Visual exposure indicating system

Details Visual exposure indicating system Visual exposure indicating system

1997-08-07

1998-10-27

Mathews, A. A.

Photography

Camera detail

Detachable or removable film holder unit

396284, 396538, G03B 1726

Patent

active

RE0359360

ABSTRACT:
A film cassette includes a cassette body, a film spool onto which can be wound a strip of film drive disk coupled directly to the film spool, and an indicator flex disk that includes a film status indicator tab whose position relative to a window of the film cassette indicates the film exposure status. The position of the film status indicator tab is changed when the flex disk is moved into engagement with the drive disk and the film spool is rotated upon film movement. The film status indicator tab otherwise does not engage the drive disk and therefore does not change position. The cassette is particularly suited for operation with a photographic camera that includes a camera body, a loading chamber in the camera body that receives the film cassette, and a loading chamber cover having at least one movable indicator release pin that moves the flex disk into and out of engagement with the drive disk and thereby changes the position of the film status indicator tab. A camera controller determines the film status and controls the movement of the indicator release pin to selectively change the position of the film status indicator tab in accordance with the film status.

REFERENCES:
patent: 4978985 (1990-12-01), Smart et al.
patent: 5021816 (1991-06-01), Pagano et al.
patent: 5079579 (1992-01-01), Pagano et al.
patent: 5115268 (1992-05-01), Kitagawa et al.
patent: 5159365 (1992-10-01), Takahashi et al.
patent: 5278600 (1994-01-01), Takahashi et al.
patent: 5463435 (1995-10-01), Ezawa
patent: 5475454 (1995-12-01), Ezawa

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