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Manufacturing method of multistage read-only master

A technology for master disks and disks, applied in the field of digital storage, can solve problems such as crosstalk affecting serial codes

Inactive Publication Date: 2009-01-14
SHANGHAI XIANGZHANG ELECTRONICS
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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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  • Manufacturing method of multistage read-only master
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  • Manufacturing method of multistage read-only master

Examples

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Embodiment Construction

[0104] 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.

[0105] 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 for the production of multistage read-only mastering CD that inter-channel space more than 0.52 micron. The said method includes the following steps: a) form the binary user data to multistage coding sequence through error correction coding and multistage modulation coding, to generate writing signals for the control of mastering CD burned, and set the inter-channel space of the said multistage read-only mastering CD to greater than 0.52 microns; and b) use the said writing signals to control the power of the laser burned output from the LASER, to burn the disc of the mastering CD, and generate the multistage read-only mastering CD. According to the method of the invention, which combines the multistage technology and travel length restricted coding advantage without changing the laser wavelength and optical numerical aperture; it can significantly enhance CD-ROM storage capacity and data transfer rate, while maintaining the 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 200510053536.0, the application date is March 8, 2005, and the invention title is "multi-level read-only optical disc 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): G11B7/24G11B7/26G11B7/0045G11B7/125B29C33/38
Inventor 刘建民王豪吴大林陆晓辉苏辰宇
Owner SHANGHAI XIANGZHANG ELECTRONICS
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