2797 results about "Magnetic line" patented technology

An auto-focusing device with voice coil motor for position feedback comprises a lens holder, a sensor holder, a permanent magnet set, a yoke and a base. The lens holder holds a lens barrel and is wound around with at least two coils wound in opposite directions. The sensor holder holds an image sensor. The permanent magnet set includes at least two permanent magnets stacked together with opposing poles to form a multi-pole permanent magnet set. The permanent magnet set is furnished on the periphery of lens holder and corresponds to the two coils on lens holder. The permanent magnet set is disposed on the yoke to form a close-loop magnetism so as to increase the density of magnetic lines and the efficiency of magnetic force, save power consumption, and extend the service life of device.

An optical unit with shake correcting function may include a movable module having a lens, a fixed body supporting the movable module, a shake detection sensor for detecting shake of the movable module, and at least one pair of magnetic drive mechanism for shake correction which is structured on both sides of the movable module so that the movable module is swung with respect to the fixed body on the basis of detection result of the shake detection sensor to correct the shake of the movable module. The magnetic drive mechanism for shake correction is disposed so that a shake correction magnet is held by the fixed body and a shake correction coil is held by the movable module. Further, a shake correction coil may be disposed in a first region, where magnetic lines of force generated by a shake correction magnet are directed in directions generally going away from a supporting point part and/or a second region where magnetic lines of force generated by the shake correction magnet are directed in directions generally going toward the supporting point part.

A coil unit includes a coil formed by winding a coil wire, a wiring substrate, and a magnetic substance for receiving magnetic lines of force generated by the coil. The wiring substrate includes a connection terminal connected to both ends of the coil, an external connection terminal, and a wiring pattern for connecting the connection terminal and the external connection terminal. No circuit element other than the coil is mounted on the wiring substrate.

A closed drift ion source which includes a channel having an open end, a closed end, and an input port for an ionizable gas. A first magnetic pole is disposed on the open end of the channel and extends therefrom in a first direction. A second magnetic pole disposed on the open end of the channel and extends therefrom in a second direction, where the first direction is opposite to the second direction. The distal ends of the first magnetic pole and the second magnetic pole define a gap comprising the opening in the first end. An anode is disposed within the channel. A primary magnetic field line is disposed between the first magnetic pole and the second magnetic pole, where that primary magnetic field line has a mirror field greater than 2.

A high performance voice coil motor comprises: a retaining seat having at least one magnetic unit; a movable seat installed within a receiving space of the retaining seat; the movable seat being installed with at least one coil set; the coil set being interacted with the magnetic unit as current flows through the coil set so that the movable seat moves with respect to the retaining seat; the magnetic unit having four poles so as to increase the density of magnetic lines. Each of four corners of the upper cover is extended with a supporting rod; and each of four sides of the movable seat is installed with a coil set which is adjacent to the magnetic unit. A lower side of the movable seat is installed with two lower elastic sheets; each lower elastic sheet has an electrode plate.

The present invention relates to an apparatus for capturing video footage of a moving object, including a plurality of movable cameras controlled by a control means, the control means being in communication with a tag device attached to said object such that at least one of said plurality of cameras tracks the movement of said object, wherein the position of an image of said object, within a respective camera's picture frame, is biasly influenced by at least one biasing means. The biasing means, may be a point within the camera's picture frame, or a magnetic line traversing at least portion of the camera's picture frame, or a target frame within the camera's picture frame, or a combination thereof. The present invention takes into consideration complex framing and cinematographic composition that provides footage of a race participant, such as a motor racing vehicle in which jerky footage is undesirable.

The invention discloses a vibration generating device of portable electronic equipment, which comprises the following parts: permanent magnet, winding group, moving cavity and charging device, wherein the winding group winds the outer surface of moving cavity, whose two ends fix permanent magnet in the moving cavity movably; the moving permanent magnet moves reciprocally in the moving cavity acted by outer vibration and fixed permanent magnet repulsion, which produces relative movement for winding group; the induction current is generated through cutting magnetic line in the winding group, which provides DC power to charge battery after passing diode and commutating circuit. The invention improves converting efficiency of generating device in the vibration generating course, which reduces bulk greatly to place vibration generating device in the portable electronic equipment conveniently.

A magnetic circuit having a dual magnet, a speaker and a vibration generating apparatus using the same are provided. The magnetic circuit includes a magnetic gap having a small magnetic loss and an increasing magnetic flux density, in which a uniform distribution of a line of magnetic force can be realized on yoke surfaces facing each other. The speaker includes lower and upper magnets which are spaced so that mutually identical polarities oppose each other; a first yoke integrally having a loop-type circulating circuit portion extended from the lower magnet to the upper magnet and an extension portion which is extended perpendicularly upwards from the lower magnet; a second yoke which connects between the lower and upper magnets and forms a magnetic gap between the second yoke and the extension portion of the first yoke; a coil disposed in the magnetic gap and wound around a bobbin; a frame which is extended from the first yoke; a vibrating diaphragm generating an acoustic sound in correspondence to a drive signal; a damper limiting a vibration range of the bobbin; and a center cap covering the bobbin.

