Information recording medium, information reading apparatus and information recording apparatus

a technology of information recording and reading apparatus, applied in the field of information recording medium, information reading apparatus and information recording apparatus, can solve the problems of wobble signal crosstalk, signal cn degrade, reference signal extracted from wobble signal becomes inaccurate,

Inactive Publication Date: 2003-04-10
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hence, the wobble signal has a degraded CN (Carrier to Noise ratio), a problem occurs on reading of address information recorded by FM modulation and so on, and the reference signal extracted from the wobble signal becomes inaccurate.
Further, in the case of a multilayer disk as well, the same problem results from crosstalk of...

Method used

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  • Information recording medium, information reading apparatus and information recording apparatus
  • Information recording medium, information reading apparatus and information recording apparatus
  • Information recording medium, information reading apparatus and information recording apparatus

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second embodiment

[0138] (Second Embodiment)

[0139] Next, referring to FIGS. 6 to 9, the following will discuss a second embodiment of an information recording medium according to the present invention.

[0140] A signal format of this embodiment is almost the same as that of the first embodiment shown in FIG. 1. However, the synchronizing signal and substantial data except the marker are randomized based on a predetermined random signal, and are each recorded as variation of the positions of pits in the circumferential direction (the direction of a pit reading) of a disk, that is, in the circumferential direction of the disk against a track formed in a spiral fashion. For example, when a pit is positioned forward in the direction of the pit reading (the advance side in time-axis), a mark "0" is assigned. When a pit is positioned backward in the direction of the pit reading (the delay side in time-axis), a mark "1" is assigned.

[0141] In the embodiment, any one of a lead-in area, a lead-out area and a dat...

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Abstract

In an information recording medium, positions of pits are modulated in a direction intersecting a direction of reading of pits, so that a predetermined information is recorded. In this information recording medium, the whole of the predetermined information or a part of the predetermined information is randomized through the used of spread spectrum.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to an information recording medium in which information is recorded as recording marks such as pits.[0003] 2. Description of the Related Art[0004] Currently, an optical disk typified by a CD and a DVD has been put into practice. In the optical disk, information is recorded as the length of pits. However, there is the desire to reserve different recording space without reducing recording space for pits, for example, in order to record information for copy control for the sake of inhibiting illegal copy, etc.[0005] A proposal to vary positions of pits in the radius direction of the optical disk is presented as a method of increasing recording space by a means except the one of using the length of pits. In this technique, the positions of pits is wobbled in the radius direction of the optical disk, and then in formation is recorded by means of FM modulating the wobble.[0006] However, when reproducing a wobble signal r...

Claims

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Application Information

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IPC IPC(8): G11B7/007G11B7/013G11B20/00G11B20/14G11B20/22G11B20/24
CPCG11B7/007G11B7/24085G11B20/00086G11B20/24G11B20/1403G11B20/22G11B20/00601
Inventor KURODA, KAZUOTANIGUCHI, SHOJIMORIYAMA, YOSHIAKI
Owner PIONEER CORP
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