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Optical disk data accessing device and method for correcting and adjusting optical head inclining anyle

A technology of data access device and tilt angle, which is applied in the direction of optical recording/reproduction, data recording, information storage, etc., to achieve the effect of reducing the amount of jitter

Inactive Publication Date: 2004-03-24
MEDIATEK INC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned structure can measure the inclination of the optical head for optimal focus and tracking, it is necessary to use the displacement detected by the displacement detector

Method used

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  • Optical disk data accessing device and method for correcting and adjusting optical head inclining anyle
  • Optical disk data accessing device and method for correcting and adjusting optical head inclining anyle
  • Optical disk data accessing device and method for correcting and adjusting optical head inclining anyle

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Embodiment Construction

[0037] The optical disc data access device and optical head tilt angle correction and adjustment method of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] Figure 4 It is a control block diagram of the optical disc data access device of the present invention. As shown in the figure, the tilt control module 40 of the optical disc data access device of the present invention is used to control the tilt of the optical head of the optical module 41, thereby effectively reducing the jitter of the reproduced signal. The tilt control module 40 includes a regeneration signal generation unit 42 , a shake detector 43 , a tilt control unit 44 , a tilt driver 45 , and a memory 46 .

[0039]The reproduced signal generating unit 42 is used for converting a radio frequency (Radio Frequency, RF) signal generated by the optical head into an EFM (Eight to Fourteen Modulation) signal, for example, using a slicer to cut out 0 and 1 sig...

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Abstract

The invention discloses a kind of optical disk data accessing device, has an optical head tilt control module, which is used to control the tilt quantity, decreases flutter of regenerate signal. The optical tilt control module includes regenerate signal generating unit, which is used to receive the radio frequency signal generated by the optical head, and generates EFM signal; flutter examining device, receives EFM signal, and examines the flutter of EFM signal; tilt control unit, which is used to correct tilt control value, and selects better value, in adjusting period it generates the tilt control value according to regenerate data; and tilt driver for receiving tilt control value and generates tilt control signal to drive optical head to rotate.

Description

technical field [0001] The present invention relates to an optical disc access device, in particular to an optical disc access device and an optical disc access device which reduces the jitter (jitter) of the read EFM (eight to fourteen modulation) signal by adjusting the tilt angle (tilt) of the optical head. Head tilt angle adjustment method. Background technique [0002] The optical pickup of the optical recording and reading device needs an actuator to adjust the object lens so that the information read or recorded by the optical device, such as EFM (Eight to Fourteen Modulation) signal, can Stronger (robust). The adjuster can move the optical head precisely to the desired position (angle). However, when the optical disc to be read or recorded is curved, or the tilt angle of the optical head is incorrect, the read or recorded information will deteriorate. In order to compensate for the information deterioration, it is necessary to measure the relative inclination angl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/095
Inventor 周文得谢坤宏郑仲皓
Owner MEDIATEK INC
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