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Information recording medium, information recording/reproducing apparatus and information reproducing method

A technology for information recording and media, applied in optical recording/reproducing/erasing methods, recording/reproducing by optical methods, recording signal processing, etc., and can solve problems such as tracking error and data reliability reduction

Inactive Publication Date: 2005-03-09
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when recording data, or when playing back data recorded on an optical disc on which mark pits have been recorded by an information recording / reproducing apparatus, the following problems can occur: for example, tracking occurs by jumping to adjacent tracks. Errors and reduced data reliability due to crosstalk from adjacent tracks
These are serious problems, especially in optical discs with high recording density and narrow track pitch

Method used

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  • Information recording medium, information recording/reproducing apparatus and information reproducing method
  • Information recording medium, information recording/reproducing apparatus and information reproducing method
  • Information recording medium, information recording/reproducing apparatus and information reproducing method

Examples

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Embodiment Construction

[0066] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. In these embodiments, a DVD is taken and described as an example of an information recording medium, but it should be understood that the present invention is not limited to these embodiments.

[0067]

[0068] figure 1 Displays the entire structure of the master device. The master device 100 is used to make a master disk DS, and has: a recording unit 2 ; a spindle motor 3 for rotating the master disk DS; and a servo unit 4 . For example, the master DS is a glass master on which a light-blocking material is applied. The recording section 2 has: a laser diode for emitting laser light; an optical system for focusing the laser light on the master disk DS; and a slider for radially moving the laser diode and the optical system integrally on the master disk DS. The laser diode emits laser light at a power corresponding to the driving signal supplied from the d...

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PUM

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Abstract

An optical disc (1) has a spiral standard locus. A groove (G) is formed as wobble which meanders or wobbles along the standard locus. The wobble is determined from a wobble signal (WB). The wobble signal is modulated such that a DC offset of the wobble signal is cancelled by a symbol unit of predetermined data, Therefore, in tracking servo upon reproducing, the position of an optical pickup (202) can be converged onto the amplitude center of the wobble in a short time.

Description

technical field [0001] The present invention relates to an information recording medium on which information is recorded by using grooves, an information recording / reproducing apparatus and an information reproducing method. Background technique [0002] In optical discs typified by CD-R (Compact Disc Recordable) and DVD-R (DVD Recordable), information for a recording operation of a recording device is recorded in advance, which modulates a groove to thereby record information. However, in order to improve SN (Signal to Noise Ratio) after recording and / or to hide and record (i) the copy control key for preventing illegal copying and (ii) cancellation information, it is required to reserve another key for encryption in addition to the recording area. Recording area for keys and cancellation information. [0003] A known technique is to record information by wobbling the position of a groove in the radial direction of an optical disc and performing spread spectrum on the wobb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/14G11B7/004G11B7/005G11B7/007G11B7/09G11B20/00
CPCG11B20/00086G11B7/094G11B7/0053G11B7/0901G11B20/00601G11B7/24082
Inventor 黑田和男今村晃
Owner PIONEER CORP
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