US 2001/0026528 A1 · Apparatus for driving a lens for use with a disk player

Abstract

An apparatus is disclosed for driving a lens for use with a disk player to avoid the swing movement of a movable member without the degradation of the sensitivity of an actuator. The apparatus includes magnetic flux producing elements for providing magnetic flux to tracking coils fixed to a lens holder parallel to a focusing direction. The magnetic flux producing elements provide a first magnetic flux to a first area of the coil and a second magnetic flux to a second area of the coil. The first magnetic flux has a direction opposite to that of the second magnetic flux. At least a portion of a boundary surface between the first and the second areas is inclined from a focus direction of the lens.

Claims9

Dependent claims

An apparatus for driving an objective lens for use with a disk player, comprising a movable lens holder provided with driving coils and the objective lens, and a magnetic flux producing assembly for producing magnetic flux to the driving coils to move the objective lens in tracking and focusing directions of a disk,

wherein the driving coils comprise at least one set of two tracking coils, each of the tracking coils having a flat coil face,
wherein the magnetic flux producing assembly produces a first magnetic flux orthogonal to a coil face of the tracking coil in a first area including a first part of the tracking coil, and a second magnetic flux in a second area including a second part of the tracking coil other than the first part, said second magnetic flux having a direction opposite to that of the first magnetic flux, and
wherein at least a portion of a boundary surface between the first and second areas is inclined from a focusing direction of the objective lens.

Dependencies are inferred from the claim text.

Apparatus for driving a lens for use with a disk player

Life of this patent

Apparatus for driving a lens for use with a disk player

Life of this patent

Abstract

Claims9