Optical: systems and elements – Lens – With variable magnification
Patent
1996-11-26
1998-06-02
Font, Frank G.
Optical: systems and elements
Lens
With variable magnification
359694, 359676, G02B 1514
Patent
active
057609713
ABSTRACT:
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 so as to achieve an in-focus state by a substantially constant amount of rotation for an identical object distance independently of a zooming state. In zooming, an amount of movement of the focusing lens unit is defined by a combination of the focus cam and the zoom compensation cam. An amount of movement of a non-focusing lens unit is defined by a combination of a zoom cam and the zoom compensation cam. In focusing, the amount of movement of the focusing lens unit is defined by the focus cam. The zoom lens system satisfies specified formulas so that the number of data of specific coefficients required for auto-focusing can be reduced, and an error upon calculation of the lens driving amount of the focusing lens unit using stored specific coefficients in correspondence with a detected defocus amount can be reduced.
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patent: 4841325 (1989-06-01), Hoshino et al.
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patent: 5032013 (1991-07-01), Shibayama
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5337187 (1994-08-01), Fukino et al.
Font Frank G.
Nikon Corporation
Stafira Michael P.
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