Zoom lens and photographing apparatus having it
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 14, 2003
Grant Date -
N/A
app pub date -
Jul 26, 2000
filing date -
Jul 28, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom lens has the following lens components in the order named from the object side: a front lens component of a negative optical power, which has a first lens unit of a positive optical power and a second lens unit of a negative optical power in the order named from the object side; and a rear lens component of a positive optical power, which has a third lens unit of a positive optical power and a fourth lens unit of a positive optical power in the order named from the object side. The zoom lens varies a spacing between principal points of the front lens component and rear lens component by varying a spacing between the first lens unit and the second lens unit and a spacing between the third lens unit and the fourth lens unit, in order to effect zooming. The first lens unit and the fourth lens unit change their moving direction midway through zooming from the wide-angle end to the telephoto end.
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