Zoom lens system

Details Zoom lens system Zoom lens system

1988-05-19

1990-03-06

Arnold, Bruce Y.

G02B 1514

Patent

active

049060791

ABSTRACT:
A light-weight zoom lens system manufacturable at a low cost comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power and a fourth lens unit having positive refractive power, and adapted in such a manner that said first lens unit and said fourth lens unit are fixed at the zooming time, whereas said second lens unit and said third lens unit are shifted along the optical axis while varying the airspace reserved therebetween. Said second lens unit comprises one or two lens elements and said third lens unit comprises a single lens element, whereby said zoom lens system comprises a small number of lens elements.

REFERENCES:
patent: 4525036 (1985-06-01), Fujibayashi et al.
patent: 4776679 (1988-10-01), Kitagishi et al.

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