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Compact disc and substrate and moulding metal die thereof

A technology for optical discs and substrates, applied in the field of metal molds, can solve the problems of deformation of the substrate 101, different thermal expansion coefficients, noise, etc., and achieve the effect of no mechanical deformation and no optical distortion.

Inactive Publication Date: 2004-10-13
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the ultraviolet curable resin solidifies over time after dispensing, for example, when the ambient temperature changes, the material of the clamping plate 106 and the material of the substrate 101 are different. are not the same, so deformation occurs on the substrate 101, which is the main cause of noise

Method used

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  • Compact disc and substrate and moulding metal die thereof
  • Compact disc and substrate and moulding metal die thereof
  • Compact disc and substrate and moulding metal die thereof

Examples

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Embodiment Construction

[0054] Below, use Figure 1-Figure 10 Embodiments of the present invention will be described.

[0055] Embodiment 1

[0056] figure 1 It is a cross-sectional view of the optical disk according to Embodiment 1 of the present invention in the thickness direction passing through the rotation center axis. However, it shows the state before the clamping plate described later is installed. exist figure 1 Among them, 11 is an optical disc substrate, 12 is an operation surface, 13 is an information surface, 14 is a clamping plate holding surface, 16 is a concave portion, 18 is an information recording layer, 19 is a protective coating, and 10 is a rotation center axis. When the optical disk substrate is configured as described above, its function and manufacturing method will be described below.

[0057] The substrate 11 is a light-transmitting disk made of polycarbonate, acrylic resin, etc., which is usually formed by injection molding. An information surface 13 forming grooves...

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Abstract

An optical disk substrate of the present invention includes at least a clamp plate (51), a clamp plate retaining surface (14), a handling surface (54), and an information surface (13). The clamp plate retaining surface retains the clamp plate with an outer circumferential side flat portion of the clamp plate being in contact therewith. The handling surface is provided outside the outer circumference of the clamp plate retaining surface. The information surface is provided outside the outer circumference of the handling surface. In the clamp plate, the outer circumferential side flat portion (51a) is thinner than its inner circumferential side flat portion (51b).

Description

technical field [0001] The present invention relates to an optical disc for recording or reproducing information, its substrate, and a metal mold for shaping the substrate. Background technique [0002] Conventionally, as an optical disc and its substrate, there has been a compact disc-shaped product described in JP-A-5-303768. [0003] A schematic sectional view of a conventional optical disc is shown in FIG. 11 . In Fig. 11, 101 is an optical disc substrate, 102 is an operation surface, 103 is an information surface, 104 is a clamping plate holding surface, 106 is a clamping plate, 107 is a groove, 108 is an information recording layer, and 109 is a protective coating, 120 is the central axis of rotation. Hereinafter, the functions of the thus-configured optical disc and its substrate will be described. [0004] The optical disk is constructed in such a way that the information surface 103 formed on one main surface of a disk-shaped light-transmitting substrate 101 made...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/2533G11B7/2534G11B7/258G11B7/2585G11B7/259G11B7/2595
CPCG11B17/0284G11B7/258G11B7/259G11B7/2595G11B7/2533G11B7/2534G11B7/2585Y10T428/21
Inventor 内田清黑章山本富夫花川荣一
Owner PANASONIC CORP