| 摘要 |
PURPOSE:To make a device small in size by constituting a coil for tracking with a flexible printed circuit and using it as a bobbin of a coil for focusing to reduce the total thickness of the coil and the bobbin which are inserted to a magnetic gap. CONSTITUTION:A bobbin 7 consists of a flexible printed board where coil patterns 70 for tracking are formed on both faces, and a focusing coil 11 is wound around the bobbin 7. A lens 8 is moved in the direction of an arrow A together with a lens driving plate 4 when a current is flowed to the focusing coil 11, and the lens driving plate 4 is rotated around a shaft 5 to move the lens 8 in the direction of an arrow B when a current is flowed to coil patterns 70 for tracking. Since the total thickness of the coil 11 and the bobbin 7 inserted to the magnetic gap is reduced, the magnetic gap can be made narrower, and the device is made small in size, and the magnetic flux density in the gap part is raised, and the power efficiency of an actuator is improved. |
