Photographic camera and film cartridge with double exposure prev

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

354207, 354275, G03B 700

Patent

active

053511018

ABSTRACT:
A photographic film cartridge has one or more resistive elements formed on the exterior surface of the cartridge with associated visual indicator elements to indicate exposure status of film in the cartridge. The camera is provided with a drive circuit to change the resistance values of the resistive elements to provide an electrically sensed indication of the film exposure status when next the cartridge is placed in the camera. Provision can be made for both full exposure and mid-roll interrupt indications. At the same time, the heat generated by the resistive element during its change in resistance value is useful to change a characteristic of the associated visual indicator to provide a visual indication of the exposure status of the film in the cartridge.

REFERENCES:
patent: 5030978 (1991-07-01), Stoneham et al.
patent: 5032854 (1991-07-01), Stoneham et al.
patent: 5047794 (1991-09-01), Pagano et al.
patent: 5115268 (1992-05-01), Kitagawa et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Photographic camera and film cartridge with double exposure prev does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photographic camera and film cartridge with double exposure prev, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photographic camera and film cartridge with double exposure prev will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1268726

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.