Zoom lens
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United States of America Patent
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-
Jan 16, 2001
Grant Date -
N/A
app pub date -
Aug 11, 1999
filing date -
Aug 11, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved zoom lens constitutes a plurality of lens groups of different focal length. Through adjusting the position of the lens groups, different zooming ratio may be obtained. Higher image resolution and lower cost may also be achieved through using different lens material. The lens groups have respectively focal length combination of positive, negative, positive and positive. The second and fourth lens groups are movable for obtaining high quality image.
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Cited Art Landscape
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