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Multistep read-only optical disk and its making method

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

Inactive Publication Date: 2005-08-24
SHANGHAI XIANGZHANG ELECTRONICS
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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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  • Multistep read-only optical disk and its making method
  • Multistep read-only optical disk and its making method
  • Multistep read-only optical disk and its making method

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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 disk recording system (in the present invention, the ∏ mastering System of NIMBUS in England) to record the master disk, 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. I...

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Abstract

This invention relates to a multistage read-only CD and its manufacturing method. This CD has many kinds of recording pits, the vertical section of the recording pits and along the width direction is multistage random shape, and the areas of vertical sections of different stage recording pits are different, and the area of the vertical section of the recording pit fits to the following formula: S=integral h(x)dx, there into, S denotes the area of the vertical section, x shows the coordinate of the width direction of the recording pit, h(x) is the pit depth distribution function on the vertical section of the recording pit, the integral region is the whole vertical section of the recording pit. In addition, it can limit the vernier length of multistage read-only CD. This invention combines the strong points of multistage technology and vernier length limitation coding, can greatly increase the storage capability and data transmitting efficiency of read-only CD without changing the laser wave length and optical aperture, and maintain greatest compatibility to the present read-only CD system.

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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IPC IPC(8): G11B7/007G11B7/24085G11B7/26
Inventor 刘建民王豪吴大林陆晓辉苏辰宇
Owner SHANGHAI XIANGZHANG ELECTRONICS
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