Optical information recording/reproducing apparatus and objective optical system for the same
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United States of America Patent
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Apr 15, 2014
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N/A
app pub date -
Jul 30, 2013
filing date -
Mar 19, 2010
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Abstract
An objective optical system for information recording/reproducing, at least one of optical surfaces of the objective optical system comprising a diffraction surface including a first region contributing to converging first, second and third beams and including a diffraction structure formed such that use diffraction orders for the first, second and third beams are 1st-orders and a condition 0.03<(λB11−λ1)/λ1<0.40 is satisfied; a second region contributing to converging only the first and second beams and including a diffraction structure formed such that the use diffraction orders are 1st-orders and a condition: −0.35<(λB12−λB11)/λ1<0.35 is satisfied; and a third region contributing to converging only the first beam and including a diffraction structure formed such that the use diffraction order for the first beam is an odd order and a condition: −0.23
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