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Optical Pick-up apparatus, optical disc appartus and tracking control method thereof

An optical pickup, optical disc technology, applied in the direction of recording/reproducing, head configuration/installation, instruments, etc. by optical methods, can solve the problems of poor recording performance, inability to eliminate offset, tracking instability, etc., to improve recording performance , the effect of reducing manufacturing costs

Inactive Publication Date: 2004-06-30
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when recorded, they have different magnitudes, thus the offset cannot be eliminated
This produces a tracking servo error signal including offset, which in the worst case of its de-tracking causes certain troubles, i.e. tracking is unstable and makes recording performance worse

Method used

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  • Optical Pick-up apparatus, optical disc appartus and tracking control method thereof
  • Optical Pick-up apparatus, optical disc appartus and tracking control method thereof
  • Optical Pick-up apparatus, optical disc appartus and tracking control method thereof

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Embodiment Construction

[0034] The present invention is devised in a relatively simple manner to eliminate inconvenience under the circumstances described above, and it is an object of the present invention to provide an optical pickup device that allows stable tracking control, an optical disc device using such an optical pickup device, and an optical disc device for the optical disc device. Tracking control method, when the side beam is not set at the center of each SPD, the optical pickup device can eliminate the offset during recording.

[0035] An optical pickup device embodying the present invention is described in more detail with reference to the accompanying drawings.

[0036] The present invention is embodied in an optical pickup device 10 shown in FIG. 1, which is a device for recording information on and / or reproducing information from a rotationally driven optical disc.

[0037] The optical pickup device 10 includes a laser diode (light source) 1 , a diffraction grating 2 , a beam splitt...

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Abstract

After making such adjustment that an MPP offset can be made zero when main beam is positioned at the center of main photoreceptor, using electric signals E and F photo-electrically converted by one of two-divided side beam photoreceptors and electric signals H and G photo-electrically converted by the other thereof, a side push-pull signal SPP including a constant alpha determined for allowing respective (F-alphaE) and (alphaH-G) offsets to be made zero is calculated according to a formula, SPP=(F-alphaE)+(alphaH-G). From this SPP signal and the main push-pull signal MPP, a differential push-pull signal DPP is then calculated, thereby allows the tracking control to be carried out. Thus, stable tracking control can be obtained even during recording.

Description

technical field [0001] The present invention relates to an optical pickup device, an optical disc device using the optical pickup device, and a tracking control method for controlling tracking of the optical disc device. [0002] More particularly, the present invention relates to optical pickup devices and the like, wherein if a differential push-pull signal is calculated from a main beam and a pair of side beams reflected from an optical disc when information is recorded on and / or reproduced from an optical disc, The main push-pull signal is then adjusted so that the main push-pull offset is zero when the main beam is disposed at the center of the main light detection system and a pair of side beams are disposed on either side of the main beam and they are symmetrical about the main beam; and then, The constant α is set in advance so that the offset of the side push-pull signal is respectively zero, whereby the offset of the side push-pull signal can be eliminated even when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/095
CPCG11B7/0903G11B7/094G11B7/0943G11B7/09
Inventor 丸山务汤浅正美
Owner SONY CORP