Film feeding apparatus

Details Film feeding apparatus Film feeding apparatus

1996-09-16

1998-07-21

Malley, Daniel P.

Photography

With film drive

Having significant electronic circuit detail

355 75, G03B 118

Patent

active

057846596

ABSTRACT:
A film feeding apparatus of a camera using a film having two perforations per frame detects the end of the film by detecting the final frame of the film. The film feeding apparatus comprises a detecting means for detecting the passage of a first perforation to detect a feeding speed of the film, a setting means for setting a predetermined limit value (limiter time) in accordance with the feeding speed, a film end determining means for determining that the film has ended when the passage, of a second perforation is not detected within the set limit value while the film is wound up. The film feeding apparatus feeds the film in accordance with a predetermined procedure of one-frame winding up and rewinds the film when the film has ended.

REFERENCES:
patent: 4443084 (1984-04-01), Harada et al.
patent: 4954859 (1990-09-01), Kitazawa
patent: 5210562 (1993-05-01), Miyazawa et al.
patent: 5249009 (1993-09-01), Tsuru et al.
patent: 5452055 (1995-09-01), Smart
patent: 5506648 (1996-04-01), Kazami et al.
patent: 5543878 (1996-08-01), Muakami
patent: 5574529 (1996-11-01), Akira
patent: 5576785 (1996-11-01), Kazami et al.

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