baber/WOPTO huggingface dataset:
Patent JP-2019513200-A (JP)
Title: 軸方向推力補償付きラジアルターボ機械
IPC: F04D29/44
Filed: 2017-03-29
Abstract: 本発明は、推力補償付きラジアルターボ機械に関し、このラジアルターボ機械は、固定ケーシング（３）と、中心軸（Ｘ−Ｘ）の周りで固定ケーシング（３）内に配置された複数の同心の主要羽根付きリング（９’、９”、９'''、９''''）と、中心軸（Ｘ−Ｘ）の周りで主要羽根付きリング（９'，９''，９'''，９''''）と交互に径方向に固定ケーシング（３）内に配置された複数の同心の補助羽根付きリング（１５'，１５''，１５'''）と、を備える。ロータディスク（６，６'）およびロータディスク（６，６'）と一体の回転シャフト（４，４'，４''）を備えるロータ（２，２'）は、固定ケーシング（３）内で中心軸（Ｘ−Ｘ）の周りを回転可能であり、前面（７，７）で主要羽根付きリング（９'，９''，９'''，９''''）を担持する。主要羽根付きリング（９’、９”、９'''、９''''）および補助羽根付きリング（１５'，１５''，１５'''）は、異なる圧力において、複数の同心前方主要チャンバ（３０，３３，３５，３６）をロータディスク（６，６'）で区切っている。複数の同心後方環状主要チャンバ（４１'，４１''，４１'''，４１''''）は、各々が、前方主要チャンバ（３０，３３，３５，３６）と同一圧力で、それぞれの前方主要チャンバ（３０，３３，３５，３６）と流体連通するが、ロータディスク（６，６'）の後面（８，８'）および固定ケーシング（３）の間で区切られている。後方環状主要チャンバ（４１'，４１''，４１'''，４１''''）の一つを区切るロータディスク（６，６'）の後方環状領域（Ａ_１ｐ，Ａ_２p，Ａ_３p， Ａ_４p，Ａ'_４p）は、それぞれの前方主要チャンバ（３０，３３，３５，３６）を区切るロータディスク（６，６'）の前方領域（Ａ_１f，Ａ_２f，Ａ_３f，Ａ_４f）に等しい又は実質的に等しく、各々の後方環状主要チャンバ（４１'，４１''，４１'''，４１''''）内の作動流体の圧力によって作用される力は、それぞれの前方主要チャンバ（３０，３３，３５，３６）内の作動流体の圧力によって作用される力を実質的に釣り合わせる。【選択図】 図１
Patent JP-2019504512-A (JP)
Title: プリント回路の表面仕上げ、使用方法、及びそれから製造されるアセンブリ
IPC: H05K3/34
Filed: 2017-01-09
Abstract: プリント回路基板（ＰＣＢ）及び半導体ウェーハの表面仕上げは、アルミニウム又は銅の導電金属表面上に配置されたニッケルを含む。バリア層／無電解ニッケル（ＢＬＥＮ）表面仕上げを製造するために、窒素含有分子の全て又は一部を含むバリア層がニッケル層の表面上に堆積される。バリア層は、表面仕上げ上ではんだをリフローさせることができる。場合によっては、金（例えば、浸漬金）をバリア層上にコーティングして、ニッケル／バリア層／金（ＮＢＧ）表面処理を作製することができる。バリア層の存在により、表面処理を従来の無電解ニッケル／浸漬金（ＥＮＩＧ）表面仕上げよりも滑らかにさせる。バリア層の存在により、その後に施されるはんだ接合部を従来のＥＮＩＧよりも強く、脆性破壊をしにくくさせる。【選択図】図３
Patent JP-2019503470-A (JP)
Title: 弾頭
IPC: B22F5/00
Filed: 2016-01-15
Abstract: 前方領域（２）、後方領域（３）、外壁部分（４）、内壁部分（５）および中央空洞（６）を有する管状構造体を含む弾頭（１）であって、それにより、外壁部分（４）が、非球形を有する多数の予備成形された第１の破砕要素（７）および回転楕円形状を有する多数の非凝集の予備成形された第２の破砕要素（９）を含む弾頭（１）。
Patent JP-2019514612-A (JP)
Title: ハウジング構成要素及びその製造方法
IPC: A61N1/375
Filed: 2017-05-11
Abstract: 【課題】本発明の目的は、生体適合性の度合いを確実に高めると同時に、十分な安定性及び動作安全性を有するハウジング構成要素、特に植込み型装置のためのハウジング構成要素を提供することである。【解決手段】植込み型装置のための本発明によるハウジング構成要素は、電磁波を伝搬するための窓型開口部を備えた少なくとも１つのハウジング壁部分を備え、前記窓型開口部は、電磁波に対して透過性を有する材料で作られたブランクを成形した結果として密封される。【選択図】 図１
Patent JP-2019511901-A (JP)
Title: バルブアクチュエータ
IPC: H02M3/28
Filed: 2016-03-11
Abstract: 特に、安全シャットオフ機能を有するガス弁（１１）に適したバルブアクチュエータ（１０）は、ギア部（１５）を介してバルブを開閉する電気モータ（１２）を備える。電圧供給デバイス（１９）は、電気モータ（１２）の動作のために含まれ、入力整流器回路と、例えば、コンデンサＣとを有する。コンデンサＣに蓄えられた電圧から、電気モータ（１２）を動かすためのエネルギーを取得する。電源電圧が切れた後、バルブ（１１）があまりにも長い間開弁したままにならないように、スイッチオフデバイス（３４）が設けられ、電圧がなくなった後に、電気モータ（１２）へのエネルギーの流れを断つ。このように、バルブアクチュエータは、かなり広範囲な動作電圧用に設計することができ、使用電圧の大きさにかかわらず、一様に短い閉弁時間が保証される。 【選択図】図１
Patent JP-2019521901-A (JP)
Title: 発射式自動車用安全警告標識及びその発射システム
IPC: F41B11/80
Filed: 2018-01-24
Abstract: 本発明は、発射式自動車用安全警告標識及びその発射システムに関する。警告標識は、自由状態での転がりが抑制される多面体構造を有し、且つ、外力が加わることで管状の収納状態に収束可能であるとともに、外力が除去されると自動的に解放されて多面体構造となり、当該多面体構造の表面に警告マークが設けられている。発射システムは、警告標識と、内部空間を有する発射管と、発射管の端部に連通する圧力容器と、発射管と圧力容器の間に設けられる電磁弁と、電磁弁に電気的に接続される制御装置と、を含み、発射管にはピストンが設けられている。自動車の走行中に突発的状況が発生した場合、運転者は制動するとともに発射システムを起動することで、安全警告標識を発射させて制動開始位置付近に止めることができる。安全警告標識の位置と自動車の停止位置の間には一定の距離が存在するが、運転者は停車後に警告標識を取り出してこの距離を歩く必要がないため、後続車に対し迅速且つ効果的に警告を発することができる。結果、追突事故の発生確率が減少する。【選択図】図１
Patent JP-2019058189-A (JP)
Title: Methods for engineering allogeneic and immunosuppressive resistant t cell for immunotherapy
Inventor: ROMAN GALETTO
IPC: A61K38/13
Filed: 2019-01-04
Abstract: To provide methods for developing engineered T-cells for immunotherapy that are both non-alloreactive and resistant to immunosuppressive drugs.SOLUTION: The present invention relates to methods for modifying T-cells by inactivating both genes encoding target for an immunosuppressive agent and T-cell receptor, in particular genes encoding CD52 and TCR.SELECTED DRAWING: Figure 1
Patent JP-2020108673-A (JP)
Title: Slot machine
Inventor: OGURA TOSHIO
IPC: A63F5/04
Filed: 2019-01-07
