Photographic film and film cassette
AssigneeEastman Kodak Company
InventorPatricia D. Fairman
Life of this patent
Estimating the term…
Abstract
A film cassette is disclosed wherein a filmstrip beginning with a relatively short non-protruding leader portion can be advanced automatically to the exterior of the cassette responsive to rotation of a film spool in a film unwinding direction. The filmstrip has one metering perforation per film frame in a relatively long imaging portion and several much closer spaced take-up perforations in its leader portion. Preferably, the take-up perforations are located along a different longitudinal edge of the filmstrip than the metering perforations are located, to positively prevent the possiblity of mistaking one of the take-up perforations for one of the metering perforations in a camera.
Claims7
An improved film cassette wherein (a) a filmstrip has a relatively short non-protruding leader portion and a relatively long imaging portion including a longitudinal series of spaced identical metering perforations having a common pitch to enable said imaging portion to be precisely metered for picture-taking in a camera and (b) a film spool is rotatable in a film unwinding direction to propel said filmstrip beginning with said leader portion out of said cassette for engagement of the leader portion with a take-up spool in the camera, and wherein the improvement comprises:
- said leader portion includes a longitudinal series of spaced identical take-up perforations having a common pitch that is substantially less than the pitch of said metering perforations to enable the leader portion to be engaged by a take-up spool in a camera, whereby because of the difference between the respective pitches of said metering perforations and said take-up perforations the possibility of mistaking the take-up perforations for the metering perforations in the camera may be prevented.
An improved filmstrip wherein (a) a relatively long imaging portion includes a longitudinal series of spaced identical metering perforations having a common pitch to enable said imaging portion to be precisely metered for picture-taking in a camera and (b) a relatively short leader portion is adapted for engagement with a take-up spool in the camera, and wherein the improvement comprises:
- said film leader includes a longitudinal series of spaced identical take-up perforations having a common pitch that is substantially less than the pitch of said metering perforations to enable the leader portion to be engaged by a take-up spool in a camera, whereby because of the difference between the respective pitches of said metering perforations and said take-up perforations the possibility of mistaking the take-up perforations for the metering perforations in the camera may be prevented.
Dependencies are inferred from the claim text.