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6561 results about "Electromagnetic induction" patented technology

Electromagnetic or magnetic induction is the production of an electromotive force (i.e., voltage) across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction. Lenz's law describes the direction of the induced field. Faraday's law was later generalized to become the Maxwell–Faraday equation, one of the four Maxwell equations in his theory of electromagnetism.

Non-contact power transmission device

An electromagnetic resonance non-contact power transmission device includes a transmitter including a transmitter resonance element having a mechanism for discretely or continuously varying a resonant frequency, a transmitter excitation element coupled to the transmitter resonance element by electromagnetic induction, and an alternating current source for applying an alternating current at the same frequency as the resonant frequency to the transmitter excitation element, and a plurality of receivers each including a receiver resonance element having a specific resonant frequency, a receiver excitation element coupled to the receiver resonance element by electromagnetic induction, and an output circuit for outputting an electric current induced by the receiver excitation element. Electric power is transmitted selectively from the transmitter to any of the receivers having different specific resonant frequencies by changing the resonant frequency of the transmitter.
Owner:SONY CORP

Ultrasonic spindle system

It is possible to stably supply an electric signal to an ultrasonic generation element without causing friction or damage on parts or without requiring periodical parts exchange. A reception coil (11) connected to a vibrator (6) is wound on the outer circumference of a housing (1) constituting a shaft (30) of a machining spindle (101). The reception coil (11) is surrounded coaxially by a transmission coil (12) at an appropriate interval. A predetermined electric signal outputted from an ultrasonic drive device (21) for driving the vibrator (6) is applied to the transmission coil (12). The predetermined electric signal may be applied to the vibrator (6) via the reception coil (11) by electromagnetic induction between the transmission coil (12) and the reception coil (11).
Owner:KUBOTA OSAMU +2

Induced power transmission circuit

To provide an induced power transmission circuit that transmits, from a transmission antenna (1) connected to a power supply circuit, an AC power having an angular frequency ω to a spaced reception antenna (2) with an excellent efficiency, thereby transmitting it to a load circuit. The induced power transmission circuit comprises a circuit the two ends of which are coupled by a capacitor (C1) and in which the power supply circuit is connected in series to a midway port (1) (P1) of the transmission antenna (1) having an effective self-inductance L1; and a circuit the two ends of which are coupled by a capacitor (C2) and in which the load circuit is connected in series to a midway port (2) (P2) of the reception antenna (2) having an effective self-inductance L2; wherein for a coupling coefficient k of the electromagnetic induction between the antennas and for a phase angle β having an arbitrary value, the angular frequency ω is set to the square root of the reciprocal of a value of L2×C2×(1+k*cos (β)), the output impedance of the power supply circuit is set to approximately kωL1*sin (β), and the input impedance of the load circuit is set to approximately kωL2*sin (β). There is also provided an impedance converting circuit that converts the circuit impedances.
Owner:KIKUCHI HIDEO

Noncontact Electric Power Transmission System

Disclosed is a noncontact electric power transmission system having a power transmitter circuit section 10 and a power receiver circuit section 30 which are adapted to be coupled to transmit electric power from a transmitter coil Lp provided in the power transmitter circuit section 10 to a receiver coil Ls provided in the power receiver circuit section 30, in a noncontact manner by means of electromagnetic induction. The noncontact electric power transmission system comprises: a separately-excited or self-excited switching circuit 2 provided in the power transmitter circuit section 10; a control IC 3 operable to drive the switching circuit 2; an LC series resonant circuit including a capacitor Cp connected in series to the transmitter coil Lp or an LC parallel resonant circuit including a capacitor Cp connected in parallel to the transmitter coil Lp; and an LC parallel resonant circuit including a capacitor Cs connected in parallel to the receiver coil Ls, wherein an oscillating frequency (Fosc) of the control IC 3, a resonant frequency (Fpr) of the LC series resonant circuit or the LC parallel resonant circuit in the power transmitter circuit section 10, and a resonant frequency (Fsr) of the LC parallel resonant circuit in the power receiver circuit section 30, have the following relationship: Fpr<Fosc<Fsr.
Owner:MURATA MFG CO LTD

System for electrical power supply and for transmitting data without electrical contact

The invention relates to an assembly comprising a power transmitter (E) and a power receiver (R) respectively comprising a primary coil (11) and a secondary coil (22), in which the transmitter and the receiver are of the electromagnetic induction type and allow on the one hand the powering without electrical contact of the receiver by the transmitter, and on the other hand a bidirectional communication without electrical contact between the transmitter and the receiver.
Owner:DELACHAUX

Touch control display screen with a built-in electromagnet induction layer of septum array grids

