Optical: systems and elements – Lens – With variable magnification
Patent
1993-07-09
1995-09-05
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359683, 359684, 359691, G02B 1514
Patent
active
054484120
ABSTRACT:
A telephoto zoom lens system is disclosed in which the wide-angle end starts with the middle telephoto range and in which focusing is done by means of a lighter focusing lens group than what is used in the method of focusing by advancing the front lens component and that only small aberrational variations occur even if zooming is done up to the closest focusing distance. The telephoto zoom lens system includes a front lens component and a rear lens component, said front lens component comprising a front lens group and having, in order from the object side, a positive first sub-group 1a and a positive second sub-group 1b and having an overall positive power. The first sub-group 1a is such that a negative meniscus lens having a convex surface directed towards the object is located closest to the image plane, and the rear lens component is located closer to the image plane than the front lens component and having a zooming capability, focusing for the object being effected by moving only the second sub-group 1b towards the object when it is positioned at near distance.
REFERENCES:
patent: 4468097 (1984-08-01), Hamanishi
patent: 4848883 (1989-07-01), Maruyama
patent: 4948234 (1990-08-01), Mihara
patent: 5144489 (1992-09-01), Shibayama
patent: 5159493 (1992-10-01), Tsutsumi
patent: 5272564 (1993-12-01), Suzuki et al.
patent: 5321554 (1994-06-01), Ishiyama et al.
Hirakawa Jun
Maruyama Koichi
Asahi Kogaku Kogyo Kabushiki Kaisha
Epps Georgia Y.
Papalas Michael A.
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