartridge (20) is configured as a light shielding strip (40, 100) which extends around a film strip (26) coiled on a supply spool (25) within the film cartridge (20). The light shielding strip (40, 100) has a first end portion (44, 102) for covering the film slot (33) and a second end portion (54) for engagement by the film lead (56) of the film strip (26). When the film strip (26) is initially advanced, detents (64) on the light shielding strip (26) are engaged temporarily by teeth (66) on the supply spool (25) to pull the light shielding strip (26) open so that the film strip (26) projects from the cartridge (20). Upon rewinding the film strip (26), a film lead portion (56) of the film strip (26) engages other detents (72, 142) on the light shielding strip (40, 100) to push the light shielding strip (40, 100) back over the film slot (33) to thereby again close the film slot (33).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.