A touch control display screen with built-in membrane antenna array lattice electromagnetic induction layer, including at least a display screen and a shell; wherein an induction layer is provided in the rear of the display screen, the output of the induction layer is connected to an induction control circuit, a display screen control circuit is also provided in the shell; the induction layer is the antenna array printed on the insulation membrane and arranged along the X, Y axes, therein the area enclosed by each lattice unit constitutes one induction cell. Because the electromagnetic induction layer is provided in the rear of the display screen and flexible membrane-type, printed electromagnetic induction array antenna is used as the identifying induction component according to the present invention, the manufacture is easy, the cost is low, and the advantage in cost-cut is prominent in comparison with the prior art when the area of the display screen is larger. The accuracy of identification is high, and the mouse information or handwriting information can be input exactly by means of brush strokes of finger strokes; as a touch screen, the display screen is covered by a protecting film to avoid the physical damage, so it has long operating life.
Owner:MORGAN TOUCH TECH (HK) CO LTD +1

Digitizer function-equipped liquid crystal display device information processing electronic device, and game device

Provided is a digitizer function-equipped liquid crystal display device capable of preventing the wire shadows of a loop antenna from being projected on a liquid crystal panel and capable of being applied to a large size liquid crystal panel. It is also possible to provide an information processing electronic device and a game device provided with the digitizer function-equipped liquid crystal display device. Here, the digitizer function-equipped liquid crystal display device includes: a liquid crystal panel 1; a light diffusion member 2 which is disposed between the liquid crystal panel 1 and a backlight 5 irradiating the liquid crystal panel 1 with light; an electromagnetic induction type loop antenna which is disposed at a portion apart from the light diffusion member 2 in the direction toward the backlight 5 by a predetermined spacing so as to detect a position on the plane of the liquid crystal panel 1 in one coordinate axis direction and another coordinate axis direction that intersects the one coordinate axis direction; and a spacing retaining means for retaining the spacing between the light diffusion member 2 and loop antenna at a predetermined spacing value. As the spacing retaining means, a first light transmitting member 3 formed of a plate material having a light transmitting property is used.
Owner:SEGA CORP

Voltage regulating devices in LED lamps with multiple power sources

LED driver circuits containing voltage reducing devices, voltage regulating devices, and voltage converting devices are disclosed as the main components to provide power to LEDs. The LED driver circuits are designed to work with a ballast, mains alternating current voltage, direct current voltage, and electromagnetic induction power. The voltage regulating devices can be a resistor in series with at least one zener diode or a voltage regulator both in parallel with and providing power to the LEDs. The LEDs can also be anti-parallel diode pairs consisting of one diode and one LED or two LEDs, or the LEDs can be anti-parallel diode string pairs consisting of diodes and LEDs or all LEDs. The LED driver circuits will be incorporated into LED replacement lamps, and in particular to LED lamps to replace fluorescent lamps for use with existing ballasts and other power sources where the ballast may be removed or bypassed.
Owner:DENOVO LIGHTING

Mobile communication device with charging module

A mobile communication device includes a battery controller and an inductive charger. The battery control is adapted for electrically connecting to a rechargeable battery of the portable electronic device. The inductive charger includes a power connector adapted for electrically connecting with a power source, and a transmitting inductor electrically coupling with the power connector for generating an electromagnetic induction, wherein the receiving inductor is electrically inducted to the transmitting inductor in a contact free manner for wirelessly transmitting an inductive charging power to the rechargeable battery of the portable electronic device through the transmitting inductor. Therefore, when the rechargeable battery of the portable electronic device is located within an induction distance of the inductive charger, the rechargeable battery of the portable electronic device is automatically charged.
Owner:WANG KEVIN PEICHIH

Tobacco suction system based on electromagnetic heating

The invention discloses a tobacco suction system based on electromagnetic heating. The tobacco suction system is characterized by comprising an end cover (1), a heater (2) and an electromagnetic induction system, wherein the end cover (1) is detachably connected to the heater (2); the end cover (1) comprises a circular cover (11) and a filter tip (13); the heater (2) comprises a shell (21), an inner container (23), a base plate (24) and a cylindrical iron core (25); the electromagnetic induction system comprises an induction coil for heating the inner container (23), the base plate (24) and the cylindrical iron core (25), and a temperature control circuit. By heating the inner container, the base plate and the cylindrical iron core through the electromagnetic induction system, the heating speed can be increased, the heat efficiency is high, and instant heating can be realized, thereby better meeting the requirement of good suction mouthfeel; due to the arrangement of the cylindrical iron core, tobacco products can be heated uniformly and fully, and waste caused by insufficient heating of the tobacco products can be avoided. The tobacco suction system is suitable to be popularized and applied.
Owner:CHINA TOBACCO SICHUAN IND CO LTD +1
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