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Method for producing multi-level read-only optical disc

A technology of optical discs and master discs, which is applied in the manufacture of optical record carriers, optical recording/reproduction/erasing methods, and light beam sources, and can solve problems affecting crosstalk between sequence codes and other issues

Inactive Publication Date: 2009-01-14
TSINGHUA UNIV
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  • 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-level read-only optical disc
  • Method for producing multi-level read-only optical disc
  • Method for producing multi-level read-only optical 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 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.

[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 the pres...

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Abstract

The invention provides a method to produce multi-band CD-ROM whose track pitch is less than 0.52-micron. The method includes the following steps: a) binary user data is transformed through error correction coding and modulation coding to a multi-band coding sequence, generating control signal for master disc write, and setting the track pitch of multi-bank less than 0.52 microns; b) the control signal control the laser power of laser that is output to the recording, recording the master discs to generate multi-band master; c) take the multi-band master disc as mold, and copy the metal die; and d) use the a multi-band die to make CD-ROM. The method in the invention combines the advantages of multi-band technology and travel long restricted coding. It does not change the laser wavelength and numerical aperture optical circumstances, and can significantly improve the CD-ROM storage capacity and data transfer rate. It keeps maximum compatibility with the current CD-ROM system.

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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