Abstract: To provide a slot machine facilitating work when shifting to a game state in which an imparting rate of a game value is appropriate.SOLUTION: In a configuration in which a putout rate of tokens does not become appropriate within RT2 (within BB2) in which winning of BB2 to be determined on condition of setting of three betting numbers is carried over, and a putout rate of tokens becomes appropriate within RT1 (within BB1) in which winning of BB1 to be determined on condition of setting of two betting numbers is carried over, when a setting value is set in BB1 to be shifted by winning of BB2 and BB1 to be shifted by winning RT2 (within BB2) and BB2, a shift is performed to RT0 (not within the inside) in which winning of BB1 or BB2 is not carried over, and RT1 (within BB1) is maintained when a setting value is set in RT1 (within BB1).SELECTED DRAWING: Figure 8
Patent JP-2020112603-A (JP)
Title: Method of producing micro display substrate
Inventor: TOBISAKA YUUJI
IPC: G02F1/1343
Filed: 2019-01-08
Abstract: To produce a transmission type micro display substrate without providing a light blocking layer.SOLUTION: A method of producing a micro display substrate comprises: (i) a step of forming a circuit layer on a first substrate surface comprising a single crystal silicon layer; (ii) a step of to adhere a second substrate to a surface of the first substrate on which the circuit layer has been formed, using an adhesive agent; (iii) a step of thinning a rear surface of the first substrate; (iv) a step of adhering a third substrate being a transparent substrate to the thinned surface of the first substrate, using an adhesive agent; (v) a step of removing the second substrate from the first substrate; and (vi) a step of removing the adhesive agent on the first substrate surface from which the second substrate has separated to expose a surface of the circuit layer. The step (i) comprises a step of sequentially forming an active layer, a gate layer and a wiring layer, the wiring layer being provided in a positional relationship that blocks the active layer and the gate layer from incident light.SELECTED DRAWING: Figure 1
Patent JP-2020112672-A (JP)
Title: Voice recognition device, server, program and incentive-imparting method
Inventor: SATO MAIHA
IPC: G06F3/16
Filed: 2019-01-11
Abstract: To provide a voice recognition device using a wake word and giving a merit to a user and to provide a server, a program and an incentive-imparting method.SOLUTION: A voice recognition device 1 comprises: a wake word setting section 19 for setting a wake word in accordance with user operation; a voice recognition section 16; a count section 1A for counting the number of recognition times of the wake word by the voice recognition section 16; and a transmission control section 15 for transmitting information indicating the counted number of times. An incentive corresponding to the number of recognized times is associated with the wake word.SELECTED DRAWING: Figure 1
Patent JP-2020112429-A (JP)
Title: Slag quantification method
Inventor: SOYA Katsuhide
IPC: C21C7/00
Filed: 2019-01-11
Abstract: To provide a technique capable of quantifying slag.SOLUTION: A slag quantification method comprises: a luminance value calculation step of capturing an image of a molten metal surface of molten metal stored in a container by an imaging device and calculating a luminance value in each pixel region of the captured image by image processing; a slag surface temperature calculation step of preliminarily acquiring a relation between the luminance value and radiance and, from the relation and a temperature conversion formula, calculating a surface temperature of the slag in each pixel region by using the luminance value calculated in the luminance value calculation step; a slag thickness calculation step of estimating the thickness of the slag for each pixel by the slag surface temperature for every pixel region calculated by the slag surface temperature calculation step and a heat conduction equation; and a slag calculation step of calculating a slag volume or a slag total weight in the container on the basis of the molten metal surface area per one pixel region and the slag physical property value.SELECTED DRAWING: Figure 2
Patent JP-2020113475-A (JP)
Title: Waterproof structure
Inventor: IIZUKA JUNJI
IPC: H01R13/52
Filed: 2019-01-15
