Zoom lens system

Details Zoom lens system Zoom lens system

1998-11-25

2000-06-20

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359681, 359680, 359683, G02B 1514

Patent

active

060784350

ABSTRACT:
A zoom lens system having a negative first lens group and a positive second lens group in this order from the object, each of which is arranged to move for zooming; the first negative lens group including a first single positive lens element, a second single negative meniscus lens element having convex surface facing the object, a third single negative lens element and a fourth a positive single lens element having a convex surface facing the object, in this order from the object; the second positive lens group including a fifth a positive biconvex single lens element, a sixth positive single meniscus lens element having the convex surface facing the object, a seventh negative biconcave single lens element and an eighth positive single lens element, in this order from the object; and the following condition is satisfied:

REFERENCES:
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patent: 4474436 (1984-10-01), Itoh
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patent: 4726667 (1988-02-01), Tachihara
patent: 5278699 (1994-01-01), Ito et al.
patent: 5283693 (1994-02-01), Kohno et al.
patent: 5331464 (1994-07-01), Ito et al.
patent: 5424871 (1995-06-01), Ito et al.
patent: 5485314 (1996-01-01), Sato
patent: 5546232 (1996-08-01), Hirakawa
patent: 5899585 (1999-05-01), Ogawa

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