Zoom lens system

Details Zoom lens system Zoom lens system

1991-10-25

1993-06-08

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359687, 359689, G02B 1514

Patent

active

052184765

ABSTRACT:
A zoom lens system for use with a compact camera includes, in order from the object side, a first lens unit having a positive focal length, a second lens unit having a positive focal length and including a positive plastic lens, and a third lens unit having a negative focal length. When zooming is carried out from a wide-angle end to a narrow-angle end, the first, second and third lens units are all moved towards the object in such a manner that a distance between the first and second lens units increases whereas a distance between the second and third lens units decreases. Proper positioning of the positive plastic lens and meeting certain conditions improves the characteristics of the lens system.

REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4701033 (1987-10-01), Masumoto
patent: 4773744 (1988-09-01), Yamanashi
patent: 4840467 (1989-06-01), Takada et al.
patent: 4854683 (1989-08-01), Yamanashi
patent: 5033832 (1991-07-01), Ito

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