Mitsubishi Denki Kabushiki Kaisha

Ricoh Company, Ltd.

The University of Tokyo

Dowa Electronics Materials Co., Ltd.

Kabushiki Kaisha Toshiba

Mitsubishi Electric Corporation

Takashi Gotoh

Takayuki Yoshida

Tsuneo Yumikura

Michimasa Takeshita

Kaoru Ikejima

Hitoshi Iijima

Yoshiaki Tanimura

Kazuyuki Matsumoto

Hiroshi Hachiya

Shin-ichi Ohkoshi

Asuka Namai

Shunsuke Sakurai

Atsushi Motizuki

Yuji Sueto

Sayaka Umeda

Kiyoshi Kobayashi

An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.

Method for improving coercive force of epsilon-type iron oxide, and epsilon-type iron oxide

To provide a method for improving a coercive force of epsilon-type iron oxide particles, and an epsilon-type iron oxide. Specifically, to provide a method for improving the coercive force of an epsilon-type iron oxide comprising: substituting Fe-site of the epsilon-type iron oxide with other element, while not substituting Fe of D-site in the epsilon-type iron oxide with other element, and the epsilon type iron oxide.

A disclosed switching regulator includes a speed-up circuit for speeding up an operation of an error amplifier circuit during the time starting from when a switching element is turned OFF based on an output of an abnormality detection circuit, or starting from a fixed period of time after the switching element is turned OFF based on the output of the abnormality detection circuit, until the next time the switching element is again turned OFF based on an output of a PWM comparison circuit.

Switching regulator

The base of an actuator housingis arranged to face the side of a turbine housing, and a motoris fixed to a motor support post that is protrusively provided toward the top of the actuator housingsuch that the motoris kept at a distance from the turbine housing.

Electronically controlled actuator

An error amplification circuit includes an integrated circuit and a phase compensation capacitor. The integrated circuit includes an error amplifier to amplify a difference between a predetermined reference voltage and an input feedback voltage for output; a current generator circuit to generate a bias current for supply to the error amplifier; a phase compensation resistor; a bias-current control terminal; and a phase compensation terminal connected to an output terminal of the error amplifier via the phase compensation resistor. The phase compensation capacitor is connected to the phase compensation terminal, the phase compensation capacitor being provided outside the integrated circuit.

Error amplification circuit, control method for error amplification circuit, and switching regulator employing error amplification circuit

A soft-start circuit to generate and output a soft-start voltage having a specified gradient. The soft-start circuit includes a slope voltage generator circuit to generate and output multiple slope voltages having different specified gradients, including a steepest slope voltage whose gradient is steepest among the gradients of the multiple slope voltages and a mildest slope voltage whose gradient is mildest thereamong, at least one voltage conversion circuit to receive the slope voltages and output a voltage whose gradient is milder than the gradient of the steepest slope voltage, and a selection circuit to receive at least one specified reference voltage and the voltage generated by the voltage conversion circuit, compare the voltage by the voltage conversion circuit with the specified reference voltage, and output either the voltage or the specified reference voltage as the soft-start voltage in accordance with a comparison result generated by the selection circuit.

Soft-start circuit and power supply circuit including same

An elevator control panel device, including an elevator control panel disposed in a doorjamb forming an entrance to the elevator in a building, a panel door rotatably pivoted via a hinge at a hinge side of the panel door and providing access to the control panel, an automatic closing mechanism configured to force the panel door in the closing direction so as automatically to close the panel door when the panel door is open, and at least one lock provided for locking the panel door at an opposite side of the panel door opposite to the hinge side of the panel door, a first member mounted on the panel door, and a second member mounted on the doorjamb, the first member being configured to engage the second member in a locked state automatically upon closing of the panel door.

Elevator control panel device

A plurality of heat transfer tubes are disposed at certain intervals, in-tube operating fluid (such as coolant) passes therethrough, and a plurality of small-gage wires are used as a heating fin. One small-gage wire is wound at a pair of heat transfer tubes,and,in a spiral manner, and another small-gage wire is wound at a pair of heat transfer tubes,and,in the spiral manner, and still another small-gage wire is wound at a pair of heat transfer tubes,and,in the spiral manner. Thereby, while higher heat transfer coefficient can be achieved, and a heating surface area is ensured, clogging can be avoided even when moisture in air condenses on a surface of a heat exchanger. As a result, it is possible to realize a high-performance and compact heat exchanger used for air conditioning.

Heat exchanger, refrigeration system, air conditioner, and method and apparatus for fabricating heat exchanger

A heat exchanger for an air conditioner comprises a plurality of heat-transfer tubes arranged in parallel to each other at predetermined intervals, and heat-transfer fins formed by helically winding a plurality of fine wires around the plurality of heat-transfer tubes. Preferably, the heat-transfer tubes are divided into groups of two adjacent heat-transfer tubes (1a, 1b), (1b, 1c), (1c, 1d), . . . , and at least one fine wire fin is wound helically around the two adjacent heat-transfer tubes of each group so that the fine wire fin does not cross other portions of the fine wire fin as viewed along a direction perpendicular to a plane including the axes of the plurality of heat-transfer tubes. When fabricating the heat exchanger, at least either the outer circumferences of the heat-transfer tubes or the outer circumferences of the fine wires are coated with a metal film formed by plating, and then the heat-transfer tubes and the fine wires are interlaced to form a heat exchanging structure. Then, the heat exchanging structure is heated to the melting point of the metal film so that the metal film is melted and the heat-transfer tubes and the fine wires are bonded together by the molten metal film.

