Objective-lens driving apparatus, optical pickup and optical disk apparatus

Abstract

The present invention provides an objective-lens driving apparatus in which the phase delay is small in focusing-response characteristic and which excels in resonance characteristic in high-frequency bands. The objective-lens driving apparatus includes a movable unit that has a lens holder holding an objective lens, a fixed unit that is spaced apart from the movable unit in a tangential direction, elastic support members that support the movable unit, enabling the movable unit to move with respect to the fixed unit in the focusing direction and tracking direction and to incline in a tilt direction, a first magnet, and a second magnet that is magnetized in a direction opposite to a magnetization direction of the first magnet. The lens holder has tracking coils, focusing coils, a first tilt coil that is wound around an axis extending in the focusing direction and generates drive forces acting in the tilt direction, and a second tilt coil that is wound around in a direction opposite to the winding direction of the first tilt coil, and generates drive forces acting in the tilt direction.

Description

technical field [0001] The invention relates to an objective lens driving device, an optical pick-up using the objective lens driving device and an optical disc device. The above-mentioned objective lens driving device is used for an optical pickup for recording and / or reproducing information recording media such as optical discs. direction action. Background technique [0002] An optical pickup device for recording and reproducing information signals on an information recording medium such as an optical disk includes an optical pickup that moves in the radial direction of the optical disk and irradiates the optical disk with laser light. [0003] An objective lens drive device is provided in the optical pickup, and the focus adjustment and tracking adjustment are performed by the objective lens drive device, and the light spot of the laser light irradiated on the optical disc through the objective lens is adjusted, so that the laser light spot irradiated on the optical dis...

AI Technical Summary

Problems solved by technology

Therefore, in the focus response characteristic, the phase delay caused by the inductance component is large, which may cause problems in servo design in high-speed recording and reproducing devices.

[0012] Additionally, if Figure 17 As shown, in the objective lens driving device 101, due to the focusing driving force F S3 Acting in the tracking direction T RK The central part of the center, the focusing thrust is concentrated in the center, which easily causes the resonance mode, that is, the primary bending mode of the movable part is excited, and the resonance peak height increases

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