An ion withdrawal apparatus that withdraws ions emitted from a plasma in an EUV light production apparatus in which a target at an EUV light production point is irradiated with laser light to be made in a plasma state and the target emits EUV light, the ion withdrawal apparatus which includes: a collector mirror that is disposed in a direction opposite to a laser light incidence direction to collect the EUV light and has a hole for the ions to pass therethrough; magnetic line of force production means that produces a magnetic line of force that is parallel or approximately parallel to the laser light incidence direction at or in the vicinity of the EUV light production point; and ion withdrawal means that is disposed on the opposite side of the collector mirror from the EUV light production point and withdraws the ions.

A permanent magnet fixed to a peripheral portion of a lens cell includes two magnets that are joined together so that the north poles face each other and the south poles are exposed. A first driving coil is arranged to face toward exits for lines of magnetic force from the joining surfaces of the north poles of the permanent magnet, and a second driving coil is arranged to face toward entrances for lines of magnetic force in the permanent magnet. The orientation of the lens is adjusted by adjusting the currents supplied to the first driving coil and second driving coil to drive the lens cell in an optical axis direction and horizontal direction in a state in which the lens cell is levitated relative to the cover.

A micro-electro-mechanical system magnetic field sensor and a measuring method relates to a magnetic field sensor and a measuring method, which have low energy consumption, simple structure, quick response and high reliability. The sensor is composed of an anchor area (1), induced metal wires (2), an E-type cantilever beam (3) and a substrate (4); wherein, the E-type cantilever beam is actuated by the static or driven by the Lorentz force, and is forced to generate the vibration; the cantilever beam generates the resonance under the action of a certain frequency; the induced metal wires (2) which are plated on the E-type cantilever beam (3) can move along with the vibration of the E-type cantilever beam (3). The induced metal wires (2) make the movement of cutting the magnetic lines of force in the magnetic field; thus induced voltage can be induced in the metal wires; the induced voltage in the induced metal wires (3) are measured to achieve the purpose of measuring the magnetic field.

A film formation apparatus includes: a chamber in which both a body to be processed and a target are disposed; a first magnetic field generation section generating a magnetic field; and a second magnetic field generation section including a first generation portion to which a current defined as “Iu” is applied and a second generation portion to which a current defined as “Id” is applied, the first generation portion being disposed at a position close to the target, the second generation portion being disposed at a position close to the body to be processed, the second magnetic field generation section applying the currents to the first generation portion and the second generation portion so as to satisfy the relational expression Id<Iu, the second magnetic field generation section allowing perpendicular magnetic lines to pass between the target and the body to be processed.

A plasma generating apparatus and processing method, which generate high-density plasma, even in the central portion of the plasma generating zone. The apparatus comprises rectangular electrodes, a rectangular fistulous discharge electrode which surrounds the plasma generating zone, and a vacuum chamber of rectangular cross-section. Permanent magnets surround the discharge electrode, produce predetermined magnetic lines of force with portions which extend approximately parallel to the central axis of discharge electrode. A pair of parallel plate electrodes define the extension of the plasma generating zone in the direction of the central axis of the discharge electrode. The apparatus is configured such that the magnetic lines of force passing through the central portion of the plasma generating zone do not intersect with the electrodes.

The invention discloses a rotor assembly for a permanent magnet motor. The rotor assembly comprises a rotor iron core and multiple permanent magnet groups uniformly distributed along the peripheral direction of the rotor iron core; each of the permanent magnet group comprises a first permanent magnet positioned in the middle of the permanent magnet group and second permanent magnets positioned at the end parts of the permanent magnet group, wherein first magnet isolating slots are arranged between the end part edges, away from the first permanent magnet, of the second permanent magnets, and the outer periphery of the rotor iron core; the first magnet isolating slots extend along the outer periphery of the rotor iron core in the extension direction of the permanent magnets. According to the rotor assembly, magnetic fields between stator teeth and the rotor permanent magnets are optimized by the magnet isolating slots, and the reversing of the hysteresis magnetic field is effectively inhibited, so the magnetic field change is reduced and the pulse of the output torque of a motor is reduced; in addition, the magnet isolating slots can be used for reducing the density degree of magnetic lines, so the demagnetizing capacity of the permanent magnets in the rotor assembly is improved. The invention also relates to a permanent magnetic motor comprising the rotor assembly.

The invention relates to an equipment for preparing polymer nanometer fiber with regular arrangement and the method. The equipment comprises a spraying silk tube for containing polymer solution. A spraying nozzle is sealed and assembled at the end of spraying silk tube. The nozzle is connected with the positive electrode of high pressure generator and is used as anticathode. An aluminum foil is connected with the negative electrode of high pressure generator and is used as cathode, which is grounded at the same time. The aluminum foil is set between a first permanence magnet and a second one. The nozzle is faced to the aluminum foil. The electrical spinning method controlled by magnet is that soluble macromolecules are put into the corresponding solvent and the concentration is adjusted, the polymer solution with good performance for spinning is confected; magnetic nanometer grains are put into the polymer solution and magnetized polymer solution is formed. In the electrical spinning equipment controlled by magnet, the magnetized polymer solution becomes micro-nano continuous fiber under the effect of electric field and at the same time fibers are arranged along the direction of magnetic line under the effect of external magnetic field to form micro-nano fiber material with parallel arrangement.

