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Information record layer formation method and optical record media production

A technology for optical recording media and information recording, which is applied in the manufacture of optical record carriers, optical record carriers, etc., can solve the problems of complicated manufacturing processes and increase costs, and achieve the effect of suppressing cost growth and achieving a large degree of freedom.

Inactive Publication Date: 2003-04-02
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in other words, regardless of the specific method, "some kind of treatment" is required, which will cause complicated manufacturing processes and increase costs

Method used

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  • Information record layer formation method and optical record media production
  • Information record layer formation method and optical record media production
  • Information record layer formation method and optical record media production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Here, a description will be given of an experimental example of preventing the occurrence of swelling on the upper surface of the second light-transmitting layer 116 by utilizing the curved shape of the outer peripheral portion (outer portion) of each layer.

[0101] In this experiment, the substrate 104 and the resin stamper 140 were produced by injection molding (as already described). The master stamper 128K for substrates and the original stamper or sub-mold 126G for resin stampers mounted on the molding dies 160 and 180 are for groove recording and have a track pitch of 0.3 μm.

[0102]For the substrate 104, polycarbonate resin (H4000-N282 manufactured by Mitsubishi Engineering Plastics) is used, the mold temperature is 125° C., the resin melting temperature is 360° C., and the mold clamping force is 35 tons to make a substrate 104 with an outer diameter of 12 cm and a thickness of 1.1 mm. .

[0103] On the other hand, the resin stamper 140 adopts olefin resin (ZE...

Embodiment 2

[0112] For comparison, according to the experiment conducted by the inventors in parallel with the experiment related to the above-mentioned Example 1, except for the combination of the substrate (104) and the resin stamper (140) whose outer peripheral portion is flat (no bending pattern is formed), according to An optical disc (102) was produced under the same conditions as in Example 1 above, and the outermost raised portion (160) protruded 60 μm from the surface of the second light-transmitting layer 116 corresponding to the information recording area (S2). In this state, the optical disc (102) may collide with a laser detector for reading and writing (not shown in the figure), and some kind of post-processing is required.

[0113] However, for example if Figure 8 As shown, this problem can be solved by forming a size R1 somewhat larger than the final product of the optical disc 202 itself, and then cutting off the outer peripheral portion A8 other than the predetermined s...

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Abstract

The present invention provides a method of manufacturing a multilayer optical disk that can suppress cost increase to the minimum and realize a large capacity. First, a first information recording layer is formed on a base plate. On the other hand, a light transmissive resin stamper having fine asperities (the second recording layer for transfer) and adhered together through the first ultraviolet-rays curable light transmissive layer. Then, removing the stamper, the second light transmissive layer is formed on the supper surface of the second information recording layer transferred and formed on the first light transmissive layer. The laser beam La is radiated from the second light transmissive layer to record and / or reproduce information signals on the first and the second information recording layers.

Description

technical field [0001] The present invention relates to a method for forming an information recording layer of an optical recording medium and a method for manufacturing an optical recording medium using the forming method Background technique [0002] As a form of an optical recording medium storing audio, video, and other various information, for example, an optical disk in which information signals are written by embossed pits is widely used. The most basic form of a compact disc is Figure 12 As shown, the optical disc 2 is provided with an information recording layer 8 having a reflective film 6 on a light-transmitting molded substrate (support plate) 4, and a protective layer 12 formed of ultraviolet curable resin or the like is formed thereon. On this optical disc 2 , laser light La is irradiated from the molding substrate 4 side as a light-transmitting layer to read information signals from the information recording layer 8 . [0003] The information recording layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/26G11B7/24
Inventor 山家研二小卷壮须澤和树
Owner TDK CORPARATION
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