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Information recording medium, reproduction method, reproduction apparatus and manufacturing apparatus thereof

A technology for information recording and media, which is applied in the direction of digital recording/reproduction, optical record carrier manufacturing, optical recording/reproduction, etc., and can solve problems such as heavy load and increased address reading error rate

Inactive Publication Date: 2006-01-18
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this, the load on the device becomes heavier and there is a problem that the address read error rate increases

Method used

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  • Information recording medium, reproduction method, reproduction apparatus and manufacturing apparatus thereof
  • Information recording medium, reproduction method, reproduction apparatus and manufacturing apparatus thereof
  • Information recording medium, reproduction method, reproduction apparatus and manufacturing apparatus thereof

Examples

Experimental program
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Effect test

Embodiment Construction

[0035] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] (Explanation of optical disk reproducing equipment)

[0037] figure 1 The structure of an optical disc device according to an embodiment of the present invention is shown in . The optical disc apparatus of the present invention records or reproduces information by focusing laser light emitted from a pickup head (PUH) 12 onto an information recording layer of an optical disc 11 . The light reflected from the disk 11 passes through the optical system of the PUH 12 again, and is detected as an electric signal by a photodetector (PD) 13 .

[0038] The PD 13 may be divided into two or more elements, a signal obtained by subjecting output signals of the divided elements to an addition process is called a sum signal, and a signal obtained by subjecting the output signals to a subtraction process is called a difference signal. In particular, a sum sign...

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PUM

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Abstract

The numbers of times by which plural types of segments are consecutively arranged are limited, an address reading performance is enhanced and address information is correctly read out based on determination of the number of consecutive segments. A track is divided into physical segments, N (=17) wobble data units of constant length are formed in each physical segment, the wobble data unit (WDU) is defined to include a first unit (P) having a wobble modulation portion in a first half portion, a second unit (S) having a wobble modulation portion in a latter half portion and a third unit (U) having no wobble modulation portion, and the physical segment is defined to have segment types (TYPE 1, 2, 3) which each include the third unit (U) in a certain area thereof without fail and respectively include the first, second and a combination of the first and second units in the remaining areas. In the arrangement on the track, a lower-limit number of times M1 by which the first and second types (TYPE1, TYPE2) are consecutively arranged and an upper-limit number of times M2 by which the second types (TYPE2) are consecutively arranged are limited and the first type (TYPE1) and the second type (TYPE2) are respectively arranged immediately before and after the third type (TYPE3).

Description

technical field [0001] The present invention relates to effective techniques applied in the fields of optical discs, reproducing methods, reproducing devices and manufacturing devices thereof, and also relates to information recording media as optical discs. Background technique [0002] As is well known in the art, recently, as an optical disc on which information can be recorded at a high density, an optical disc having a recording capacity of 4.7 GB on one surface layer has been put into practical use. For example, rewritable DVD-RAM (ECMA-330), +RW (ECMA-337), DVD-RW (ECMA-338), etc. are provided. [0003] The above-mentioned optical disc has an information recording layer formed on a transparent substrate, and records / reproduces information to / from the optical disc by focusing laser light on the optical disc. A guide groove called a groove is formed in an information recording layer of an optical disc as an information recording / reproducing means. The information reco...

Claims

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Application Information

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IPC IPC(8): G11B7/00G11B7/007G11B20/12G11B7/26G11B7/005G11B7/24082G11B20/18
Inventor 小川昭人能弹长作柏原裕长井裕士
Owner KK TOSHIBA