Suspension arm actuator for a scanning device including a magnet for field optimization

A suspension arm actuator for a scanning device, comprising a suspension arm which is designed as a two-arm lever having a first and a second lever arm, is allocated to a disk-shaped data carrier and is mounted to a support between the lever arms such that it can be pivoted about a pivot axis extending perpendicularly in relation to the suspension arm,

• wherein the first lever arm supports a pickup and the second lever arm is provided with a recess to initiate a swivel motion of the suspension arm, and
• wherein an inner leg of a yoke with a U-shaped cross-section is permanently attached to the support and projects into said recess and a first shell-like magnet is arranged on an outer leg of said yoke not projecting into said recess and a second shell-like magnet is arranged on said inner leg of said yoke projecting into said recess, said yoke and said first and second shell-like magnets forming a first magnetic drive together with at least a first printed coil of the suspension arm surrounding said recess, and wherein
• a third magnet for field optimization is arranged on the yoke in the region between the inner leg thereof and the first shell-like magnet and underneath the first printed coil.