| 摘要 |
The present invention relates to an objective lens, an optical pickup, and an optical information processing apparatus. Although coma aberration of approximately 0.22 lambda rms, 0.14 lambda rms, and 0.09 lambda rms is generated in a case where blue type, DVD type, and CD type media is tilted 1 degree, respectively, the coma aberration from medium tilt can be corrected by lens tilt by using an objective lens satisfying the conditions of |CLx/CDx|>=1, wherein CDx (x=1,2,3) is the value of each least square error (unit: lambda rms) of the third order coma aberration components generated per angle when the substrates of the medium is tilted, wherein CLx (x=1,2,3) is the value of each least square error (unit: lambda rms) of the third order coma aberration components generated per angle when the objective lens is tilted during the converging and irradiating to the medium.
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