| 摘要 |
PURPOSE:To decrease the number of parts and to obtain a small-sized constitution, by providing a couple of coils which slant reversely to each other in such a way that components of force are generated in the driving direction of an actuator in a plane prependicular to the optical axis of an objective lens and also in a plane containing the objective lens optical axis. CONSTITUTION:A controller is provided with a couple of coils 3 which slant reversely to each other in such a way that components of force are generated in the driving direction of the actuator 1 for driving the actuator 1 in a plane prependicular to the objective lens axis and also in a plane containing the objective lens optical axis. Consequently, the driving magnetic field for said coils can be used in common as a driving coil magnetic field in the optical-axis direction, so only one magnet 4 and one yoke material 5 are used to establishing the magnetic field. Thus, the number of parts is decreased while size reduction is facilitated. |