Heat exchanger for air conditioner and method of fabricating the heat

A heat exchanger for an air conditioner includes a plurality of heat-transfer tubes arranged in parallel to each other at predetermined intervals, and heat-transfer fins formed by helically winding a plurality of fine wires around the plurality of heat-transfer tubes. Preferably, the heat-transfer tubes are divided into groups of two adjacent heat-transfer tubes (1a, 1b), (1b, 1c), (1c, 1d), . . . , and at least one fine wire fin is wound helically around the two adjacent heat-transfer tubes of each group so that the fine wire fin does not cross other portions of the fine wire fin as viewed along a direction perpendicular to a plane including the axes of the plurality of heat-transfer tubes. When fabricating the heat exchanger, at least either the outer circumferences of the heat-transfer tubes or the outer circumferences of the fine wires are coated with a metal film formed by plating, and then the heat-transfer tubes and the fine wires are interlaced to form a heat exchanging structure. Then, the heat exchanging structure is heated to the melting point of the metal film so that the metal film is melted and the heat-transfer tubes and the fine wires are bonded together by the molten metal film.

Method of fabricating a heat exchanger for an air conditioner

A plurality of heat transfer tubes are disposed at certain intervals, in-tube operating fluid (such as coolant) passes therethrough, and a plurality of small-gage wires are used as a heating fin. One small-gage wire is wound at a pair of heat transfer tubes 1a and 1c in a spiral manner, and another small-gage wire is wound at a pair of heat transfer tubes 1b and 1c in the spiral manner, and still another small-gage wire is wound at a pair of heat transfer tubes 1b and 1d in the spiral manner. Thereby, while higher heat transfer coefficient can be achieved, and a heating surface area is ensured, clogging can be avoided even when moisture in air condenses on a surface of a heat exchanger. As a result, it is possible to realize a high-performance and compact heat exchanger used for air conditioning.

Heat exchanger, refrigeration system, air conditioner, and method and

Heat exchanger and method of fabricating the heat exchanger

A heat exchanger mounted in an air condition is constructed such that at least one row of heat conduction pipe groups are arranged across an air passage. Each heat conduction pipe group is constructed such that a plurality of heat conduction pipes 22 are arranged in parallel with each other and a fine wire 23 made of a metallic material having excellent heat conductivity is spirally wound around each adjacent heat conduction pipe 22. Thus, the performance of the heat exchanger can be improved without the air conditioner being designed with larger dimensions. In addition, the heat exchanger includes a plurality of heat conduction pipes 39 arranged in the form of at least one row with a constant distance between adjacent pipes, and a plurality of twisted wires 40. The twisted wires 40 are arranged so as to alternately come in contact with one side and opposite side of each heat conduction pipe 39 extending at a right angle relative to the row direction of each heat conduction pipe 39, and moreover, alternately come in contact with one side and opposite other side of each heat conduction pipe 39 extending in the longitudinal direction. With this construction, high heat conductivity can be realized, and an occurrence of clogging with dew droplets can be prevented while maintaining a heat transfer surface area.

Air conditioner and heat exchanger used therefor

A heat exchanger mounted in an air conditioner is constructed such that at least one row of heat conduction pipe groups are arranged across an air passage. Each heat conduction pipe group is constructed such that a plurality of heat conduction pipes 22 are arranged in parallel with each other and a fine wire 23 made of a metallic material having excellent heat conductivity is spirally wound around each adjacent heat conduction pipe 22. Thus, performances of the heat exchanger can be improved without a possibility that the air conditioner is designed with larger dimensions. In addition, the heat exchanger includes a plurality of heat conduction pipes 39 arranged in the form of at least one row with a constant distance between adjacent ones and a plurality of twisted wires 40. The twisted wires 40 are arranged so as to alternately come in contact with one side and opposite side of each heat conduction pipe 39 extending at a right angle relative to the row direction of each heat conduction pipe 39, and moreover, alternately come in contact with one side and opposite other side of each heat conduction pipe 39 extending in the longitudinal direction. With this construction, high heat conductivity can be realized, and an occurrence of clogging with condensation can be prevented while improving heat conduction.

A heat exchanger mounted on an air condition is constructed such that at least one row of heat conduction pipe groups are arranged across an air passage. Each heat conduction pipe groups is constructed such that a plurality of heat conduction pipes 22 are arranged in parallel with each other and a fine wire 23 made of a metallic material having excellent heat conductivity is spirally wound around each adjacent heat conduction pipes 22. Thus, performances of the heat exchanger can be improved without a possibility that the air conditioner is designed with larger dimensions. In addition, the heat exchanger includes a plurality of heat conduction pipes 39 arranged in the form of at least one row with a constant distance between adjacent ones and a plurality of twisted wires 40. The twisted wires 40 are arranged so as to alternately come in contact with one side and opposite side of each heat conduction pipe 39 extending at a right angle relative to the row direction of each heat conduction pipe 39, and moreover, alternately come in contact with one side and opposite other side of each heat conduction pipe 39 extending in the longitudinal direction. With this construction, high heat conductivity can be realized, and an occurrence of clogging with dew droplets can be prevented while maintaining a heat conduction area.

Growing community of inventors

Hyogo, Japan

Takashi Gotoh