Photographic film cassette and camera for use therein

Details Photographic film cassette and camera for use therein Photographic film cassette and camera for use therein

Filed on

1992-12-07

Date issued

1994-11-08

Examiner

Blankenship, Howard B.

Patent Class

Winding, tensioning, or guiding

SubClass

Coil holder or support

SubSubClass

Spool or core

Other Related Categories

354288, 2423483, 2423484, G03B 1726

Type

Patent

Status

active

Patent number

053631668

Description

ABSTRACT:
A photographic film cassette has photographic film wound on a spool and contained in a cassette shell. Rotation of the spool in the unwinding direction causes a leader to advance through a passageway and exit from a passage mouth. The passageway is defined by a pair of opposed inside faces. The first inside face confronts the emulsion surface of the photographic film, and the second inside face confronts its back surface. A separator claw is formed adjacent to the first inside face, and separates the leader from the roll. The separator claw is formed to project only to a small degree so that the photographic film is prevented from being rubbed and scratched thereby, even when the diameter of the roll is minimized. In a preferred embodiment, a camera for use with such a leader-advancing cassette has a receiving port, which is open to the inside of a cassette receiving chamber, and receives the photographic film as exited from the cassette. A front wall of the receiving port is formed so as to prevent the photographic film from being rubbed and scratched by the first inside face of the cassette.

REFERENCES:
patent: 4167318 (1979-09-01), Wareham
patent: 4516843 (1985-05-01), Ohmura
patent: 4641936 (1987-02-01), Harvey et al.
patent: 4832275 (1989-05-01), Robertson
patent: 4834306 (1989-05-01), Robertson et al.

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