baber/WOPTO huggingface dataset:
Patent JP-2007504792-A (JP)
IPC: H02M3/158
Filed: 2004-08-23
Abstract: A power delivery system for a microprocessor or other ASIC. The power delivery system includes a plurality of cascaded buck stages connected in series, wherein a last buck stage in the plurality of cascaded buck stages provides an output voltage Vo in response to an input voltage Vin applied to a first buck stage of the plurality of cascaded stages. A duty cycle control regulates a duty cycle of each buck stage to maintain the output voltage Vo. The duty cycle control sets the duty cycle of the first buck stage of the plurality of cascaded buck stages to 1 if an input-to-output voltage ratio (Vin/Vo) is lower than a threshold input-to-output voltage ratio RT.
Patent JP-2007504610-A (JP)
Title: 照明構造付きキーパッド
IPC: H01H/
Filed: 2004-08-24
Abstract: 照光式キーパッド（４００）は、複数の作動ボタン（４１２）を有する実質的に透明なキーパッド（４２０）と、前記複数の作動ボタンのほぼ下に対応して存在する複数のスイッチ（４０４）と、前記複数の作動ボタンと前記複数のスイッチとの間にある表示積層体層（４１５）と、前記実質的に透明なキーパッドを介して光を放射することによって前記積層体層上の記号のパターンを反射によって照明する光源（４１７）とを含んでいる。前記表示積層体は、前記実質的に透明なキーパッド上に表示されるべき前記記号のパターンに構成された導体パターンを有するドライバー層（４０６）と、透明導体層（４１０）と、前記透明導体層と前記ドライバー層に間に配置された電気的活性インク層（４０８）とを含むことができる。
Patent JP-2007503899-A (JP)
Title: 入れられたガスからの臭気の除去のための装置
IPC: B01D53/00
Filed: 2004-09-01
Abstract: 第１のセクション（１０）と第２のセクション（１１）とによって不快な臭気を除去するための装置である。第１のセクション中を、入れられたガスが移動され、また第１のセクションは、入れられたガス内の空気からオゾンを生成させることによって、入れられたガスを処理し、第２のセクションは、第１のセクションから出された空気流内の残ったオゾンを酸素に変換する。好ましくは、第１のセクション内でオゾンを生成するための手段は、第１の波長の紫外光であり、第２のセクション内でオゾンを生成するための手段は、異なる波長の紫外光である。
Patent JP-2007505119-A (JP)
Title: ３−（３−フルオロ−４−ヒドロキシフェニル）−７−ヒドロキシナフトニトリルの合成方法
IPC: C07C37/055
Filed: 2004-09-02
Abstract: 式Ｉ     ［式中、Ｒ １ はＣＮ、ＦまたはＣｌであり；Ｒ ２ はＨまたはＢｒであり；ならびにＲ ３ およびＲ ４ は各々独立してＨまたはＦである］ の化合物の製造方法。これらの化合物は、関節リウマチなどの慢性炎症性疾患の処置において有用である。
Patent JP-2007536204-A (JP)
Title: セリンプロテアーゼ、とりわけｈｃｖｎｓ３−ｎｓ４ａプロテアーゼの阻害剤
IPC: A61K38/04
Filed: 2004-09-17
Abstract: 本発明は、セリンプロテアーゼ活性、とりわけＣ型肝炎ウイルスＮＳ３−ＮＳ４Ａプロテアーゼの活性を阻害する、式Ｉ： 【化１】     の化合物またはその薬学的に許容される塩に関する。それら自体がＣ型肝炎ウイルスのライフサイクルに干渉するように作用し、そして抗ウイルス剤として有用である。本発明はさらに、生体外での使用のためのまたはＨＣＶ感染を有する患者に投与するための、前記化合物を含む薬学的に許容される組成物に、および前記化合物を製造するための方法に関する。本発明はまた、本発明の化合物を含む医薬組成物を投与することによる、患者のＨＣＶ感染を処置する方法に関する。
Patent JP-2007518219-A (JP)
Title: 可撓性成形ｅｌランプ
IPC: H01J63/04
Filed: 2004-09-24
Abstract: 可撓性ＥＬランプ（４３）は、リリース層（４７）に複数の層を重ねて付着させることにより作られる。ランプは実質的に剛性のある物品（４５）に成形され、ランプは該物品の表面の一部として残される。本発明の一実施形態によれば、ランプは物品の中を通じて発光する。別の実施形態によれば、ランプは、表面の露出された部分から発光する。成形されたＥＬランプは、実質的に平坦でもよく、３次元形状でもよい。ランプは、リリース層がある状態でも、ない状態でも成形される。 【選択図】図５
Patent JP-2007513799-A (JP)
Title: 光学多層
IPC: B32B27/06
Filed: 2004-10-13
Abstract: ゼロでない面外複屈折を有するポリマー基体及び非晶質ポリマーオーバーレイヤーを含んで成る光学多層であって、４００ｎｍ〜７００ｎｍの間の波長の光において−３０ｎｍ〜３０ｎｍの間に前記光学多層の全面外位相リターデーションを提供するように、前記非晶質ポリマーオーバーレイヤーが、１６０℃を超えるＴｇ値を有しかつ前記ポリマー基体の面外複屈折とは反対のその面外複屈折の符号を有している非晶質ポリマーを含んで成る光学多層。
Patent JP-2007512160-A (JP)
IPC: B29C49/00
Filed: 2004-11-19
Abstract: This invention relates to the preform to produce a plastic container for packaging foodstuffs, and especially to blow mould thin-walled containers which can be hermetically closed with a metal lid by double seaming. The preform (1) includes a body (4) and a convex hemispherical bottom (6). The body (4) has a conical shape that flares towards a cylindrical neck (2) surrounded by a flange (3) that terminates in a thickened rim (5). Preferably, the angle (α) at which the internal body surface (4) flares towards the cylindrical neck is greater than the angle (β) at which the external body surface (4) opens upwards, and the thickness (g2) of the cylindrical neck (2) is less than the thickness (g3) of the bottom (6).
Patent JP-2007513585-A (JP)
Title: Ｃｄｍａ２０００／ｇｐｒｓローミングに関する方法及び装置
IPC: H04W60/00
Filed: 2004-12-03
Abstract: 【課題】ＣＤＭＡ２０００／ＧＰＲＳローミングに関する方法及び装置 【解決手段】   モバイルＩＰｖ４を用いたＧＰＲＳフォーリンモード、シンプルＩＰｖ４又はＩＰｖ６を用いたＧＰＲＳフォーリンモード、モバイルＩＰｖ４を用いたＣＤＭＡ２０００パケットデータフォーリンモード、及びシンプルＩＰｖ４又はＩＰｖ６を用いたＣＤＭＡ２０００パケットデータフォーリンモード、等のＣＤＭＡ２０００／ＧＰＲＳローミングシナリオに関するインターワーキング・相互運用機能ＩＩＦアーキテクチャ及び対応する呼フローが提供される。 【選択図】図４Ａ
Patent JP-2007513695-A (JP)
Title: 吸引スリーブおよびかかる吸引スリーブを備えた処置装置
