Zoom lens
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United States of America Patent
Stats
-
Oct 7, 1997
Grant Date -
N/A
app pub date -
Sep 13, 1995
filing date -
Dec 25, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom lens includes at least two lens groups, i.e., a first lens group and a second lens group. The second lens group includes a first sub-group near to the first lens group and a second sub-group far from the first lens group, and the first lens group and the first sub-group in the second lens group together form a substantially afocal system in at least a portion of a zooming range. In the zoom lens, focusing is effected by the first sub-group in the second lens group being moved along the optical axis. Considering a case where this zoom lens is applied for auto focusing, it is preferable that the first lens group be disposed on that side in the lens group which is most adjacent to the object side.
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Cited Art Landscape
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