Actuator for an optical scanning device
View Patent ↗Actuator for an optical scanning device, having a focus lens mounted in a lens holder and having a damper base firmly connected to a mount, having a magnet arrangement arranged on the mount, and a coil arrangement interacting with the magnet arrangement, on a printed circuit board, for fine positioning of the focus lens, with the printed circuit board being connected to the damper base by means of elastically flexible suspension means arranged on both sides of the longitudinal axis of the actuator. It achieves the object of designing an actuator such as this in such a way that it has a reduced moment of inertia, because of a reduced mass. For this purpose, the printed circuit board is at the same time a mounting board for the lens holder, and the printed circuit board and the lens holder together form the moving part of the actuator.
1. An actuator for an optical scanning device, having a focus lens mounted in a lens holder and having a damper base which is firmly connected to a mount, having a magnet arrangement arranged on the mount, and having a coil arrangement interacting with the magnet arrangement, on a printed circuit board for fine positioning of the focus lens, with the printed circuit board being connected to the damper base by means of elastically flexible suspension means which are arranged on both sides of the longitudinal axis of the actuator, the printed circuit board being at the same time a mounting board for the lens holder, and the printed circuit board and the lens holder together forming the moving part of the actuator, wherein the magnet arrangement consists of a first partial magnet arrangement and a second partial magnet arrangement arranged so as to leave an area between them, and the lens is arranged in the area.
2. The actuator of claim 1 , wherein the printed circuit board is arranged transversely with respect to the longitudinal axis of the actuator and is firmly connected, in particular soldered, to the suspension means.
3. The actuator of claim 1 , wherein the actuator is symmetrical and the focus lens is arranged at the front end of the actuator.
4. The actuator of claim 1 , wherein a compensating mass is connected to the printed circuit board on the side of the printed circuit board facing away from the focus lens.
5. The actuator of claim 4 , wherein the compensating mass is integrally formed on the lens holder.
6. The actuator of claim 1 , wherein three suspension wires each, arranged at a distance one above the other, are used as suspension means.
7. The actuator of claim 1 , wherein the magnet arrangement has four permanent magnets, which are attached to a yoke firmly connected to the mount.
8. The actuator of claim 1 , wherein two permanent magnets are arranged on that side of the printed circuit board which faces the damper base, and two permanent magnets are arranged on tat side of the printed circuit board which faces away from the damper base.
9. The actuator of claim 1 , wherein the actuator together with an optical housing forms a scanning device which is moved along its longitudinal axis.
10. An appliance for reading from or for writing to, or for reading from and writing to, optical storage media, having an actuator according to claim 1 , and a scanning device formed with the actuator.