Zoom lens system and a focusing method thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 11, 2004
Grant Date -
Feb 7, 2002
app pub date -
Jun 22, 2001
filing date -
Jun 23, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A zoom lens system includes a positive first lens group, a positive second lens group, and a negative third lens group. Upon zooming from the short toward the long focal length extremities, the three lens groups are moved independently along the optical axis so that the distance between the first and second lens groups increases, and the distance between the second and third lens groups decreases. The first lens group and the second lens group which are independently moved upon zooming are integrally moved upon focusing.
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