Title:
METHOD AND DEVICE FOR PERFORMING TILT CORRECTION USING MULTI-DIMENSIONAL ACTUATOR
Document Type and Number:
WIPO Patent Application WO2003083850
Kind Code:
A3
Abstract:
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.
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Inventors:
RAAYMAKERS JEROEN A L J (NL)
Application Number:
PCT/IB2003/001395
Publication Date:
December 24, 2003
Filing Date:
April 01, 2003
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
RAAYMAKERS JEROEN A L J (NL)
RAAYMAKERS JEROEN A L J (NL)
International Classes:
G11B7/095; (IPC1-7): G11B7/095
Foreign References:
| US20010021164A1 | 2001-09-13 | |||
| US5627808A | 1997-05-06 |
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