Patent ID: 7659641

Claim:
A moving magnet type linear slider, comprising: a linear motor placed opposite to a fixed base in parallel, the linear motor having a field constituting a movable unit and an armature constituting a stator; a linear guide including a guide rail and a guide block, the guide rail and the guide block being configured to support and guide the movable unit of the linear motor; and a detector for detecting a relative position of the movable unit and the fixed base, wherein the movable unit is configured to be reciprocated with respect to the fixed base along a longitudinal direction of the guide rail, wherein the field of the linear motor is constituted by a magnet track including a horizontally arranged generally U-shaped magnetic yoke disposed on the guide block and plural pairs of field permanent magnets arranged on inner opposed surfaces of the magnetic yoke with polarities arranged alternately in a longitudinal direction of the magnetic yoke, each pair of the filed permanent magnets being arranged with opposite polarities faced with each other, wherein the armature of the linear motor is constituted by an armature holder upwardly extended from one side of the fixed base, and a planar coreless armature coil perpendicularly extended from the armature holder so as to be arranged between the pairs of field permanent magnets via magnetic gaps, and wherein the detector is constituted by a linear scale attached to a lower surface of a bottom of the magnetic yoke so as to be located at an opposite side of an opening portion of the magnetic yoke, and a sensor head attached to an upper surface of the fixed base so as to be located at an opposite side of an armature holder so that the sensor head faces the linear scale.