Zoom lens system

Details Zoom lens system Zoom lens system

1989-05-30

1991-12-03

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359791, G02B 1500

Patent

active

050695363

ABSTRACT:
A zoom lens system comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having positive refractive power and a third lens unit having negative refractive power, and so adapted as to vary focal length from the wide position to the tele position by displacing the first lens unit integrally with the third lens unit toward the object side and displacing the second lens unit toward the object side at a speed slower than that of the first lens unit, said zoom lens system having such a composition as to permit simplifying structure of the driving mechanism for varying focal length, a compact design and favorable performance.

REFERENCES:
patent: 4673258 (1987-06-01), Masumoto
patent: 4773744 (1988-09-01), Yamanashi
patent: 4854682 (1989-08-01), Yamanashi

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