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Compact disk structure

A technology of optical discs and light sources, used in optical record carriers, optical recording/reproducing, instruments, etc.

Inactive Publication Date: 2007-02-07
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the noise will increase

Method used

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Embodiment Construction

[0031] Next, preferred embodiments of the structure of an optical disc according to the present invention will be described in detail with reference to the accompanying drawings.

[0032] Figure 4 It is a schematic diagram showing the structure of the optical disc according to the present invention.

[0033] refer to Figure 4 It can be seen that the structure of the optical disc according to the present invention is sequentially provided with a cover layer 20 , a protective layer 21 , a recording layer 22 , a reflective layer 23 , and a protective layer 24 starting from the upper side. A spacer layer 25 is provided in order to maintain a certain distance between the subsequent layers.

[0034] In addition, the protective layer 26, the recording layer 27, the reflective layer 28, the protective layer 29, the spacer layer 30, the protective layer 31, the recording layer 32, the reflective layer 33, and the protective layer 34 are arranged in a certain order.

[0035] That i...

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Abstract

The related characteristics of CD structure comprise: at least two record layers to read or record data according to light from resource, the reflection layer under former record layer to reflect more than 90% light with short wavelength, and the protective layer.

Description

【Technical field】 [0001] The present invention relates to the structure of optical discs. Specifically, it relates to the structure of an optical disc having a plurality of recording layers from which data can be read or stored from among recording layers selected according to the wavelength of light emitted from a light source. 【Background technique】 [0002] Recently, for optical storage media, various methods have been researched in order to increase the storage capacity thereof. [0003] For example: a method of increasing storage density by further reducing the diameter of the light spot; a method of storing signals in multiple stages (Multi-Level) to increase storage density; and setting multiple recording layers (Multi-Layer) to improve storage Density method and so on. [0004] Wherein, when the method of setting multiple recording layers (Multi-Layer) structure is used to increase the storage density, generally speaking, the reflectivity of each recording layer to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/242G11B7/258G11B7/2403
Inventor 李万炯
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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