Zoom lens

Details Zoom lens Zoom lens

1994-06-13

1996-11-05

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359773, G02B 1514

Patent

active

055722776

ABSTRACT:
The invention provides a zoom lens system having a zoom ratio as high as about 8 to 12 but is of wide field angle and small size, and is suitable for use on a video camera, said zoom lens system comprising a positive first lens unit L1 which is movable in an orbit, said orbit displaceable toward objet side at the telephoto end position rather than at the wide-angle end position, a negative second lens unit L2 which is movable in an orbit, said orbit displaceable toward the image side at the telephoto end position rather than at the wide-angle end position, a positive third lens unit L3 which is movable in an orbit, said orbit displaceable toward the object side at the telephoto end position rather than at the wide-angle end, and a positive or negative fourth lens unit L4 which is movable, and conforming to

REFERENCES:
patent: 4634236 (1987-01-01), Masumoto
patent: 5146366 (1992-09-01), Mukaiya
patent: 5313331 (1994-05-01), Mihara

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