High numerical aperture objective lens assembly
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United States of America Patent
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May 14, 2002
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N/A
app pub date -
Jan 12, 2001
filing date -
Jan 12, 2001
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Abstract
A high numerical aperture objective lens assembly for focusing light includes a first objective lens assembly element of negative optical power intercepting said light; a second objective lens assembly element of positive optical power disposed adjacent to said first objective lens assembly element; a third objective lens assembly element of positive optical power disposed adjacent to said second objective lens assembly element; and wherein said first, second, and third objective lens assembly elements, in combination, include six surfaces wherein three or more of such surfaces are aspheric surfaces arranged so that the objective lens assembly has a numerical aperture equal to or greater than 0.65.
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