Variable focal length optical system

Details Variable focal length optical system Variable focal length optical system

1996-09-06

1997-05-13

Adams, Russell E.

Photography

Having variable focal length of camera objective

359676, G03B 1700

Patent

active

056301812

ABSTRACT:
A variable focal length optical system includes a first lens unit (G1) having a positive refractive power and arranged to be closest to an object, a final lens unit (Gb) having a negative refractive power and arranged to be closest to an image, the first lens unit (G1) and the final lens unit (Gb) moving to the object side when a focal length of an entire lens system changes from a smallest focal length state to a largest focal length state, and an aperture stop arranged on an image side of the first lens unit (G1) and on an object side of the final lens unit (Gb), wherein the variable focal length optical system satisfies the following conditions:

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patent: 5113287 (1992-05-01), Nakayama
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patent: 5499141 (1996-03-01), Ohtake
patent: 5585969 (1996-12-01), Endo

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