Rear-focus-type zoom lens equipped with index-distribution-type

Details Rear-focus-type zoom lens equipped with index-distribution-type Rear-focus-type zoom lens equipped with index-distribution-type

1992-06-16

1994-06-14

Sugarman, Scott J.

Optical: systems and elements

Lens

With graded refractive index

359684, 359687, G02B 1514

Patent

active

053215524

ABSTRACT:
A zoom lens having four groups and wherein at least one of the four groups is equipped with an index distribution type lens. A first lens group has a positive refracting power; a second group has a negative refracting power; a third lens group has a positive refracting power; and a fourth lens group has a positive refracting power. The first through fourth lens groups are arranged in this order from the object side, and the second group is moved to perform zooming while the fourth lens group is moved to compensate for image plane fluctuation which is incident to the zooming and also to perform focusing.

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