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Optical recording medium and misalignment measuring instrument using the same

一种检测装置、偏心量的技术，应用在头的配置/安装、仪器、光学记录载体等方向，能够解决精度恶化等问题，达到增大记录容量的效果

Inactive Publication Date: 2005-10-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem of deterioration of accuracy during reading and writing.

Method used

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  • Optical recording medium and misalignment measuring instrument using the same
  • Optical recording medium and misalignment measuring instrument using the same
  • Optical recording medium and misalignment measuring instrument using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Embodiment 1 illustrates an example of an optical recording medium related to the present invention.

[0066] figure 1 It is a schematic plan view showing the structure of the optical recording medium 101 according to Embodiment 1 of the present invention.

[0067] figure 1 Among them, the optical recording medium 101 is in the shape of a disk, and is provided with a spiral imaginary groove center line 102 ( figure 1 only partially shown). Moreover, on the optical recording medium 101, the servo area 103 and the data area 104 are arranged alternately in the circumferential direction of the disc. Among them, the data area 104 is an area for recording and reproducing information. There are N number of servo areas 103 and data areas 104 respectively (N is an integer greater than or equal to 500, 1280 in this example).

[0068] also, figure 1 The disc center 105 in is a virtual point located at the center of the disc-shaped optical recording medium 101 .

[0069]...

Embodiment 2

[0098] In Embodiment 2, an example of the eccentricity detecting device using the optical recording medium according to the above-mentioned Embodiment 1 will be described.

[0099] Figure 5 It is a schematic block diagram showing a configuration example of an eccentricity detection device according to Embodiment 2 of the present invention.

[0100] Figure 5 Among them, the eccentricity detection device 500 includes an optical recording medium 101 , a detection circuit 501 , a tracking error generation circuit 502 , a direction detection unit 503 , a pattern counting unit 504 , and an eccentricity calculation unit 505 . Figure 5 The optical recording medium 101 is the same as the optical recording medium 101 described in the first embodiment.

[0101] When the disc center of the optical recording medium 101 is eccentric to the center of the data area, the optical spot and the optical recording medium 101 irradiated along the groove center line 102 and read out the data sig...

Embodiment 3

[0140] Hereinafter, another example of the optical recording medium of the present invention will be described using Example 3.

[0141] Figure 14 A schematic plan view showing the structure of an optical recording medium 110 according to Embodiment 3 of the present invention.

[0142] Figure 14 Among them, the optical recording medium 101 is in the shape of a disk, and is provided with a spiral imaginary groove center line 102 ( Figure 14 only part of it is shown). In addition, on the optical recording medium 101, servo areas 103 and data areas 104 are alternately arranged in the circumferential direction of the optical disc. Among them, the data area 104 is an area for recording and reproducing information. There are N number of servo areas 103 and data areas 104 (N is an integer greater than 500, here is 1280).

[0143] and, Figure 14 The disc center 105 in is a virtual point located at the center of the disc-shaped optical recording medium 101 .

[0144] The gro...

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PUM

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Abstract

An optical recording medium such that the misalignment which is the radial relative shift of the spot of a light beam on the optical recording medium with respect to the optical recording medium is accurately measured and a misalignment measuring instrument are disclosed. The optical recording medium has N servo areas (113) composed of first wobble marks (211) and second wobble marks (212) and N data areas in / from which information is recorded / reproduced. The servo and data areas are arranged alternately in the circumferential direction. In each of the servo areas, servo pattern areas (210a to 210c) where the circumferential intervals between the first and second wobble marks are different are arranged in the radial direction. The number of tracks in each of the servo pattern areas is the same and less than N / (2 x pi ).

Description

technical field [0001] The present invention relates to an optical recording medium for recording and reproducing data by using light, and an eccentricity detecting device using the optical recording medium. Background technique [0002] In recent years, optical recording media such as CDs and DVDs have been widely used as storage media for music and video, and their capacities and functions have been increased for the purpose of expanding their use. [0003] Hereinafter, an example of a conventional optical recording medium will be described with reference to the drawings. [0004] Figure 23 An example of a conventional conventional optical recording medium is schematically shown in . Such as Figure 23 As shown, on a conventional optical recording medium 1401 along a spiral groove centerline 1402 ( Figure 23 Only a part is shown) Form the servo area 1403 and the data area 1404. [0005] Figure 24 shown as Figure 23 The structure of the servo area 1403 and the data a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/00G11B7/007G11B7/013G11B7/085G11B7/09G11B7/095
CPCG11B7/0901G11B7/08517G11B7/007G11B7/0953G11B7/24085G11B7/00745G11B7/0938G11B7/00
Inventor 上田英司
Owner PANASONIC CORP
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