Method and device for performing tilt correction using multi-dimensional actuator
First Claim
1. A tilt control device for controlling a radial tilt of a recording surface of an optical disc with respect to an optical recording/reproducing beam, said tilt control device comprising:
- control means for generating two focus controlling outputs; and
actuating means for receiving said two focus controlling outputs for controlling a focusing state and the radial tilt of the optical recording/reproducing beam utilizing said received two focus controlling outputs, wherein said control means determines a radial tilt value based on a differentiation of focus control values obtained at different radii of said optical disk; and
wherein said control means calculates a mean disc tilt value in a tilt register.
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Accused Products
Abstract
In a 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.
13 Citations
13 Claims
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1. A tilt control device for controlling a radial tilt of a recording surface of an optical disc with respect to an optical recording/reproducing beam, said tilt control device comprising:
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control means for generating two focus controlling outputs; and actuating means for receiving said two focus controlling outputs for controlling a focusing state and the radial tilt of the optical recording/reproducing beam utilizing said received two focus controlling outputs, wherein said control means determines a radial tilt value based on a differentiation of focus control values obtained at different radii of said optical disk; and wherein said control means calculates a mean disc tilt value in a tilt register. - View Dependent Claims (2, 3, 4, 5, 7, 8)
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6. A tilt control device for controlling a radial tilt of a recording surface of an optical disc with respect to an optical recording/reproducing beam, said tilt control device comprising:
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control means for generating two focus controlling outputs; and actuating means for controlling a focusing state and the radial tilt of the optical recording/reproducing beam based on said two focus controlling outputs, wherein said control means determines a radial tilt value based on a differentiation of focus control values obtained at different radii of said optical disk, wherein said control means calculates a mean disc tilt value said mean disc tilt value is obtained based on the following equation;
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9. A tilt control device for controlling a radial tilt of a recording surface of an optical disc with respect to an optical recording/reproducing beam, said tilt control device comprising:
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a processor configured to generate two focus control outputs; and an actuator configured to; receive said two focus control outputs; and
control a focusing state and the radial tilt of the optical recording/reproducing beam utilizing said received two focus control outputs, wherein said processor determines a radial tilt value based on a differentiation of focus control values obtained at different radii of said optical disk; andwherein said processor calculates a mean disc tilt value in a tilt register. - View Dependent Claims (10, 11, 12, 13)
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Specification