Film exposure counter

Details Film exposure counter Film exposure counter

1988-02-04

1989-03-21

Gellner, Michael L.

G03B 166

Patent

active

048148059

ABSTRACT:
Automatic film advance in a camera to wind a film leader onto a take-up spool requires that an override switch be temporarily closed to nullify a film metering switch. Otherwise, the metering switch will de-energize a motorized film drive after the film leader is advanced only a single frame width, rather than the required several frame widths. To ensure that a mechanical exposure counter is rotated sufficiently from an initialized setting to close the override switch, when a drive member for the counter is rotated less than its normal distance because of lost motion in actuating the drive member following previous rewind of an exposed film off the take-up spool, the drive member and the counter include cooperating means adapted to rotate the counter the same angular distance from its initialized setting as the angular distance the counter is rotated from successive settings, with less rotation being required of the drive member during its first revolution.

REFERENCES:
patent: 4400074 (1983-08-01), Akiyama et al.
patent: 4676621 (1987-06-01), Desormeaux
patent: 4707096 (1987-11-01), Lawther

Affiliated with

Also associated with

Rating

Film exposure counter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Film exposure counter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Film exposure counter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-480435