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Optical information recording medium and its manufacturing method

A recording medium and a manufacturing method technology, applied to a stamper for manufacturing a substrate and its manufacturing, stamper and its manufacturing field, can solve the problem that the laser optical path cannot be obtained, the recording capacity of the optical information recording medium can be increased, and the optical path difference cannot be obtained. and other problems, to achieve the effect of reducing optical information, making grooves and substrate formation easier, and improving recording density

Inactive Publication Date: 2003-10-01
HITACHT MAXELL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the above-mentioned optical information recording medium, although there are actually some differences in the height position of the interface between the recording layer and the reflective layer in the wide portion of the track and the narrow portion of the track, it is not possible to obtain sufficient space for reproducing information. The laser optical path difference required by the signal modulation degree
A sufficient optical path difference cannot be obtained even with various changes in the size ratio of the wide portion to the narrow portion of the track, the viscosity of the recording layer material, and the substrate rotation driving conditions.
In addition, in the case of an optical information recording medium using the wide and narrow portions of the above track to record information such as medium information, it is difficult to narrow the track information pit (トラツクピツチ, track pit). It is disadvantageous to increase the recording capacity of the optical information recording medium by narrowing the track information pit
[0011] In JP-A-8-129780 and JP-A-2002-237093, it is disclosed that the film thickness of the recording layer (dye layer) formed on the substrate is different by utilizing the depth of information pits and tracks formed on the surface of the substrate. Optical information recording media, but none of the literature talks about optical information recording media with inner track information pits

Method used

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  • Optical information recording medium and its manufacturing method
  • Optical information recording medium and its manufacturing method
  • Optical information recording medium and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0080] Hereinafter, a method of manufacturing an optical information recording medium according to a first embodiment of the present invention will be described with reference to FIGS. 5 to 16 .

[0081] The above-mentioned optical information recording medium can be manufactured by the following steps: the original disk groove process of forming the desired pattern on the surface of the original disk, the stamper production process of making a stamper based on the grooved original disk, and duplication with the produced stamper. Substrate production process of optical information recording medium substrate, and film formation process of forming various films on the replicated substrate.

[0082] [Master and stamper manufacturing method for substrate manufacturing]

[0083] First use Figure 5~ Figure 9 The method of manufacturing the master and the stamper for manufacturing the substrate 1 of the optical information recording medium of the present invention will be described...

Embodiment 2

[0104] Use the following Figure 17 ~ Figure 1 9 illustrates the second embodiment of the optical information recording medium of the present invention. The optical information recording medium of this embodiment, such as Figure 17 As shown, the structure is the same as that of the first embodiment except that the predetermined format pattern formation area is composed of a medium information recording area 170b for recording medium information and a user information recording area 170c. The medium information recording area 170b is formed by a track with inner track information pits, and is formed within a radius of 23.9-24 mm based on the center AX'. On the other hand, the user recording area 170c is formed of only tracks, and is formed within a radius range of 21 to 23.9 mm and a radius of 24 to 58 mm based on the center AX'. Wherein, the track depth in the user recording area 170c is the same as the track depth in the part where no inner track information pits are forme...

example 1

[0107] use Figure 20 A modified example of Embodiment 2 will be described. The optical information recording medium of this modification example, such as Figure 20 As shown, it is an optical information recording medium in which a reflective layer 3 ", a recording layer 2 ", a protective layer 4 " and a cover layer 5 " are sequentially formed on the predetermined format pattern formation surface of the substrate 1 ", not from the substrate 1 " side but from the The surface layer 5 " side irradiates recording and reproduction with laser mode to carry out information recording and reproduction of the optical information recording medium. Regarding this optical information recording medium, since the bottom surface 201a of the optical track 201 and the bottom surface 202a of the inner track information pit 202 are formed flat , while the ratio dp' / dg' of the inner track information pit depth dp' to the track depth dg' in the substrate 1", and the maximum pit depth of the recor...

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Abstract

The present invention relates to an optical information recording medium and a manufacturing method thereof, and a stamper for manufacturing a substrate of an optical information recording medium and a manufacturing method thereof, and provides an optical information recording medium having excellent recording and reproduction characteristics and line groove characteristics and having inner track information pits A recording medium and a manufacturing method thereof, and also a stamper for manufacturing the above-mentioned optical information recording medium and a manufacturing method thereof. In the optical information recording medium of the present invention, since the inner track information pits with a flat bottom surface are arranged in an optical track with a flat bottom surface, compared with an optical information recording medium in which a wide portion and a narrow portion are formed in an optical track, the The position difference between the height position of the interface between the recording layer and the reflective layer in the track portion containing the organic dye recording layer and the height position of the interface between the recording layer and the reflective layer in the information pit portion of the inner track is increased, so that the high modulation degree and low jitter can be achieved. The information recorded in the inner track information pits is reproduced.

Description

technical field [0001] The present invention relates to an optical information recording medium and a manufacturing method thereof, as well as a stamper for manufacturing a substrate of an optical information recording medium and a manufacturing method thereof; in particular, it relates to the use of prefabricated information pits (prepits and prepits) for manufacturers and countermeasures for copyright protection. An optical information recording medium in which media information such as information is recorded in an optical track (group, group) and its manufacturing method, and a stamper for manufacturing a substrate and its manufacturing method. Background technique [0002] In recent years, DVD (Digital Versatile Disc) having a recording capacity several times larger than that of CD (Compact Disk) has been widely used as a recording medium for information such as images and audio. Moreover, for DVD, there are DVD-R digital high-definition video recordings (supplementary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/007G11B7/09G11B7/26
CPCG11B7/00736G11B7/0938G11B7/24079G11B7/261
Inventor 末永正志高桥裕介
Owner HITACHT MAXELL LTD
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