Vari-focal lens system

Details Vari-focal lens system Vari-focal lens system

1990-10-25

1992-10-20

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359684, 359653, 359654, 359689, G02B 1514

Patent

active

051575507

ABSTRACT:
A vari-focal lens system comprising, in the order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a positive refractive power and an aperture stop arranged on the image side of said third lens unit, using at least one radial GRIN lens, axial GRIN lens or aspherical surface, and having a high vari-focal ratio and a wide field angle at the wide position.

REFERENCES:
patent: 4687302 (1987-08-01), Ikemori et al.
patent: 4842386 (1989-06-01), Kitagishi et al.

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