Frame counter initialization sensor for triggering film rewind w

Details Frame counter initialization sensor for triggering film rewind w Frame counter initialization sensor for triggering film rewind w

1986-06-02

1987-06-30

Perkey, W. B.

354214, 354217, G03B 100, G03B 1736

Patent

active

046766219

ABSTRACT:
A photographic camera has a motorized film transport mechanism which is operable to continuously prewind substantially the entire length of a filmstrip from a light-tight cartridge onto a take-up spool without exposing any of the frames on the filmstrip and to intermittently rewind the filmstrip one frame at a time back into the cartridge after each exposure is completed. A frame counter is incremented during prewinding of the filmstrip onto the take-up spool to provide a count of the maximum number of frames to be exposed and is decremented during rewinding of the filmstrip back into the cartridge to provide a count of the remaining number of frames to be exposed. If a rear door of the camera is accidentally or inadvertently opened before the filmstrip is completely wound off the take-up spool, the frame counter is initialized to an original setting. Then, a counter initialization sensor and a film-on-spool sensor cooperate with a control circuit to operate the motorized film transport mechanism to continuously rewind the filmstrip remaining on the take-up spool back into the cartridge.

REFERENCES:
patent: 4251148 (1981-02-01), Stemme et al.
patent: 4281911 (1981-08-01), Engelsmann et al.
patent: 4297019 (1981-10-01), Ishii et al.
patent: 4362370 (1982-12-01), Yoshino
patent: 4419001 (1983-12-01), Tominaga et al.
patent: 4460256 (1984-07-01), Araki et al.
patent: 4494842 (1985-01-01), Kimura et al.
patent: 4504131 (1985-03-01), Kimura
patent: 4568164 (1986-02-01), Sahori

Affiliated with

Also associated with

Rating

Frame counter initialization sensor for triggering film rewind w does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frame counter initialization sensor for triggering film rewind w, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frame counter initialization sensor for triggering film rewind w will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-444683