| 摘要 |
PROBLEM TO BE SOLVED: To reduce the physical size of a moving part and further to remove redundant members. SOLUTION: Laminated ferrite/coil part 30 is formed by a printed lamination method, and is manufactured by repeatedly printing non-magnetic body and insulating alumina 32 and Ag composing a coil 33 on a substrate of a magnetic ferrite 31 by means of a thick film printing method, for example, with a thickness of severalμm, and then drying it. A focus coil 33 is arranged to cross a magnetic pathΦcoming out of a magnet 22F and a magnetic ferrite 31, and when a focus driving current is impressed across both ends of the focus coil 33 from a focus servo circuit of the optical disk device side, a driving force Ff (Lorentz's force) for focus f is generated, and a moving element 10a is moved by this driving force Ff in the direction of the optical axis of the objective lens 11.
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