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Reproduction light quantity setting method for optical disk, and optical disk device

A setting method and technology of an optical disc device, which are applied in the directions of recording/reproducing by optical methods, light beam source, optical recording head, etc., can solve the problems of deteriorating recording marks, unable to detect the state of greatly deteriorated recording marks, and non-reproducible recording marks. , to achieve the effect of preventing irreproducibility

Inactive Publication Date: 2010-03-24
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the above-mentioned conventional optical disc device, only the change in the amplitude of the reproduction signal is detected, so it is impossible to detect the state in which the recording mark is greatly deteriorated, and the state in which the recording mark cannot be reproduced is sometimes deteriorated.
In addition, as described in the above-mentioned Patent Document 1, in order to display a still image on an optical disc, a change in the reproduction signal amplitude is detected using a user area to be reproduced, and for the user, there is a possibility that a necessary recording mark cannot be reproduced.

Method used

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  • Reproduction light quantity setting method for optical disk, and optical disk device
  • Reproduction light quantity setting method for optical disk, and optical disk device
  • Reproduction light quantity setting method for optical disk, and optical disk device

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Embodiment approach 2

[0070] Next, Embodiment 2 of the present invention will be described. A schematic diagram showing the configuration of an optical disc device according to Embodiment 2 and figure 1 same. Figure 9 It is a schematic diagram showing a test recording area on the optical disc used in the second embodiment.

[0071] exist Figure 9 In the recordable optical disc 20, a disc management area 22 is provided on the inner peripheral side of the user area 21, and a disc test area 23 is provided on the inner peripheral side of the disc management area 22. The disk test area 23 is usually used for test recording when setting an optimum recording light amount, and a recording light amount suitable for the optical disc is set by a known test method. In this embodiment, after the optimum recording light quantity is determined, a predetermined amount of test information is recorded in the disc test area 23 using the optimum recording light quantity. This predetermined amount can be set as th...

Embodiment approach 3

[0080] Next, Embodiment 3 of the present invention will be described. A schematic diagram showing the configuration of an optical disc device according to Embodiment 3 and figure 1 same. Figure 10 It is a current showing the relationship between the high-frequency driving current waveform applied to the light source 2 used in the third embodiment and the light emission amount when the light beam 3 emitted from the light source 2 contains high-frequency components (high-frequency components are superimposed on the DC component) - Diagram of the amount of light emitted. exist Figure 10 In , the central value C of the drive current represents the DC component. Figure 11 yes means Figure 10 The schematic diagram of the time-dependent change in the light emission amount of the light source 2 in , shows "peak power", "valley power", and "average power". Figure 12 (a) and (b) are with Figure 10 The same current-light emission amount relationship graph shows changes in th...

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Abstract

In a method for setting light quantity irradiated for reproducing an optical disk, a region where information on the optical disk is recorded is reproduced by using reproduced light quantity for testing (S14, S24). Reproduction time and the number of reproduction times until a quality value of a reproduction signal reaches a prescribed value,are obtained (S20, S30), and reproduced light quantity used in reproduction is set by performing an operation by using values (S32). A state that a recording mark is significantly deteriorated can be detected and the recording mark can be avoided from deterioration to a state impossible to reproduce.

Description

technical field [0001] The present invention relates to a method for setting the amount of reproducing light for reproducing an optical disc, an optical disc, and an optical disc device using the method. The present invention suppresses the amount of deterioration of information on the optical disc due to reproducing light within a predetermined range. Background technique [0002] Regarding the amount of reproduction light when reproducing an optical disk, there are contrary requirements as described below. From the viewpoint of the quality of the reproduced signal, it is advantageous to perform reproduction with a slightly larger amount of reproduced light because noise can be reduced. On the other hand, it is advantageous to perform reproduction with a slightly smaller amount of reproducing light from the viewpoint of the ability of the optical disc to withstand the amount of reproducing light and the life of the semiconductor laser. In response to such contradictory req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/125G11B7/005
CPCG11B7/1267
Inventor 竹下伸夫的崎俊哉
Owner MITSUBISHI ELECTRIC CORP