baber/WOPTO huggingface dataset:
Patent JP-2021521648-A (JP)
Title: 加熱されるセラミック面板
IPC: C23C16/455
Filed: 2019-03-19
Abstract: 処理チャンバ内のガスを分配するための装置が開示される。装置は、本体を含み、本体は、結合部により囲まれた分配部から形成される。ヒータが、本体を高温に加熱するために、分配部の内部に配置されている。ブリッジが、結合部と分配部との間に延在している。ブリッジは、分配部と結合部との間の熱伝導を制限する。【選択図】図１
Patent JP-2021508166-A (JP)
Title: 照明ユニットを有する窓
IPC: F21S4/20
Filed: 2019-02-14
Abstract: 窓が、窓を開ける際に使用するためのバーハンドルに沿って設けられた照明ユニットを有する。照明ユニットは、例えば屋外が暗いとき、窓板を照明するためのものである。これは、屋根窓（例えば天窓）にとって特に興味深い。照明は、窓板の暗い外観を防ぐ。
Patent JP-2021522131-A (JP)
Title: リレーモジュールを含む自動格納及び回収システム並びにそのようなシステムを動作させる方法
IPC: B65G1/00
Filed: 2019-04-24
Abstract: 本発明は、自動格納及び回収システムであって、ポートカラム（６１）とアクセスステーション（６４）との間で格納容器（６）を中継するための少なくとも１つのリレーモジュール（６０）を備え、リレーモジュール（６０）は、ポートカラム（６１）の下に配置され、リレーモジュール（６０）は、ポートカラム（６１）から投下される格納容器（６）及びポートカラム（６１）を介して収集されるべき格納容器（６）を受容するためのポートステーションと、ポートステーションのサイドに各々が配置される第１のコンベヤ及び第２のコンベヤであって、第１のコンベヤは、格納容器（６）をアクセスステーション（６４）に搬送するように適合され、第２のコンベヤは、格納容器（６）をアクセスステーション（６４）から搬送するように適合される、第１のコンベヤ及び第２のコンベヤと、を含む、自動格納及び回収システムに関する。 【選択図】図９ａ
Patent JP-2021523635-A (JP)
Title: 無線接続を安全にする方法、装置、およびシステム
IPC: H04W36/14
Filed: 2019-05-10
Abstract: 無線接続を安全にする方法は、ユーザ機器（ＵＥ）との接続セットアップを実施することと、セキュリティ情報の必要性をトリガするイベントに基づいて、ＵＥのためにセキュリティ情報が必要であると判定することと、ＵＥのためのセキュリティ情報を要求する指示を第２のネットワークノードに伝送することと、ＵＥコンテキストセットアップ手順を介して、セキュリティ情報をネットワークノードから受信することと、を含む。方法は、無線アクセスネットワークのネットワークノード、またはコアネットワークの管理および機能ノードのどちらかによって、ＵＥがセキュリティ手順をセットアップすることが要求されるか否かを判定することによって、ネットワークにおけるリソースの無駄を回避してもよい。 【選択図】図１２
Patent JP-2021535763-A (JP)
Title: 紫外線ラインビーム殺菌器
IPC: A61L2/10
Filed: 2020-08-13
Abstract: 本発明は、搬送部により搬送されている搬送物に紫外線ラインビームを照射して殺菌処理する技術に関し、上部光源モジュールおよび下部光源モジュールを有し、コンベアにより搬送される個人所持品の上部面および下部面に紫外線ラインビームを照射する紫外線光源部と、上部光源モジュールおよび下部光源モジュールから出射される紫外線ラインビームを反射させて個人所持品の左右側面に照射する左右側反射板、および紫外線ラインビームを反射させて個人所持品の前後面に照射する楔型反射板を有する反射板部と、コンベア上に間隔をおいて一列に設けられた複数のセンサを有し、個人所持品の搬送位置の検知信号を出力するセンサ部と、検知信号とユーザの設定情報に応じて、パルス幅変調信号およびスイッチング制御信号を出力する制御部とを備えることを特徴とする。【選択図】図１
Patent JP-2021523650-A (JP)
Title: 安全なブロックチェーントランザクションおよびサブネットワークのためのシステム、方法、デバイス及び端末
IPC: H04L9/08
Filed: 2019-03-27
Abstract: 【課題】本明細書はデジタルアセットの安全なブロックチェーントランザクションを実行するためのシステム、デバイス、方法及びサブネットワークを提供する。 【解決手段】システムは、ブロックチェーントランザクションを生成し第１及び第２のモードで動作するように構成された端末と、端末が第１及び第２のモードで同時に動作するのを妨げるためのスイッチコネクタを含む。端末が第１のモードにあるとき端末はネットワークを介してシステムプロバイダサーバに接続され、システムプロバイダサーバは複数のブロックチェーンデバイスと通信する。端末が第２のモードにあるとき端末はコールドストレージデバイスと通信する。コールドストレージデバイスはブロックチェーントランザクションに署名するための秘密鍵を格納するように構成される。端末は秘密鍵を使用してコールドストレージデバイスのブロックチェーントランザクションに署名するように構成される。 【選択図】図５
Patent JP-2021524607-A (JP)
Title: 液体レンズおよびこれを含むレンズアセンブリ
IPC: G02B7/02
Filed: 2019-05-23
Abstract: 実施例による液体レンズ部は、伝導性の第１液体および非伝導性の第２液体を収容するキャビティ（cavity）を有する第１プレートと、第１プレート上に配置される第１電極と、第１プレートの下に配置される第２電極と、第１電極上に配置される第２プレートと、第２電極の下に配置される第３プレートと、第１プレートと第３プレートとの間に配置される弾性部材と、を有する。【選択図】 図５ａ
Patent JP-2021516454-A (JP)
Title: フィールドプレート設計を最適化した電力用半導体デバイス
IPC: H01L21/28
Filed: 2019-02-27
Abstract: 【構成】本発明は電力用半導体デバイスおよびその製造方法を提供するものである。このデバイスはソースボンディングパッドおよびドレインボンディングパッドを有し、かつこのドレインボンディングパッドに接続されたドレインフィールドプレートを有するドレインメタライゼーション構造およびソースボンディングパッドに接続されたソースフィールドプレートを有するソースメタライゼーション構造を有する。これらボンディングパッドの少なくとも一つの少なくとも一部がアクティブ領域の直ぐ上に位置する。フィールドプレートの少なくとも一つのディメンションが、フィールドプレートに隣接する構造に応じて変化する。【選択図】図７
Patent JP-2021528331-A (JP)
Title: 作業ステーションの取り込みポイントへの保管グリッドロボットの調整されたナビゲーションによって内部仕分けを実行する保管および取り出しシステム
IPC: B65G1/04
Filed: 2019-06-10
Abstract: 保管構造を提供する同じロボット車両群によって提供される作業ステーション、他のコンベヤまたはハンドラへの引き渡しなしに作業ステーションを介して保管ユニットを運搬するために同じロボット車両を用いる巡回作業ステーションの取り込みポイントへのロボット車両の調整ナビゲーションを使用する内部仕分け、センサ上の保管ユニットの適切な積み込みおよび位置合わせを確認するためのロボット車両上のセンサ、ロボット車両をその下部軌道からグリッドのシャフト内に上昇させるためのリフト機構、ロボット車両をグリッドのシャフトに位置合わせするためのマーカおよびスキャナの使用、ならびに手の安全、ピックカウントおよびコンテナ内容物のはみだし検出のための作業ステーションライトカーテン、を特徴とする、グリッド状三次元保管構造を用いる改良された保管および取り出しシステム。
Patent JP-2022513546-A (JP)
