Film-on-spool sensor for determining mode of operation of film t

Details Film-on-spool sensor for determining mode of operation of film t Film-on-spool sensor for determining mode of operation of film t

1986-06-05

1987-07-07

Perkey, W. B.

354214, G03B 118

Patent

active

046783032

ABSTRACT:
A photographic camera has a motorized film transport mechanism which is operable in a load mode after a light-tight cartridge containing an unexposed filmstrip is loaded into the camera and is operable in an expose mode for picture-taking. In the load mode, the transport mechanism first prewinds substantially the entire length of the filmstrip from the cartridge onto a take-up spool without exposing any of the frames on the filmstrip and then rewinds a predetermined length of the filmstrip off the take-up spool to position the first frame for exposure. In the expose mode, the transport mechanism rewinds the filmstrip one frame at a time back into the cartridge after each exposure is completed. When a shutter release member is manually actuated, a film-on-spool sensor cooperates with a bi-directional control to operate the transport mechanism in its load mode in response to sensing that the take-up spool is empty and to operate the transport mechanism in its expose mode in response to sensing that film is present on the take-up spool. Thus, the film-on-spool sensor determines the mode of operation of the transport mechanism.

REFERENCES:
patent: 4251148 (1981-02-01), Stemme et al.
patent: 4419001 (1983-12-01), Tominaga et al.
patent: 4460256 (1984-07-01), Araki
patent: 4494842 (1985-01-01), Kimura et al.
patent: 4504131 (1985-03-01), Kaisha
patent: 4568164 (1986-02-01), Sahori
patent: 4586801 (1986-05-01), Nishizawa et al.

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