Zoom lens system

Details Zoom lens system Zoom lens system

1991-01-31

1992-06-02

Gonzalez, Frank

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1500

Patent

active

051192373

ABSTRACT:
A zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power and a fourth lens unit having a weak refractive power, adapted so as to perform variation of focal length by displacing the second lens unit and the third lens unit in the directions reverse to each other along the optical axis with the first lens unit and the fourth lens unit kept fixed, and having a favorable optical performance and a total length shortened by using a small front lens component.

REFERENCES:
patent: 4256381 (1981-03-01), Kreitzer
patent: 4571033 (1986-02-01), Kato et al.
patent: 4763998 (1988-08-01), Tsuji et al.

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