Title: 単一表面プライマーを使用したペアエンドシーケンシングのための方法および組成物
IPC: C12Q1/6874
Filed: 2019-12-09
Abstract: 本開示は、標的核酸のペアエンドシーケンシングのための組成物および方法に関し、より具体的には、１種類の表面プライマーを有する増幅部位を使用して標的核酸の２つの別個の領域からヌクレオチド配列情報を取得することに関する。
Patent JP-2021062236-A (JP)
Title: Thrombectomy apparatus
Inventor: JENSON MARK L
IPC: A61B17/22
Filed: 2021-01-08
Abstract: To provide an apparatus for removing thrombi and other unwanted materials from within vessels such as arteries and veins.SOLUTION: An over-the-wire type thrombectomy apparatus 112 includes an elongate shaft 114 having an interior tube and an exterior tube. The exterior tube has an evacuation lumen 118 which is configured to dispose a guidewire 98 and evacuate thrombi. The evacuation lumen 118 has a proximal end configured to be coupled to a vacuum source and a distal end including an opening perpendicular to a longitudinal axis of the elongate shaft 114. The interior tube includes a high pressure lumen 108 having a proximal end configured to be coupled to a supply source of pressurized fluid and a closed distal end positioned near the opening and inside the evacuation lumen 118. The high pressure lumen 108 includes a jet orifice 110 that is disposed in a side surface of the high pressure lumen 108 proximate a closed distal end thereof. The jet orifice 110 is configured to provide a fluid jet that traverses the evacuation lumen 118.SELECTED DRAWING: Figure 9
Patent JP-2021062631-A (JP)
Title: Laminated polyester film
Inventor: TAKAGI NORIYUKI
IPC: B05D7/04
Filed: 2021-01-13
Abstract: To provide a laminated polyester film which has high transparency, has blocking resistance, and is excellent in adhesion to a hard coat layer and adhesion to UV ink.SOLUTION: A laminated polyester film has a coating layer on at least one surface of a polyester film base material. The coating layer is obtained by curing a composition containing an urethane resin having a polycarbonate structure, a crosslinking agent and a polyester resin, a maximum value of a distribution curve of a nitrogen element based on element distribution measurement in a depth direction of the coating layer is present in the vicinity of the surface of the coating layer on a side opposite to the polyester film base material, and an appropriate amount of a polycarbonate structure is present on the surface of the coating layer on the side opposite to the polyester film base material.SELECTED DRAWING: Figure 2
Patent JP-2021082372-A (JP)
Title: Non-volatile storage device and program method of non-volatile storage device
Inventor: YASUDA MAKOTO
IPC: H01L21/336
Filed: 2021-01-19
Abstract: To reduce a circuit area of a non-volatile storage device.SOLUTION: A non-volatile storage device 10 comprises memory transistors 11, 12. The memory transistor 11 is turned on based on a first voltage supplied to a gate, and outputs an output voltage which is based on a power source voltage VSS supplied to one of the source and the drain from the other source and the drains. The memory transistor 12 is a conductive type same as that of the memory transistor 11, and one of the source and drain is connected to the other of the source and the drain of the memory transistor 11. The memory transistor 12 is programmed to be turned off when a power source voltage VDD is supplied to the other of the source and the drain and the first voltage is supplied to the gate.SELECTED DRAWING: Figure 1
Patent JP-2022112814-A (JP)
Title: Electronic apparatus
Inventor: TOKUYAMA YOSUI
IPC: H05K5/06
Filed: 2021-01-22
