Film cartridge with film-exposed visual indicator
US5715494A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1996 |
| Grant date | Feb 3, 1998 |
| Priority date | — |
| Expiry date | Apr 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/263
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film cartridge comprising a rotatable film spool, an indicator window, an annular indicator wheel rotatable behind the indicator window to move a film-exposed indication on the indicator wheel to the indicator window, and an annular drive wheel rotatably coupled with the film spool for rotating the indicator wheel to move the film-exposed indication to the indicator window, is characterized in that the indicator wheel is resilient and a flex-inducing protuberance is located to distort successive portions of the indicator wheel towards the indicator window as the indicator wheel is rotated, to position the film-exposed indication in the indicator window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.