IPC: A61B18/00
Filed: 2004-12-03
Abstract: 吸引スリーブが、高温ガス、液体および／または他の吸引物を排出するためにＲＦ装置のシャフトに結合されている。吸引スリーブは上記シャフトの第１端とその作業素子（例えば、ＲＦ切断素子）との間のシャフト周りに同軸状に配置されるように構成される。吸引スリーブは作業素子近くに吸引口および複数の開口を備え、複数の開口を通して吸引し、吸引口を通して排出できるように構成される。 【選択図】図８
Patent JP-2007514075-A (JP)
Title: 紙コーティングでの使用のためのビニルアルコールとイタコン酸との共重合体
IPC: C08F216/06
Filed: 2004-12-15
Abstract: 本発明は、紙の表面をコーティングするために有用な組成物であって、４０重量％未満の水を含み、かつ、少なくとも約９５％加水分解されているポリビニルアルコール共重合体より本質的になる水溶液であるコーティング組成物、ならびにその調製方法である。
Patent JP-2007517781-A (JP)
Title: アルツハイマー病治療用のフェニルアミドおよびピリジルアミド系β−セクレターゼ阻害薬
IPC: C07D417/04
Filed: 2004-12-15
Abstract: 本発明は、β−セクレターゼ酵素の阻害薬であって、アルツハイマー病などのβ−セクレターゼ酵素が関与する疾患の治療において有用なフェニルアミドおよびピリジルアミド 誘導体化合物に関するものである。本発明はまた、それら化合物を含む医薬組成物ならびにβ−セクレターゼ酵素が関与するそのような疾患の治療におけるこれら化合物および組成物の使用に関するものでもある。
Patent JP-2007517330-A (JP)
Title: ３次元グラフィック・サブシステムにおけるテクスチャマップデータのプログラム可能なフィルタ処理方法及び装置
IPC: G06T15/00
Filed: 2004-12-23
Abstract: 適応性のあるテクスチャフィルタ処理を実現するシステム、方法及び装置が提供される。プログラム可能なテクスチャフィルタモジュールが、グラフィック・コプロセッサのグラフィック処理パイプラインに導入されるとともに、グラフィック・コプロセッサはホストと集積化される。そして、定義された命令セットからのプログラムが、テクスチャ処理コアにロードされ、そのプログラムに調和したテクスチャデータを処理する。
Patent JP-2007520941-A (JP)
IPC: H03K5/24
Filed: 2005-01-03
Abstract: The invention relates to a comparator with a constant duty cycle for high frequency data signals. Such comparators are often part of an integrated circuit and particularly useful in the mobile phone technology. To achieve the desired constant duty cycle for high frequency data signals, the comparator according to the invention comprises a differential amplifier (M1, M2) having differential inputs (IN 1, IN2) forming the comparator inputs and a first and second amplifier output (Vo, Vo-) forming the comparator outputs of a first comparator stage. Further, a first differential current amplifier (A11) is provided and connected with its inputs to the amplifier outputs (Vo, Vo-) and with its output to the first amplifier output (Vo). Finally, a second differential current amplifier (A12) is connected with its inputs to the amplifier outputs (Vo, Vo-) and with its output to the second amplifier output (Vo-).
Patent JP-2007520850-A (JP)
IPC: G11C16/10
Filed: 2005-01-20
Abstract: A low voltage of the order of or one to three volts instead of an intermediate V PASS  voltage (e.g. of the order of five to ten volts) is applied to word line zero immediately adjacent to the source or drain side select gate of a NAND flash device (100) to reduce or prevent the shifting of threshold voltage of the memory cells coupled to word line zero during the programming cycles of the different cells of the NAND strings. This may be implemented in any one of a variety of different self boosting schemes including erased areas self boosting and local self boosting schemes. In a modified erased area self boosting scheme, low voltages are applied to two or more word lines on the source side of the selected word line to reduce band-to-band tunnelling and to improve the isolation between two boosted channel regions. In a modified local self boosting scheme, zero volt or low voltages are applied to two or more word lines on the source side and to two or more word lines on the drain side of the selected word line to reduce band-to-band tunnelling and to improve the isolation of the channel areas coupled to the selected word line.
Patent JP-2008171216-A (JP)
Title: Operating system of computer system
Inventor: AKATA KAZUHIRO
IPC: G06K17/00
Filed: 2007-01-12