Abstract: To provide an electronic apparatus capable of improving waterproof performance.SOLUTION: An electronic apparatus 10 includes a housing 12 having a first housing 18 and a second housing 20 combined with each other, and a cable 16 extending inside and outside the housing 12 through a through hole 26 formed at the boundary between the first housing 18 and the second housing 20. A first groove 32 extending annularly along the circumferential direction of the through hole 26 is formed on the inner peripheral surface of the through hole 26, and a first protrusion 46 extending annularly along the circumferential direction of the cable 16 and inserted into the first groove 32 is formed on the outer peripheral surface of the cable 16. The tip of the first protrusion 46, the first side surface, and the second side surface have a gap 54 between the bottom surface, the first side surface, and the second side surface of the first groove 32, and the gap 54 is filled with a sealing material 56.SELECTED DRAWING: Figure 4
Patent JP-2022112928-A (JP)
Title: Feeding device
Inventor: ARIMATSU TATSUYA
IPC: G01G19/52
Filed: 2021-01-22
Abstract: To provide a feeding device at low cost that allows for estimating the total amount of a plurality of cardboard sheets in a stacked state.SOLUTION: A feeding device 10 feeds a cardboard sheet Z to a feed position SP, for a carton-forming device 12 that opens and carton-forms a folded cardboard sheet Z. The feeding device 10 comprises a conveyance unit 50, a drive unit 60 and a control unit 40. The conveyance unit 50, in a state a plurality of cardboard sheets Z are stacked, carries the cardboard sheets Z to the feed position SP. The drive unit 60 drives the conveyance unit 50. A controller 40, as a control unit, estimates the total amount of the plurality of cardboard sheets Z in a stacked state on a transport surface 53a of the conveyance unit 50. The controller 40, when the drive unit 60 is driving the conveyance unit 50, acquires a value related to a drive force of the drive unit 60 and estimates the total amount of the plurality of cardboard sheets Z in a stacked state based on the acquired value.SELECTED DRAWING: Figure 5
Patent JP-2022113966-A (JP)
Title: Pigment composition and use thereof
Inventor: TAKAHATA NORIYOSHI
IPC: C09D11/02
Filed: 2021-01-26
Abstract: To provide a pigment composition excellent in clarity, dispersibility and crystal stability.SOLUTION: A pigment composition contains composite pigment particles containing C.I. Pigment Red 269 and C.I. Pigment Red 150. In the composite pigment particles 100 mol%, a content of C.I. Pigment Red 150 is 10-50 mol%. Preferably, a powder X-ray diffraction of the composite pigment particles using CuKα rays has no maximum peak in a range of: a diffraction angle (2θ)=13.5-14.5°.SELECTED DRAWING: Figure 1
Patent JP-2022007953-A (JP)
Title: Detergent composition for intraorally wearable implements
Inventor: HANDA TAKUYA
IPC: A61K8/34
Filed: 2021-01-26
Abstract: To provide detergent compositions for intraorally wearable implements with high detergent performance, which can exert an excellent denture plaque removal effect.SOLUTION: Provided is a detergent composition for intraorally wearable implements, which contains following components (A) and (B): (A) 0.05 mass% or more to 8 mass% or less of an anionic homopolymer or copolymer with a mass average molecular weight of 2,000 or more and 500,000 or less, containing a structural unit derived from an anionic monomer (a1) having a carboxyl group, a sulfo group, or a phosphoric acid group; and (B) one or more surfactants selected from anionic surfactants, nonionic surfactants, and amphoteric surfactants, the mass ratio ((A)/(B)) of the content of the component (A) to the content of the component (B) being 0.05 or more and 50 or less, and the content of an alcohol (C) having 2 or more and 6 or less carbon atoms being less than 8 mass%.SELECTED DRAWING: None
