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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: 2011-08-10
KONINK 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 present invention that can be used in near-field optical disc reading devices. However, it should be understood that the present invention is not limited to this application, but can be used in many other optical disc readers and systems.

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

[0042] In this example, the optical disc data reader 401 reads data from the optical disc 403. The data stored on the optical disc 403 is RLL (Limited Run Length) coded. In addition, the optical disc data reader is a near-field optical disc reader that reads data from the high-density optical disc 403. The optical disc data reader 401 particularly includes a solid immersion lens (SIL) that is controlled to be placed very close to the surface of the disc. In this way, the read head including the SIL is controlled, with the result that the disc surface is...

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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 anair 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 thehead 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 an operating method thereof, and particularly but not exclusively to a near-field optical disc reading device. Background technique [0002] As shown by the popularity of storage disc formats such as compact disc (CD) and digital versatile disc (DVD), optical disc storage has proven to be an effective, practical, and reliable method of data storage and distribution. [0003] Continuous research is underway to find ways to increase the capacity of optical discs. In particular, research and development are constantly striving to provide higher data density, thereby allowing a given size of disc to have a higher capacity. [0004] One problem in increasing the capacity is that the maximum data density that can be recorded on the optical disc in the optical recording system increases or decreases inversely with the size of the laser spot focused on the disc. The spot size is determined by the rati...

Claims

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Application Information

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