Abstract: To reduce a limitation in a heat method caused by an interference of an electromagnetic wave in an electromagnetic wave beating system that uses an electromagnetic wave generator by a semiconductor element.

Abstract: To heat an object locally by automatically recognizing a shape of the object and emitting an electromagnetic wave based on the shape without enlarging a device size. An electromagnetic wave heating system comprises a heat chamber having a wall surface, in which an object is placed to be heated, a flat antenna arranged on the wall surface of the heat chamber and configured to emit the electromagnetic wave so as to heat the object inside the heat chamber, and a controller configured to control a movement of the flat antenna. The flat antenna comprises a plurality of antennas arranged in an array manner, and the controller detects a shape or a temperature distribution of the object based on a reflected power that is generated when the electromagnetic wave is emitted from the plurality of antennas, and determines a size of microwave supplied into each of the plurality of antennas based on a detection result thereof.

Abstract: The ignition system has an electromagnetic wave oscillator which oscillates electromagnetic waves, a control device that controls the electromagnetic wave oscillator, a plasma generator which integrates a booster circuit containing a resonant circuit capacitive coupled with the electromagnetic wave oscillator, and a discharge electrode which discharges a high voltage generated by the booster circuit. The plasma generator includes a plurality of discharge electrodes arranged so as to be exposed within the combustion chamber of the internal combustion engine.

Abstract: An igniter that has a large ignition power and an electromagnetic wave resonance structure with a small reflected power is provided.

Abstract: An ignition system improves an air-fuel-ratio, i.e., good mileage and lean burn without changing a gasoline engine structure significantly. The ignition system comprises an electromagnetic wave generator including a first output part and a second output part configured to output an electromagnetic wave, a discharge device comprising a booster and a discharger provided at an output side of the booster, the booster having a resonance structure configured to boost an electromagnetic wave inputted from the first output part so as to cause a discharge from the discharger, and an electromagnetic wave emitter configured to emit an electromagnetic wave inputted from the second output part. The electromagnetic wave generator decreases an output power from the first output part, while the electromagnetic wave generator increases the output power from the second output part when an amount of a reflected wave from the discharge device exceeds a predetermined value.

Abstract: An ignition unit improves an air-fuel-ratio, i.e., good mileage and lean burn without changing a gasoline engine structure significantly. The ignition unit comprises a discharge device including a booster and a discharger provided at an output side of the booster, the booster having a resonance structure configured to boost the electromagnetic wave inputted from the electromagnetic wave oscillator so as to cause a discharge from the discharger, and an electromagnetic wave emitter electrically connected to the electromagnetic wave oscillator and configured to emit the electromagnetic wave inputted from the electromagnetic wave oscillator.

Abstract: A small-size injector having a built-in ignition device which can surely inject fuel and ignite the fuel with low electric power by the ignition device with a simple configuration is provided. The injector comprises a fuel injecting device 2 having a fuel injecting port 20 that injects the fuel, an ignition device 3 configured to ignite the injected fuel, and a casing 10 inside housing therein the fuel injecting device 2 and the ignition device 3 together. The motion device 3 is constituted of a plasma generator 3 which integrally comprises a booster 5 having a resonation structure capacity-coupled with an electromagnetic wave oscillator MW configured to oscillate an electromagnetic wave, and a discharger 6 configured to cause a discharge of a high voltage generated by the booster 5.

Abstract: An injector unit that can use a gaseous fuel such as CNG in an already-existing diesel engine and a spark plug that uses the injector unit, are provided. The injector unit includes an injector, an igniter having a resonance structure configured to boost an inputted microwave and a discharger configured to perform a discharge, and a casing configured to house therein the injector and the igniter. The igniter includes a first part configured to transmit the inputted microwave, a second part configured to perform a capacity coupling to attain an impedance matching between the microwave and the igniter, and a third part configured to transmit the capacity-coupled microwave to the discharger. Moreover, the igniter is bent at a boundary of the first part and the second part, a boundary of the second part and the third part, or inside the first part.

