baber/WOPTO huggingface dataset:
Patent JP-2015535120-A (JP)
Title: 多次元ｒａｉｄ再構築および障害回避のための方法およびシステム
IPC: G06F3/06
Filed: 2013-10-28
Abstract: 一般に、本発明の実施形態は、データを書き込む要求を受け取ること、要求に応答して、データを書き込むようＲＡＩＤグリッドにおける第１のＲＡＩＤグリッド位置を選択すること、第１のＲＡＩＤグリッド位置に対応する持続性ストレージにおいて第１の物理アドレスを決定すること、データと、ＲＡＩＤグリッドについての第１のグリッドジオメトリおよびＲＡＩＤグリッド内のページについての第１のストライプメンバーシップを含む第１の帯域外（ＯＯＢ）とを含む第１のページを生成すること、ならびに、第１の物理アドレスに対応する持続性ストレージにおける第１の物理的位置に第１のページを書き込むことによってデータを格納することに関する。
Patent JP-2016502538-A (JP)
Title: Ｃｘｃｒ７アンタゴニスト
IPC: A61P25/00
Filed: 2013-11-26
Abstract: 本願発明は、下記式（Ｉ）：で表される化合物、又はその医薬的に許容できる塩、水和物又はＮ‐酸化物に関し、そしてそれらは、ＣＸＣＲ７への結合、及びＣＸＣＲ７活性に、少なくとも一部、依存する疾患の処置のために有用である。従って、本発明は、さらなる態様によれば、前記化合物及び医薬的に許容できる賦形剤を含む組成物に関する。
Patent JP-2015537391-A (JP)
Title: 補強ｐｖ積層体
IPC: H01L31/048
Filed: 2013-11-25
Abstract: 太陽モジュール（２）であって、（ａ）複数の相互接続した光電池（４）と、（ｂ）前方保護層（２２）と、（ｃ）後方保護層（２４）と、（ｄ）補強材（１０）と、を備え、補強材は太陽モジュール内に一体的に位置付けられ、前方保護層に実質的に近位の位置から、後方保護層に実質的に近位の位置に延在する、太陽モジュール。【選択図】図１
Patent JP-2016504233-A (JP)
Title: トレーラー連結車のブレーキを制御するための方法及び牽引車用のブレーキ制御装置
IPC: B60T8/176
Filed: 2013-11-14
Abstract: 本発明は、トレーラー連結車１のブレーキを制御するための方法に関する。このトレーラー連結車１が、電子制御ブレーキシステムを備える、少なくとも１つの前車軸ＶＡと１つの後車軸ＨＡとを有する牽引車２と、少なくとも１つの被牽引車軸ＡＡ１，ＡＡ２を有する被牽引車３とを備える。当該方法では、・ブレーキの操作時に、減速度目標値Ｚ−Ｓｏｌｌが算出され、実際の減速度実際値Ｚ−Ｉｓｔと比較され、実際の制動エネルギー基準値Ｋａｐｐａが、当該比較から算出され、・さらに、前記牽引車２と前記被牽引車３とに対する制動エネルギー目標値Ｐ−Ｓｏｌｌ＿Ｚ，Ｐ−Ｓｏｌｌ＿Ａが、実際の制動エネルギー基準値Ｋａｐｐａから算出され、前記牽引車２と前記被牽引車３とに対する制動エネルギーレベルＢＤＮ＿Ｚ，ＢＤＮ＿Ａが、前記制動エネルギー基準値Ｋａｐｐａ又は前記牽引車２の前記車軸荷重比ＡＬＶとに対する前記牽引車２と前記被牽引車３との制動エネルギーレベルＢＤＮ＿Ｚ，ＢＤＮ＿Ａの依存性を示す記憶された複数の特性曲線領域を使用して算出され、前記特性曲線領域が、少なくとも１つの予め設定可能な影響係数Ｅに応じて得られる。この場合、前記牽引車２及び／又は前記被牽引車３及び／又は前記トレーラー連結車１の荷重状態が算出されることが提唱されている。
Patent JP-2016513078-A (JP)
Title: 一段階または多段階のトリ型結核菌亜種副結核症サブユニット・ワクチン
IPC: A61K48/00
Filed: 2014-01-28
Abstract: 本発明により、マイコバクテリウム種（例えばトリ型結核菌亜種副結核症）によってヒトまたは動物で起こる潜在性感染または活動性感染に対する予防ワクチンまたは治療ワクチンで使用するための1つ以上の免疫原性ポリペプチドが提供される。さらに、マイコバクテリウム種（例えばトリ型結核菌亜種副結核症）感染の予防または治療のために投与することを目的として、前記1つ以上の免疫原性ポリペプチドを含む一段階または多段階のワクチンが提供される。それに加え、マイコバクテリウム種（例えばトリ型結核菌亜種副結核症）感染の予防または治療を目的として、前記1つ以上の免疫原性ポリペプチドを含んでいて、前記多段階ワクチンを生体内で発現させることのできる核酸ワクチンが提供される。
Patent JP-2016509697-A (JP)
Title: 多重チャンネルオーディオを圧縮するための再編成とレート割り当て
IPC: G10L19/008
Filed: 2014-01-23
Abstract: 多重チャンネルオーディオシグナルを複数の下位シグナルに再編成し、これらの下位シグナル間でビットレートを割り当てることで、これらの下位シグナルをオーディオコーデックの集合を用いて、割り当てられたビットレートで圧縮するときに、オリジナルの多重チャンネルオーディオシグナルへの忠実度が最適になるような方法とシステムを提供する。多重チャンネルオーディオシグナルの複数の下位シグナルへの再編成と、各下位シグナルへのビットレートの割り当ては、ある基準に従って最適化することができる。下位シグナルは、既存のオーディオコーデックを用いて、割り当てられたビットレートで量子化でき、そして、圧縮した下位シグナルは、オリジナルの多重チャンネルオーディオシグナルを再編成した方法に従って、オリジナルの形式に結合することができる。
Patent JP-2016507133-A (JP)
Title: 中性ビームを配向するための方法および装置
IPC: G21K1/14
Filed: 2014-02-04
Abstract: ガスクラスターイオンビームに由来する中性ビームの偏向を生じさせるための装置および方法は、ガスクラスターの解離およびイオンの除去を行う前に前記ガスクラスターイオンビームを偏向する。
Patent JP-2016509996-A (JP)
Title: イオン液体を製造する方法
IPC: C07D207/06
Filed: 2014-02-18
Abstract: 本発明は、揮発性溶剤及び／又は水を使用することなくイオン液体を製造する方法を提供する。幾つかの実施形態では、本発明の方法は、イオン液体を製造する連続プロセスを可能とする。【選択図】図1
Patent JP-2016511698-A (JP)
Title: 金属板素材の切断方法
IPC: B23K26/38
Filed: 2014-02-18
Abstract: 本発明は、移送方向（ｘ）に連続的に搬送される金属板ストリップ（１）から所定の輪郭（Ｋ）を有する金属板素材（２）を切断する方法であって、前記移送方向（ｘ）、及び該移送方向に対して垂直に延びるｙ方向の両方向に移動可能な少なくとも１つのレーザ切断ヘッド（Ｌ，Ｌ１，Ｌ２，Ｌ３）を有し、さらには前記所定の輪郭（Ｋ）に対応する切断経路に沿った前記レーザ切断ヘッド（Ｌ，Ｌ１，Ｌ２，Ｌ３）の移動を制御するための制御装置を有する少なくとも１つのレーザ切断デバイスを備えるステップと、ｙ方向の第１の固定測定ポイントからの前記金属板ストリップ（１）の第１のストリップ縁部の第１の距離（ＩＩ）を、前記レーザ切断デバイスの上流側に設けられた第１の距離測定装置（３）によって連続的に測定するステップと、第１の測定距離値を前記制御装置に送信するステップと、前記制御装置の制御プログラムによって、所定の切断経路と前記第１の測定距離値とを用いて補正切断経路を計算するステップと、前記補正切断経路に沿って前記レーザ切断ヘッド（Ｌ，Ｌ１，Ｌ２，Ｌ３）を移動することによって前記金属板ストリップ（１）内に切断線を生成するステップと、を含む方法に関する。
Patent JP-2016517196-A (JP)
Title: ワイヤレスデバイスにおけるクロックドリフトの影響を低減すること
IPC: H04L1/16
Filed: 2014-02-21
Abstract: それぞれのクロックドリフトを有する２つのワイヤレスデバイス間のラウンドトリップ時間（ＲＴＴ）を、ＲＴＴへのクロックドリフトの影響を低下させながら、計算するためのシステムおよび方法。第１のワイヤレスデバイスと第２のワイヤレスデバイスとの間で交換される１つまたは複数のメッセージの第１のセットに基づいて、第１のワイヤレスデバイスと第２のワイヤレスデバイスとの間で第１の方向における第１のＲＴＴが決定される。第２のワイヤレスデバイスと第１のワイヤレスデバイスとの間で交換される１つまたは複数のメッセージの第２のセットに基づいて、第２のワイヤレスデバイスと第１のワイヤレスデバイスとの間で第２の方向における第２のＲＴＴが決定され、第１のＲＴＴと第２のＲＴＴとの平均ＲＴＴが計算され、平均ＲＴＴはクロックドリフトの低い影響を有する。
