A VOICE COIL ACTUATOR HAVING A FLUX GUIDE AT BOTH ENDS

摘要

A voice coil actuator having a magnetic core comprising a plurality of permanent magnets separated by a plurality of pole pieces. The polarity of the permanent magnets alternate such that the north and south poles of the magnets adjacent to the pole pieces face each other. The magnetic core is encased in a cylindrical shell that has a magnetic flux guide at both ends. A cylindrical moving coil is installed in an air gap between the magnetic core and the shell and is captured between the two flux guides. Members are attached to the coil and extend through holes in one of the flux guides.