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Recording medium and its manufacturing equipment and method

A technology for information recording and recording media, which is applied in the manufacture of optical record carriers, optical record carriers, record carrier types, etc., and can solve the problems of distortion of the read signal waveform and high read error rate.

Inactive Publication Date: 2007-05-02
PIONEER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Therefore, when the information data is reproduced from the DVD on which the data is recorded, the waveform of the read signal obtained when reading the recording mark portion M1 close to the land pre-pit LPP may be distorted, which results in a higher read error rate.

Method used

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  • Recording medium and its manufacturing equipment and method
  • Recording medium and its manufacturing equipment and method
  • Recording medium and its manufacturing equipment and method

Examples

Experimental program
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Embodiment Construction

[0059] Preferred embodiments of the present invention will be specifically described with reference to the accompanying drawings.

[0060] Fig. 5 shows an example of a rewritable phase-change optical disc. An optical disc (DVD-RW) 11 includes a recording layer 15 having a medium layer formed of a phase change material such as Ag-In-Sb-Te and a glass protective layer sandwiching the medium layer formed of eg ZnS-SiO2. The groove track 12 and the land track 13 are formed on the recording layer 15 . The pair of land and groove tracks provided side by side guides the laser beam B as reproduction or recording light. The optical disc 11 has a reflective layer 16 for reflecting the light beam B, a transparent substrate (polycarbonate) 18 and an adhesive layer 19 . A transparent film (polycarbonate) 17 protecting these layers is located on the beam incident side.

[0061] A land pre-pit 14 corresponding to pre-information is formed on the land track 13 of the optical disc 11 in adv...

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PUM

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Abstract

A recording medium includes pairs of groove tracks and land tracks having periodically formed bent portion provided side by side on a substrate, a plurality of land prepits (14) previously formed on the land tracks and carrying information about the groove tracks, and a recording layer formed on at least the groove tracks and the land tracks. The land prepits have a radius of mean curvature smaller than a radius of mean curvature of sides of the groove tracks in land-prepit absent regions of the land prepits and are defined by curved surfaces continuously extending from the sides of the groove tracks. Those sides of the groove tracks which face the continuous curved surfaces of the land prepits are curved surfaces that stricture the groove tracks. The depth of the land prepit is larger than that of the groove track.

Description

(1) Technical field [0001] The present invention relates to an information recording method and device, and a manufacturing device and method of a recording medium, such as an optical disk or an optical card. (2) Background technology [0002] Recordable recording media have been produced, especially write-once DVD-R (Digital Versatile Disc Recordable) and rewritable DVD-RW (Digital Versatile Disc Rewritable) (hereinafter these media will be collectively referred to as DVD). Originally recorded on a DVD is address information, such as image information, required to find a target position when recording data, and rotation control information, such as a wobble signal, for controlling the rotation of the disc. (Hereafter, this information is collectively referred to as preset information). [0003] Rotation control information is recorded by first wobbling a data recording track (groove track or land track) into a waveform of a given amplitude at a predetermined frequency (wo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/007G11B7/24G11B7/26G11B7/013G11B7/24079G11B7/24082G11B7/24085G11B7/24091G11B27/19G11B27/24G11B27/30
CPCG11B27/3027G11B7/00718G11B2220/2575G11B7/24085G11B7/007G11B7/261G11B27/24G11B2220/216G11B7/2407G11B7/26
Inventor 加藤正浩村松英治山口淳谷口昭史大岛清朗松川真田切孝夫山登一广米龙大
Owner PIONEER CORP
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