Apparatus for reading from and/or writing to optical recording media
AssigneeDeutsche Thomson-Brandt GmbH
InventorsLieu Kim Dang, Fang Lei
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Abstract
An apparatus for reading from and/or writing to optical recording media on which data markings are arranged along tracks arranged next to one another. The apparatus according to the present invention comprises a light source, a focusing means and an intensity distribution converter. In the present invention, both the extent of the focus spot of the primary beam is reduced and the disadvantages occurring due to the secondary beams are reduced. In an exemplary embodiment, the intensity distribution converter comprises a filtering strip arranged in the region of the focusing means.
Claims11
Apparatus for reading from or writing to optical recording media on which data markings are arranged along tracks arranged next to one another, the apparatus comprising:
- a light source for generating a scanning beam of light;
- a focusing means for focusing the scanning beam onto a track of the recording medium;
- and
- an intensity distribution converter for reducing the spatial extent of the focus spot of the scanning beam, the intensity distribution converter comprising a filtering strip arranged in the region of the focusing means, wherein the filtering strip is arranged at a tilt angle of greater than zero degrees with respect to the direction of the tracks of the recording medium.
Dependencies are inferred from the claim text.