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Optical disc medium, optical disc device, optical disc reproduction method and integrated circuit

An optical disc and information recording technology, which is applied in the fields of optical disc media, optical disc devices, optical disc recording and reproduction and integrated circuits, can solve problems such as lack of feasibility and increase in cost of optical heads, and achieve the effect of preventing complication

Inactive Publication Date: 2009-11-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the point of view of interchangeability with the current standardization, the cost of the optical head increases and the feasibility is lacking.

Method used

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  • Optical disc medium, optical disc device, optical disc reproduction method and integrated circuit
  • Optical disc medium, optical disc device, optical disc reproduction method and integrated circuit
  • Optical disc medium, optical disc device, optical disc reproduction method and integrated circuit

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

figure 1 The physical structure of the optical disc 1 according to this embodiment is shown. In the disk-shaped optical disc 1 , for example, many tracks 2 are formed concentrically or spirally, and each track 2 is formed in many subdivided sectors. In addition, as will be described later, in each track 2, data is recorded in units of blocks 3 of a predetermined size.

[0053]

According to the optical disc 1 of this embodiment, the recording capacity of each information recording layer is expanded compared with the conventional optical disc (for example, BD). The expansion of the recording capacity can be realized by increasing the recording linear density, for example, by further shortening the length of the recording marks recorded on the optical disc. Here, "increasing the recording linear density" means shortening the channel bit length. The term "channel bit" refers to the length corresponding to the reference period T of modulation when recording marks according to ...

no. 2 Embodiment approach

Next, an embodiment of an optical disc device that switches layer information calculation and address calculation according to recording linear density will be described.

[0101]

Figure 10 It is a block diagram showing the configuration of the optical disc device 450 according to this embodiment. The optical disc device 450 can reproduce data from the optical disc 400 and record data on the optical disc 400 . In addition, the function of recording data is not essential, and the optical disc device 450 may be a playback-only optical disc player. In this case, among the functions of the data recording and reproducing circuit of the optical disc device 450 described later, a function of receiving recorded data and writing to the optical disc 400 is not required.

[0102]

Disc 400 is figure 1 One of disc A or disc B is shown. The operation of the optical disk drive 450 is switched according to which optical disk is loaded.

[0103]

The optical disc device 450 includes...

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Abstract

It is an object to provide an address format that properly controls a recording line density and the number of information-recording layers for an information-recording medium to increase a recording capacity of the information-recording medium such as an optical disc in the range for making it possible to secure a necessary SN ratio. The optical disc is provided with an information-recording layer including concentric circles or spiral-shaped tracks, and has a format for describing track addresses recorded on a track in advance or added to data to be recorded on the information-recording layer. The format includes layer information on the information recording layers and address information on the track addresses. In a first optical disc having a first recording density, the layer information of the first optical disc is described by the first number of bits and the address information of the first optical disc is described by the second number of bits. In a second optical disc having a second recording density that is larger than the first recording density, the layer information of the second optical disc is specified by the number of bits that is less than the first number of bits and the address information of the second optical disc is specified by the number of bits that is more than the second number of bits. The total number of bits of the layer and address information of the second optical disc is equal to the sum of the first and second numbers of bits.

Description

technical field [0001] The present invention relates to a format of address information used to accurately record information at a predetermined position on an information recording medium such as an optical disc and to reproduce the information accurately, and a recording and reproduction technology for information conforming to the address information format. Background technique [0002] In recent years, people are scrambling to research and develop high-density optical discs. Currently, for example, Blu-ray Disc (BD) has been put on the market and is used for digital broadcast recording and the like, and the optical disc is establishing its position as an important information medium. In addition, as a trend towards higher densification, people are researching and developing a recording capacity larger than that of the standard BD. For these cases, see Non-Patent Document 1, for example. [0003] In order to increase the recording capacity per optical disc, a met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/12G11B7/007
Inventor 宫下晴旬中田浩平木村直浩
Owner PANASONIC CORP
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