Disc device and semiconductor integrated circuit and pick-up control method and vibration component test method

Abstract

A disc device and semiconductor integrated circuit and pick-up control method and vibration component test method are provided. An optical disk device is provided with a multiplication means for generating a focus vibration component FC from the focus error signal FE, a multiplication means for generating a tracking vibration component TC from the tracking error signal TE, an adder for adding the focus vibration components FC and TC, and a low-pass filter for extracting the vibration component VC from the added results. Thus, the vibration component VC is extracted considering not only vibrations in the tracking direction but also vibrations in the focus direction, so that vibrations acting on the device can be more accurately detected, and vibration resistance is increased. Tereby, it can increase the vibration resistance of an optical disk device with respect to vibrations in the focus direction.

Description

technical field [0001] The invention relates to an anti-vibration technology of an optical disk device, in particular to a technology for preventing the focus and tracking deviation of a pick-up head caused by external vibrations. Background technique [0002] In an optical disc device, in order to reproduce signals with high quality, it is desirable that the laser light spot is always kept in the best focus and best tracking state with respect to the signal storage surface. However, due to the mechanical precision of the disk rotation mechanism, the plane precision of the disk itself, and external interference factors, etc., there will be a certain degree of variation in the focus direction orthogonal to the signal storage surface and the track direction orthogonal to the track travel direction. vibration. Therefore, generally, an optical disk device has a focus operation mechanism driven in a focus direction and a tracking operation mechanism driven in a track direction w...

AI Technical Summary

Problems solved by technology

[0012] However, when the optical disc device is used in a portable manner, it may be subject to strong vibration or shock in the focusing direction.

In this case, in the existing optical disc device, there is a problem that the focus servo will be confused, and even the servo control will be lost in severe cases.

[0013] In addition, with the continuous increase in the density of information stored on optical discs in the future, the focal length of the light beam used to read such high-density information is estimated to be shorter and shorter

When the focal length of the light beam is shortened, even small vibrations in the focus direction, which have been negligible until now, have a large influence on the signal reproduction

In this case, it is difficult to ensure sufficient vibration resistance for conventional optical disc devices that detect vibration only from tracking error signals.

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