| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an objective optical element for an optical pick-up apparatus by which coma aberration can be corrected with good balance, and the recording or reproducing of the information can be adequately conducted onto the different optical information recording media, and to provide the optical pick-up apparatus and the optical information recording reproducing apparatus. <P>SOLUTION: When the sine condition is perfectly corrected when a DVD is used, in the sine condition when a CD is used, the dislocation amount from the constant value is large, and as the result, the outside-axis coma aberration becomes large. When the sine condition unsatisfied amount in such a case is defined as SC=h<SB>1</SB>/sinU-f, when the sine condition unsatisfied amount at the height h<SB>1</SB>of the ray of light in the effective diameter, is designed by respectively being distributed when the DVD and the CD are used, as the result, the outside-axis coma aberration when both disks are used, can be balanced. <P>COPYRIGHT: (C)2009,JPO&INPIT |
