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Optical information recording medium and method for manufacturing the medium

A recording medium and optical information technology, applied in the manufacture of optical record carriers, optical recording/reproducing/erasing methods, optical record carriers, etc., can solve problems such as stopping initialization processing, and achieve the effect of improving production and preventing stoppage

Inactive Publication Date: 2005-06-15
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The first problem is that when initialization processing is performed sequentially one by one on the first information layer and the second information layer, the second information layer may be partially initialized in the process of providing BCA for the first information layer
[0019] The second problem is that the defocus may occur on the same radial area as the BCA range of the first information layer, so during the initialization of the second information layer after the initialization of the first information layer, the initialization process is stopped

Method used

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  • Optical information recording medium and method for manufacturing the medium
  • Optical information recording medium and method for manufacturing the medium
  • Optical information recording medium and method for manufacturing the medium

Examples

Experimental program
Comparison scheme
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no. 1 example

[0076] Embodiments of the present invention will be described below with reference to the drawings.

[0077]A technique for solving the above-mentioned first problem of preventing the second information layer from being partially initialized during initialization of the first information layer is explained in this embodiment.

[0078] (disk structure)

[0079] The following will refer to image 3 The disc structure used in this embodiment will be described. exist image 3 In , the laser beam for recording or reproducing information or initializing the information layer enters from the transparent layer 7 side. The substrate 1 is made of a resin plate such as polycarbonate or PMMA or a glass plate. The surface of the substrate 2 is covered with helical or concentric grooves.

[0080] The first information layer 3 is formed on the substrate 1 (on the laser beam incident side). The first information layer 3 includes at least a reflective layer 8 , protective layers 9 and 11...

no. 2 example

[0132] A technique for solving the above-mentioned second problem of avoiding stop of initialization of the second information layer after defocusing occurs during initialization is explained in this embodiment.

[0133] When initializing the second information layer 6, with the BCA range on the first information layer 3 (the first area, see figure 1 ) of the same radius (the third region, see figure 1 ) and have the same data area on the first information layer 3 (the second area, see figure 1 ) area of ​​the same radius (the fourth area, see figure 1 ) to change the initialization power, linear velocity and defocus amount in order to study the stability of the initialization. The results of the study are described below. The disk structure and initialization means in this embodiment are the same as those in the first embodiment, so detailed description is omitted.

[0134] On the first information layer 3, a BCA is preliminarily formed by initialization processing in a B...

no. 3 example

[0159] A technique for solving the above-mentioned second problem of avoiding stop of initialization of the second information layer after defocusing occurs during initialization is explained in the embodiment.

[0160] When initializing the second information layer 6, with the BCA range on the first information layer 3 (the first area, see figure 1 ) area of ​​the same radius (the third area, see figure 1 ) with the data area on the first information layer 3 (the second area, see figure 1 ) area of ​​the same radius (the fourth area, see figure 1 ) to change the feed spacing of the initialization laser beam in order to study the stability of the initialization. The results of the study are described below. The disk structure and initialization means in this embodiment are the same as those in the first embodiment, so detailed description thereof will be omitted.

[0161] On the first information layer 3, a BCA is preliminarily formed by initialization processing in an are...

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Abstract

The present invention provides a method of properly performing initialization of an optical information recording medium in which the stop of the initialization process is avoided, thereby improving the yield of manufacturing the optical information recording medium. In initializing the information layer with a burst recording area (hereinafter referred to as "BCA"), the laser power, linear velocity and laser light used for the information layer are changed between the BCA range and the data area of ​​the area for recording and reproducing information. At least one initialization condition in the focus of the bundle. In initializing the information layer without BCA, at least one initialization condition including laser power, linear velocity, and laser beam focus and feeding pitch for the information layer is changed between an area corresponding to the BCA and an area corresponding to the data area.

Description

technical field [0001] The present invention relates to an optical information recording medium for recording and reproducing information using an optical device such as a laser beam, and a method of manufacturing the same. Background technique [0002] There are conventional technologies capable of recording and reproducing information at high density using laser beams. This conventional technology is mainly commercialized as optical discs. [0003] Optical discs can be roughly classified as read-only, write-once-read-many, and rewritable. [0004] A read-only type is commercialized as a compact disc or a laser disc, and a write-once read-many type and a rewritable type are commercialized as a disc for recording document files and data files. Magneto-optical disks and phase-change optical disks are generally referred to as rewritable optical disks. [0005] A phase-change optical disc utilizes a reversible change in the state of a recording layer that occurs between a no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/007G11B7/24G11B7/26
CPCG11B7/00736G11B7/268G11B7/26G11B7/007G11B7/0055G11B7/243
Inventor 坂上嘉孝西内健一长田宪一
Owner PANASONIC CORP
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