Projection zoom lens system and projector
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jul 1, 2003
Grant Date -
Feb 14, 2002
app pub date -
Apr 26, 2001
filing date -
Apr 27, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A projection zoom lens system according to the present invention has a substantially telecentric incidence side and comprises a plurality of lens groups for behaving differently between a wide-angle end and a telephoto end, wherein at least one of two surfaces of a lens included in a first lens group located closest to a screen side has an aspheric surface. Since the lens closest to the screen has the largest diameter and the density of light rays becomes smallest among the lenses, it is possible to design the aspheric surface for correcting properly the light rays and reduce the correcting loads of the other lens groups constituting the projection zoom lens system so as to provide the compact and high performance zoom lens system.
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