| 摘要 |
PROBLEM TO BE SOLVED: To enable sliding smoothly a sleeve part of a lens holder to a supporting shaft of a base and to hold stably attitude of a lens holder. SOLUTION: This apparatus is provided with a base 11 in which a supporting shaft 13 is provided in parallel to an optical axis of an objective lens 3, a lens holder 12 having a sleeve part 16 in which the supporting shaft 13 is inserted through, holding the objective lens 3 at one end side, and being able to slide in the direction of tracking and focusing, magnets 15a, 15b, and a drive part having first to fourth tracking coils 18a-18d for rotating a focusing coil 17 and the lens holder 12 in the direction of tracking for driving the lens holder 12 arranged in the magnetic field generated by this magnets 15a, 15b in the direction of focusing, and a ring 24 arranged around the sleeve part 16 so as to be parallel to the base 11 and in which a permeability expanding part 25 is provided at one part. COPYRIGHT: (C)2006,JPO&NCIPI
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