Patent ID: 8629745

Claim:
An electromagnetic actuator comprising: a stationary magnetic member; a moveable magnetic member moveable from a first position to a second position in response to a magnetic field linking the stationary magnetic member and the moveable magnetic member; an actuator coil disposed to cause a magnetic field linking the stationary magnetic member and the moveable magnetic member as a result of a current in the actuator coil; the actuator coil being formed by the interconnection of conductive coils on each of multiple layers of a multiple layer printed circuit board, the multilayer printed circuit board having a stacked plurality of circuit boards, each with a printed coil thereon, the coils on the stacked plurality of circuit boards being interconnected by plated through holes in the plurality of circuit boards to form the actuator coil; the stationary magnetic member and moveable magnetic member when in the second position, defining a magnetic circuit having a zero non-ferromagnetic gap.