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Optical disc device and method for discriminating different kinds of optical discs

A technology of an optical disc device and a discriminating method is applied in the directions of recording/reproducing by optical method, optical recording/reproducing/erasing method, recording of information on a magnetic disc, etc. Effect

Inactive Publication Date: 2008-07-02
HITACHI-LG DATA STORAGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in DVD and HD-DVD, since the distance from the disc surface to the recording surface is the same, it cannot be judged by this method alone.

Method used

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  • Optical disc device and method for discriminating different kinds of optical discs
  • Optical disc device and method for discriminating different kinds of optical discs
  • Optical disc device and method for discriminating different kinds of optical discs

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Embodiment Construction

[0019] FIG. 1 is a block diagram showing an embodiment of an optical disc device of the present invention. This device is a 3-wavelength laser compatible type. As the optical disc 1, it can load BD and HD-DVD of large-capacity discs, as well as various conventional DVDs (DVD-ROM, DVD-RAM, DVD-R, DVD-RW, DVD+ R, DVD+RW) and CD, etc. The optical disc 1 is rotated by a spindle motor 2 , and the optical pickup 3 is moved in the radial direction of the optical disc 1 by a screw motor 4 . The optical pickup 3 is irradiated with laser light of a predetermined intensity at a predetermined wavelength through an objective lens (not shown), and the type of the loaded optical disc 1 is discriminated, and recording or reproduction of signals on the optical disc 1 is performed. At this time, the objective lens is slightly moved in the focusing direction and the tracking direction by an actuator not shown. The servo circuit 5 controls the spindle motor 2, the screw motor 4 and the actuator...

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Abstract

This invention provides an optical disc device and method for discriminating between DVD and HD-DVD more rapidly. After an optical pickup has been stopped above a data region on the optical disc, a tracking error signal generator acquires amplitude ''Vdpp'' based on a DPP method and amplitude ''Vdpd'' based on a DPD method as tracking error signals. A disc discriminator discriminates the kind of optical disc by comparing the acquired ''Vdpp'' and ''Vdpd'' data with a threshold level ''Vth''. Alternatively, the optical pickup is stopped above the data region and a system lead-in region on the optical disc, and then amplitude values ''Vdata'' and ''Vlead'' of tracking error signals are acquired and compared.

Description

technical field [0001] The present invention relates to an optical disc device including a large-capacity optical disc capable of discriminating its type, and an optical disc discrimination method. Background technique [0002] As a large-capacity optical disc using a blue laser, there is currently an optical disc device corresponding to the standardization of BD (Blue Disc) and HD-DVD (High Definition DVD). Furthermore, a three-wavelength laser type optical disk device has been developed that can handle all of the conventional CDs and DVDs. However, in this device, it is necessary to accurately discriminate the type of the loaded optical disk. [0003] In conventional optical disc identification methods, the type of optical disc loaded is identified using the difference in distance from the disc surface to the recording surface (that is, the depth of focus). However, since the distance from the disc surface to the recording surface is the same in DVD and HD-DVD, it cannot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B19/12G11B7/004
CPCG11B19/12G11B2007/0006G11B7/0906
Inventor 原启今井猛齐藤俊雄市川裕之
Owner HITACHI-LG DATA STORAGE