Zoom lens

Details Zoom lens Zoom lens

1992-08-28

1994-11-15

Sikes, William L.

Optical: systems and elements

Lens

With variable magnification

359715, G02B 1514

Patent

active

053653769

ABSTRACT:
A zoom lens is disclosed, having, in order from the object side, a negative first lens unit, a negative or positive second lens unit, a positive or negative third lens unit and a fourth lens unit. The second and third lens units have refractive powers of opposite sign to each other. When zooming from the wide-angle side to the telephoto side, the first to fourth lens units move toward the object side, while simultaneously varying their lens separations.

REFERENCES:
patent: 4756609 (1988-07-01), Estelle

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