Small zoom lens system

Details Small zoom lens system Small zoom lens system

1992-04-02

1993-11-09

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

052608344

ABSTRACT:
The present invention relates to a small zoom lens system for electronic still cameras or video cameras, which has a zoom ratio lying in the range of about 2.5-3.2 and an F-number lying in the range of about 2-2.8, comprises as small as 7 or 8 lenses and is reduced in terms of both the total length and the lens diameter, and which is characterized by comprising, in order from the object side, at least a first lens group having a positive refractive power, a second lens group having a negative refractive power, a stop and a third lens group having a positive refractive power, and in that during zooming the first lens group remains fixed while the second and third lens groups are moved along the optical axis, and the following conditions (1) and (2) are satisfied:

REFERENCES:
patent: 4582399 (1986-04-01), Mihara
patent: 4906079 (1990-03-01), Mihara et al.

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