Small-sized zoom lens

Details Small-sized zoom lens Small-sized zoom lens

1994-09-01

1996-02-20

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

054934478

ABSTRACT:
The purpose of the present invention is to provide a zoom lens capable of reducing the whole length of the zoom lens in a telescopic end and effective diameters of front lenses thereof, decreasing the number of lenses thereof to enable miniaturization of the zoom lens, and obtaining great zoom ratio. The zoom lens of the present invention has, in the following order from the object side, a first lens group G1 with a positive refractive power, a second lens group G2 with a negative refractive power, a third lens group G3 with a positive refractive power and a fourth lens group G4 with a negative refractive power wherein in a refractive power varying operation from a wide-angle end to a telescopic end, the first lens group G1 and the fourth lens group G4 are moved to the object side, the distance of an air space between the first lens group G1 and the second lens group G2 is increased and the distance of an air space between the third lens group G3 and the fourth lens group G4 is decreased, the following condition is satisfied:

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