Zoom lens system

Details Zoom lens system Zoom lens system

1997-01-27

1998-06-30

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359700, 359705, 359823, 359826, 396 76, 396 77, 396 79, 396124, G02B 1514, G03B 300, G03B 118

Patent

active

057742766

ABSTRACT:
In a zoom lens system in which the movement locus of a focusing lens unit is defined by synthesizing a focus cam and a zoom compensation cam, and the sensitivity of movement of an image point in association with the movement, in the direction of the optical axis, of the focusing lens unit in infinity and closest in-focus states does not vary so much, the ratio of the amount of rotation for focusing upon focusing from the infinity position to the closest distance position to the amount of rotation for zooming from the wide-angle end to the telephoto end in the focus cam is set to fall within a predetermined range, so that the sensitivity of movement of an image point in association with the movement, in the direction of rotation, of the focusing lens unit satisfies a specific condition.

REFERENCES:
patent: 4841325 (1989-06-01), Hoshino et al.
patent: 4963006 (1990-10-01), Inadome
patent: 5032013 (1991-07-01), Shibayama
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5337187 (1994-08-01), Fukino et al.

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