Abstract: <P>PROBLEM TO BE SOLVED: To enable use of a character user interface as an operating system of a computer system in security environment while reducing worker's labor and preventing erroneous input.  <P>SOLUTION: In this operating system, the worker of a computer system looks for a mark corresponding to a desired operation printed in an operational procedure manual 10 and reads it from a mark reader 30 connected to a terminal 20. A reader 30 analyzes the contents of the mark, and reads them as a character string instead of a keyboard on the terminal 20. The read character string is displayed on a screen connected to the terminal 20 and the computer system 40 is operated using it as an operation character string. The operation result is displayed on the screen connected to the terminal 20. The worker selects a character string to be input next from a mark being printed in the procedure manual 10 based on the operation result displayed on the terminal 20. Afterwards, the worker repeats the above until the end of all operations of the computer system.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008170767-A (JP)
Title: Electrophotographic photoreceptor, image forming method and apparatus using the same, and process cartridge for image forming apparatus
Inventor: FUJIWARA YUKIO
IPC: G03G5/05
Filed: 2007-01-12
Abstract: <P>PROBLEM TO BE SOLVED: To provide a high durability and high performance electrophotographic photoreceptor having excellent wear resistance, good electrical characteristics and excellent environmental responsiveness.  <P>SOLUTION: The electrophotographic photoreceptor has at least a photosensitive layer which is not radically cured and a crosslinked surface layer including a radically cured composition on an electroconductive substrate, wherein the radically cured composition of the crosslinked surface layer includes a structural unit represented by general formula (A), wherein Ar<SB>1</SB>-Ar<SB>3</SB>each represent an arylene group which may have a substituent; X represents an oxygen atom or a sulfur atom; and n represents 0 or 1.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008169182-A (JP)
Title: Hair cosmetic composition
Inventor: SASAO SUKETAKA
IPC: A61K8/41
Filed: 2007-01-15
Abstract: <P>PROBLEM TO BE SOLVED: To provide a hair cosmetic composition excellent in convenience and damaged hair-caring effect.  <P>SOLUTION: The hair cosmetic composition is used for the hair, preferably without rinsing, after applying to the hair and the composition comprises the following (A)-(D) components; (A) 0.07 mass% to 12.5 mass% surfactant, (B) 0.07 mass% to 12.5 mass% at least one silicone derivative selected from a dimethiconol and an amino-modified silicone, (C) 22.5 mass%-72.5 mass% polyol and (D) 0.07 mass% to 12.5 mass% water. It is preferred that the composition further comprises (E) 22.5 mass% to 72.5 mass% oily component which is a liquid at 25°C and that the (A) component is a cationic surfactant.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2007286038-A (JP)
Title: Stress detection sensor and its manufacturing method
Inventor: MIYAZAKI OSAO
IPC: G01L1/18
Filed: 2007-01-16
Abstract: <P>PROBLEM TO BE SOLVED: To provide a stress detection sensor capable of downsizing and improving detection precision of biaxial stress.  <P>SOLUTION: The stress detection sensor A1 includes a substrate 1 having at least a principal plane 1a formed of an insulator layer 1B and a pair of strip resistors 2A and 2B formed on the principal plane 1a wherein the pair of resistors 2A and 2B are orthogonal to each other and are structured to have their centers 2Aa and 2Ba overlapping each other. At least both end rims 2Ad and 2Bd of the pair of resistors 2A and 2B are in contact with the principal plane 1a, and an insulator layer 3a is interposed between their centers 2Aa and 2Ba. At least one of the pair of resistors 2A and 2B has a step 2Bc between the center 2Ba and both end rims 2Bd.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008178173-A (JP)
Title: Actuator, optical scanner, and image forming apparatus
Inventor: MURATA AKIHIRO
IPC: G02B26/10
Filed: 2007-01-16
