Zoom lens system

Details Zoom lens system Zoom lens system

1994-07-05

1996-11-26

Hindi, Nabil Z.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514

Patent

active

055791727

ABSTRACT:
A zoom lens system comprises, in an order from an object side, a first lens group with a positive refractive power; a second lens group with a negative refractive power; a third lens group with a negative refractive power; and a fourth lens group with a positive refractive power, wherein, for varying a focal length from a wide-end to a telephoto-end, the second lens group is moved from an object side to an image side along an optical axis and the third lens group is moved to reciprocate on the optical axis, the second lens group having an aspherical lens surface, and the aspherical lens surface is formed in a shape where the positive refractive power gradually increases or in a shape where the negative refractive power gradually decreases from the optical axis toward a periphery.

REFERENCES:
patent: 4572620 (1986-02-01), Kikuchi
patent: 4749267 (1988-06-01), Mihara
patent: 4871239 (1989-10-01), Masumoto et al.

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