Abstract: To provide a waterproof structure capable of preventing a poor appearance or wire breakage of a coated wire, and degradation in a waterproof function caused by creases on a coating.SOLUTION: A waterproof structure comprises: a seal part 25 which is formed of an insulative elastic member covering the periphery of a coated wire 15 inserted through a fitting hole of a fitted part; a housing 13 which is formed of insulation resin, having rigidity higher than that of the elastic member, which is provided on a terminal part of the coated wire 15 in a manner covering the seal part 25; and a burr removing part 27 formed of an insulative elastic member which is provided continuously with one end part of the housing 13 so as to cover the periphery of the coated wire 15.SELECTED DRAWING: Figure 2
Patent JP-2020115105-A (JP)
Title: Magnetic detection device
Inventor: UNNO AKIHIRO
IPC: G01R33/09
Filed: 2019-01-18
Abstract: To provide a magnetic detection device capable of suppressing influence of disturbance magnetic field.SOLUTION: A magnetic detection device 1 detects a magnetic field change generated by a measuring object 70. The magnetic detection device 1 includes: a coil 5 which generates alternating magnetic field; a sensor section 30 including a magneto-resistance effect element to which a magnetic filed generated by the coil 5 is applied; and a magnetic body 7 which is provided on an inner peripheral side of the coil 5 and surrounds the sensor section 30 inside. The coil 5 has a cylindrical shape extending parallel to its own circulation shaft. The sensor section 30 exists inside the coil 5 and within a length range of the coil 5. The magnetic body 7 has a cylindrical shape substantially parallel to the circulation shaft of the coil 5. The magnetic body 7 is longer than the coil 5 in the circulation shaft direction of the coil 5. In the coil 5 and the magnetic body 7, one end on the measuring object 70 side in the circulation shaft direction of the coil 5 is located at mutually the same position in the circulation shaft direction. The sensor section 30 is provided closer to one end near the measuring object 70 of the coil 5.SELECTED DRAWING: Figure 1
Patent JP-2020119749-A (JP)
Title: Illuminating device
Inventor: KIKA MANABU
IPC: F21V19/00
Filed: 2019-01-23
Abstract: To provide an illuminating device that has excellent workability when a light source unit is attached to an appliance body.SOLUTION: An illuminating device 10 comprises an appliance body 20 comprising a top plate part to be attached to an installation part. The illuminating device also comprises: a light source unit 40 attached to the appliance body 20, and comprising a back member on the side opposite to a direction in which light of a light source module is applied; and a position regulating member existing between the top plate part and the back member.SELECTED DRAWING: Figure 1
Patent JP-2020117472-A (JP)
Title: Cyclic azine compound, organic electroluminescent element material, electron transport material for organic electroluminescent element, and organic electroluminescent element
Inventor: HATTORI KAZUKI
IPC: C07D401/10
Filed: 2019-01-25
Abstract: To provide a cyclic azine compound that is excellent in long service life and current efficiency, has low crystallinity, and contributes to forming a stable amorphous film.SOLUTION: A cyclic azine compound has a specific structure represented by formula (1).SELECTED DRAWING: Figure 1
Patent JP-2020122493-A (JP)
Title: Ball bearing
Inventor: KAWAGUCHI HAYATO
IPC: F16C33/66
Filed: 2019-01-29
Abstract: To suppress deformation of a holder due to centrifugal force and suppress shear resistance of lubricant between a pocket part and a ball, in a ball bearing having such a shape that the pocket part of a resin holder is opened on one side surface in an axial direction.SOLUTION: A bearing ring 1 has a locking part 1b that protrudes in a radial direction at a position on the other side in an axial direction with respect to a raceway surface 1a. A holder 3 has an engaging part 3b arranged so as to be engageable with the locking part 1b toward the other side in the axial direction. When an axial depth of a pocket part 3a of the holder 3 is defined as H and a diameter of a ball 4 is defined as d, 0.15d≤H≤0.65d is set. The engaging part 3b is arranged at a position on the other side in the axial direction with respect to the plurality of pocket parts 3a.SELECTED DRAWING: Figure 1
