172results about How to "Reduce magnetic interference" patented technology

Provided is a magnetic encoder which includes plural rows of magnetic encoder tracks. One magnetic encoder track of the magnetic encoder tracks includes magnetic pattern magnetized thereto to generate signals of equal pitch for detection of rotation. The magnetized magnetic pattern includes N poles and S poles arranged in alternate fashion. The magnetic encoder is configured to be employed spaced through an air gap from sensors that read magnetic signals of the respective magnetic encoder tracks. The magnetic encoder track is configured such that the magnetic pattern thereof acting on position of the corresponding sensor is, under the interference of magnetism of the plural rows of magnetic encoder tracks, detected by the corresponding sensor as an equal pitch magnetic pattern.

The present invention provides an un-manned airborne vehicle (UAV), for acquiring aeromagnetic data for geophysical surveying at low altitude on land or over water, comprising an extended fuselage that is adapted to hold and maintain magnetometer and a magnetic compensation magnetometer at a minimum distance from the avionics and propulsion systems of the UAV. The magnetometer measures magnetic anomalies and the magnetic compensation magnetometer measures magnetic responses corresponding to the pitch, yaw and roll of the UAV. A data acquisition system stores and removes the magnetic response measurements from the magnetic anomaly measurements. The data acquisition system also stores a survey flight plan and transmits the same to the avionics system. The generator of the UAV is shielded and the propulsion system is stabilized to reduce magnetic and vibrational noises that can interfere with the operation of the magnetometer.

The invention relates to a double-camera module. The double-camera module comprises a circuit board, two image sensors, a base, a housing, a drive mechanism and two lens units. A first accommodating space, a second accommodating space cavity and a third accommodating space are formed in the housing; and the drive mechanism comprises a first carrier, a second carrier, a third carrier, an upper spring leaf, a lower spring leaf, a magnet and a coil. When the coil is electrified by the circuit board, the second carrier which is wound with the coil can move up and down along a direction of optical axis due to the fact that the coil is applied with Ampere force in magnetic fields generated in the magnet; the second carrier is connected with the first carrier and the third carrier by a connecting rod, and therefore, the second carrier can simultaneously drive the first carrier and the third carrier to move up and down, i.e., drive the lens units on the first carrier and the third carrier to move up and down. One drive mechanism is adopted to simultaneously drive the two lens units, and therefore, magnetic interference can be effectively reduced, and the image quality is improved.

The disclosure relates to a magnetic device for detecting the absolute position of an input shaft capable of rotating more than 360°, the device including a main magnetic sensor, a motion reducer, and a secondary magnetic sensor, wherein the main magnetic sensor is connected to a rotor, measures the rotation of the shaft for ranges of angles of less than 360°, and includes a main magnet, the motion reducer converts the rotation of the shaft into a reduced rotation, the maximum amplitude of which is equal to no more than 360°, and the secondary magnetic sensor measures the reduced rotation and includes a secondary magnet. According to the disclosure, the secondary magnet is arranged between the upper and lower planes of the main rotor, and the main magnet has P pairs of poles, where P is greater than 1.

A system for communicating information from a detection device is provided through a waterproof and wireless interface. The system generally includes a communication member having an inductor and coupled to the detection device. An interface including another inductor is in communicating relation with the communication member. Upon a signal from the detection device, a magnetic field is produced by the inductor of the communication member and is transmitted to the inductor of the interface.

The magnetic interference fields, which originate from a receiver in a hearing apparatus and in particular a hearing device, are to be reduced further. To this end, provision is made for a shielding facility to be incorporated into the housing of a receiver in order to magnetically shield between the outer wall with a connecting facility and an electroacoustic converter. The shielding facility can comprise a soft magnetic shielding sheet of high magnetic permeability and / or for instance also a compensation coil.

An optical system includes a base, a first lens driving module, and a second lens driving module. The first lens driving module includes a first lens holder, a first magnet, and a first coil. The first lens holder is configured to hold a first optical element. The first coil corresponding to the first magnet is configured to drive the first lens holder to move relative to the base. The second lens driving module includes a second lens holder, a second magnet, and a second coil. The second lens holder is configured to hold a second optical element. The second coil corresponding to the second magnet is configured to drive the second lens holder to move relative to the base. The first magnet is disposed between the first and second lens holders, and no other magnet is disposed between the first and second lens holders except the first magnet.

The present invention relates to an apparatus for converting an audio signal from a source (25) into audio waves, comprising a modulator (17), for modulating said audio signal, an amplifying switching stage (15), for amplifying a modulated audio signal supplied from the modulator, and a transducer (19). The transducer is connected directly to the switching stage, and is arranged to convert a pulse train from the switching stage into audio waves. Further, the modulator, the switching stage and the conversion means are integrated mechanically and electrically in one operational unit, being connectable directly to a mains power supply (12). By this electrical integration, no separate filtering is required, but instead the inherent qualities of the transducer are used for accomplishing filtering of the pulse train.

