An electromagnetic actuator having an actuating permanent magnet and a simplified construction is provided. The electromagnetic actuator includes a housing having a base, a side wall extending from the base to a termination plane, and a substantially open side. The electromagnetic actuator further includes a pole piece arranged within the housing, a wire coil positioned around the pole piece and arranged within the housing, and a permanent magnet coupled to the pole piece by a spring and moveable between a first position and a second position. An actuation position of the permanent magnet between the first position and the second position is proportional to a magnitude of a current applied to the wire coil.

An actuator comprises: a torsion spring fixed to a top yoke as a support member; a permanent magnet coupled to the torsion spring where the permanent magnet is placed with an N-pole and an S-pole thereof across a rotational axis of the torsion spring; a drive circuitry configured to apply a drive signal with periodically varying voltage or current; and a mirror unit comprising a first mirror and second mirrors, the first mirror being near a center of the torsion spring, and the second mirrors being around the first mirror and parallel to the first mirror. A plane including a reflecting surface of the second mirrors is closer to the rotation axis of the torsion spring than a plane including a reflecting surface of the first mirror, and the mirror unit reciprocates in accordance with application of the drive signal.

An electromagnetic actuating device includes an armature, which has a permanent magnet and can move along a longitudinal axis between actuation positions relative to a stationary coil and in reaction to energization, armature has an engagement section for interacting with a plunger, and which armature can move from a first actuation position, which is stable in the currentless state, into a second actuation position against a restoring force of a spring, wherein the coil has a first coil unit, which acts on the armature and which releases the armature from the first actuation position, wherein the coil has a second coil unit which, during movement, applies to the armature a force which accelerates the armature, and wherein the coil has a restoring coil such that when the armature is returned from the second into the first actuation position, the restoring coil boosts the restoring force of the spring.

The present disclosure relates to actuators. Various embodiments may include a laminated magnet armature for an electromagnetic actuating device, an injection valve for metering a fluid, and/or an electromagnetic actuating device having a laminated magnet armature. For example, a laminated magnet armature for an electromagnetic actuating device wherein the magnet armature is displaceable along an axis A in a movement direction may include a multiplicity of interconnected laminations oriented perpendicular to the axis A and stacked to form a lamination stack with a bottom side and a top side. Each lamination includes at least one recess open toward an edge of the lamination. The laminations are arranged within the lamination stack so the recesses form at least one duct extending through the lamination stack from the bottom side to the top side.

A dual coil solenoid valve is disclosed for a fuel gas control valve, which comprises a stationary coil assembly and a moving coil assembly, wherein both the stationary coil assembly and the moving coil assembly consist of a magnetic core and a coil. Grooves are provided on the inside of the magnetic cores and coils are arranged in the grooves of the magnetic cores. The stationary coil assembly and the moving coil assembly have an equal cross-sectional area and are arranged oppositely with their axes coinciding with each other.

A microphone having a housing that includes a bottom part and an upper part, and a transducer element arranged in the housing and which is electrically and mechanically connected to the bottom part. For stress-free mounting of the transducer element, a flexible connecting element is proposed, which is pliable and/or compressible, is arranged between the transducer element and the upper part, and connects the transducer element to the upper part. The connecting element includes a plastic, in which gas bubbles are distributed, the gas bubbles having a volume fraction of between 50 and 98% in the connecting element.

An actuating apparatus having a first actuating unit and a second actuating unit arranged adjacent to the first actuating unit. The actuating units each have elongated tubular coil bodies, actuator coils which are wound around the coil bodies, electromagnetically actuatable actuators which are guided in the coil bodies and are movable relative to the actuator coils, and the coil bodies are D-shaped and face one another with the flattened sides thereof.

An electromagnetic coil through which current is passed to generate a magnetic flux, a fixed core, a movable core, a magnetic spring disposed between the cores and, and a yoke are provided. The magnetic spring includes a magnetic substance, and biases the movable core in a direction in which the movable core is separated from the fixed core in a Z direction. Additionally, the magnetic spring includes a leaf spring member including the magnetic substance and spirally wound, and a central portion of the magnetic spring is located biased toward one side in the Z direction compared to a peripheral portion of the magnetic spring. When the movable core is attracted to the access position, the magnetic spring is prevented from being deformed to a minimum spring length corresponding to a width of the leaf spring member.

A bistable solenoid valve for a hydraulic brake system has a guide sleeve in which an upper immovable pole core is fixedly arranged and a closing element is displaceably arranged. The closing element is forced into a valve seat during a closing movement and lifts off from the valve seat during an opening movement, and is fixedly connected to a magnet assembly. An actuation of the movement of the closing element is performed by the magnet assembly via a coil positioned around and substantially surrounding the guide sleeve. A lower immovable pole core is fixedly arranged in the guide sleeve and the magnet assembly is positioned between the lower and the upper pole core.

A lens driving device according to the present invention is a lens driving device that includes an auto-focus coil and an auto-focus magnet and that moves a movable auto-focus unit including the auto-focus coil in the direction of an optical axis relative to a fixed auto-focus unit including the auto-focus magnet by using a driving force of a voice coil motor constituted of the auto-focus coil and the auto-focus magnet. The fixed auto-focus unit includes a case formed of a non-magnetic material and having a rectangular shape in plan view and a base on which the case is fixed. The auto-focus magnet has the shape of a flat plate disposed on a side face of the case, and at least one of the four side faces of the case is a non-magnet-disposed face, on which the auto-focus magnet is not disposed.