Multistep read-only optical disk and its making method

An optical disc and order technology, which is applied in the manufacture of optical record carriers, optical recording/reproduction, optical record carriers, etc., can solve the problems affecting the crosstalk between sequence codes, etc.
CN100369140CInactive Publication Date: 2008-02-13SHANGHAI XIANGZHANG ELECTRONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI XIANGZHANG ELECTRONICS
Publication Date
2008-02-13
Estimated Expiration
Not applicable · inactive patent

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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.
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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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