| 摘要 |
PROBLEM TO BE SOLVED: To make an optical pickup device thin by arranging a convergent means convergingly irradiating an optical recording medium with an emission beam from a light emission part between an optical part and an optical path change means. SOLUTION: A prism 12 is arranged between a lens 11 and a disk 20, and the drive of the lens 11 in the focal direction F by a biaxial actuator part 15 using an electromagnetic conversion effect is made to the left/right directions for precisely focusing even when the disk 20 is shifted within the range from the highest position 20U to the lowest position 20L due to the warpage of the disk 20. The drive in the tracking direction T by the biaxial actuator part 15 becomes optimum since the height of the lens 11 in the vertical direction T1 does not change. A return beam reflected by the disk 20 is reflected by a prism 12 through a route similar to the emission beam, goes to an optical part 13 through the lens 11 and is made incident on a light receiving part in the optical part 13 to be signal-processed. |
