331 results about "Magnetic interaction" patented technology

A sensor for measuring density of a liquid that comprises a float unit having a sealed hollow casing that contains a first magnet and a strain-gauge unit having a sealed hollow casing that contains a strain gauge and a second magnet arranged coaxially to the first magnet. Coaxiality of the magnets is provided by means of a guide rod installed on the casing of the strain-gauge unit and used to guide the float unit by inserting the guide rod into the central opening of the float unit casing. A characteristic feature of the sensor is that changes in the density of the liquid that cause displacement of the float cause detectable deformations of the strain gauge via forces of magnetic interaction between the first and second magnets without physical contact between the magnets. Since the elements of the sensor are located in sealed casings, they are not subject to damage and do not require maintenance.

A magnetic arrangement is described for an implantable system for a recipient patient. A planar coil housing contains a signal coil for transcutaneous communication of an implant communication signal. A first attachment magnet is located within the plane of the coil housing and rotatable therein, and has a magnetic dipole parallel to the plane of the coil housing for transcutaneous magnetic interaction with a corresponding second attachment magnet.

Electromagnetic motor with a piston that moves linearly with respect to the stator in either direction. Embodiments include a piston internal or external the stator. The piston includes one or more magnetic flux producing elements in all embodiments, with some embodiments having a ferro-magnetic plate on either side of the flux producing element. Further, in all embodiments the stator includes three magnetic flux producing elements with either two coils with one or more magnets therebetween or with the two coils and a coil magnet substitute therebetween. All embodiments provide positive piston return to a center at rest position. In all embodiments the piston is centered with respect to the stator resulting from either magnetic interaction between the piston and stator magnets, or between the piston magnet and the stator magnet substitute coil.

A a touch sensor including a keyboard having a key defining a touch sensing location, wherein the key is responsive to at least one of capacitive and electro-magnetic interactions with a user during a touch event includes control circuitry associated with the key, wherein the control circuitry outputs a control signal, and wherein an amplitude of the control signal is representative of an amount of interaction between the user and the key during a touch event. A controller is connected to the control circuitry and analyzes a variation in the amplitude of the control signal over a time period to identify the touch event.

A thin-film magnetic device comprises, on a substrate, a composite assembly deposited by cathode sputtering and consists of a first layer made of a ferromagnetic material with a high rate of spin polarisation, the magnetisation of which is in plane in the absence of any electric or magnetic interaction, a second layer made of a magnetic material with high perpendicular anisotropy, the magnetisation of which is outside the plane of said layer in the absence of any electric or magnetic interaction, and coupling of which with said first layer induces a decrease in the effective demagnetising field of the entire device, a third layer that is in contact with the first layer via its interface opposite to that which is common to the second layer and made of a material that is not magnetic and not polarising for electrons passing through the device.

The present invention generally relates to the field of magnetic devices for memory cells that can serve as non-volatile memory. More specifically, the present invention describes a high speed and low power method by which a spin polarized electrical current can be used to control and switch the magnetization direction of a magnetic region in such a device. The magnetic device comprises a pinned magnetic layer with a fixed magnetization direction, a free magnetic layer with a free magnetization direction, and a read-out magnetic layer with a fixed magnetization direction. The pinned magnetic layer and the free magnetic layer are separated by a non-magnetic layer, and the free magnetic layer and the read-out magnetic layer are separated by another non-magnetic layer. The magnetization directions of the pinned and free layers generally do not point along the same axis. The non-magnetic layers minimize the magnetic interaction between the magnetic layers. A current is applied to the device to induce a torque that alters the magnetic state of the device so that it can act as a magnetic memory for writing information. The resistance, which depends on the magnetic state of the device, is measured to thereby read out the information stored in the device.

A guided medical propulsion capsule driven by strong electro-magnetic interaction between an external AC/DC magnetic gradient-lobe generator and a set of uniquely magnetized ferrous-conductive elements contained within the capsule. The capsule is navigated through the lumens and cavities of the human body wirelessly and without any physical contact for medical diagnostic, drug delivery, or other procedures with the magnetically guiding field generator external to the human body. The capsule is equipped with at least two sets of magnetic rings, disks and/or plates each possessing anisotropic magnetic properties. The external magnetic gradient fields provide the gradient forces and rotational torques on the internal conductive and magnetic elements needed to make the capsule move, tilt, and rotate in the body lumens and cavities according to the commands of an operator.

A homopolar machine produces an axial counter force on the rotating shaft to compensate for the load on the shaft's thrust bearing to reduce wear and noise and prolong bearing life. The counter force is produced through magnetic interaction between the shaft and the machine's field coils and is created by changing the current excitation of the field coils, which results in a magnetic flux asymmetry in an inner flux return coupled to the shaft. The homopolar machine may also have a configuration that uses current collectors that maintain substantially constant contact pressure in the presence of high magnetic fields to improve current collector performance. The current collectors are flexible and may be made from either electrically conductive fibers or stacked strips such that they bear up against the armature so that the pressure is maintained by the spring constant of the current collector material. The homopolar machine may also have a configuration where the brushes are oriented so that the current is aligned as much as is practical with the local magnetic field lines so as to reduce the lateral electromagnetic forces on the brushes.

