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Optical disc apparatus and its control method

一种光盘、设备的技术，应用在光盘设备及其控制领域，能够解决电路电路安排复杂、低反射率、困难等问题

Inactive Publication Date: 2007-11-21
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in practice, the two signals must be detected at the same time, and in order to achieve this, the circuit arrangement of the circuit becomes extremely complex
[0006] It is difficult to detect the amount of tilt and perform satisfactory tilt control (tilt compensation) for a disc size for high-density information recording (for example, large-capacity recording compatible with a 12cm disc using a blue laser)
This problem is not limited to single-sided / single-layer discs, but is more severe in double-sided / multi-layer discs with lower reflectivity

Method used

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  • Optical disc apparatus and its control method
  • Optical disc apparatus and its control method
  • Optical disc apparatus and its control method

Examples

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Embodiment Construction

[0050] 1 is a block diagram of an optical disc apparatus (information recording / reproducing system) according to an embodiment of the present invention, for explaining the circuit arrangement of an optical disc. Fig. 1 shows a general diagram of a system for recording or reproducing information using an optical disc having one or more information recording layers on one surface.

[0051] 1 shows an optical disc apparatus for recording or reproducing information on or from an optical disc whose information recording layer has spiral or concentric tracks. This optical disc device comprises: optical head (10), and it focuses laser beam on the information recording layer of optical disc 1 by objective lens 5, and record / reproduce information on optical disc; Focus controller (22), it makes objective lens 5 offset, In order to focus the beam spot of the laser beam on the information recording layer of the optical disc 1; the positioning unit (12), it locates the optical head 10 on ...

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Abstract

Before tracking control, tilt control is performed using an offset value of a differential phase tracking error signal obtained by performing signal process of the outputs from, e.g., a 4-split photodetector. A direction in which the tilting angle of the tilt control is to be corrected is determined based on information indicating whether the center value of the differential phase tracking error signal is 'offset to plus or minus'. Hence, tilt servo that aims at an optimal point is made while observing the amplitude of the differential phase tracking error signal using this offset polarity information.

Description

technical field [0001] The present invention relates to an optical disc device and its control method for recording or reproducing high-density information represented by, for example, high-capacity image video data (Hi-vision video data). More particularly, the present invention relates to improved tilt control in accordance with the tilt state of an optical disc mounted on a device. Furthermore, the present invention also relates to a method of detecting a tilt error in tilt control. Background technique [0002] In recent years, with the increase in the recording density of optical discs using short-wavelength lasers, it is required to properly adjust the inclination of the optical head (and its objective lens) relative to the recording surface of the disc loaded in the disc drive over the entire surface from the inner circumference to the outer circumference of the disc. compensation. As a tilt compensation means, tilt control (tilt compensation) is well known. High-d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/095G11B7/085G11B7/00G11B7/09
CPCG11B7/0956G11B7/094G11B7/0906A47G27/0243
Inventor 米泽实
Owner KK TOSHIBA