An actuator includes a movable body provided with a magnet, a support body provided with a case and a coil assembly, a connecting body to be connected to the movable body and the support body, and a magnetic drive circuit. The coil assembly includes a first plate. The case includes a first case member, and a second case member. The coil assembly is positioned in a Z direction by fitting a protruding plate portion protruding from an edge of the first plate to an outer peripheral side into a first cutout concave portion provided in an edge of the first case member, and a second cutout concave portion provided in an edge of the second case member, and abutting a curved portion provided on an edge of each of the cutout concave portions against the protruding plate portion from both sides in the Z direction.

An actuator includes a movable body, a support body provided with a case that houses the movable body and a coil assembly, a first connecting body and a second connecting body to be connected to the movable body and the support body, and a magnetic drive circuit that vibrates the movable body with respect to the support body in an X direction. The coil assembly includes a first plate that overlaps the coil from a Z1 direction, and a second plate that overlaps the coil from a Z2 direction. The first plate includes a notch portion that comes into contact with a short side portion of the coil from an outer peripheral side, and positions the coil by the notch portion.

An actuator includes a first damper member and a second damper member that couple a movable body and an immovable body and each include a gel member in a tubular form. The gel member has a first end face and a second end face that are different from each other in cross-sectional shape. The first damper member and the second damper member are oppositely oriented in the axial direction, and are opposite from each other in position of the first end face and the second end face. Consequently, the characteristic variance due to the difference in the direction, in which the movable body moves, is reduced or removed in the actuator as a whole, even if each single damper member is involved with such characteristic variance.

An actuator handpiece for a neuromuscular stimulation device is described, said handpiece comprising: a head intended to come into contact with a body surface of a patient to be treated with a predetermined application frequency, said head being mounted on one end of a sliding rod having an opposite end provided with a magnet; a coil and an electronic board connected electrically to the coil and designed to generate a magnetic field for the alternating displacement of the magnet and therefore the head between a distal position, in which the head is intended to exert pressure on the body surface, and a proximal pressure-reducing or release position. A Teflon support structure of the coil is housed above a perforated steel plate situated in a plane defined inside a body of the actuator handpiece, the perforated plate being situated around a cylindrical wall of the support structure which, internally, defines a sliding seat for the magnet.

An actuator handpiece for a neuromuscular stimulation device is described, said handpiece comprising: a head intended to come into contact with a body surface of a patient to be treated with a predetermined application frequency, said head being mounted on one end of a sliding rod having an opposite end provided with a magnet; a coil and an electronic board connected electrically to the coil and designed to generate a magnetic field for the alternating displacement of the magnet and therefore the head between a distal position, in which the head is intended to exert pressure on the body surface, and a proximal pressure-reducing or release position. A Teflon support structure of the coil is housed above a perforated steel plate situated in a plane defined inside a body of the actuator handpiece, the perforated plate being situated around a cylindrical wall of the support structure which, internally, defines a sliding seat for the magnet.

A tattoo machine includes a tubular housing and an electromagnetic assembly disposed in the tubular housing. The electromagnetic assembly includes a first through-hole extending axially therethrough. A magnet unit is disposed in the first through-hole and includes a second through-hole extending axially therethrough. A core bar extends through the second through-hole and includes a tattoo needle on an end thereof. The tattoo needle can be actuated by the magnet unit to an exposed position outside of a bottom end of the tubular housing. An electric power transmission unit is electrically connected to the electromagnetic assembly. The electric power transmission unit can be in electrical connection with a power grid or a power supply and can output alternating current to the electromagnetic assembly.

For efficient presentation of pseudo force sense, a pseudo force sense generation apparatus includes: a base mechanism; and a contact mechanism that performs periodical asymmetric motion relative to the base mechanism and gives force based on the asymmetric motion to skin or mucous membrane with which the contact mechanism is in direct or indirect contact. A mass of the contact mechanism is smaller than a mass of the base mechanism, or the mass of the contact mechanism is smaller than a sum of the mass of the base mechanism and a mass of a mechanism that is attached to the base mechanism.

For efficient presentation of pseudo force sense, a pseudo force sense generation apparatus includes: a base mechanism; and a contact mechanism that performs periodical asymmetric motion relative to the base mechanism and gives force based on the asymmetric motion to skin or mucous membrane with which the contact mechanism is in direct or indirect contact. A mass of the contact mechanism is smaller than a mass of the base mechanism, or the mass of the contact mechanism is smaller than a sum of the mass of the base mechanism and a mass of a mechanism that is attached to the base mechanism.

A haptic engine includes a haptic actuator having a double-wound driving coil in which the two windings are connected with each other either in series or in parallel. By using the double-wound driving coil in which the two windings are connected with each other in series, an instant back EMF voltage induced in either of the two windings can be determined without having to measure in real time a resistance of the corresponding winding, and without having to sense a driving current through the double-wound driving coil. By using the double-wound driving coil in which the two windings are connected with each other in parallel, an instant back EMF voltage induced in 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 haptic actuator having a double-wound driving coil in which the two windings are connected with each other either in series or in parallel. By using the double-wound driving coil in which the two windings are connected with each other in series, an instant back EMF voltage induced in either of the two windings can be determined without having to measure in real time a resistance of the corresponding winding, and without having to sense a driving current through the double-wound driving coil. By using the double-wound driving coil in which the two windings are connected with each other in parallel, an instant back EMF voltage induced in either of the two windings can be determined without having to measure in real time a resistance of the corresponding winding.