| 摘要 |
An electrodynamic device translates an objective 1 along a path 4 in a radial direction relative to the axis of rotation 2 of an optical disc 3 and comprises a slide 6 on which the objective is arranged and a parallel-guide arrangement along which the slide is movable. It also comprises two stator magnets 7A and 7B, arranged on a stator yoke of a magnetizable material, and two drive coils 8A and 8B which are connected to the slide 6 and which can be translated in the magnetic field of the stator magnets. The slide 6 is movable on two guide rods 8A and 9B of a magnetizable material, which rods provide the parallel guidance of the slide 6 and also serve as parts of the stator yoke, air gaps 12A and 12B being formed between the permanent magnets and the drive coils being arranged around the guide rods. |
