The plane surface coil and the even linear voice coil actuator which has spring type quality

摘要

The field magnet subassembly (12 and 14) and the coil assembly (16) being the linear coil actuator which it has, the field magnet bank it possesses each field magnet subassembly, one field magnet subassembly includes the plural magnet groups at least. Each group of the magnet, equality or being the plural magnets which have the size which differs, gives 1 magnetic polarities, at the same time, fitting to the load quality of the specification like the spring which has spring constant K in order to give flux density distribution to the air gap, uses the magnet which is arranged. Two field magnet subassemblies (12 and 14), namely, the field magnet subassembly and the other field magnet subassembly which include the above-mentioned plural magnet groups in order to form the air gap between, are arranged in regard to each other, the coil assembly (16) it is movable in that air gap.