Patent JP-2016513453-A (JP)
Title: 電子喫煙具に対する使用済カートリッジ検出方法およびシステム
IPC: A24F40/53
Filed: 2014-03-05
Abstract: 本開示は、ヒュージブルリンクの状態を識別する等して喫煙具のカートリッジ部分の状態を検出するよう適応される電子喫煙具のようなエアロゾル形成装置（１０）に関わる。喫煙具は、制御本体係合端部を有する制御本体部分（８０）であって、その中に制御部品（２０）及び電源（４０）を収容する制御本体部分を含み、更に、制御本体部分（８０）の制御本体係合端部を着脱可能に係合するよう構成されるカートリッジ本体係合端部を有するカートリッジ本体部分（９０）を含む。カートリッジ本体部分（９０）は、消耗部品配置、及び、少なくとも一つの加熱素子（５０）及びヒュージブルリンク（１６０）を含み、消耗部品配置と動作可能に係合される加熱接続部を有する。【選択図】図１
Patent JP-2017122777-A (JP)
Title: Image display device
Inventor: USUI TAKEMASA
IPC: G09G3/20
Filed: 2016-01-05
Abstract: PROBLEM TO BE SOLVED: To provide an image display device capable of suppressing deterioration of image quality even if a buffer area of a time aperture is reduced.SOLUTION: An image display device 1 includes: a display part 10; a video input part 11 to which a video signal is inputted; an extraction part 121 for taking out two frames with a time difference from the inputted video signal and for extracting movement of a subject recorded in the frames; a division part 122 for dividing a frame area into a moving area and a still area, based on the extraction result; and a control part 16 for displaying frames on the display part 10 by reducing emission time of the moving area shorter than that of the still area, providing a buffer area adjacent to both of the still area and the moving area, and gradually reducing emission time closer to the moving area in the buffer area. The control part 16 controls an emission period such that centers of gravity of emission time in the moving area, still area, and buffer area are consistent.SELECTED DRAWING: Figure 1
Patent JP-2016095867-A (JP)
Title: Computer system security dashboard
Inventor: DEREK PATTON PEARCY
IPC: G06F3/0481
Filed: 2016-01-07
Abstract: PROBLEM TO BE SOLVED: To provide a computing system security dashboard for presentation on a computer display device.SOLUTION: A dashboard 502a includes a plurality of security view panes 505a, 510a and 515a. Each security view pane, when expanded, presents a respective visualization of security conditions of a particular computing system. When the particular security view pane is collapsed, it can hide at least a portion of particular visualizations of security conditions presented using the particular security view pane when expanded. The particular pane occupies a smaller area of the computing system security dashboard when collapsed than when expanded. A particular visual indicator is presented on the particular security view, at least when collapsed, summarizing at least a portion of the particular security conditions identified in the particular visualizations.SELECTED DRAWING: Figure 5A
Patent JP-2017126140-A (JP)
Title: On-campus information service system
Inventor: TORII TSUNEO
IPC: G06Q50/20
Filed: 2016-01-13
Abstract: PROBLEM TO BE SOLVED: To provide an on-campus information service system capable of providing meaningful information by installing a digital signage within the campus.SOLUTION: A digital signage 1 is installed at a business place 4 in use such as a canteen and a cafeteria in a university and a professional school. When displaying information for users (students), the digital signage causes (a user) to register (to input) at least a matriculation number and an e-mail address as registration information D, and causes a server computer 61 to store the registration information in association with an ID of a smartphone 2. When detecting an approach of the smartphone 2 by beacon waves, an application is started up in the smartphone side 2 and, when the smartphone 2 is authenticated by NFC (Near Field Communication), the digital signage 1 permits a touch panel operation.EFFECT: This configuration narrows the users thereof only to the students and, different from a mere advertisement display, can properly provide each user with meaningful information.SELECTED DRAWING: Figure 1
