Elevalation method for optical pickup apparatus, test disc and optical disc

A technology of an optical pickup device and an evaluation method, which is applied to the application field of optical discs and optical pickup devices, can solve the problems of discontinuous images, undesired, damage to the commercial value of players, etc., and achieve the effect of uniform separation performance between layers

Inactive Publication Date: 2011-09-07
SANYO ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because of this action, the transition time to layer 1 will be delayed
If the migration is delayed in this way, the start of reproduction on layer 1 will be delayed, and as a result, there is a problem that the seamlessness of data cannot be guaranteed.
[0010] When movie content etc. are recorded across layers, if there is a problem with seamlessness like this, undesired situations such as image discontinuity will occur, so there will be a problem that the commercial value of the player will be significantly damaged.

Method used

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  • Elevalation method for optical pickup apparatus, test disc and optical disc
  • Elevalation method for optical pickup apparatus, test disc and optical disc
  • Elevalation method for optical pickup apparatus, test disc and optical disc

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Embodiment Construction

[0045] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the present invention is applied to an evaluation method for evaluating the characteristics of an HD-compatible optical pickup device.

[0046] first, figure 1 The structure of the test disk 10 used for the evaluation of an optical pickup apparatus is shown. The test disc 10 has substantially the same physical format as that of a playback-only HD DVD-ROM.

[0047] As shown in the figure, the test disk 10 has a structure in which a recording layer 12 , an intermediate layer 13 , a recording layer 14 , a substrate 15 , and a printing layer 16 are laminated on a substrate 11 in this order. Here, the thickness of the intermediate layer (interval between the recording layers 12 and 14 ), the thickness and refractive index of the substrates 11 and 15 are set as follows.

[0048] (1) Thickness of substrates 11 and 15: 0.590 (mm)

[0049] (2) Refractive i...

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Abstract

The present invention provides an evaluating method which can smoothly evaluate the separating property (interlayer separating characteristic) of S-shaped curve in the optical pickup device and a test disc wherein. The time length B of flat interval of focusing error signal existing between an S-shaped curve S0 and S-shaped curve S1 is determined. The separating degree of S-shaped curves S0 and S1 is detected from the ratio B / A between the time length B and the time interval A between the S-shaped curves S0 and S1. Afterwards, when the ratio B / A is above a threshold alpha, the interlayer separating characteristic of the optical pickup device is evaluated to appropriate.

Description

technical field [0001] The present invention relates to an evaluation method of an optical pickup device and a test disc, and is particularly suitable for use in evaluating the characteristics of an optical pickup device used for recording / reproducing HDDVD (High-Definition Digital Versatile Disc). Furthermore, the present invention relates to an optical disc suitable for use in an optical pickup device deemed suitable by the above-mentioned evaluation method and test disc. Background technique [0002] Currently, HD DVD (hereinafter referred to as "HD") is being commercialized as a next-generation optical disc. In a HD with a diameter of 12 cm, 15 Gbytes of data can be recorded in one recording layer, and in a double-sided 2-layer HD having two recording layers on each side, a total of 60 Gbytes of data can be recorded. [0003] In such an HD having two recording layers laminated, the recording capacity can be remarkably increased. However, on the other hand, problems of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/09G11B7/22G11B7/24G11B7/24038G11B7/24067G11B7/24097
Inventor 中谷守雄鹫见聪日比野清司
Owner SANYO ELECTRIC CO LTD
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