Zoom lens system with gradient index lens

Details Zoom lens system with gradient index lens Zoom lens system with gradient index lens

1994-12-20

1996-11-26

Epps, Georgia Y.

Optical: systems and elements

Lens

With graded refractive index

359775, 359688, G02B 900

Patent

active

055791689

ABSTRACT:
A zoom lens system comprises in the following order from the object side: a first lens group of a positive refracting power; a second lens group of a negative refracting power; a third lens group; and a fourth lens group of a positive refracting power, wherein, when changing a focal length of the zoom lens system from a wide-angle end to a telephoto end, the second lens group is shifted in one direction along an optical axis of the zoom lens from the object side toward the image side, the third lens group is shifted so as to reciprocate along the optical axis, and the first lens group has a gradient index lens whose refractive index varies along the direction of the optical axis and which satisfies the following condition:

REFERENCES:
patent: 5054898 (1991-10-01), Kitagishi et al.

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