Patent ID: 6787943
Filing Date: 2004-09-07
Classification: H01F,H02K

Abstract:
A linear voice coil actuator includinga plurality of field subassemblies each comprising a field blank, wherein at least a first one of the plurality of field subassemblies includes a plurality of magnets of alternating polarity positioned on the field blank to form interleaved-magnetic circuits in a direction of motion of the linear voice coil actuator, wherein each of the plurality of magnets has opposing ends which are substantially parallel to the direction of motion; and further wherein the plurality of field subassemblies are positioned with respect to one another to form a gap between the first one of the plurality of field subassemblies which includes the plurality of magnets, and another of the plurality of field subassemblies, and to provide at the opposing ends of the magnets a transverse flux path through the field blanks in a plane transverse to the direction of motion, and a coil assembly that includes coils positioned in a plane within the gap, wherein the plane is substantially parallel to the direction of motion of the linear voice coil actuator; and wherein the plurality of magnets are magnetized in directions perpendicular to the direction of motion of the linear voice coil actuator.