Abstract: <P>PROBLEM TO BE SOLVED: To provide an actuator, which can efficiently perform the action detection of a movable board and the rotational drive, using a piezoelectric element while achieving downsizing, an optical scanner, and an image forming apparatus.  <P>SOLUTION: The actuator has a pair of piezoelectric elements 51 and 52 (a pair of piezoelectric elements 53 and 54), a voltage application means 6 which applies voltage to the pair of piezoelectric elements 51 and 52 alternately and cyclically, an action detection means 7 which detects the action of the movable plate, based on the electromotive force generated by the deformation in a state that the voltage of the piezoelectric elements 51 and 52 is not applied, and a controller 8 which controls the action of the voltage application means 6, based on the detection results of the action detection means 7.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008173836-A (JP)
Title: Composite panel
Inventor: SUZUKI SHINICHI
IPC: B32B5/26
Filed: 2007-01-17
Abstract: <P>PROBLEM TO BE SOLVED: To provide a composite panel causing no warpage in a woody fiber board even when it is asymmetrical and being excellent in bending strength.  <P>SOLUTION: The composite panel comprises laminating a bast fiberboard or a bamboo fiberboard with a specific gravity of 0.75 or above on at least one side of the woody fiberboard subjected to waterproof processing.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008177374-A (JP)
Title: Semiconductor device and its manufacturing method
Inventor: SATOYOSHI HIROTADA
IPC: H01L21/301
Filed: 2007-01-18
Abstract: <P>PROBLEM TO BE SOLVED: To provide a semiconductor device where an increase of manufacture cost or chipping of a semiconductor chip is suppressed, and also to provide a manufacturing method of the semiconductor device.  <P>SOLUTION: The semiconductor device and the manufacturing method of the device has processes of: dividing an off substrate 10 so that first faces S1 and S2 of the semiconductor device having an operation layer 18, which is installed on the off substrate 10, become first cleavage faces; and dividing the off substrate 10 so that second faces S3 and S4 crossing the first faces S1 and S2 of the semiconductor device become substantially vertical to a surface of the off substrate rather than a second cleavage face of the off substrate 10.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008178428-A (JP)
Title: Prize acquisition game machine
Inventor: KUSUNO HIROMI
IPC: A63F9/00
Filed: 2007-01-23
Abstract: <P>PROBLEM TO BE SOLVED: To provide a prize acquisition game machine which enables the setting of the degree of difficulty in securing the playing potentialities of a prize acquisition game machine both for skilled and non-skilled players.  <P>SOLUTION: The prize acquisition game machine is provided with a playing means and a target means within a playing space and the playing means is made movable at least in the first and second directions while workable in the third direction to let it approach the target means. Mode selectively operable is either the first mode which contains the first a and second a steps of moving the playing means by the operation of an operation means in the first and second directions and the third a step of moving the playing means in the third direction or the second mode which contains the first b step of moving the playing means in the third direction, the second b and third b steps of moving the playing means by the operation of the operation means in the first and second directions and the fourth b step of moving the playing means in the third direction.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008180115-A (JP)
Title: Device for managing fuel used in construction machine
Inventor: ISHII NOBUYUKI
IPC: F02D29/02
Filed: 2007-01-23
Abstract: <P>PROBLEM TO BE SOLVED: To easily grasp fuel to be used and suppress unauthorized fuel from being used with malice.  <P>SOLUTION: The device for managing fuel used in a construction machine mounted on the construction machine 20 is for managing usability of fuel used in an engine E of the construction machine 20. The device is provided with a fuel identification means 6 for identifying the kind of fuel introduced into a fuel tank of the construction machine 20, and a fuel determination part 5a for determining whether or not the fuel may be used from the identified kind of fuel identified by the fuel identification means 6 and outputting a control signal for managing an operation of the construction machine 20.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008180618-A (JP)
