Method and device for performing tilt correction using multi-dimensional actuator

摘要

The present invention relates to method and device for performing tilt control. A focus and a tilt controlling output is generated, and a focusing and tilt state of an optical recording/reproducing beam is controlled by determining a radial tilt value based on a differentiation of focus control values obtained at different radii of said optical disk ( 1 ). The combination of e.g. a 3D actuator with the dz/dr tilt measurement provides the advantage that focus and tilt adjustment can be performed in the same element. Thereby, influences or measurement variations caused by environmental conditions and/or circuit characteristics can be minimized to reduce compensations requirements. Furthermore, a 3D actuator ( 11 ) with a split coil arrangement may be used to provide a three-dimensional focus adjustment. Thereby, the 3D actuator ( 11 ) can be used for feed forward tilt compensation without offset or gain errors and without any additional sensor.