Camera having an upstream read only magnetic sensor to detect exposed image areas on magnetically coated film
US5678087A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1996 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Jul 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2217/263
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a camera having an exposure film gate and device for advancing a film strip past the gate, the film strip having successive image areas with a magnetic track adjacent to each image area, wherein one or more of the image areas are exposed and have information magnetically recorded in the adjacent magnetic track of an exposed image area, the improvement comprising a thin film read only magnetic sensor located relative to the film gate so as to be upstream of the gate when the means advances the film strip past the gate, the sensor reading each the magnetic track adjacent to an image area to determine whether the image area has been exposed or not so as to detect an unexposed image area before it is advanced to the film gate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.