Patent JP-2017130341-A (JP)
Title: Switch panel
Inventor: IWANAGA TAKASHI
IPC: H01H13/02
Filed: 2016-01-20
Abstract: PROBLEM TO BE SOLVED: To provide a switch panel capable of preventing a sheet that is extended and made to be thin by press or the like, from being damaged by deformation when pressing a switch by operating an operation button at an outer edge of an embossed part that is provided on the sheet.SOLUTION: A switch panel comprises: a key top which is pressed by a user to press a switch; an arm which supports the key top in a movable manner between an ordinary position and a press position; a support surface which supports the arm; and a sheet which is stuck over the support surface. On the sheet, an embossed part is formed by applying embossing processing in such a manner that a front face protruding to a front side of the key top is covered. On the support surface, a support part including a front face is formed at a position that is substantially parallel with the front face of the key top, along an inner peripheral surface of the embossed part.SELECTED DRAWING: Figure 1
Patent JP-2017130640-A (JP)
Title: Light-emitting device
Inventor: NAKA RYOJI
IPC: H01L23/29
Filed: 2016-01-22
Abstract: PROBLEM TO BE SOLVED: To provide a light-emitting device highly reliable which can suppress rising of light reflective resin.SOLUTION: The light-emitting device includes: a first lead having a lower surface and a recessed surface continuing the lower surface; a second lead arranged opposite the first lead; and a mold integrally formed with the first lead and the second lead. There are provided: a resin package having a recess where a part of the upper surface of the first lead and the second lead are included in a bottom surface; a light-emitting element mounted on the upper surface of the first lead on the bottom surface of the recess; a groove part which is separate from the side surface of the recess and surrounds the light-emitting element on the upper surface of the first lead on the bottom surface of the recess; and a light reflective member formed on the bottom surface between the side surface of the recess and the groove part. The recessed surface of the first lead is positioned at an end part on the first lead and the second lead side, and an outside upper end edge of the groove part is positioned nearer the end part side than a boundary part between the lower surface and the recessed surface in a cross-sectional view.SELECTED DRAWING: Figure 1C
Patent JP-2017132285-A (JP)
Title: Vehicle traveling control system and vehicle traveling control method
Inventor: AKAI AKIHITO
IPC: B60W50/14
Filed: 2016-01-25
Abstract: PROBLEM TO BE SOLVED: To call driver's attention by presenting a sensor detection area in which recognition accuracy drops due to an external environment in a selected fusion specification when one fusion specification corresponding to the external environment is selected.SOLUTION: The vehicle traveling control system has a processor and a memory, the vehicle having a plurality of sensors for detecting the external status of the vehicle, and is characterized in that the memory stores a plurality of fusion specifications corresponding to an external environment, the specifications being for fusing the detection results of a plurality of sensors, and the processor selects one fusion specification corresponding to the external environment of the vehicle, presents an area in which sensor recognition accuracy drops due to the external environment in the selected fusion specification as the weak area of the selected fusion specification to a driver, and fuses the detection results of the sensors on the basis of the selected fusion specification.SELECTED DRAWING: Figure 8
Patent JP-2017135853-A (JP)
Title: Rotary electric machine
Inventor: NAMBA MASAFUMI
IPC: H02K1/14
Filed: 2016-01-27