Patent JP-2020120634-A (JP)
Title: Plate body for plant decorative body, plant decorative body and production method thereof
Inventor: AMANO SHINOBU
IPC: A01G9/02
Filed: 2019-01-31
Abstract: To provide a plate body for plant decorative body using Western orchid and sphagnum moss.SOLUTION: A plate body of the invention is a plate body formed by burning china clay, Western orchid can be attached to the plate body by a thread 3, a surface of the plate body is subjected to surface treatment for allowing adhesion of aerial plants 1, and a rear surface of the plate body is subjected to irregularity processing.SELECTED DRAWING: Figure 7
Patent JP-2020069468-A (JP)
Title: System for treating sludge-drying carrier gas
Inventor: TOZAKI MASAHIRO
IPC: C02F11/12
Filed: 2019-02-07
Abstract: To provide a system for treating sludge-drying carrier gas, in which the sludge-drying carrier gas, after drying the sludge, can be treated without requiring moisture-reducing equipment.SOLUTION: The system is provided with a sludge dryer 30 in which sludge-drying carrier gas is introduced along with the sludge to be dried, from which dried sludge is discharged, and from which sludge-drying carrier gas containing moisture evaporated in the course of drying of the sludge; an incubator 2 having a combustion chamber 13 for burning a mixture of dried sludge and combustible waste discharged from the sludge dryer 30; a gas supply channel 81 to 84 for supplying the sludge-drying carrier gas discharged from the sludge dryer 30 to a secondary combustion chamber 15: and carrier gas heating means (70, 85) for raising the temperature of the sludge-drying carrier gas flowing through the gas supply channels 81 to 84.SELECTED DRAWING: Figure 1
Patent JP-2020129869-A (JP)
Title: Mobile-terminal charging apparatus
Inventor: KATSUBE MAKOTO
IPC: H01L41/053
Filed: 2019-02-07
Abstract: To provide a mobile-terminal charging apparatus capable of charging a mobile terminal equipped with a charge unit by a simple manual operation.SOLUTION: A mobile-terminal charging apparatus 20 includes a housing 22 which is attached to a mobile terminal 100 equipped with a battery 102, a cantilever-type elastic plate 24 which is provided to the housing 22 and one end 24A side of which is fixed to the mobile terminal 100, a substrate 26 which is opposingly disposed in the plate thickness direction of the elastic plate 24 and which has flexibility, a sheet-like piezoelectric member 28 which is held between the substrate 26 and the elastic plate 24, a grip member 30 which is one example of an operation member that is provided to the housing 22 and causes power generation by deforming the piezoelectric member 28 together with the substrate 26 and the elastic plate 24 by a manual operation, and a connection device 32 that electrically connects the piezoelectric member 28 to the battery 102.SELECTED DRAWING: Figure 2
Patent JP-2019106199-A (JP)
Title: Management of transaction with security protection between electronic device and service provider
Inventor: MATTHEW C BYINGTON
IPC: G06Q20/38
Filed: 2019-02-12
Abstract: To provide a system for, a method of, and a computer-readable medium for use in managing a security-protected transaction between an electronic device and a service provider.SOLUTION: An implementation entity subsystem 400 can receive device order data from an electronic device 100. The received device order data indicates an order for a value item of a service provider subsystem 200 stored in an electronic device. The implementation entity subsystem, based on the received device order data, can transmit an implementation order data to the service provider subsystem. The implementation order data indicates an order to the value item. The implementation entity subsystem, based on the transmitted implementation order data, can receive a service provider performance data from the service provider subsystem. The service provider performance data includes the value item.SELECTED DRAWING: Figure 1
