Recording medium, wobble cycle detection method, wobble information detection method, wobble information detection circuit, and information recording/reproduction device
A technology for recording media and information detection, applied in the direction of recording information storage, optical recording/reproduction/erasing methods, optical recording carriers, etc., can solve the problems of time-consuming, difficult to ensure information reliability and recording quality at the same time
Inactive Publication Date: 2007-10-31
RICOH KK
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[0015] However, the modulation method of the wobble for synchronization and the wobble for information are the same, and the synchronization signal and the information signal are distinguished by the difference in the wobble length of the phase inversion, so it takes time to bring in synchronization.
In addition, since information is recorded with the same cycle and only phase modulation, the incorporation of wobble components of adjacent tracks is significantly reflected in the deterioration of the information signal, and it is difficult to simultaneously ensure the reliability of the detected information and the recording quality, and advance further High density of narrow track pitch
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[0061] Hereinafter, the best mode for carrying out the present invention will be specifically described based on the drawings.
[0062] FIG. 1 is a diagram showing the structure of a general recording medium applied to one embodiment of the present invention.
[0063] The recording medium 1 is an optical disc such as a DVD+R disc or a DVD+RW disc, and as shown in FIG. 1( a ), tracks 2 are formed concentrically or spirally on the recording surface. The track 2 is composed of grooves 3 and lands 4 as shown in FIG. 1( b ).
[0064] This track 2 is prepared in advance by a recording medium forming device, and the recording device performs recording and reproduction of information along the track 2 of the recording medium.
[0065] In addition, as the rotation information in the recording medium, the groove 3 of the track 2 wobbles (meanders) when rotating at a constant linear velocity or a constant angular velocity so that a certain frequency (a certain period) can be detected. ...
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The invention provides a recording medium is characterized in that: track is divided into a first region wobbled continuously by a first wobble groove of a particular carrier cycle, an third region comprising a third wobble groove having the same sycle with that of the first wobble groove and having a 180 degree of phase offset with the first wobble groove, has a four times length of the particular carrier cycle, and a second region is composed of a second wobble groove having a cycle which is twice of the particular carrier cycle and having a twice length, which is distributed in a 180 degree of phase offset corresponding to data 0 and data 1 of the information to be stored by the wobble groove, wherein the third region is disposed at the previous one of the second region or near by.
Description
[0001] This application is a divisional application of the following patent application: application number: 200380107501.X, application date: 2003.12.26, title of invention: recording medium, swing period detection method, swing information detection method, swing information detection circuit, information recording and reproducing device technical field [0002] The present invention relates to phase-change, write-once, magneto-optical and other recording media, a method for detecting the wobble period and a method for detecting wobble information of the recording medium, a wobble information detection circuit for detecting wobble information from the recording medium, and an information recording and reproducing device. Background technique [0003] Tracks are formed in recording areas on recording media (optical discs) such as DVD+R discs and DVD+RW discs. This track functions as a guide groove for a spot of laser light irradiated for recording and reproducing information...
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IPC IPC(8): G11B7/007G11B7/004G11B7/00
Inventor 前川博史
Owner RICOH KK