Optical: systems and elements – Lens – With variable magnification
Patent
1998-07-16
1999-07-27
Epps, Georgia
Optical: systems and elements
Lens
With variable magnification
359689, 359717, G02B 1514
Patent
active
059300523
ABSTRACT:
A zoom lens system comprises a first lens group of positive power and a second lens group of negative power. The zoom lens system is arranged to perform a zooming operation by varying a distance between the first lens group and the second lens group. Furthermore, the first lens group comprises a front sub lens group of negative poser and a rear sub lens group of positive power. Still further, the front sub lens group comprises a first single lens element of negative power and a second single lens element having an aspherical surface on which the radius of curvature becomes larger in the off-axis region, and the rear sub lens group of the first lens group comprises a cemented lens having a positive lens element and a negative lens element. Moreover, the zoom lens system satisfies various conditions.
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Enomoto Takashi
Ito Takayuki
Asahi Kogaku Kogyo Kabushiki Kaisha
Epps Georgia
Lester Evelyn A.
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