Optical: systems and elements – Lens – With variable magnification
Patent
1997-02-12
1998-05-05
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359700, 359705, 359823, 359826, 396 76, 396 77, 396 79, 396124, G02B 1514, G02B 1522, G02B 702, G03B 1700
Patent
active
057483876
ABSTRACT:
There is provided a zoom lens of an inner focusing system which is capable of an auto-focusing operation and a manual focusing operation with a high precision.
A zoom lens system in which a movement locus of a focusing lens unit is defined by synthesizing a focus cam and a zoom compensation cam is arranged such that a ratio of an amount of rotation for focusing from infinity to closest to an amount of rotation for zooming from wide angle to telephoto in the focus cam is set within a predetermined range so that, when the sensitivity of a movement of an imaging point with respect to a movement of the focusing lens unit in the direction of the optical axis in the closest in-focus state is larger than that in the infinity in-focus state, the sensitivity of the movement of the imaging point with respect to the movement of the focusing lens unit in the rotational direction satisfies specific conditions.
REFERENCES:
patent: 4841325 (1989-06-01), Hoshino et al.
patent: 4963006 (1990-10-01), Inadome
patent: 5337187 (1994-08-01), Fukino et al.
Epps Georgia Y.
Nikon Corporation
Schwartz Jordan M.
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