A magnetic lock device includes a first element and a second element that are capable of being detachably coupled together by attracting each other magnetically under the magnetic interaction of permanent magnets, wherein each of the first and second elements includes an annular permanent magnet having a center bore through it, a ferromagnetic disk-like plate disposed to make contact with the permanent magnet, and a ferromagnetic projecting member extending from the disk-like plate and through the center bore of the permanent magnet. All of the component parts for the first and second elements are covered with any suitable synthetic resin film, sheet or the like and shielded from the outside, so that any foreign matter such as dust, particularly ferromagnetic particles like iron, cannot enter the gap or space that is present between the outer peripheral wall of the projecting member and the inner peripheral wall of the center bore through the annular permanent magnet. In one specific form of the magnetic lock device, each of the first and second elements is entirely covered with any suitable non-magnetic, synthetic resin film, sheet, covering or casing, or is entirely covered with a coating of any suitable non-magnetic, synthetic resin layer. In another specific form, each of the first and second elements is covered with any suitable non-magnetic, synthetic resin film, sheet, covering or casing, or is covered with a coating of any suitable non-magnetic, synthetic resin layer, except for the ends of the ferromagnetic projecting members in the first and second elements engaging each other that remain uncovered or exposed. In both forms, each of the first and second elements includes an annular permanent magnet, wherein one annular permanent magnet has a given polarity (S or N) opposed to the polarity (N or S) of the other annular permanent magnet on the side on which the first and second elements are to engage each other.

A rotary blood pump comprising an impeller suspended hydrodynamically within pump housing by thrust forces generated by said impeller during movement in use of said impeller as it rotates about an impeller axis, and the driving torque of said impeller is derived from the magnetic interaction between permanent magnets within the blades of said impeller and windings within said housing, and wherein said windings are encapsulated by a first fluid resistant polymer material, and said housing is at least partially made of a second polymer material that encapsulates said first polymer material.

Novel stands for tablet computers and other electronic devices. A stand for a tablet may comprise a body having one or more attachment mechanisms at one location and a crossbar at a second location. The crossbar may comprise a portion of a first material disposed to magnetically interact with a portion of a second material that is provided by the tablet. The magnetic interaction may cause the crossbar to serve as one or more detents that movably affixes the stand in a desired position relative to the tablet.

A rotatable wheel for an input device which interfaces with a computer. The input device includes both a permanent magnet and an electromagnet. A rotor of material which will magnetically interact with the permanent magnet and electromagnet is coupled to the rotatable wheel. The permanent magnet and electromagnet can be used to control a ratchet force applied to the rotatable wheel. In an alternate embodiment, a rotatable wheel with a flywheel is engaged with a roller. A ratchet wheel can be intermittently engaged with the flywheel to provide a ratchet force. By disengaging the ratchet wheel, the flywheel can be allowed to spin, providing momentum to allow for easier scrolling in certain conditions, such as for scrolling through a long document.

A carrier is sized and configured for placement in or on a tissue region. The carrier includes at least one interior compartment. At least one ferromagnetic material is carried within the compartment. The compartment and the ferromagnetic material are mutually sized and configured to allow movement of the ferromagnetic material within the compartment in response to magnetic interaction with a magnetic material located outside the carrier. The magnetic interaction can include either a magnetic attracting force or a magnetic repelling force. The carrier can be used in association with a source of magnetism sized and configured for placement in or on a tissue region outside the carrier for magnetic interaction with the ferromagnetic material carried within the compartment, e.g., to stabilize the orientation of a tissue region within an airway.

A magnetic recording medium comprises a magnetic recording layer 63 which is formed by using an ordered alloy containing B on a substrate 1 containing an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer 63, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer 63, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layer 63 is also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy. According to the present invention, it is possible to provide the magnetic recording medium for high density recording which is excellent in thermal stability and which involves low medium noise.

A toy block includes a body having external faces. A compartment is located behind each of the external faces and houses a magnet located freely within the compartment and adapted to turn upon magnetic interaction with another magnet external of the body so as to align attractively therewith. Two such toy blocks can be brought together face-to-face in any orientation and the magnet of one block will turn automatically into N-S alignment with a magnet of the other block so that the blocks attract and connect.

A magnetic drive apparatus includes first and second magnet carriers carrying first and second permanent magnet arrangements. An intermediate magnet carrier disposed between the first and second magnet carriers carries a third permanent magnet arrangement. The magnet carriers are arranged for rotation relative to each other such that the magnet arrangements produce magnetic interactions that result in power stroke forces causing the magnet carriers to undergo relative reciprocation in first and second stroke directions during power zone portions of the relative rotation. The magnetic interactions impart substantially no power stroke forces during dead zone portions of the relative rotation. The dead zones include magnet carrier relative rotation positions wherein opposing magnetic poles are mutually coaxially aligned but produce a substantially equal balance of push and pull magnetic forces. The apparatus may be synchronized so that the dead zones coincide with top dead center and bottom dead center relative reciprocation positions.