Zoom lens system

Details Zoom lens system Zoom lens system

1996-09-18

1998-05-12

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359700, 359705, 359823, 359826, 396 77, 396 79, 396 82, G02B 1514, G02B 702, G03B 300

Patent

active

057514992

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, when 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 a closest in-focus state is larger than that in an infinity in-focus state, 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: 4690537 (1987-09-01), Ando
patent: 4841325 (1989-06-01), Hoshino
patent: 4963006 (1990-10-01), Inadome
patent: 5032013 (1991-07-01), Shibayama
patent: 5075709 (1991-12-01), Ueyama
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5337187 (1994-08-01), Fukino

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