Patent JP-2020128858-A (JP)
Title: Air conditioner
Inventor: SANADA SHINTARO
IPC: F25B43/00
Filed: 2019-02-12
Abstract: To provide an air conditioner capable of securing a refrigerant circulation amount necessary for a heating operation in returning to the heating operation from a defrosting operation.SOLUTION: A second opening/closing valve 29b is closed while driving a compressor 21, and keeping valves excluding the second opening/closing valve 29b in a state same as that in a defrosting operation, after termination of the defrosting operation. By driving the compressor 21 while closing both of a first opening/closing valve 29a and the second opening/closing valve 29b, a liquid refrigerant accumulated in a gas-liquid separator 28 flows out from the gas-liquid separator 28 to a second liquid branch pipe 68. Further as a second expansion valve 27b is fully opened, a gas refrigerant accumulated in the gas-liquid separator 28 flows out from the gas-liquid separator 28 to a bypass pipe 69, and is sucked into the compressor 21. After the lapse of a prescribed time from the termination of the defrosting operation, the first opening/closing valve 29a is opened in a state of closing the second opening/closing valve 29b, while fully opening both of a first expansion valve 27a and the second expansion valve 27b.SELECTED DRAWING: Figure 2
Patent JP-2020134021-A (JP)
Title: Outdoor unit
Inventor: KOBAYASHI HIDEHISA
IPC: F24F1/22
Filed: 2019-02-20
Abstract: To enable the elimination of a problem of a communication unit arranged at a position exposing from an outdoor unit housing and a problem of a setting display circuit mounted on a control board all at once.SOLUTION: A control board 240 is attached to the side of a service panel 112 of an electrical equipment module 200, a surface mounting type communication unit 241 for performing radio communication with an information terminal 300 within a close range is mounted on the control board 240, and the communication unit 249 includes a system for performing pairing for causing at least one indoor unit and an outdoor unit to be communicable.SELECTED DRAWING: Figure 3
Patent JP-2020134761-A (JP)
Title: Lens unit and camera module
Inventor: AMANO KOSUKE
IPC: G02B7/02
Filed: 2019-02-21
Abstract: To provide a lens unit which allows a specific lens unit disposed between a most image-side lens and a most object-side lens to be arranged inside a lens barrel while being restricted by an inner surface of the lens barrel even when a lens diameter of the specific lens is smaller than that of a lens next to the specific lens on the image side, and offers improved optical design flexibility.SOLUTION: A lens unit 100 is configured such that an image-side end 17a of a first lens barrel 10 and an object-side end 21 of a second lens barrel 20 are fitted together, and that a lens diameter of a first lens 1 located on the most object side in the first lens barrel 10 is greater than that of a third lens 3 located on the most image side in the first lens barrel 10, and a lens diameter of a fourth lens 4 located on the most object side in the second lens barrel 20 is greater than that of the third lens 3 located on the most image side in the first lens barrel 10.SELECTED DRAWING: Figure 1
Patent JP-2020136638-A (JP)
Title: Manufacturing method of insulating circuit board
Inventor: MORITA YUMA
IPC: H01L23/12
Filed: 2019-02-26
