Zoom lens system
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
Jan 27, 1997
filing date -
Feb 7, 1996
priority date (Note) -
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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.
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