Abstract: PROBLEM TO BE SOLVED: To suppress torque decrease in a rotary electric machine that utilizes an axial surface as a torque surface.SOLUTION: The present invention relates to a rotary electric machine in which a stator and a rotor are disposed oppositely and an axial surface is used as a torque surface. A stator 120 comprises: an annular yoke part 210; multiple teeth 220 that are disposed in a circumferential direction of the annular yoke part 210 and protrude towards the axial surface of the rotor in a rotation axis direction; and a slot 230 which is disposed between the adjacent teeth and to which a stator coil 240 is mounted. An inner diameter side cross-sectional area and an outer diameter side cross-sectional area of an electrification surface of the slot 230 are made equal, an inner diameter side shape and an outer diameter side shape of the electrification surface of the slot 230 are made different, and an axial length at an outer diameter side is made shorter than that at an inner diameter side.SELECTED DRAWING: Figure 2A
Patent JP-2017134328-A (JP)
Title: Observation device and display device
Inventor: KASONO OSAMU
IPC: G02B21/36
Filed: 2016-01-29
Abstract: PROBLEM TO BE SOLVED: To allow a viewer to observe a microscope image and display image while minimizing fatigue of the viewer.SOLUTION: An observation device (1) includes a first optical system (112) for allowing a viewer to observe a microscope image as an image displayed in a first region (114) from a first eye point (EP1), and a second optical system (122) for allowing the viewer to observe a display image as an image displayed in a second region (124) from a second eye point (EP2). The first and second optical systems are arranged such that the first and second regions partially overlap in a gaze direction of the viewer, and that the microscope image and display image are not overlapped when observed by the viewer from the first eye point and from the second eye point.SELECTED DRAWING: Figure 2
Patent JP-2017132736-A (JP)
Title: Chromene compound, photochromic agent and photochromic optical material
Inventor: ABE JIRO
IPC: C07D491/052
Filed: 2016-01-29
Abstract: PROBLEM TO BE SOLVED: To provide a novel chromene compound, a photochromic agent and a photochromic optical material having color development speed and color discharge speed at high rate and of which color discharged body exhibit no yellowing.SOLUTION: There are provided chromene compounds having a pyranoquinazoline skeleton. The chromene compounds (pyranoquinazoline derivatives) are represented by the following general formula (1), where Ris an aryl group or a substituted aryl group and Ror Ris H or an electron donating group. These chromene compounds are added to a polymerization monomer together with other optical function additive and cured to be an optical product such as a lighting control lens.SELECTED DRAWING: None
Patent JP-2017138238-A (JP)
Title: Display method for road properties, and display apparatus for road properties
Inventor: SASAKI AKIRA
IPC: G08G1/00
Filed: 2016-02-04
Abstract: PROBLEM TO BE SOLVED: To enable multiple sets of information available from measured data to be displayed in an efficient and effective way.SOLUTION: Measured data on the quantities of separation from a measurement reference surface at individual points of a road surface measured along the measurement route of the road to be measured for a prescribed width, and road image data including roads acquired along the measurement route are acquired; a unit area which is to serve as a unit of processing is set on the basis of the measured data; a model surface in the unit area is set from the measured data in the unit area; point group data indicating the quantities of separation from individual points in the unit area from the model surface is generated; the separation quantity indicating data that indicates concentration difference or colors corresponding to the quantities of separation specified by the point group data is generated; and a road image based on road image data corresponding to a designated position on the road and a separation quantity image based on the separation quantity indicating data corresponding to the road image are displayed at the same time.SELECTED DRAWING: Figure 7