A system for communicating information from a detection device is provided through a waterproof and wireless interface. The system generally includes a communication member having an inductor and coupled to the detection device. An interface including another inductor is in communicating relation with the communication member. Upon a signal from the detection device, a magnetic field is produced by the inductor of the communication member and is transmitted to the inductor of the interface.

A camera module having a housing accommodating a lens module; a lens driver, comprising a magnet mounted in the housing, configured to induce a driving force along an optical axis direction and in a direction perpendicular to the optical axis direction; and a yoke portion offset from the magnet along the optical axis direction.

The invention relates to a lens driving device having an anti-shake function. An anti-shake actuator comprises first anti-shake coils which are fixed on the rear side of a magnet support, second anti-shake coils which are fixed on one side of a pedestal, first magnet components which are fixed on the magnet support and opposite to the second anti-shake coils in a spaced way, and second magnet components which are fixed on one side of the pedestal and opposite to the first anti-shake coils in a spaced way. The OIS movable part of the lens driving device having the anti-shake function only comprises one set of magnet and one set of anti-shake coil, and the other set of the magnet and the anti-shake coil are arranged in the OIS fixed part so that the weight of the movable part is greatly reduced in comparison with that of the present four sets or two pairs of magnets, the requirement for the suspension spring can be reduced and the overall size can be more compact. The movable part is only provided with one set or one pair of magnets so that magnetic interference of at least one direction can be reduced through orientation arrangement, and driving of the lens is enabled to be more accurate.

An electronic card connector includes a metal shell, a tray, a first terminal block, a second terminal block and a third terminal block. The metal shell is provided on a circuit board and cooperates with the circuit board to define a slot. The tray comprises an insulative body and a shielding unit. A first receiving groove of the insulative body receives a SD card and second and third receiving grooves of the insulative body respectively receive first and second SIM cards. The shielding unit is made of metal, provided in the insulative body and positioned between the first receiving groove and the second receiving groove and the third receiving groove, so as to shield the electromagnetic interference from the SD card.

The optical apparatus includes an image stabilizing lens shiftable with respect to an optical axis, a movable lens movable in an optical axis direction, first and second actuators shifting the image stabilizing lens, and a third actuator moving the movable lens. The first, second and third actuators include a magnet and a coil. When viewed in the optical axis direction, the first and second actuators are disposed in a first area and the third actuator is disposed in a second area, the first and second areas being opposite to each other with respect to the optical axis. The first and second actuators are respectively disposed in areas in the first area opposite to each other with respect to a straight line passing the optical axis and the third actuator. This arrangement enables reduction of magnetic interference between the first and second actuators and the third actuator.

Provided is a spread spectrum clock generating circuit. The spread spectrum clock generating circuit includes: a phase detector receiving a reference frequency signal from the external and detecting a phase difference between the reference frequency signal and a frequency-divided signal; a voltage controlled oscillator outputting an oscillation signal corresponding to a detection result of the phase detector; a main divider generating the frequency-divided signal by dividing a frequency of the oscillation signal by a main dividing ratio; and a dividing ratio controller generating a variable count value, generating a sub dividing ratio by performing delta-sigma modulation according to the count value, and adjusting the main dividing ratio according to the sub dividing ratio.

An electrical connector (1) mounted on a mother printed circuit board (2) includes an insulative housing (3), a contacting module (4) having a pair of daughter printed circuit boards (42), a grounding member (6) and an outer shield (5) enclosing the insulative housing. The grounding member has a base portion (61) connecting to the daughter printed circuit board and a contacting portion (62) extending downwardly for connecting with the mother printed circuit board. The outer shield has a protruding member (522) for contacting with the grounding member and a number of tines (53) extending downwardly therefrom in contact with the mother printed circuit board for grounding.

An electrical connector assembly (100) includes an insulative housing (1), a terminal block assembly (2) assembled to the insulative housing (1) and a cable (3) electrically connecting with the terminal block assembly (2). The insulative housing (1) defines a mating direction and a receiving chamber (15). The terminal block assembly (2) includes a number of first and second terminals (26, 28) and an inserting housing (20) insert-molded with the terminals (26, 28). The first and second terminals (26, 28) are divided into two rows and each having a tail portion (261, 281), an interconnecting portion (262, 282) and a contacting portion (263, 283). The contacting portions (263, 283) of the first terminals (26) and the second terminals (28) extend out of the inserting housing (20) along the mating direction and are located in the same plane.

