Zoom lens system

Details Zoom lens system Zoom lens system

1990-09-18

1992-07-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359654, G02B 1514

Patent

active

051288052

ABSTRACT:
A zoom lens system comprising a plural number of lens units, so adapted as to perform variation of focal length by varying airspace reserved between each pair of the lens units and comprising, in a negative lens unit arranged in a vari-focal lens group, at least one radial GRIN lens component having a concave shape and refractive index lowered as the lens portions are farther from the optical axis toward the outer circumference in the direction perpendicular to the optical axis.

REFERENCES:
patent: 4776679 (1988-10-01), Kitagishi et al.
patent: 4830476 (1989-05-01), Aoki
patent: 4842386 (1989-06-01), Kitagishi et al.
patent: 4859040 (1989-08-01), Kitagishi et al.

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