Apparatus for discriminating between a film notch and metering perforations in an automatic camera
US5659830A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1996 |
| Grant date | Aug 19, 1997 |
| Priority date | — |
| Expiry date | Mar 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for use in an automatic film winding camera for determining, during film loading, the presence of a film leader portion having a notch therein. First and second film perforation sensors positioned apart along a film advancing path of the film in first and second sensor positions are enabled and disabled in a sequence in which the first and second sensors successively detect the advancement of the film's leading edge at the first and the second sensor positions. The first sensor is then enabled for sensing the film perforations when the notch in the film leader portion is positioned between the first and second sensor positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.