Zoom lens

Details Zoom lens Zoom lens

1993-07-20

1995-01-17

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359380, 359684, G02B 1514

Patent

active

053830580

ABSTRACT:
A zoom lens of a four-group structure comprises the following sequentially from the object side, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power and a fourth lens group having positive refracting power. When a variable power takes place from the wide angle end to the telescopic end, at least the second lens group is driven along the optical axis relatively so that the distance between-the first lens group and second lens group is increased and at the same time, the fourth lens group is driven toward the image side.

REFERENCES:
patent: 5009492 (1991-04-01), Hamano
patent: 5138492 (1992-08-01), Hamano et al.

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