Camera with film sensor to determine when to close cassette not urged against filmstrip during exposure
US6012857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1999 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Feb 3, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera comprising a chamber for a film cassette having a film spool inside the cassette that is windingly rotated to progressively wind an exposed filmstrip into the cassette and a light lock that is to be closed after the exposed filmstrip is completely wound into the cassette, a rotatable film winder for windingly rotating the film spool, a film sensor urged against the exposed filmstrip before the exposed filmstrip is completely wound into the cassette to sense the presence of the exposed filmstrip, and a closing mechanism movable to close the light lock when the exposed filmstrip is completely wound into the cassette, is characterized in that the film winder has an urging component that urges the film sensor against the exposed filmstrip only when the film winder is rotated, whereby the film sensor is not urged against the exposed filmstrip when the film winder is stationary. Thus, the film sensor will not distort the filmstrip during exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.