US Patent 10459192 Driving unit, optical unit, imaging apparatus, and endoscope

A driving unit includesa tubular fixed part with a given axis as center,a movable part located inside the fixed part and having the axis as center,a front frame part attached to the fixed part and including at least a magnetic material, anda voice coil motor capable of moving the movable part relatively with respect to the fixed part in the axial direction by a coil wound around an outer circumference of the fixed part and a magnet located in the movable part, wherein the magnet of the movable part is biased by the magnetic material, and an axial width of the coil is longer than an axial width of the magnet.