Optical pickup

Abstract

An optical pickup is provided for driving objective lenses in focusing and radial directions. The pickup includes a movable member, and objective lenses at the center portion of the movable member. The pickup also includes coil blocks provided at two side portions of the movable member, and pairs of magnets flanking the coil blocks in a tangential direction perpendicular to the focusing and radial directions. Support members are attached to the side portions of the movable member, permitting the movable member to move in the focusing direction and the radial direction. Each coil block includes focusing and tracking coils for driving the movable member in the focusing direction and the radial direction. The center portion of the movable member, below which a reflector is arranged, is thinner than the side portions of the movable member.

Description

technical field [0001] The present invention relates to an optical disc device for recording on and reproducing from an optical disc, and more particularly, to an optical pickup in the optical disc device. More particularly, the present invention relates to an optical pickup equipped with a plurality of objective lenses to enable recording and reproduction on various types of optical discs having different optical characteristics. Background technique [0002] Various structures of optical pickups for optical disc apparatuses have been devised to enable recording and reproduction on various optical discs having different optical characteristics. In particular, due to the advent of the Blu-ray Disc as a high-density recording medium, an optical disc apparatus capable of recording on Blu-ray Discs (HD-DVD and Blu-ray Disc) other than conventional Red Discs (CD and DVD) will be sought in the future. ) and reproduced from it. [0003] In order to be able to record on and repro...

AI Technical Summary

Problems solved by technology

[0013] However, there is such a problem that if the magnetic circuit is made compact, the driving performance in the focus direction or radial direction decreases, the power consumption increases, and the tracking accuracy decreases, making it difficult to have a compact design for the magnetic circuit

[0014] In addition, the size of the fixed mirror depends on the effective diameter of the objective lens; as a condition of optical design, the width of the laser beam reflected by the fixed mirror must be larger than the effective diameter of the objective lens, making the size reduction and thin design of the fixed mirror particularly difficult to achieve

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