Compact wide-angle zoom lens system

Details Compact wide-angle zoom lens system Compact wide-angle zoom lens system

1997-09-02

1999-05-04

Mai, Huy

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

059009918

ABSTRACT:
The invention comprises a zoom lens system including two lens groups. The first lens group has an overall positive refractive power, and includes three sub-group lens units. The first sub-group lens unit has a negative refractive power, the second sub-group lens unit has a positive refractive power, and the third sub-group lens unit has a positive refractive power. The second lens group has an overall negative refractive power and includes two sub-group lens units. The fourth sub-group lens unit has a positive refractive power, and the fifth sub-group lens unit has a negative refractive power. The magnification of the system can be changed by varying a distance between the first lens group and the second lens group, wherein the following conditions are satisfied:

REFERENCES:
patent: 4936661 (1990-06-01), Betensky et al.
patent: 5412508 (1995-05-01), Lin

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