High aperture objective lens
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United States of America Patent
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-
Jan 7, 2003
Grant Date -
Oct 24, 2002
app pub date -
Aug 15, 2001
filing date -
Feb 21, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A high-aperture objective comprising a first lens L1 with positive refractive power f1 and a second lens L2 with negative refractive power f2, wherein the focal length ratio between the two lenses is in the range of -0.4<(f1/f2)<-0.1 and the total refractive power 1/f1+1/f2 is greater than zero, two positive lenses L3, L4 whose ratio diameter d3, d4 to focal length f3, f4 satisfies the condition greater than 0.3 and less than 0.6:0.3
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