| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device which properly suppresses aberration even when ambient temperature changes. <P>SOLUTION: A movable lens 15 varying the rate of convergence or divergence of light reaching an objective lens 17 by moving in an optical axis direction has its position adjusted to correspond to ambient temperature. The objective lens 17 is arranged to be tilted with respect to an optical axis of light reaching the objective lens 17 from the movable lens 15. First coma aberration of which the amount produced varies according to movement of the movable lens 15, and second coma aberration of which the amount produced varies due to variation in the warping state of an optical disc 70 that is caused along with variation in ambient temperature both occur in the radius direction of the optical disc 70, and the objective lens 17 has its tilting direction adjusted such that the first coma aberration and the second coma aberration have their increasing and decreasing directions of the amount of coma aberration produced with respect to variation in ambient temperature reversed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