Abstract: To provide a spark plug that can reduce power loss and prevent erosion of a tip end part of a central electrode, even in a configuration such that a discharge current and an electromagnetic wave are emitted from a terminal fitting part of the spark plug, and a plasma generation device using the spark plug. The spark plug is provided with a central electrode 2 including a terminal fitting part 2A and an electrode main body 2B electrically connected to the terminal fitting part 2A, an insulator 3 formed with an axial hole 30, which the central electrode 2 is fitted into, a main fitting 4 that surrounds the insulator 3, and a ground electrode 5 that extends from an end surface of the main fitting 4 and is adapted to form a discharge gap that causes a spark discharge between the central electrode 2 and the electrode main body 2B.

Abstract: An engine control device 13 that cannot output a control signal to an electromagnetic wave emission device 30 is used to emit electromagnetic wave at an appropriate timing from the device 30 to a combustion chamber 10. A signal processing device 40 is connected to the engine control device 13 that outputs an ignition signal for instructing an ignition device 12 of the engine 20 to ignite fuel air mixture in the combustion chamber 10 of the engine 20. The signal processing device 40, upon receiving the ignition signal, outputs to the electromagnetic wave emission device 30 an electromagnetic wave drive signal that determines based on the ignition signal an emission period, which is a period for the electromagnetic wave emission device 30 to emit an electromagnetic wave to the combustion chamber 10, so that an ignition operation is performed during the emission period of the electromagnetic wave.

Abstract: The ignition system has an electromagnetic wave oscillator which oscillates electromagnetic waves, a control device that controls the electromagnetic wave oscillator, a plasma generator which integrates a booster circuit containing a resonant circuit capacitive coupled with the electromagnetic wave oscillator, and a discharge electrode which discharges a high voltage generated by the booster circuit. The plasma generator includes a plurality of discharge electrodes arranged so as to be exposed within the combustion chamber of the internal combustion engine.

Abstract: To provide a spark plug that can reduce power loss and prevent erosion of a tip end part of a central electrode, even in a configuration such that a discharge current and an electromagnetic wave are emitted from a terminal fitting part of the spark plug, and a plasma generation device using the spark plug. The spark plug is provided with a central electrode 2 including a terminal fitting part 2A and an electrode main body 2B electrically connected to the terminal fitting part 2A, an insulator 3 formed with an axial hole 30, which the central electrode 2 is fitted into, a main fitting 4 that surrounds the insulator 3, and a ground electrode 5 that extends from an end surface of the main fitting 4 and is adapted to form a discharge gap that causes a spark discharge between the central electrode 2 and the electrode main body 2B.

Abstract: To suppress the reflection of an electromagnetic wave from a load in a plasma generation device 30 that generates electromagnetic wave plasma by emitting the electromagnetic wave to a combustion chamber 10 of an engine 20. The plasma generation device 30 includes an electromagnetic wave oscillator 33 that oscillates the electromagnetic wave, an antenna 15a for emitting the electromagnetic wave oscillated by the electromagnetic wave oscillator to the combustion chamber 10 of the engine 20, and a stub adjustment unit 52, 53. The stub 51 is provided on a transmission line 60 for electromagnetic wave from the electromagnetic wave oscillator 33 to the antenna 15a. While the engine 20 is operating, the stub adjustment unit 52, 53 adjusts a short circuit location on the stub 51 based on the intensity of a reflected wave of the electromagnetic wave reflected from the antenna 15a.

Abstract: A high frequency switch device includes a branch transmission line corresponding to each output terminal provided with a switching part. In the branch transmission line, the switching part includes a transmission side diode provided in such a manner that a cathode thereof is arranged on a side of an input terminal 41 and an anode thereof is arranged on a side of the output terminal, and a ground side diode provided in such a manner that a cathode thereof is grounded and an anode thereof is electrically connected between the output terminal and the transmission side diode in the branch transmission line. The branch transmission line includes a first capacitor and a second capacitor on the side of the output terminal from the transmission side diode in such a manner that the anode of the ground side diode is connected between the first capacitor and the second capacitor.

