Patent
1978-04-14
1982-10-12
Gonzales, John
350255, 350429, G02B 710, G03B 310
Patent
active
043536344
ABSTRACT:
A front component of a varifocal camera objective, axially shiftable for focusing purposes, is provided with a lens mount held by an axially extending guide rod which is slidably received in an inner annular flange and an end wall of a lens barrel. The lens mount has a pin projecting through an axial guide slot in the lens barrel into a camming groove in a surrounding milled setting ring. A rearward extension of the guide rod, nonrotatable but axially slidable with reference thereto against the force of a tension spring, is provided with male threads engaged by a drive nut held captive in the end wall, the nut being provided with outer gear teeth meshing with a pinion which is driven by a reversible electric motor via a slipping clutch. Upon retraction of the threaded extension by the drive nut, the tension spring holds the pin of that lens mount against the rear edge of its camming groove; the width of that groove and the axial length of the guide slot are sufficient to let the motor drive the lens mount over at least part of the available focusing range in a given position of the setting ring.
REFERENCES:
patent: 3482500 (1969-12-01), Thomas
patent: 3610733 (1971-10-01), Back
patent: 4057327 (1977-11-01), Kumazawa
patent: 4110769 (1978-08-01), Schutz et al.
patent: 4200377 (1980-04-01), Holderbaum
Gonzales John
Jos. Schneider & Co. Optische Werke Kreuznach
Ross Karl F.
LandOfFree
Focusing mechanism for camera objective does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focusing mechanism for camera objective, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focusing mechanism for camera objective will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-221535