Optical: systems and elements – Lens – With variable magnification
Patent
1997-03-25
1998-04-28
Sugarman, Scott J.
Optical: systems and elements
Lens
With variable magnification
359731, 396379, G02B 1514, G02B 1708, G03B 1302
Patent
active
057453020
ABSTRACT:
An inverted Galilean zoom view finder equipped with a framing mark projection feature comprises in order from the object side to the image side a positive power objective lens L.sub.1 which is a by-convex singlet having a strong curvature of object side surface, a negative power lens L.sub.2 which is a by-concave singlet having a strong curvature of image side surface, and a negative power eye piece lens L.sub.3 which is a meniscus singlet having a strong curvature of concave surface at the object side. The negative power lens L.sub.2 is movable relative to both positive power objective lens L.sub.1 and negative power eye piece lens L.sub.3 along the optical axis X to vary the magnitude of the finder lens system, and the eye piece lens is formed with a reflective surface around a half transparent surface at the image side for reflecting back an image of framing mark and directing the image into the view of the zoom view finder.
REFERENCES:
patent: 4256396 (1981-03-01), Kawaguchi et al.
patent: 4650293 (1987-03-01), Kimura et al.
patent: 5086353 (1992-02-01), Mukai et al.
Fuji Photo Optical Co., Ltd.
Sugarman Scott J.
LandOfFree
Inverted Galilean type zoom finder lens 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 Inverted Galilean type zoom finder lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inverted Galilean type zoom finder lens system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1538588