Film and photographic apparatus
AssigneeEastman Kodak Company
InventorEvan A. Edwards
Life of this patent
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Abstract
A film magazine contains a roll of film having an image portion and a leader. The filmstrip is perforated at predetermined intervals with larger perforations in the image portion than in the leader. A camera mechanism is disclosed which uses the perforations to advance the filmstrip, detects the size of the perforations, and meters only when a large, image portion perforation is advanced to a predetermined position in the camera.
Claims2
In a photographic filmstrip having an image portion and a leader;
- the improvement comprising:
- at least one row of perforations of a pre-determined size along the image portion;
- and
- at least one row of perforations in the leader, said perforations in the leader being aligned with and smaller in a direction longitudinally of said filmstrip than the perforations along the image portion.
In a filmstrip adapted for use with photographic apparatus of the type having (1) a transport mechanism for advancing the filmstrip, (2) means for sensing perforations in the filmstrip and for distinguishing between different sized perforations, and (3) means for metering the transport mechanism upon detection of a perforation of at least a predetermined size;
- the improvement in said filmstrip comprising:
- an image portion having perforations of at least said predetermined size at metering intervals along said image portion;
- and
- a leader having perforations of less than said predetermined size spaced therealong, whereby the transport mechanism will not be metered upon the perforations in said leader being sensed and will be metered upon the perforations in said image portion being sensed.
Dependencies are inferred from the claim text.