| 摘要 |
PURPOSE:To make a holding frame made of a magnetic material unnecessary by forming as one body an elastic member for holding an objective lens so as to be freely movable in the tracking direction, on an objective lens or a magnetic material, or a permanent magnet. CONSTITUTION:A magnetic material part 12 inserts and forms as one body an objective lens 10 in the tracking direction, namely, to the outside peripheral part of a projecting edge part 11a extended and provided on the outside of the effective diameter of a lens body 11, in cooperation with a permanent magnet provided on the periphery of the objective lens 10, and a tracking driving coil (not shown in the figure). An elastic member 13 is constituted of, for instance, a plate spring, etc., a pair are provided at symmetrical positions centering around the lens body 11 and the optical axis, and one end side of each elastic member 13 is inserted and formed as one body into the projecting edge part 11a of the lens body 11. |
