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Optical scanning device

An optical scanning device, optical recording technology, applied in optics, optical components, recording/reproducing by optical methods, etc., can solve problems such as data error introduction, and achieve the effects of fast switching time, cheap structure, and low power consumption

Inactive Publication Date: 2008-12-03
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These aberrations can lead to the introduction of data errors into the data signal carried by the radiation beam

Method used

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  • Optical scanning device
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Examples

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Embodiment Construction

[0029] figure 1 and 3 The optical element 1 is shown schematically. Further details of the optical element 1 are incorporated here by reference to International Patent Application WO 2004 / 051323.

[0030] refer to figure 1 , optical element 1 has a figure 1 The radiation beam shown by the middle radiation line 3 travels in order to enter the input radiation beam path 2 of the optical element 1 . A radiation beam is emitted by a radiation source 4, such as a laser. The optical element 1 comprises a plurality of electrodes comprising a structure of a first group 97 of segmented electrodes arranged around an extended form 5 of an input radiation beam path 2 such as figure 1 The shown extends straight through the optical element 1 .

[0031] figure 2 Shown is a cross-section of the structure of a first set of 97 electrodes seen from one end of said electrodes, taken perpendicular to the extended input radiation beam path 5 and adapted to produce an anamorphic meniscus shap...

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Abstract

An optical scanning device for scanning an optical record carrier. The optical scanning device includes: a radiation source system (661; 761); an optical element (1; 101; 201; 301) comprising a first fluid (A) and a second fluid (B; C) separated from each other by a fluid meniscus (16; 116, 138; 216; 316) having an adjustable configuration; and a control system (20; 120; 220; 320) arranged to adjust the fluid meniscus configuration to introduce a first type of wavefront modification. The first type of wavefront modification causes the radiation beam to be redirected from an input radiation beam path (2; 102; 244; 348) onto one of a plurality of output radiation beam paths (24, 26; 140; 246; 350) which each have a different angular displacement (alpha, beta, gamma, delta, epsilon) from the input radiation beam path. The control system is further arranged to adjust the fluid meniscus configuration to introduce a second type of wavefront modification. The second type of wavefront modification is arranged to compensate a wavefront aberration of the radiation beam, the compensated wavefront aberration being adjusted in accordance with the angular displacement.

Description

technical field [0001] The invention relates to an optical scanning device for scanning an optical record carrier, in particular for scanning a holographic optical record carrier. Background technique [0002] An apparatus for reading data from and writing data to an optical record carrier such as a compact disc (CD), digital versatile disc (DVD) or a holographic optical record carrier generally comprises a components of the radiation beam. Such manipulation may involve, for example, changing the direction of the radiation beam. [0003] It is important that the data is read or written on the carrier as precisely as possible to avoid errors in the data. Typically, when scanning an optical record carrier, aberrations such as spherical aberration are introduced into the radiation beam by equipment components or by parts of the optical record carrier itself. These aberrations can lead to the introduction of data errors into the data signal carried by the radiation beam. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/02G11B7/0065G02B3/12
CPCG02B26/005G11B7/1392G11B7/0065G02B3/14G02B3/12
Inventor G·特胡夫特F·舒尔曼斯B·亨德里克斯M·梅弗塔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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