An optical disc reading apparatus and method therefore

A technology for reading equipment and optical discs, which is applied to recording/reproducing optical methods, modification of reading/writing signals, optical recording heads, etc. Small error rate, improved bit detection effect

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

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Problems solved by technology

However, such variations in spot size and intersymbol interference may lead to increased detection error rates in PRML detectors

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

[0048] The following description focuses on embodiments of the invention that can be used in a near-field optical disc reading device. However, it will be appreciated that the invention is not limited to this application, but may be used with many other optical disc readers and systems.

[0049] Figure 4 shows an example of an optical disc reading device according to some embodiments of the present invention.

[0050] In this example, an optical disc data reader 401 reads data from an optical disc 403 . Data stored on the optical disc 403 is RLL (Run Length 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. The read head comprising the SIL is thereby controlled such that the disc surface is located at a very short distance (the so ca...

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PUM

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Abstract

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 and data reference signals which are indicative of expected signals for different data sequences. An air gap processor (415) generates a reading head position error signal indicative of a distance between the surface of the optical disc and a reading leans. A reference processor (409) modifies the data reference signals in response to the reading head position error signal. The invention allows improved bit detection and in particular allows fast adaptation of e.g. a Partial Response Maximum Likelihood (PRML) bit detector to variations in an air gap for a reading lens.

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] Continuing 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 so that higher capacities can be achieved 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 waveleng...

Claims

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Application Information

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IPC IPC(8): G11B20/10G11B7/09G11B7/135
CPCG11B20/10009G11B7/0908G11B20/10296G11B7/1387G11B7/09G11B20/10
Inventor C·A·弗舒伦
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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