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Optical disc device and control method thereof

A technology of an optical disc device and a control method, which is applied to optical recording/reproduction, optical recording/reproduction/erasing methods, recording information on a magnetic disk, etc., and can solve problems such as counters being out of control

Inactive Publication Date: 2005-07-13
KK TOSHIBA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is a problem that the falling edge of the first S-shaped signal S1 and the rising edge of the second S-shaped signal S2 are misrecognized as one S-shaped signal, and the counter for measurement runs out of control.

Method used

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  • Optical disc device and control method thereof
  • Optical disc device and control method thereof
  • Optical disc device and control method thereof

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Embodiment Construction

[0017] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the embodiment described below, the S-shaped signal detection circuit that detects a plurality of S-shaped signals included in the read signal is shown, and the output of the S-shaped signal detection circuit is used for discrimination of the type of the optical disc, but it is not limited to this , is also suitable for auxiliary control in a focus control unit, for example.

[0018] figure 1 is a block diagram showing an optical disc device according to this embodiment, figure 2 It is a figure which shows the detailed structure of the pickup of the same optical disk apparatus. Fig. 3 is a diagram showing the configuration of an S-signal detection circuit of the same optical disc device.

[0019]

[0020] (composition and action)

[0021] The optical disc device related to this embodiment such as figure 1 constructed as shown. Here, the optical dis...

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Abstract

PROBLEM TO BE SOLVED: To provide an optical disk unit having a discriminating performance of a kind of optical disk with a high noise proofing property by discriminating a plurality of sigmoid signals included in an optical disk reading signal with different thresholds. SOLUTION: This optical disk unit is provided with: a reading section 15 for reading a reflected light of a laser beam from the optical disk to output the read signal including the 1st sigmoid signal S1 and 2nd sigmoid signal S2; a 1st comparison section 52 for detecting the 1st sigmoid signal by comparing the read signal with a 1st threshold TH1+; a 2nd comparison section 53 for detecting the 2nd sigmoid signal by comparing the read signal with a 2nd threshold TH2+ larger than the 1st threshold; and a time measuring section 57 for measuring the period of time till the 2nd sigmoid signal is detected by the 2nd comparison section from the time the 1st sigmoid signal is detected by the 1st comparison section. COPYRIGHT: (C)2005,JPO&NCIPI

Description

technical field [0001] The present invention relates to an optical disc device and a control method thereof, in particular to a method for detecting an S-shaped signal from a read signal of the optical disc to determine the type of the optical disc. Background technique [0002] As is well known, various types of optical discs, such as DVDs (Digital Versatile Discs: compact discs) dedicated for recording and playback, and existing CDs (Compact Discs: Laser Discs), are widely used as recording media for digital data. Furthermore, high reliability is desired in an optical disc device for reproducing these optical discs. In addition, in such an optical disc device, it is necessary to cope with various types of optical discs, and it is necessary to identify the type of optical disc. [0003] In Japanese Unexamined Patent Publication No. 10-188458, it is disclosed that the reflected light beam obtained by focusing the light beam on the disk is detected, and the type of the disk ...

Claims

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Application Information

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IPC IPC(8): G11B7/085G11B7/00G11B7/004G11B19/12
CPCG11B19/06G11B19/12G11B2019/121
Inventor 森崇之米泽实
Owner KK TOSHIBA
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