Zoom lens focusing system and method

Details Zoom lens focusing system and method Zoom lens focusing system and method

1998-07-21

2000-01-11

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359690, 359780, 359784, G02B 1514

Patent

active

060142669

ABSTRACT:
A zoom lens focusing system for and method of focusing from an infinite to a close distance. The system includes a zoom lens comprising a plurality of lens groups each being axially movable to define a plurality of positional states and focal length for each positional state. Each of the plurality of lens groups moves for focusing such that the ratios of movement amounts of the respective lens groups vary as a function of the focal length. The method includes the steps of providing the above-described zoom lens, and then focusing by moving the plurality of lens groups such that the ratios of movement amounts of the respective lens groups vary as a function of the focal length. The focusing system and method each preferably satisfy a number of conditions.

REFERENCES:
patent: 5570234 (1996-10-01), Shibata

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