Photo film take-up spool and shaft
US6195506A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1998 |
| Grant date | Feb 27, 2001 |
| Priority date | — |
| Expiry date | Sep 4, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2219/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A take-up shaft is adapted to taking up photo film from a photo film cassette having the photo film, and particularly used in a lens-fitted photo film unit. The photo film cassette includes a cassette spool on which the photo film is wound in a roll form. A cassette shell contains the cassette spool in rotatable fashion. The take-up shaft has a shaft body (46, 53, 72, 81) having a substantially cylindrical shape. A nip device (47, 52, 73) is disposed inside the shaft body, and nips a leader (26b) in removable fashion. The shaft body is rotated with the leader, to wind the photo film in a roll form (26a). At least one curved face (46c, 53c, 57b, 62b, 64c, 72a, 81a) is formed between the inside of the shaft body and a cylindrical face of the shaft body and at a radius of curvature 0.4-0.85 time as long as a radius of the shaft body, and prevents the leader secured to the shaft body from being sharply bent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.