Title: Surface defect detector
Inventor: SAKUMA ATSUSHI
IPC: G01B11/06
Filed: 2007-01-25
Abstract: <P>PROBLEM TO BE SOLVED: To provide a surface defect detector which can calculate a feature value of a surface defect at high precision even if it is difficult to form a model of an inspection object.  <P>SOLUTION: The surface defect detector includes a light irradiating means for irradiating the inspection object with a light, a light receiving means for receiving light transmitted through or reflected from the inspection object, and a defect detecting means for detecting a surface defect of the inspection object based on the received light signal of the light receiving means. The defect detecting means processes the received light signal using correction information previously acquired based on the statistical processing, thereby calculating the feature value of the surface defect.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008182599-A (JP)
Title: Electronic equipment
Inventor: KATAYAMA YASUHIRO
IPC: H04M1/02
Filed: 2007-01-25
Abstract: <P>PROBLEM TO BE SOLVED: To provide a mobile phone 1 as electronic equipment in which an evaluation test can be conducted and which can ordinarily be used without increasing the number of components.  <P>SOLUTION: The mobile phone 1 has an operation part side casing 2 having a battery storage part 92 capable of storing a battery 90 and a cover lid as a cover member covering the battery storage part 92, and a circuit board 70 which is disposed in the operation part side casing 2 and mounted with an electronic component. Then the circuit board 70 has a plane part 73a which is disposed opposite to the battery lid 25 as the cover member across the battery 90 and constitutes the whole or part of the bottom surface of the battery storage part 92, and a mounting terminal to which a test connector 820 is mounted is formed at the plane part 73a.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008186135-A (JP)
Title: System for examining correctness of place-of-origin of raw material
Inventor: OSHIMA KAZUYASU
IPC: G06Q30/02
Filed: 2007-01-29
Abstract: <P>PROBLEM TO BE SOLVED: To enable a user to examine online whether a place-of-origin (place of production) of a raw material comprising various commodities is correct or needs special attention through the use of a server, a database of raw materials comprising various commodities, a terminal such as a personal computer or a cell-phone capable of reading two-dimensional code marks displayed on commodities, and a network circuit connecting them.  <P>SOLUTION: A system for examining correctness of a place-of-origin of a raw material is provided with a server A1 on a server site A, a database A2 connected to the server A1 and including a place-of-origin name master database 10 and a user-specific doubtful place-of-origin database, and a terminal B such as a personal computer or a cell-phone capable of reading two-dimensional code marks such as QR codes on a user side, and examines whether or not the place-of-origin of a commodity raw material is correct via a network line N such as the Internet.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008118609-A (JP)
Title: Imaging system and pixel defect correcting device
Inventor: SUMIYA AKINORI
IPC: H04N5/372
Filed: 2007-01-29
