An electromechanical transducer apparatus for converting between mechanical energy and electrical energy is disclosed and includes first and second magnetic flux generators including pole pieces coupled to direct magnetic flux. Th magnetic flux generators are disposed such that opposite polarity pole pieces are spaced apart in adjacent relation. A pair of reciprocators are coupled for reciprocating movement between the pole pieces and are spaced apart by first and second air gaps. A closing piece completes a magnetic circuit and when the reciprocators are disposed such that the first air gap is smaller than the second air gap, magnetic flux generated by the first magnetic flux generator flows in a first direction via the first air gap through the closing piece. When the reciprocators are disposed such that the second air gap is smaller than the first air gap, magnetic flux generated by the second magnetic flux generator flows in a second opposite direction via the second air gap through the closing piece. A current carrying coil is disposed to electromagnetically interact with the magnetic flux.

A movable body wherein a pair of annular yokes including an opening at a center and a pair of weight parts including a through hole are stacked on a front and rear surfaces of a magnet having a circular plate shape in an axis direction, and another end portion of a connecting part that connects a pair of elastic support parts on one end portion side is disposed in the contiguous opening and through hole; and a fixing body wherein the movable body is housed in a cylindrical part, the movable body is supported with the pair of elastic support parts so as to be allowed to vibrate back and forth in the axial direction, and a pair of annular coils disposed radially outside the movable body is provided are provided, and the movable body is vibrated in the axial direction through energization of the coil.

A movable body wherein a pair of annular yokes including an opening at a center and a pair of weight parts including a through hole are stacked on a front and rear surfaces of a magnet having a circular plate shape in an axis direction, and another end portion of a connecting part that connects a pair of elastic support parts on one end portion side is disposed in the contiguous opening and through hole; and a fixing body wherein the movable body is housed in a cylindrical part, the movable body is supported with the pair of elastic support parts so as to be allowed to vibrate back and forth in the axial direction, and a pair of annular coils disposed radially outside the movable body is provided are provided, and the movable body is vibrated in the axial direction through energization of the coil.

A rotary reciprocating driving actuator includes: a movable member including a shaft part and a magnet; and a fixing body including a core assembly including a magnetic pole core with an integral structure including a plurality of magnetic poles, a plurality of coils disposed next to the plurality of magnetic poles, and a magnetic path core to which the magnetic pole core is assembled, wherein the core assembly is disposed such that the plurality of magnetic poles faces an outer periphery of the magnet, wherein a magnetic flux that passes through a magnetic path configured of the magnetic path core and the magnetic pole core of the integral structure is generated through energization of the plurality of coils, and the movable member is rotated back and forth around an axis of the shaft part through electromagnetic interaction of the magnetic flux and the magnet.

A rotary reciprocating driving actuator includes: a movable member including a shaft part and a magnet; and a fixing body including a core assembly including a magnetic pole core with an integral structure including a plurality of magnetic poles, a plurality of coils disposed next to the plurality of magnetic poles, and a magnetic path core to which the magnetic pole core is assembled, wherein the core assembly is disposed such that the plurality of magnetic poles faces an outer periphery of the magnet, wherein a magnetic flux that passes through a magnetic path configured of the magnetic path core and the magnetic pole core of the integral structure is generated through energization of the plurality of coils, and the movable member is rotated back and forth around an axis of the shaft part through electromagnetic interaction of the magnetic flux and the magnet.

A haptic engine includes a gap-closing actuator having a double-wound driving coil in which the two windings can be activated with two driving sources, respectively. Or, the two windings double-wound driving coil can be activated with a single driving source when the two windings are connected with each other either in series or in parallel. By using the double-wound driving coil in the gap-closing actuator as described, an instant inductance of either of the two windings can be determined without having to measure in real time a resistance of the corresponding winding.

A haptic engine includes a gap-closing actuator having a double-wound driving coil in which the two windings can be activated with two driving sources, respectively. Or, the two windings double-wound driving coil can be activated with a single driving source when the two windings are connected with each other either in series or in parallel. By using the double-wound driving coil in the gap-closing actuator as described, an instant inductance of either of the two windings can be determined without having to measure in real time a resistance of the corresponding winding.

A segmented alphanumeric includes a display panel, at least one linearly actuated platform, and display elements. Each display element passes through an orifice in the display panel to generate protruded and segmented alphanumeric characters in combination with other extended display elements. A microactuator array is displaceable by the linearly actuated platform and includes electromagnets and rotors. Each rotor is mounted for rotation in at least one direction between an active state and an inactive state by at least one associated electromagnet. Each display element is displaced through the orifice by actuation of the linearly actuated platform via a respective rotor when the respective rotor is rotated into its active state and to evade displacement by the rotor when the rotor is rotated into its inactive state.

A linear actuator, and a tufting machine including the linear actuator are provided. The linear actuator includes a casing, a magnet unit, and a coil unit. The magnet unit includes a magnet and a magnet mounting plate. The magnet is configured to sandwich side surfaces of the magnet mounting plate. The coil unit faces the magnet. The magnet unit is configured to reciprocate along an axial direction in the casing, between the coil unit, based on magnetization and demagnetization of the coil unit.

A linear actuator, and a tufting machine including the linear actuator are provided. The linear actuator includes a casing, a magnet unit, and a coil unit. The magnet unit includes a magnet and a magnet mounting plate. The magnet is configured to sandwich side surfaces of the magnet mounting plate. The coil unit faces the magnet. The magnet unit is configured to reciprocate along an axial direction in the casing, between the coil unit, based on magnetization and demagnetization of the coil unit.