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An optical disc reading apparatus and method therefore

A technology for reading equipment and optical discs, which is applied to optical recording/reproducing, modification of reading/writing signals, optical recording heads, etc. Error rate, improve the effect of error correction

Inactive Publication Date: 2009-06-03
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such effects may e.g. occur due to external shocks during operation of the optical disc system, physical defects or due to contamination of the disc

Method used

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  • An optical disc reading apparatus and method therefore
  • An optical disc reading apparatus and method therefore
  • An optical disc reading apparatus and method therefore

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Embodiment Construction

[0040] The following description focuses on embodiments of the invention that may be used in a near-field optical disc reading device. It should be understood, however, that the invention is not limited to this application, but may be used with many other optical disc readers and systems.

[0041] Figure 4 shows an example of an optical disc reading device according to some embodiments of the present invention.

[0042] In this example, an optical disc data reader 401 reads data from an optical disc 403 . The data stored on the optical disc 403 is RLL (run-limited) encoded. In addition, this optical disc data reader is a near-field optical disc reader that reads data from a high-density optical disc 403 . The optical disc data reader 401 notably includes a solid immersion lens (SIL) which is controlled to be placed very close to the disc surface. In this way, the read head comprising the SIL is controlled such that the disc surface is located at a very short distance (the s...

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PUM

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Abstract

The present invention provides an optical disc reading apparatus, such as a Near Filed optical disc reading apparatus, comprises a disc reader (401) which generates a first signal by reading an optical disc (403). A bit detector (407) detects data values in response to the first signal. The detected data is fed to an error correction processor (407) which performs error correction on the stream of detected data. In addition, the reading apparatus comprises an error signal processor (411) which generates a reading head position error signal. The error signal may for example be indicative of an air gap error or a tracking error for the reading lens. The error signal is fed to a reliability processor (413) which sets reliability values of at least some of the detected data in response to the head position error signal. The error correction performed by the error correcting processor (407) then performs the error correction taking the reliability values into account. The invention may allow improved error correction performance.

Description

technical field [0001] The present invention relates to an optical disc reading device and its operating method, especially but not exclusively to a near-field optical disc reading device. Background technique [0002] As evidenced by the popularity of storage disk formats such as compact disk (CD) and digital versatile disk (DVD), optical disk storage has proven to be an efficient, practical and reliable method of data storage and distribution. [0003] Ongoing research is ongoing to find ways to increase the capacity of optical discs, in particular R&D is constantly striving to provide higher data densities, thereby allowing higher capacities for a given size of disc. [0004] One problem in increasing capacity is that the maximum data density that can be recorded on an optical disc in an optical recording system scales inversely with the size of the laser spot focused onto the disc. The spot size is determined by the ratio of two optical parameters: the wavelength λ of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/18G11B20/10G11B7/09G11B7/135
CPCG11B20/1833G11B20/10009G11B7/1387G11B7/0908G11B7/09G11B20/18
Inventor C·A·弗舒伦
Owner KONINKLIJKE PHILIPS ELECTRONICS NV