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Optical disc mold having diamond-like carbonaceous layer and a molding method using the same

A diamond and optical disc technology, applied in coating, application, household appliances, etc., can solve the problems of increasing the friction between the die and the die, hindering the molding operation, reducing the number of injections, etc., and achieving long die life and die life. Long-lasting, durability-enhancing effect

Inactive Publication Date: 2005-07-13
TECHNOS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although a stamper with an insulating layer on the backside such as a ceramic material, bismuth, polyamide or polyamide-polyimide, etc. can reduce the cycle time of molding, it has the disadvantage of increasing the friction between the stamper and the mold , thereby shortening the service life of the stamper and the stamper support surface of the mold, so that the number of shots before changing the stamper and the number of shots before changing the mold are greatly reduced
[0007] Further, in the case of integrally forming the stamper and the heat insulating layer, there is a problem that strain is formed on the stamper due to the difference in coefficient of thermal expansion between the stamper and the stamper supporting surface of the stamper, preventing Proper Molding Operations

Method used

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  • Optical disc mold having diamond-like carbonaceous layer and a molding method using the same

Examples

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example 1

[0058] The surface of the steel mold cavity supporting the die is mirror-polished, and the surface is brushed with a wire brush to such an extent that the surface roughness Ra becomes about 1000 Å, and the P-V is about 10000 Å. On the resulting surface, a SiC layer with a thickness of 0.5 mm was formed by flame spraying, and then a diamond-like carbon layer with a thickness of 1.5 μm was formed thereon. It should be noted that the diamond-like carbon layer was formed by the self-bias RF plasma CVD method under the following conditions: material gas C 2 h 4 (0.017Pa.m 3 .s -1 ), power supply: RF, working pressure: 66.5Pa, input power: 500W, layer formation rate: 100nm / min. The composition of the layer is CH 0.21 , the resulting carbon layer is a diamond-like carbon layer.

example 2

[0060] The surface of the steel mold cavity supporting the die is mirror polished, and the surface is shot blasted to such a degree that the surface roughness Ra becomes about 1000 Å, and P-V is about 10000 Å. On the resulting surface, a diamond-like carbon layer was formed with a thickness of 1.5 μm. It should be noted that the diamond-like carbon layer was formed by basically the same procedure as in Example 1.

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Abstract

In order to shorten the cycle time of the molding operation, the present invention provides a mold for molding an optical disc, wherein irregularities with controllable surface roughness are formed on a stamper support surface in one mold cavity, which to such an extent that the irregularities are not transferred to the surface of the stamper, and a diamond-like carbon layer is integrally formed on the surface. A method for molding an optical disc comprising the steps of mounting a stamper including an information graphic surface on the stamper supporting surface in the above-mentioned one of the mold cavities according to the present invention, and injecting molten resin into the cavity.

Description

technical field [0001] The present invention relates to a mold for manufacturing an optical disc using a stamper (master mold) and a method for manufacturing an optical disc using the mold. More particularly, the present invention relates to molds for manufacturing optical discs with reduced cycle times, the use and methods of manufacturing optical discs using the molds. Background technique [0002] Optical discs are generally manufactured using injection molding methods. A molding cavity is formed between the two opposite surfaces of a fixed mold half and a moving mold half, according to the information formed in the surface with pits or other irregularities, the stamper containing the information graphics is mounted on both the fixed and moving molds On the support surface of one of them, molten resin is injected into the cavity, and the mold is cooled to solidify the resin so that an optical disc containing information patterns transferred from the stamper can be manufa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/38B29C33/56B29C45/26B29C45/37B29L17/00G11B7/26
CPCB29C33/56B29C45/2632B29C45/37B29C2045/264B29K2907/04G11B7/26
Inventor 石川诚
Owner TECHNOS CO LTD