A moving-coil closed-loop auto-focusing module with low magnetic interference includes an upper cover, a base frame, a lens module, an elastic module, at least one coil, at least one pair of two opposing driving magnets, an external circuit and at least one sensor magnet. The coil surrounds the lens module. The two driving magnets are located individually at respective lateral sides of the base frame in correspondence with the coil. The external circuit located under the base frame includes an image-sensing element and at least one sensor. The sensor magnet is mounted peripherally to the lens module, and has magnetic lines parallel to the optical image-capturing axis, such that a magnetizing surface of the sensor magnet can face downward to align the sensor on the external circuit. Thereupon, the lens module can be controlled to displace along an optical image-capturing axis in a closed-loop manner.

The invention discloses a method for preventing an intelligent electric meter from external electromagnetic field interference based on finite element simulation analysis. The method includes the following steps that firstly, parameters of an electric meter simulation model are determined; secondly, electric meter simulation model output embodied when no external electromagnetic interference exists is calculated; thirdly, electric meter simulation model output embodied when power frequency magnetic field interference exists is calculated; fourthly, the influences of the change of the distance between an electromagnet and an electric energy meter on the electric meter simulation model output are analyzed; fifthly, the influences of a direct current magnetic field on a transformer power supply are analyzed; sixthly, the shielding effects of different permeability magnetic materials on an interference electromagnetic field are analyzed; seventhly, according to the function relationships acquired in the third step, the fourth step and the fifth step respectively and in combination with the shielding effects of the different permeability magnetic materials on the interference electromagnetic field acquired in the sixth step, the safe distances between a power supply inside the intelligent electric meter and a case of the intelligent electric meter, between a voltage transformer inside the intelligent electric meter and the case of the intelligent electric meter and between a current transformer inside the intelligent electric meter and the case of the intelligent electric meter are acquired. Three-dimensional electromagnetic field analysis is conducted based on finite element analysis, the influences of the external electromagnetic field on the electric energy meter are prevented, and the electric energy meter is protected against electricity stealing.

The invention discloses a micro-fluidic magnetic bead detection method and a micro-fluidic magnetic bead detection device based on giant magneto-resistance. The method comprises the steps of feeding an immune-magnetic bead solution in an immune-magnetic bead solution inlet, feeding a cell solution by a cell solution inlet, mixing the two solutions in a mixing chamber to form a mixed solution and then entering an inverted tri-prism micro-tube, magnetizing immune-magnetic beads by a magnetic field generated by a permanent magnet, and slowly flowing the immune-magnetic beads along the tube wall of the tri-prism micro-tube; the resistance value of a giant magneto-resistance chip is changed due to the influence on a horizontal magnetic field obtained by immune-magnetic bead magnetization, a level signal of a connecting point of a Wheatstone bridge is output a signal processing module by the giant magneto-resistance chip, and a signal processing module is used for judging the distance between the immune-magnetic bead distance and the center of a giant magneto-resistance resistor stripe according to the resistance value of the giant magneto-resistance calculated according to an input level. The method provided by the invention is applicable to detecting the positions of microcosmic substances, and being capable of precisely detecting the position change of the immune-magnetic beads.

The invention relates to a track generation method capable of reducing magnetic interference of a fixed-wing unmanned aerial vehicle platform, is applicable to magnetic interference control on fixed-wing unmanned aerial vehicle avionics devices and belongs to the technical field of magnetic sensing. The method provided by the invention further reduces interference of a fixed-wing unmanned aerial vehicle magnetic field on onboard high-precision equipment by generating specific track points which do not interfere with task execution under the premise that the magnetic interference of the platform can not be completely eliminated after magnetic compensation is performed on a fixed-wing unmanned aerial vehicle in advance; and the method has the advantages of low cost, easy operation, high track point precision and easy realization. Besides, the method provided by the invention can also be operated even under the condition of being lack of a professional knowledge background, so that the method can be widely applied to task path planning in fixed-wing unmanned aerial vehicle engineering application.

An optical system is provided, including a base, a first lens driving module and a second lens driving module. The first lens driving module includes a first holder, a first magnet, and a first coil corresponding to the first magnet, wherein the first holder is used to hold a first optical element and has a first side. The second lens driving module includes a second holder, a second magnet, and a second coil corresponding to the second magnet, wherein the second holder is used to hold a second optical element and has a second side. The first side is adjacent and parallel to the second side, and no magnet is disposed on the first side or second side.

