Patent
1978-04-19
1980-04-15
Henry, Jon W.
350184, G02B 1514, G02B 710
Patent
active
041981294
ABSTRACT:
An optical objective of variable focal length comprises a varifocal front lens group consisting of at least four components of alternating refractivity, namely a stationary negative first component, a movable positive second component, a movable negative third component and a movable positive fourth component. The second component is linearly displaceable, over the entire varifocal range, between a wide-angle position and a telephoto position. The third component remains stationary over several subranges (.beta.), during which the image plane of the objective passes once or twice through a zero position, but moves parallel to the second component in intervening range segments (.gamma.). The fourth component moves parallel to the second component over the whole range except in two terminal zones (.alpha.) at the wide-angle and telephoto ends. A reversal of the image-plane excursion occurs in each of the terminal and intervening range portions (.alpha., .gamma.), yielding additional zero positions. The intermittent entrainment of the third and fourth components by the second component can be brought about by cams, by a mechanical linkage of the lost-motion type, or by stepping motors under the control of a microprocessor.
REFERENCES:
patent: 2778272 (1957-01-01), Reymond
patent: 3051052 (1962-08-01), Bergstein
patent: 3192829 (1965-07-01), Yamaji
Bolex International S.A.
Henry Jon W.
LandOfFree
Varifocal lens system with three moving components does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Varifocal lens system with three moving components, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Varifocal lens system with three moving components will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-473633