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Optical information recording medium and its manufacturing method

A technology for recording media and optical information, applied in the field of stampers for manufacturing substrates and their manufacturing, stampers and their manufacturing fields, and can solve the problem that the optical path difference cannot be obtained, the recording capacity of the optical information recording medium can be increased, and the laser optical path cannot be obtained. and other problems, to achieve the effects of easy grooving and substrate forming, reducing optical information, and improving recording density

Inactive Publication Date: 2005-10-19
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.
Moreover, in the case of an optical information recording medium using the wide and narrow portions of the 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

[0069] 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 .

[0070] Described optical information recording medium can be manufactured with the following steps: the original disc groove process of forming required pattern on the original disc surface, the stamper production process of making stamper based on the original disc after the groove, duplicating with the stamper made Substrate production process of optical information recording medium substrate, and film formation process of forming various films on the replicated substrate.

[0071] [Master and stamper manufacturing method for substrate manufacturing]

[0072] 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. Such as Figure 5A...

Embodiment 2

[0094] 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

[0098] 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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PUM

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Abstract

The technical subject of the present invention is to provide an optical information recording medium and method for producing the same with excellent recording / reproduction characteristics and tracking characteristics, and signal pits in the groove. In addition, the present invention provides a substrate pressing mold and the production method to produce the said optical information recording medium. In the optical information recording medium of the present invention, since signal pits are allocated on the groove with flat bottom surface, the height difference between the position of the interface between the groove portion of the recording layer containing organic pigment and the reflective layer, and the position at the interface between the recording layer and the reflective layer in the signal pits portion of the groove, is larger compared to that of the optical information recording medium having wide width portion and narrow width portion in the groove. The information of the signal pits in the groove can be recorded with high degree of modulation and low wobble.

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