Optical information recording medium examining method, examining device, optical information recording medium, and information recording method
A technology for recording media, optical information, applied in the directions of optical recording/reproducing/erasing methods, recording/reproducing by optical methods, information arrangement, etc.
Inactive Publication Date: 2012-08-08
PANASONIC CORP
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Therefore, if the gain intersection point of the servo characteristic of the inspection device is further increased in order to correspond to the linear velocity of 6 times (6×) of BD, the vibration of the actuator and the reduction of the phase margin may be caused, and the stability of the servo may not be ensured.
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[0072] Next, an embodiment of the present invention will be described by citing BD-R (Blu-ray Disc Write-once), which is one type of optical disc, as an example of an optical information recording medium. However, the optical information recording medium is not limited thereto, and may be a BD-RE (Blu-ray Disc Rewritable) or a BD-ROM (Blu-ray Disc Reproducible) capable of rewriting information multiple times. In addition, optical discs of other specifications may also be used.
[0073] The main optical constants and physical formats of Blu-ray Discs are disclosed in the white paper (ホワイト) posted on the "Blu-ray Disc Reader" (published by Oichisha) and the homepage of the Blu-ray Association (http: / / www.blu-raydisc.com). ペパパ). In BD-R, laser light with a wavelength of 405nm (400 to 410nm if the tolerance of the error range is ±5nm) and NA=0.85 (0.84 to 0.84 if the tolerance of the error range is ±0.01) 0.86) objective lens. The track pitch of BD-R is 0.32 μm, and the recordin...
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Abstract
Disclosed is a method for examining an optical information recording medium. A laser beam is directed to an optical information recording medium. The optical information recording medium is rotated under a constant linear velocity control depending on the radial position of the optical information recording medium, the rotational speed is selected from at least two linear velocities, that is either a first linear velocity Lv1 or a second linear velocity Lv2 higher than the first one is selected depending on the radial position of the optical information recording medium. A focus error signal and / or tracking error signal is generated from light reflected from the optical information recording medium. Focus control and / or tracking control of the laser beam directed to the optical informationrecording medium is conducted according to the focus error signal and / or the tracking error signal. The output branched from the control loop of the focus error signal and / or tracking error signal ispassed through a predetermined frequency band limitation filter for the focus error signal and / or the tracking error signal. The thus obtained residual error of the focus error signal and / or the tracking error signal is compared with a predetermined reference value.
Description
technical field [0001] The present invention relates to an inspection method of an optical information recording medium, an inspection device, an optical information recording medium and an information recording method. In particular, it relates to an inspection method and inspection device for an optical information recording medium that performs recording or reproduction at a high speed, and an inspection method for inspecting such an optical information recording medium for residual focus error and residual tracking error. Background technique [0002] The optical information recording medium has a recording layer, and information is recorded in the recording layer as bits or marks. In the case of reproducing information, the information is reproduced by irradiating light to the bit or mark and checking the change in the intensity of the light. Such an optical information recording medium is generally in the shape of a disc, and is called an optical disc. Hereinafter, i...
Claims
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IPC IPC(8): G11B7/004
CPCG11B19/26G11B19/045G11B7/00736G11B7/0079G11B7/268G11B7/004G11B7/09G11B19/28
Inventor 中村敦史藤畝健司日野泰守
Owner PANASONIC CORP