Abstract: The plasma generation device 30 is provided with a high frequency generation device 37 that generates a high frequency wave, and a high frequency radiator 15 that radiates the high frequency wave outputted from the high frequency generation device 37 to a target space 10, and generates plasma by supplying energy of the high frequency wave to the target space 10. In the plasma generation device 30, the high frequency generation device 37 is provided with an oscillator 41 that oscillates a high frequency wave, and an amplifier 42 that amplifies and outputs the high frequency wave oscillated by the oscillator 41 to the high frequency radiator 15. In the high frequency generating device 37 the amplifier 42 alone is integrated with the high frequency radiator 15, from among the oscillator 41 and the amplifier 42.

Abstract: A mixer for mixing pulse voltage energy and electromagnetic wave energy in the same transmission line is provided with a first input terminal to which an electromagnetic wave is inputted, a second input terminal to which pulse voltage is inputted, a mixing output terminal from which the pulse voltage and the electromagnetic wave are outputted, a bar-shaped first conductive member of which one end is electrically connected to the second input terminal and the other end is electrically connected to an inner conductor of the mixing output terminal, a cylindrical second conductive member which surrounds the first conductive member with a gap therebetween and is disposed coaxially with the first conductive member and electrically connected to an inner conductor of the first input terminal, and a cylindrical third conductive member which houses the first conductive member and the second conductive member with a gap between the second conductive member and the third conductive member and is disposed coaxially with t

Abstract: A high frequency switch device includes a branch transmission line corresponding to each output terminal provided with a switching part. In the branch transmission line, the switching part includes a transmission side diode provided in such a manner that a cathode thereof is arranged on a side of an input terminal 41 and an anode thereof is arranged on a side of the output terminal, and a ground side diode provided in such a manner that a cathode thereof is grounded and an anode thereof is electrically connected between the output terminal and the transmission side diode in the branch transmission line. The branch transmission line includes a first capacitor and a second capacitor on the side of the output terminal from the transmission side diode in such a manner that the anode of the ground side diode is connected between the first capacitor and the second capacitor.

Abstract: To suppress the reflection of an electromagnetic wave from a load in a plasma generation device 30 that generates electromagnetic wave plasma by emitting the electromagnetic wave to a combustion chamber 10 of an engine 20. The plasma generation device 30 includes an electromagnetic wave oscillator 33 that oscillates the electromagnetic wave, an antenna 15a for emitting the electromagnetic wave oscillated by the electromagnetic wave oscillator to the combustion chamber 10 of the engine 20, and a stub adjustment unit 52, 53. The stub 51 is provided on a transmission line 60 for electromagnetic wave from the electromagnetic wave oscillator 33 to the antenna 15a. While the engine 20 is operating, the stub adjustment unit 52, 53 adjusts a short circuit location on the stub 51 based on the intensity of a reflected wave of the electromagnetic wave reflected from the antenna 15a.

Abstract: An engine control device 13 that cannot output a control signal to an electromagnetic wave emission device 30 is used to emit electromagnetic wave at an appropriate timing from the device 30 to a combustion chamber 10. A signal processing device 40 is connected to the engine control device 13 that outputs an ignition signal for instructing an ignition device 12 of the engine 20 to ignite fuel air mixture in the combustion chamber 10 of the engine 20. The signal processing device 40, upon receiving the ignition signal, outputs to the electromagnetic wave emission device 30 an electromagnetic wave drive signal that determines based on the ignition signal an emission period, which is a period for the electromagnetic wave emission device 30 to emit an electromagnetic wave to the combustion chamber 10, so that an ignition operation is performed during the emission period of the electromagnetic wave.

Abstract: There is provided an ignition or plasma generation apparatus that eliminates the need for resonance means in a combustion chamber and simplifies the electrode structure within the combustion chamber in an instance where energy from each of a spark discharge and microwaves is used to ignite an air-fuel mixture gas in an internal combustion engine. The ignition or plasma generation apparatus includes a mixing circuit for mixing a high-voltage pulse from a high-voltage pulse generator and microwave energy from a microwave generator; and an ignition plug into which an output from the mixing circuit is supplied, the plug used for introducing the output into a combustion chamber of an internal combustion engine. The output supplied from the mixing circuit to the ignition plug is supplied in a manner in which the microwave energy and the high-voltage pulse are superimposed on each other on a same transmission line.