Projection lens system having variable magnification
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United States of America Patent
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Aug 25, 2015
Grant Date -
Jul 25, 2013
app pub date -
Jan 23, 2013
filing date -
Jan 23, 2012
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Abstract
A projection lens system is constructed as a zoom lens system which is for use with a laser light source and performs magnification variation by moving at least a lens group along the optical axis, and the projection lens system fulfills the following conditional formula: (|AC(B2−G)|+|AC(R2−G)|)/(|AC(B1−G)|+|AC(R1−G)|)<0.8, where AC(B2−G) represents longitudinal chromatic aberration between the wavelengths λB2 and λG; AC(R2−G) represents longitudinal chromatic aberration between the wavelengths λR2 and λG; AC(B1−G) represents longitudinal chromatic aberration between the wavelengths λB1 and λG; and AC(R1−G) represents longitudinal chromatic aberration between the wavelengths λR1 and λG.
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