The invention discloses a magnetorheological polishing method and device. The method includes the steps that a workpiece is arranged in magnetorheological fluid with a magnetic field and does motion in at least two degrees of freedom, and therefore the surface of the workpiece is polished. The magnetorheological polishing method is characterized in that in the magnetorheological fluid with the magnetic field, the workpiece does motion in multiple degrees of freedom, under the effect of the gradient magnetic field, as the magnetorheological fluid in the fluid form will become the liquid solid state with the forced bonding elastic effect, a flux linkage formed in the direction of a magnetic line of force will clamp abrasive particles, and it amounts to a small soft magnetic grinding head; the workpiece and the magnetorheological fluid generates relative motion, the motion in multiple degrees of freedom of the workpiece is controlled, and therefore the outer surface/outer surfaces of one or more workpieces can be polished at the same time through one-time clamping; and the outer surfaces of the workpieces can be planes, arc faces or complex surfaces.

An agitator for agitating a melt includes a heat-resistive container having a blast opening through which cooling air is blown and an exhaust opening for exhausting air having been subjected to heat exchange, and a rotating magnet assembly composed of a permanent magnet housed in the heat-resistive container in a rotatable manner, magnetic lines of force emitted from the permanent magnet penetrating through the heat-resistive container to exit outside, and then penetrating the heat-resistive container again to return to the permanent magnet.

The closed electron drift plasma accelerator comprises an annular ionization chamber, an acceleration chamber on the same axis as the ionization chamber, an annular anode, a hollow cathode, a first DC voltage source, an annular gas manifold, a magnetic circuit, and magnetic field generators. A coaxial annular coil is placed in the cavity of the ionization chamber, is provided with bias conductive cladding connected, together with the electrically-conductive material of the inside faces of the walls of the ionization chamber, to the positive pole of a second voltage source whose negative pole is connected to the anode, and constitutes an additional magnetic field generator which, together with the other magnetic field generators, forms a magnetic field having a magnetic line of force with an “X” point corresponding to a magnetic field zero situated between the coaxial annular coil and the anode.

A first conductor and a second conductor are provided at a diaphragm. The first and second conductors intersect magnetic force lines between north poles and south poles of permanent magnets M which are adjacent to one another. When electricity passes through the conductors, a direction in which a force from the magnetic field acts on the current is substantially orthogonal to a surface of the diaphragm. Therefore, the diaphragm can be oscillated in the direction orthogonal to the diaphragm surface. The conductors have widths of from 1000 mum to 2000 mum. Therefore, relative errors in the widths caused by etching can be greatly reduced compared to the prior art, and etching is easier. Moreover, the conductors are arranged in a zigzag pattern. Because the conductors do not have a coil form, a large number of through-holes is not required as in conventional products.

The invention relates to a disc type iron-core-free PMDC motor. The disc type iron-core-free PMDC motor comprises a middle stator and rotors which are installed on a spindle and in disc shapes, disc surfaces are arranged parallelly and correspondingly, gap flux densities on two sides of the stator are the same, the stator comprises an iron-core-free rolled annular winding which is placed axially, and a magnetic line of force passes gaps and the winding axially; and each rotor is a disc composed of a magnetic conducting disc for accommodating magnetic steel and an aluminum case, a permanent magnet is bonded on the magnetic conducting disc in an N and S alternating mode, and polarities of magnetic steel corresponding to the rotors up and down are opposite. The disc type iron-core-free PMDC motor is characterized in that the annular winding is an axial symmetry conical ring composed of a plurality of sections of arcs, the central axis points to the axis of the stator, and the tip of the conical ring is close to the axis of the stator. The magneto-electricity conversion efficiency of the motor is improved by above 10%.

The invention discloses a dual-Hall element current sensor and belongs to a current sensing device. The dual-Hall element current sensor is capable of solving the problems that the magnetic leakage is high and the measurement accuracy is lower due to the fact that air gaps in an iron core of a traditional dual-Hall element current sensor are bigger, and meanwhile, reducing outside noise interference, magnetic field interference, electrostatic interference and the like, and is used for measuring alternating current or direct current. The dual-Hall element current sensor disclosed by the invention comprises an insulating shell, an open annular iron core and two Hall elements, wherein the open annular iron core is located in the annular cavity of the insulating shell; the two Hall elements are located in the same air gap of the open annular iron core and the same section which is vertical to a magnetic line of force; the insulating shell is provided with a wiring terminal; the two Hall elements are respectively and electrically connected with the wiring terminal; and a magnetic shielding ring is arranged between the insulating shell and the open annular iron core. According to the dual-Hall element current sensor disclosed by the invention, by the placement mode of the two Hall elements, the magnetic leakage of the open iron core is reduced, and the measurement accuracy is correspondingly improved. The interference of a peripheral electromagnetic field can be effectively shielded by the arranged magnetic shielding ring.