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Multi-level read-only optical disc and method of production

A technology of optical discs and orders, applied in the manufacture of optical record carriers, recording/reproducing by optical methods, optical record carriers, etc., can solve the problems affecting the crosstalk between sequences

Inactive Publication Date: 2007-11-07
TSINGHUA UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

The parameter d controls the highest transmission frequency and thus may affect the intersymbol interference when the sequence is transmitted over a band-limited channel

Method used

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  • Multi-level read-only optical disc and method of production
  • Multi-level read-only optical disc and method of production
  • Multi-level read-only optical disc and method of production

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Embodiment Construction

[0102] In the making process of optical disc, make master disc usually earlier, the step of making master disc comprises: coating one deck master disc photoresist on glass substrate (in the present invention, adopt the model of British Rohm & Haas to be Microposit S1800-4 photoresist), use the master recording system (in the present invention, the ∏ mastering System of NIMBUS in England) to record the master, and adopt the laser of NLHV 500C model of Nichia, Japan) to expose the photoresist and develop it. Create a master disc.

[0103] Then, use this master disc as a mould, use a glass disc sputtering machine (in the present invention, adopt the model of Swiss UNAXIS to be the sputtering machine of Pyramet) glass substrate is carried out sputtering (sputtering process), coat a layer A thinner metal layer is then plated with a relatively thicker metal layer to obtain a metal negative image sub-disc, which can be used as a stamper for injection molding replication. In the pres...

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Abstract

This invention relates to multiple step read only disc and its process method with several kinds of recording grooves, wherein the grooves have different widths longitude sections and different areas, which satisfies the following formula: S=the integral ofh(x)dx, wherein, S represents longitude section area; x represents the coordinates of the width direction; h(x) represents longitude section distribution function of the record groove; the integral area is the whole longitude section area of the record groove.

Description

technical field [0001] The present invention relates to digital storage technology, more specifically, relates to the digital storage technology using CD-ROM. Background technique [0002] Existing digital disc products convert information into binary data, and the binary data corresponds to two different physical states of the record symbol of the storage medium in a certain modulation method to realize data storage. This type of storage method is called binary storage. The current read-only optical disc storage technology adopts a binary storage method. According to the intensity of reflected light, it is judged whether the current corresponding position is "Pit" or "Land". Each recording unit Two state numbers can be recorded on it, that is, information corresponding to exactly 1 bit. [0003] Multi-level storage technology is proposed relative to binary storage. If the data stream is modulated into M-ary data (M>2), and the modulated M-ary data corresponds to M dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/24G11B7/26G11B7/007G11B20/10G11B7/24088
Inventor 徐端颐倪屹潘龙法陈垦熊剑平陆达胡恒马建设裴京张启程
Owner TSINGHUA UNIV
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