Patent JP-2017138265-A (JP)
Title: Holding device, and checking kit
Inventor: IWASA KAYO
IPC: G01N33/543
Filed: 2016-02-05
Abstract: PROBLEM TO BE SOLVED: To provide a holding device that users can use for setting multiple test pieces of their own choice, and a checking kit equipped with such a holding device.SOLUTION: A holding device is equipped with: a first base part; a second base part; a bendable part; and a stationary part having a first part disposed in the first base part and a second part disposed in the second base part in which when the bendable part is bent, the first part and the second part are fixed in contact with each other. When the first part and the second part are fixed with each other by bending the bendable part, the relative positions of the first base part and the second base part become fixed. By placing each of multiple test pieces between the first base part and the second base part in that state, the holding device is enabled to hold the multiple test pieces in a state in which one end side of each of the multiple test pieces extends to outside the holding device.SELECTED DRAWING: Figure 1
Patent JP-2017143094-A (JP)
Title: Heat sink, thermoelectric conversion module, method of manufacturing heat sink
Inventor: KONDO YOSHIHIRO
IPC: H01L35/30
Filed: 2016-02-08
Abstract: PROBLEM TO BE SOLVED: To provide a heat sink of high productivity and high heat dissipation, and a thermoelectric conversion module using the same.SOLUTION: A heat sink 40A has a structure where a base 10 and a heat dissipation fin 23, each composed of a porous metal, are integrated. In the heat sink 40A, a porous metal having a relatively low porosity is used for composing the base 10. Meanwhile, a porous metal having a relatively high porosity is used for composing the heat dissipation fin 23, so that a fluid 30 such as air or water can be fed inside, as a refrigerant. More specifically, porosity of the porous metal in the heat dissipation fin 23 is higher than that of the porous metal in the base 10.SELECTED DRAWING: Figure 2
Patent JP-2016131029-A (JP)
Title: Information processing system, information processing apparatus, information processing program, information processing method, and storage medium
Inventor: SHIMOHATA YASUYUKI
IPC: G06F21/62
Filed: 2016-02-12
Abstract: PROBLEM TO BE SOLVED: To provide a storage medium that can be used for general purposes.SOLUTION: An information processing system includes a storage medium and an information processing apparatus that performs short-distance wireless communication with the storage medium. The storage medium has an appearance representing, in two or three dimensions, an object which appears in a virtual space generated through execution of a predetermined application program by the information processing apparatus. The storage medium also stores object information regarding the object. The information processing apparatus writes character image information which identifies an image of a character generated on the basis of an instruction from a user, into the storage medium. The information processing apparatus executes predetermined processing by using at least one of the object information and the character image information read from the storage medium.SELECTED DRAWING: Figure 6
Patent JP-2017149999-A (JP)
Title: Heat treatment facility
Inventor: OSHITA OSAMU
IPC: C21D1/773
Filed: 2016-02-22
