Method for producing multi-exponent read-only mother disc

A master disc and disc technology, applied in the field of digital storage, can solve problems affecting the crosstalk between sequence codes and other issues

Inactive Publication Date: 2009-01-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Method for producing multi-exponent read-only mother disc
  • Method for producing multi-exponent read-only mother disc
  • Method for producing multi-exponent read-only mother disc

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Embodiment Construction

[0103] 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 Rohm&Haas of Britain to be Microposit S1800-4 photoresist), use the master disk recording system (in the present invention, the ∏ mastering System of NIMBUS in England) to record the master disk, adopt the laser of the model NLHV 500C of Nichia in Japan) to expose the photoresist, develop, and make Master disk.

[0104] 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 t...

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Abstract

A method for preparing multi-order read-only mother disc includes forming user data in binary system to be multi-order coding sequence through error correction coding and multi-order modulation coding for generating write in signal being used to control mother disc write-in, setting inter-channel gap said mother disc to be less than 0.52 micron, utilizing said write in signal to control write-in laser power outputted by laser for carrying out write-in on mother disc so as to generate multi-order read-only mother disc.

Description

[0001] This application is a divisional application of the invention patent application with the application number 200510053509.3, the application date is March 8, 2005, and the invention title is "multi-level read-only optical disk and its manufacturing method". technical field [0002] The present invention relates to digital storage technology, more specifically, relates to the digital storage technology using CD-ROM. Background technique [0003] 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 number...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/26G11B7/0045G11B7/125G11B7/007G11B7/126
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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