Optical: systems and elements – Lens – With variable magnification
Patent
1994-10-19
1996-11-19
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359700, 359696, 359823, 359824, G02B 1514, G02B 702
Patent
active
055768946
ABSTRACT:
A zoom lens barrel based on the vari-focal optical system includes a zoom cam ring which is supported only rotatably about the optical axis and a focus cam ring which is supported movably only in the axial direction both fitted on a fixed tube inside a lens barrel. For the alteration of the lens focal length, the zoom cam ring is turned to carry out zooming, and for the focusing of an object, the focus cam ring is moved in the axial direction to carry out focusing, thereby preventing the interference between zooming and focusing caused by the movement of the lens sets. A drive mechanism based on a piezo-electric element is used to move the focus cam ring in the axial direction, thereby simplifying the structure and reducing the weight.
REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto
patent: 4961635 (1990-10-01), Kondo
patent: 5018843 (1991-05-01), Inadome
patent: 5115267 (1992-05-01), Kondo
patent: 5159370 (1992-10-01), Takahashi
patent: 5182591 (1993-01-01), Kawasaki
patent: 5198847 (1993-03-01), Takahashi
patent: 5223877 (1993-06-01), Kawasaki
patent: 5281796 (1994-01-01), Kaneda
patent: 5347333 (1994-09-01), Takahashi
Kuwana Minoru
Miyano Masaaki
Miyazawa Masayuki
Suzuki Shin'ichi
Ueyama Masayuki
Epps Georgia Y.
Mack Ricky
Minolta Co. , Ltd.
LandOfFree
Zoom lens barrel based on the vari-focal optical system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Zoom lens barrel based on the vari-focal optical system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens barrel based on the vari-focal optical system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-545200