The invention relates to an optical zoom device (1) Optical zoom device (1), comprising a first lens assembly (2), and a second lens assembly (3) following the first lens assembly (2) in the direction of an optical axis (A) of the optical zoom device (1) so that light (L) can pass through the first lens assembly (2) and thereafter through the second lens assembly when travelling along the optical axis (A), wherein said lens assemblies each comprise a focus-adjustable lens (31, 32) as well as an electropermanent magnet (107, 207) or a shape memory alloy (120, 220) for actuating the respective lens (31, 32).

The present invention provides a magnetic movement path control device including: a magnetic force moving unit including a permanent magnet generating a permanent magnetic force, a first pole piece attached to a first surface of the permanent magnet, and a second pole piece attached to a second surface of the permanent magnet; a first outer pole piece in contact with the magnetic force moving unit to form a magnetic path; a second outer pole piece in contact with the magnetic force moving unit to form a magnetic path different from the magnetic path formed by the first outer pole piece; and a magnetic path control member releasing or generating the magnetic path by allowing the magnetic force moving unit to come into contact with the first outer pole piece and be spaced apart from or come in contact with the second outer pole piece, wherein the magnetic force moving unit moves between a first position where at least one of the first pole piece and the second pole piece is in contact with the first outer pole piece and the second pole piece is spaced apart from the second outer pole piece to drop a target object and a second position where at least one of the first pole piece and the second pole piece is in contact with the first outer pole piece and the second pole piece is in contact with the second outer pole piece to lift the target object.

Magnetic coupling devices are disclosed which may be configured in at least three states. The various states may be provided through one or more of altering a position of a permanent magnet relative to another permanent magnet and altering a current level in a coil surrounding a permanent magnet.

Embodiments of the present disclosure relate to methods and systems for switching a magnetic field external to a magnet assembly having two permanent magnets, including a fixed permanent magnet portion and a switching permanent magnet portion, where a switching magnetic field is used to switch the magnetization of the switching permanent magnet portion, but not switch the magnetization of the fixed permanent magnet portion. In this way, the fixed permanent magnet portion has a fixed magnetization, such that the direction of magnetization of the fixed permanent magnet portion remains the same during switching of the magnetization of the switching permanent magnet portion, and the switching permanent magnet portion has a switching magnetization, such that the direction of magnetization of the switching permanent magnet portion is switched during switching of the magnetization of the switching permanent magnet portion.

A locking knife holder uses either mechanical or electronic locking systems to secure the knives into the holder. The electronic locking system includes the implementation of one or more electromagnets into the holder. The user can then selectively lock or unlock the knives in the holder by activating or deactivating, respectively the electromagnet. In other implementations, the mechanical locking system can use magnetic keys to unlock the mechanical locking system.

Provided display device includes at least one magnetic component, first display segment and second display segment connected to each other and foldable towards each other. The magnetic component includes first magnetic module located in non-display region of first display segment and second magnetic module located in non-display region of second display segment. The display device includes first folded state in which contact ends come into contact and second folded state in which the contact ends in contact for period of time. The attractive force A of the first magnetic module to the second magnetic module in the first folded state is smaller than the attractive force B thereof in the second folded state. The preceding solution can prevent the user's hands from being gripped when the user folds the display device and can ensure that the display device maintains stable folded state.

A system comprises an industrial enclosure, first and second magnetic controls in close proximity to one another, and a magnetic field sensor. The first and second magnetic controls are secured to an outer surface of a cover of the industrial enclosure without penetrating an inner surface of the cover. The magnetic field sensor within the industrial enclosure senses a characteristic of the first magnetic control and a characteristic of the second magnetic control, and generates a signal corresponding to each of the characteristics. The signal is used by a controller to identify a setting of each of the first and second magnetic controls. Each of the first and second magnetic controls are positioned proximate to one another and each has a polarity and/or magnetic field strength that does not interfere with the detection of the others respective characteristic.

An apparatus and method are provided for implementing feedback control of the electropermanent magnets and also collecting information about magnetic fields emanating from a volume of interest containing a living being

The present invention provides a magnetic movement path control device including: a magnetic force moving unit including a permanent magnet generating a permanent magnetic force, a first pole piece attached to a first surface of the permanent magnet, and a second pole piece attached to a second surface of the permanent magnet; a first outer pole piece in contact with the magnetic force moving unit to form a magnetic path; a second outer pole piece in contact with the magnetic force moving unit to form a magnetic path different from the magnetic path formed by the first outer pole piece; and a magnetic path control member releasing or generating the magnetic path by allowing the magnetic force moving unit to come into contact with the first outer pole piece and be spaced apart from or come in contact with the second outer pole piece, wherein the magnetic force moving unit moves between a first position where at least one of the first pole piece and the second pole piece is in contact with the first outer pole piece and the second pole piece is spaced apart from the second outer pole piece to drop a target object and a second position where at least one of the first pole piece and the second pole piece is in contact with the first outer pole piece and the second pole piece is in contact with the second outer pole piece to lift the target object.

A magnetic resonance device for monitoring growth of tissue in one or more bioreactors. The device can include a first magnet and a second magnet that can form a uniform magnetic field of desired strength around at least one sample of effluent from at least one bioreactor. At the command of a controller, an RF signal can illuminate the at least one magnetized sample, and sensors can detect at least one echo signal from the at least one magnetized sample. The controller can characterize the at least one sample based on the at least one echo signal. A resonator can shape the at least one echo signal.