Photographic film cassette

Details Photographic film cassette Photographic film cassette

1991-09-10

1994-01-11

Gellner, Michael L.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

242 711, G03B 1726

Patent

active

052786005

ABSTRACT:
The rotation of a spool of a photographic film cassette in a film unwinding direction in a camera advances a film leader out of a cassette shell through a film passage mouth. An indicator window is formed on a surface of the cassette shell. A rotatable indicator wheel behind the indicator window carries an indication representing a degree of exposure of the photographic film, or unexposed, exposed, and numerals for frames at which the latest photograph was taken. A drive wheel is rotated in linkage with the spool for rotating the indicator wheel in order to move the indication into the indicator window. A clutch pin, which is connected with a pin receiver, transmits movement of the drive wheel to the indicator wheel when the spool rotates in the film unwinding direction. The indicator wheel is left separated from the drive wheel with the clutch pin disconnected from the pin receiver, when rotating the spool in a film rewinding direction. In a preferred embodiment, a toothed wheel, which carries an indicator for displaying the amount of film used, is rotated by the camera when advancing the photographic film. In another preferred embodiment, a heat-sensitive label is provided on the cassette shell for displaying the amount of film used in a visible manner by being heated according to the degree of film exposed in the camera.

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patent: 4962401 (1990-10-01), Takahashi
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patent: 5048770 (1991-09-01), Baxter et al.
patent: 5106030 (1992-04-01), Pagano et al.

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