Patent
1980-11-12
1982-03-16
Griffin, Donald A.
G03B 907
Patent
active
043198244
ABSTRACT:
A diaphragm for photographic cameras and the like, of the type where the diaphragm closes down rapidly from a wide open aperture for viewing to a preselected smaller aperture for picture taking, immediately prior to the actual exposure. The usual slotted ring connected to the diaphragm leaves or blades is stopped in its running down movement by contact with an interception ring whose position is determined by a diaphragm presetting member, the contact between the interception ring and the presetting member including a resiliently displaceable ball. As the slotted ring runs down, it is stopped by impact with the interception ring, which absorbs some of the kinetic energy of the slotted ring, and the resiliently mounted ball connection with the position determining lever (stationary at this time) allows the interception ring to move slightly further beyond the position to which it has been preset, thus bringing the moving parts to a smooth cushioned stop and effectively damping any rebound or bounce which might otherwise occur as a result of quickly stopping the fast running down movement of the diaphragm.
REFERENCES:
patent: 3687047 (1972-08-01), Ito
patent: 3864714 (1975-02-01), Sasaki
Carl Zeiss-Stiftung
Griffin Donald A.
LandOfFree
Rebound damping means for fast-closing photographic diaphragms does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rebound damping means for fast-closing photographic diaphragms, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rebound damping means for fast-closing photographic diaphragms will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1639683