Optical disc and physical address format

A technology of address information and management area, which is applied in the field of optical disc reproduction, and can solve problems such as difficulty in providing pre-pit and increase in recording density

Inactive Publication Date: 2009-01-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to provide a sufficient number of pre-pits each having a sufficient length
Therefore, there is an undesired possibility that the number of detection errors increases especially when the recording density is relatively high

Method used

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  • Optical disc and physical address format
  • Optical disc and physical address format
  • Optical disc and physical address format

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0093] FIG. 2 shows an optical disc medium 20 according to Example 1 of the present invention. The optical disc medium 20 has a recording surface 101 in which a spiral track groove 102 is formed. As shown in FIG. 1 , the shape of the track groove 102 varies on a block-by-block basis. In FIG. 1, a block mark (identification mark) 210 is a cut-off portion in the track groove 102 showing an index indicating the leading end of each block.

[0094] Each block is divided into N sectors 25 (N=32 or 16), and each sector 25 (sub-block) is divided into M frames #0 to #25 (M=26). Each frame (basic unit) has a prescribed number of wobbles 26 or 27 in a periodic manner. Wobbles 26 and 27 have prescribed shapes different from each other, and represent sub information ("0", "1" or "S"). A type of sub-information (“0”, “1” or “S”) is represented by a wobble shape 26 or 27 . There is a one-to-one relationship between the type of sub-information and the shape of the wobble (wobble 26 or 27)...

example 2

[0115] FIG. 3 shows a track groove 10 according to Example 2 of the present invention. Instead of the track groove 102 shown in FIG. 1, the track groove 10 may be formed in the optical disc medium 20 shown in FIG. In this example, in addition to wobble 26 indicating sub information "0" in frame 22 and wobble 27 indicating sub information "1" in frame 23, track groove 10 has sub information indicating sub information "S" recorded in frame 24. "Swing 28. As in Example 1, address information is represented by a combination of sub information "0" and sub information "1". The sub information "S" is set at the front end of the block, and is used to indicate the front end of the block instead of the block mark 210 shown in FIG. 1 . In this way, the overhead required for block marking 210 can be eliminated. In this example, the wobble 28 representing the sub-information "S" has a steep ascending gradient and a steep descending gradient.

example 3

[0117] Figure 4 A track groove 11 according to Example 3 of the present invention is shown. Instead of the track groove 102 shown in FIG. 1 , the track groove 11 may be formed in the optical disc medium 20 shown in FIG. 2 . In the first and second examples, one wobble type is periodically repeated corresponding to one sub-information type, and wobbles having different rising gradients and different falling gradients are used for different types of sub-information. In this example, wobbles 29 and 30 are formed so as to have different duty ratios depending on the type of sub-information. More specifically, as Figure 4 As shown, the wobble 29 indicating the sub-information "0" recorded in the frame 32 is wider on one of the peaks or troughs (in Figure 4 In the example of , it is a trough), indicating that the wobble 30 of the sub-information "1" recorded in the frame 34 is wider on the other of the peak or the trough (in Figure 4 In the example is the crest). Such a feature ...

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PUM

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Abstract

An optical disc medium includes a track groove, along which main information is recorded. The track groove is divided into a plurality or blocks. The plurality of blocks each include a plurality of frames. The plurality of frames each include one shape of wobbles indicating sub information, among a plurality of prescribed shapes of wobbles. The plurality of blocks each have address information. The address information is represented by a string of at least one piece of sub information represented by the shape of wobbles of at least one of the plurality of frames.

Description

[0001] This application is a divisional application of application 01817886.3 with the filing date of August 29, 2001, entitled "Disc and Physical Address Format". technical field [0002] The present invention relates to an optical disc medium for recording information (for example, digital video information) at high density, an optical disc apparatus and an optical disc reproducing method for the optical disc medium. Background technique [0003] Recently, the recording density of optical disc media has become increasingly higher. Generally, recordable optical disc media have track grooves therein in advance, and information is recorded along track grooves, that is, recorded in track grooves or areas between track grooves (referred to as "lands (land)") superior. The track groove is a sinusoidal wobble, and information is recorded in synchronization with a clock generated based on the wobble period. Addresses are provided along the track grooves to record information at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/007G11B7/005G11B27/24G11B20/12G11B27/30G11B27/19
Inventor 中村敦史南野顺一古宫成东海林卫石田隆石桥広道
Owner PANASONIC CORP
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