The magnetic levitation system comprises: a frame tank with an electromagnet to balance dropping gravity of floating body, a floating body under said tank contained permanent magnet on its c.g.line and a rotation magnet, a displacement sensor to measure floating body position, a magnetic levitation control circuit, and a rotation generation device matched with said rotation magnet; arranging said sensor, control circuit and generation device all in said frame tank. The advantages of this invention include: 1. enlarging selection range for floating body; 2. saving base and frame to simplify structure and benefit to large-scale; and 3. increasing application area.

The embodiment of the invention provides a double-camera device. The double-camera device comprises a first camera, wherein the first camera comprises a first motor, and the first motor comprises at least one first Hall sensor; and a second camera, wherein the second camera comprises a second motor, the second motor and the first motor are arranged side by side, the second motor comprises N secondcoils and N second magnets, the second coils are used for suspending and supporting the second magnets in the case of power-on, N is a positive integer, N is a multiple of 4, and the distance betweena first setting position of the first Hall sensor in the first motor and a second setting position of the second magnet in the second motor is greater than a first preset distance. The technical scheme of the invention can reduce the magnetic interference of the motor with an anti-shake function to the Hall sensor in the other motor and improve the user experience.

A spread spectrum clock signal generator for spreading an input clock signal into an output clock signal includes a clock signal delay chain for delaying the input clock signal into a delay clock signal group having a plurality of delay clock signals, a modulation controller for outputting a counter clock signal control signal, a clock signal selection circuit for selecting, from the delay clock signal group, a modulation clock signal group having a plurality of modulation clock signals, a programmable counter for generating a counting value according to a counter clock signal, and a clock signal output unit for combining the modulation clock signals into the output clock signal according to the counting value, and further generating the counter clock signal, outputted to the programmable counter, according to the counter clock signal control signal.

The invention discloses a double-permanent magnet inner-rotor permanent magnet biased spherical radial magnetic bearing which comprises two parts, namely a stator system and a rotor system, wherein the stator system mainly comprises a stator upper spherical iron core, a stator lower spherical iron core, an exciting coil, a stator magnetic-insulating ring, a stator upper magnetic-conductive ring, a stator lower magnetic-conductive ring, a stator permanent magnet, a stator sleeve and a stator locking ring; the rotor system mainly comprises a rotor upper spherical iron core, a rotor lower spherical iron core, a rotor magnetic-insulating ring, a rotor upper magnetic-conductive ring, a rotor lower magnetic-conductive ring, a rotor permanent magnet, a rotor sleeve and a rotor locking ring; the stator upper spherical iron core forms four magnetic poles, the stator lower spherical iron core forms four magnetic poles, the stator upper spherical iron core and the stator lower spherical iron core form eight magnetic poles of the upper end and lower end of the magnetic bearing, the magnetic poles respectively form spherical magnetic poles in positive and negative directions of an X axis and a Y axis, and the exciting coil is wound on each stator magnetic pole. The double-permanent magnet inner-rotor permanent magnet biased spherical radial magnetic bearing disclosed by the invention prevents the disturbance of radial translation control on radial twisting control, can be used for reducing the magnetic interference of self residual magnetism on the outside, can be taken as the non-contact support of rotary parts, namely a magnetic suspension universal momentum wheel and the like, for space, and can be used for enhancing the accuracy of the control moment of the momentum wheel.

A cryogenic magnet system, comprising a cryogenic vessel (1) housing a magnet winding, a vacuum jacket (3) enclosing the cryogenic vessel and a refrigerator (4) at least partially housed within the vacuum jacket and thermally linked (6) to the cryogenic vessel. In particular, the system further comprises an electromagnetic shield.

A multiple-lens camera system is provided, including a first lens driving module, a second lens driving module, and a shielding member. The first and second lens driving modules respectively include a frame, a lens holder movably disposed in the frame for holding a lens, a magnetic element disposed on a side of the lens holder and a driving board, wherein the driving board has a first coil corresponding to the magnetic element, to generate a magnetic force for moving the lens holder and the lens relative to the driving board. The shielding member is disposed in the first lens driving module and between the two magnetic elements of the first and second lens driving modules which are adjacent to each other, to suppress magnetic interference between the first and second lens driving modules.

The optical apparatus includes an image stabilizing lens shiftable with respect to an optical axis, a movable lens movable in an optical axis direction, first and second actuators shifting the image stabilizing lens, and a third actuator moving the movable lens. The first, second and third actuators include a magnet and a coil. When viewed in the optical axis direction, the first and second actuators are disposed in a first area and the third actuator is disposed in a second area, the first and second areas being opposite to each other with respect to the optical axis. The first and second actuators are respectively disposed in areas in the first area opposite to each other with respect to a straight line passing the optical axis and the third actuator. This arrangement enables reduction of magnetic interference between the first and second actuators and the third actuator.