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Optical disc equipment and method for controlling sliding block

A technology for optical discs and devices, applied in the field of slider control, can solve the problems of inability to achieve optical characteristics, unstable optical disc devices, poor recording and playback performance, etc.

Inactive Publication Date: 2004-10-20
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Excellent optical characteristics cannot be achieved if the position of the objective lens is shifted from the center of the optical field of view in slider tracking control
During tracking servo operation, the optical disc device becomes unstable and may exhibit poor recording and playback performance

Method used

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  • Optical disc equipment and method for controlling sliding block
  • Optical disc equipment and method for controlling sliding block
  • Optical disc equipment and method for controlling sliding block

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0024] FIG. 1 is a block diagram illustrating an internal structure of an optical disc apparatus 1 according to a preferred embodiment of the present invention.

[0025] FIG. 1 exemplifies the main parts of the optical disc device 1, that is, only shows the units related to the tracking servo system and the slider control system, and does not show other circuit structures.

[0026] The optical disc device 1 realized as a video camera records video data acquired by a video camera unit (not shown) on an optical disc 50 . The optical disc device 1 also plays back video data recorded on the optical disc 50 .

[0027] This camera is portable, not fixed, and can be placed in any position according to the working conditions required by the user.

[0028] The optical disc 50 shown in FIG. 1 is a high-density disc called a blue-ray disc.

[0029] The Blu-ray Disc performs recording and playback operations using a blue laser light having a center emission frequency of 405 nm and an ob...

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PUM

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Abstract

An optical disk device includes a head including an actuator that supports and moves an objective lens at least in a direction of focusing, and a slider for transporting the head in the direction of tracking. In response to a static acceleration acting on the objective lens in response to a change in the posture of the optical disk device, and a low-frequency component of a tracking servo signal for causing the objective lens to track, a slider controller drives the slider so that the objective lens is aligned with the center of an optical field of view of the head. In this arrangement, the slider is controlled with reference to the low-frequency component of the tracking servo signal corrected in accordance with the level of gravity acting on the objective lens. Slider control is thus achieved to prevent a displacement, between the objective lens and the center of the optical field of view, caused by a change in the posture of the optical disk device.

Description

technical field [0001] The present invention relates to an optical disc device for recording and reading signals to and from an optical disc, and to a slider control method. Background technique [0002] Some types of optical disc devices for recording signals to and reading signals from an optical disc perform tracking control of a slider during tracking servo operation so that an objective lens operates near the center of an optical field of view. [0003] The slider is designed to control the pick-up in position so that the objective lens driven in the tracking direction is positionally aligned with the center of the pick-up's optical field of view. [0004] In the slider tracking control, the amount of displacement between the objective lens and the center of the optical field of view is estimated from the level of the low-frequency component of the tracking servo signal used for the tracking operation. [0005] For example, if the level of the low-frequency component o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/085G11B7/00G11B7/09
CPCG11B7/094G11B7/0946G11B7/08582A47K3/022A47K3/10B82Y30/00B82Y40/00
Inventor 铃木雄一
Owner SONY CORP