Two lens group zoom lens system with a high zooming ratio

Details Two lens group zoom lens system with a high zooming ratio Two lens group zoom lens system with a high zooming ratio

1998-02-13

1999-11-16

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359691, G02B 1514

Patent

active

059868210

ABSTRACT:
A zoom lens system having two lens group. The zoom lens system has a zooming ratio greater than 2.4, a viewing angle of over 70 degrees and a telephoto ratio of about 1.0. The zoom lens system includes a first lens group of a positive refractive power, which has four lenses, and a second lens group of a negative refractive power, which has three lenses. The second lens group includes one aspherical lens surface. The zoom lens system according to the present invention satisfies the following conditions:

REFERENCES:
patent: 5398135 (1995-03-01), Ohashi
patent: 5481404 (1996-01-01), Kikushi
patent: 5636061 (1997-06-01), Kang
patent: 5687027 (1997-11-01), Itoh
patent: 5726811 (1998-03-01), Kang

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