Abstract: <P>PROBLEM TO BE SOLVED: To prevent the excessive correction of subsequent defective pixels using an estimated value.  <P>SOLUTION: After performing static defective correction, a time measuring means measures an elapsed time, the subsequent defective pixels are measured after a predetermined time. The number of the defective pixels for the elapsed time is calculated using a statistical distribution. An allowable value is added to the number of the defective pixels calculated and a threshold is set. The threshold is compared with the number of the measured subsequent defective pixels, excessive correction is determined when the number of the defective pixels is large, the correction of the defective pixels is informed or correction is performed again.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2007177253-A (JP)
Title: Monoazo iron complex compound usable as charge control agent and the like
Inventor: OTSUKA HIDEYUKI
IPC: C09B45/14
Filed: 2007-01-30
Abstract: <P>PROBLEM TO BE SOLVED: To provide a compound useful for a charge control agent and a negatively chargeable toner, containing no noxious metal, having no risk of easy combustion and explosion and excellent in charge-imparting effect.  <P>SOLUTION: A monoazo iron complex compound such as one represented by formula [2] is provided. (Wherein, J is H, Na, NH<SB>4</SB>or an alkylammonium and may be two or more thereof; X<SB>1</SB>and X<SB>2</SB>are each independently H, an alkyl or a halogen atom; and Z<SB>1</SB>and Z<SB>2</SB>are each independently H, an alkyl or a halogen atom).  <P>COPYRIGHT: (C)2007,JPO&INPIT
Patent JP-2008191833-A (JP)
Title: Logical structure recognition processing program, logical structure recognition processing method and logical structure recognition processor
Inventor: TAKEBE HIROAKI
IPC: G06K9/20
Filed: 2007-02-02
Abstract: <P>PROBLEM TO BE SOLVED: To recognize a logical structure of a document having complicated layout with high accuracy.  <P>SOLUTION: By a recognition information acquisition means 3, a layout structure of the document layout inputted from the outside is recognized, and the layout structure and character information can be obtained. By an output means 4, accordance with each character string is decided by recursively verifying matching of a lower template configured by a node in node units included in a template in each the template stored in a template storage means 2 to each the character string of the obtained character information, the template having the matching with the character information is detected, it is decided whether positional relation between the nodes of the detected template satisfies the obtained layout structure or not, the template satisfying the positional relation is outputted as the template of the inputted document layout, and a matching result thereof is outputted as a logical structure recognition result to the document layout.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008190219-A (JP)
Title: Backflow preventing structure of boost water supply device
Inventor: SADOSHIMA SHIGERU
IPC: F04B23/04
Filed: 2007-02-05
Abstract: <P>PROBLEM TO BE SOLVED: To provide a backflow preventing structure of a boost water supply device improving the installation property of the boost water supply device.  <P>SOLUTION: The backflow preventing structure is provided with a backflow preventing device comprising a primary side check valve 21 for primary side backflow prevention with a larger pressure reducing effect than a check valve 6 on the discharge side of a booster pump part 3, on the suction side of a booster pump part 3 to doubly regulate backflow from the water supply side to the distributing main side by diverting the check valve 6 to secondary side backflow regulation, and a discharge mechanism 25 for discharging water from the secondary side of the primary side check valve when primary side pressure and secondary side pressure with the primary side check valve 21 held between are in an equal pressure state. With this constitution, since components of a pump unit 1 serve as both the exclusive secondary side check valve part and an intermediate chamber required in a conventional backflow preventing device, the backflow preventing device 20 can be miniaturized, and the degree of installation freedom of the boost water supply device can be improved.  <P>COPYRIGHT: (C)2008,JPO&INPIT