Abstract: PROBLEM TO BE SOLVED: To enable an operation of delivering a workpiece between a transportation unit and a treatment chamber to be appropriately performed by reducing the pressure of a linking portion through which the transportation unit and the treatment chamber are linked in a sealed state.SOLUTION: In a heat treatment facility, a transportation unit 30 that transports a workpiece is guided to a position facing a treatment chamber H in which a workpiece W is heat-treated, and the workpiece W is delivered between the transportation unit 30 and the treatment chamber H in a state in which the transportation unit 30 and the treatment chamber H are linked in a sealed state by a stretchable linking member 34. In the heat treatment facility, maintenance means 40 is disposed which maintains the transportation unit 30 and the treatment chamber H to have a constant distance from each other by exerting a force on a portion between the transportation unit 30 and the treatment chamber H in the case of reducing the pressure of the interior of the linking portion through which the transportation unit 30 and the treatment chamber H are linked by the linking member 34.SELECTED DRAWING: Figure 7
Patent JP-2016094486-A (JP)
Title: Multivalent antibodies
Inventor: DAVID PAUL HUMPHREYS
IPC: C07K16/46
Filed: 2016-02-22
Abstract: PROBLEM TO BE SOLVED: To provide antibodies such that affinity to one or more target antigens is not detrimentally affected by a format.SOLUTION: A multivalent antibody fusion protein comprises: a heavy chain comprising, in sequence from the N-terminal, a variable domain nominally V1, a C1 region and a further variable domain nominally V2, a light chain comprising, in sequence from the N-terminal, a variable domain nominally V1, a CL domain and a variable domain nominally V2, where the heavy and light chains are aligned to provide a first binding site formed by a first variable domain pair of V1 and V1 and a second binding site formed by a second variable domain pair of V2 and V2, where there is a disulfide bond between a variable domain pair forming a binding site, and the fusion protein is conjugated to a PEG polymer.SELECTED DRAWING: Figure 1
Patent JP-2017152546-A (JP)
Title: Imaging device and semiconductor device
Inventor: OKOCHI NAOKI
IPC: H01L27/14
Filed: 2016-02-25
Abstract: PROBLEM TO BE SOLVED: To provide an imaging device in which a plurality of semiconductor substrates are housed in a housing body.SOLUTION: An imaging device 1 comprises: a first semiconductor substrate 2 that has an imaging region 2a; two second semiconductor substrates 3 bonded with the first semiconductor substrate 2; and a housing body 4 that houses the first semiconductor substrate 2 and the second semiconductor substrates 3.SELECTED DRAWING: Figure 2
Patent JP-2017150402-A (JP)
Title: Ceiling fan
Inventor: YASUKITA MICHITO
IPC: F04D29/70
Filed: 2016-02-25
Abstract: PROBLEM TO BE SOLVED: To provide a ceiling fan for reducing accumulation of dust on its blade.SOLUTION: This invention provides a ceiling fan comprising: a shaft 2; a motor 3 connected to the shaft 2 and having a rotating part; a blade 4 having an air blowing surface 5 connected to the rotating part to feed air in a vertical direction at the time of its rotation; and an air blowing surface angle changing part 8 for opposing the air blowing surface against a peripheral direction of the rotating part at the time of stopping of rotation of the rotating part. The air blowing surface angle changing part 8 rotates the air blowing surface 5 of the blade 4 by an elastic body 14 connected to an inner peripheral side of the blade 4 in its longitudinal direction to energize the blade 4 toward a central shaft at the rotating part and by a twisting part 12 for changing the air blowing surface 5 of the blade 4 from the peripheral direction of the central shaft to a vertical direction against an elongation of the elastic body 14 toward its outer peripheral side by a centrifugal force at the time of rotation.SELECTED DRAWING: Figure 2