Zoom lens system having two lens units

Details Zoom lens system having two lens units Zoom lens system having two lens units

1998-04-07

2000-02-15

Dang, Hung Xuan

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

060259612

ABSTRACT:
A zoom lens system has a first lens unit and a second lens unit from the object side. The first lens unit has a negative optical power. The second lens unit has a positive optical power. The second lens unit is arranged on the image side of the first lens unit. An air space between the first and second units is variable for zooming. The second lens unit has a doublet lens element composed of a positive lens element and a negative lens element cemented together.

REFERENCES:
patent: 4993814 (1991-02-01), Hata
patent: 5283693 (1994-02-01), Kohno et al.
patent: 5663836 (1997-09-01), Ogata

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