Abstract: To provide a manufacturing method of an insulating circuit board, which comprises a ceramic substrate and a circuit layer having a circuit pattern, and can form the narrow-pitched circuit pattern in the circuit layer with high dimensional accuracy.SOLUTION: A manufacturing method of an insulating circuit board includes a circuit pattern forming step S02 of forming a circuit pattern in a metal member layer which is formed on one side of a ceramic substrate. The circuit pattern forming step S02 includes: a resist film forming step S21 of depositing an etching resist film over entire one side of the metal member layer; a laser processing step S22 of irradiating the metal member layer in which the etching resist film is formed, with a laser beam and removing the etching resist film and the metal member layer partially in a thickness direction, thereby forming the circuit pattern; an etching step S23 of etching and removing the remaining metal member layer; and a resist film removing step S24 of removing the remaining etching resist film.SELECTED DRAWING: Figure 3
Patent JP-2020139968-A (JP)
Title: Display device
Inventor: MORINAGA JUNICHI
IPC: G02F1/1368
Filed: 2019-02-26
Abstract: To reduce the signal distortion of an image wire.SOLUTION: A display device 10 comprises: a long pixel electrode 12; a switching element 11 which is connected to the pixel electrode 12; a scan wire 13 which extends along the longitudinal direction of the pixel electrode 12, is connected to the switching element 11 and transmits a signal for driving the switching element 11; an image wire 14 which extends along the short side direction of the pixel electrode 12, is connected to the switching element 11 and transmits a signal for charging the pixel electrode 12; a liquid crystal layer 10C which contains liquid crystal molecules; a plurality of domains PXD which have the different alignment directions of the liquid crystal molecules when the voltage is applied to the liquid crystal layer 10C; an alignment boundary part 25 which is located on the boundary of the plurality of domains PXD; an alignment film 10E which aligns the liquid crystal molecules; and a capacity wire 26 which extends along the short side direction, and is arranged so as to be overlapped on the pixel electrode 12 through insulation films 22, 23 and to be overlapped on at least a portion of the alignment boundary part 25.SELECTED DRAWING: Figure 2
Patent JP-2020140001-A (JP)
Title: Mode branch device
Inventor: SAKAMOTO YASUSHI
IPC: G02B6/12
Filed: 2019-02-27
Abstract: To provide a mode branch device using a parallel waveguide structure, the device being capable of flexibly setting a mode branch ratio.SOLUTION: The mode branch device according to the present disclosure enters an LP01 mode from a first port of a first waveguide 101 and a second port of a second waveguide 102, connects the LP01 mode entered from the second port to the LP11 mode of the first waveguide in connection parts 103 and 104, and emits the LP01 mode and the LP11 mode from a third port of the first waveguide 101. A waveguide length difference ΔL is generated in the first and second waveguides between the two connection parts 103 and 104 and is adjusted so that the mode branch ratio of the LP11 mode emitted from the third port to the LP01 mode emitted from the second port can be set to a desired value.SELECTED DRAWING: Figure 4
Patent JP-2020145770-A (JP)
Title: Control method of full-bridge circuit
Inventor: HANEDA SHOJI
IPC: H02M7/48
Filed: 2019-03-04
Abstract: To provide a control method for reducing power loss of a full-bridge circuit.SOLUTION: In a control method of a full-bridge circuit having a first leg where two switching elements are connected in series and a second leg where two switching elements are connected in series, one of the two switching elements positioned on one opposite angle is on/off controlled by a first control signal having a prescribed duty ratio, the other is on/off controlled by a second control signal having an on-period longer than the on-period of the first control signal, one of two switching elements positioned on the other opposite angle is on/off controlled by a third control signal with the same duty ratio as that of the first control signal and with a different phase by 180°, and the other is on/off controlled by a fourth control signal with the same duty ratio as that of the second control signal and with the different phase by 180°.SELECTED DRAWING: Figure 1