| 摘要 |
The invention relates to a suspension arm actuator for a scanning device, comprising a suspension arm which is designed as a two-arm lever, is allocated to a disk-shaped data carrier and is mounted to a support such that it can be pivoted about a pivot axis extending perpendicularly in relation to the suspension arm. At one end of a lever arm, the suspension arm supports a sensor and, on the other lever arm, comprises a component (focus coil 5) for a magnetic drive initiating a focusing motion of the sensor perpendicular in relation to the data carrier. The component is arranged at a recess having the shape of a circular arc, with the inner leg of a yoke that is permanently attached to the support projecting into said recess and forming a magnetic yoke, wherein said yoke is provided with a shell-like magnet on its outer leg in order to form the magnetic drive. According to the invention, a magnet for field optimization, which is magnetized perpendicularly in relation to the shell-like magnet, is arranged on the yoke in the region between the inner leg thereof and the shell-like magnet and underneath the focus coil, this being intended to increase the sensitivity of the suspension arm actuator.
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