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Multi-layered optical information recording medium manufacturing method

A technology for recording media and optical information, applied to optical recording media, optical recording/reproduction, magnetic recording, etc., which can solve problems such as S/N deterioration

Inactive Publication Date: 2004-11-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When reflected light from another signal recording layer fluctuates, this becomes a disturbance component of the reproduced signal and deteriorates S / N

Method used

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  • Multi-layered optical information recording medium manufacturing method
  • Multi-layered optical information recording medium manufacturing method
  • Multi-layered optical information recording medium manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] FIG. 1 shows an embodiment of a method of manufacturing a multilayer optical information recording medium according to the present invention. 1 is a schematic diagram of the steps of forming the (k-1)th separation layer 107 between the k-th signal recording layer 100 and the (k-1)th signal recording layer of a disc-type multilayer optical information recording medium, wherein The disc-type multilayer optical information recording medium has n (n is 2 or more) signal recording layers and a separation between each signal recording layer for recording and reproducing information from / recording and reproducing information to one side. layer. Here, it is assumed that the k-th signal recording layer 100 is the k-th (k is 2 or greater than 2, and n or less than n) signal recording layer from the recording / reproducing surface on which the k-th signal recording layer 100 The substrate of is the k-th signal substrate 103 . In addition, it is assumed that a stamper having guide ...

Embodiment 2

[0229] Example 2 will illustrate a method of manufacturing a multilayer optical information recording medium according to the present invention. FIG. 8 shows a case where the warping is reverse to that in Embodiment 1, that is, the k-th signal substrate is warped so as to surround the surface opposite to the k-th signal recording layer. Same as in FIG. 1 , the kth signal substrate and the (k-1)th stamper in FIG. 8 are disc-shaped with a central hole in the center.

[0230] First, as shown in FIG. 8(1), the k-th signal substrate 803 is not only provided with the k-th signal recording layer 800 on the surface of the k-th separation layer 810, but also provided with There are (n-k-1) signal recording layers in total from the signal recording layer 801 to the nth signal recording layer 802 . As in the case of Embodiment 1, the signal recording layer includes guide grooves for guiding recording light and reproducing light to record data into and reproduce data from the multilayer ...

Embodiment 3

[0251] Here, a method of manufacturing the (k-1)th stamper shown in FIG. 2 will be described. Fig. 12 is a schematic diagram of a forming metal mold provided with a heat insulator. The purpose is to warp the (k-1)th stamper to surround the surface opposite to the surface on which the grooves and dimples are provided.

[0252] FIG. 12( a ) shows a situation where the heat insulator 1200 is disposed between the master mold 201 and the mirror surface A of the metal mold. Cooling water flows through the cooling water passage A and the cooling water passage B to cool the molten polycarbonate 202 introduced into the cavity 203 of the molding metal mold 200 . By inserting the heat insulator 1200, the mirror surface B side of the metal mold is cooled according to the temperature of the cooling water flowing through the cooling water channel B, while the temperature of the molten polycarbonate 202 is hardly cooled for the original mold 201 side, so that the original mold 201 is lower ...

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Abstract

On a thick substrate having rewritable recording multi-layers on which a signal guide groove or pit is formed, by using a stumper, a separation layer is formed between the substrate and a stumper and onto its surface a signal guide groove or a pit is transferred from the stumper. At this time, since the space between the stumper and the substrate is not uniform, the separation layer has an irregular thickness. The k-th signal recording layer (100) of the k-th signal substrate (103) is arranged along the surface having the guide groove and pit (105) of the (k-1)-th signal recording layer on the (k-1)-th stumper (106). Between them, the (k-1)-th separation layer (107) is formed and the (k-1)-th stumper (106) is peeled off. Since the space between the surface having the guide groove and pit (105) of the (k-1)-th signal recording layer and the k-th signal recording layer (100) is uniform, it is possible to obtain a uniform thickness of the (k-1)-th separation layer (107).

Description

technical field [0001] The present invention relates to a method of manufacturing a multilayer optical information recording medium, wherein the multilayer optical information recording medium has n (n is equal to or greater than 2) signal recording layers and a separation layer interposed between each signal recording layer, one of the separation layers The side is used to record or reproduce information. Background technique [0002] As for a high-density optical information recording medium, a multilayer optical information recording medium having a plurality of information recording layers in the thickness direction, such as a DVD provided with two layers for reproduction on one side, is proposed. For example, a DVD provided with two layers for reproduction on one side has a structure with two substrates, one of which has an information recording surface on which a translucent reflective gold layer or silicon layer or the like is formed, and the other substrate has An i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/00G11B7/24038G11B7/26
CPCG11B7/263G11B7/24038G11B7/26
Inventor 林一英久田和也大野锐二
Owner PANASONIC CORP