Zoom lens

Details Zoom lens Zoom lens

1994-09-12

1996-03-12

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359676, G02B 1514

Patent

active

054991412

ABSTRACT:
The zoom lens of the present invention comprises, in the order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power and a fifth lens group having a negative refractive power, in which, at a refractive power varying operation from the wide angle end to the telescopic end, at least the first and fifth lens groups move toward the object side, while the air gaps between the first and second lens groups and between the second and third lens groups increase and the air gap between the fourth and fifth lens groups decreases, and there is satisfied a condition:

REFERENCES:
patent: 5325233 (1994-06-01), Nakatsuji et al.

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