Patent JP-2022115470-A (JP)
Title: game machine
Inventor: TSUCHIYA YOSHITAKA
IPC: A63F7/02
Filed: 2021-01-28
Abstract: To increase game amusement.SOLUTION: A first display performance is a display performance for displaying a first game state suggestion image indicating that a game state is a first game state that is relatively advantageous to a player. A second display performance is a display performance for executing a first game mode display indicating the first game mode, which is one game mode among multiple game modes executed in the first game state. A third display performance is a display performance for executing a mode change display for changing from the first game mode to the second game mode, which is one game mode among the plurality of game modes, on the basis of the satisfaction of a predetermined condition. A combination performance including the first display performance, the second display performance, and the third display performance may be executed. In the combination performance, after the first display performance and the second display performance are executed, the third display performance is executed. While the first display performance is executed, a predetermined character is displayed.SELECTED DRAWING: Figure 108
Patent JP-2021073356-A (JP)
Title: Manufacturing method of terminal vinyl group-containing propylene polymer
Inventor: ITO MASAAKI
IPC: C08F10/06
Filed: 2021-02-03
Abstract: To provide a method for manufacturing a terminal vinyl group-containing propylene polymer that is low in molecular weight, high in a terminal vinyl rate and good in particle properties.SOLUTION: A terminal vinyl group-containing propylene polymer has number average molecular weight of 5,000 or more and 30,000 or less when measured by GPC, a terminal vinyl rate of 0.7 or more and bulk density of 0.30 g/ml or more and less than 0.40 g/ml. An amount of coarse powder of the terminal vinyl group-containing propylene polymer is 1 mass% or less, and a melting point (Tm) of the same is lower than 153°C. The terminal vinyl group-containing propylene polymer serves as a raw material for macromers, coatings, primers, surface modifiers or coating materials.SELECTED DRAWING: None
Patent JP-2022122655-A (JP)
Title: Authentication system, mobile device, processing device, and computer program
Inventor: NAWA YUKI
IPC: B60R25/04
Filed: 2021-02-10
Abstract: To enhance convenience of an authentication system.SOLUTION: A mobile device 11 is portable by a person. An acceleration sensor 113 is mounted on the mobile device 11, and outputs an acceleration signal AC corresponding to acceleration applied to the mobile device 11. A control device 12 controls operation of a controlled device 31 on the basis of authentication processing of authenticating the mobile device 11. A processing device 13 executes determination processing of determining whether or not the person walks on the basis of the acceleration signal AC, and outputs a determination result to the control device 12. When it is determined that the person walks by the determination processing, the processing device 13 disables the execution of the authentication processing.SELECTED DRAWING: Figure 2
Patent JP-2021073413-A (JP)
Title: engine
Inventor: KITAGAWA TOMOAKI
IPC: F02F7/00
Filed: 2021-02-12
Abstract: To provide an engine having a configuration contributing to space saving of an EGR flow passage.SOLUTION: An engine 1 includes: a plurality of exhaust ports 41 for discharging exhaust gas from a combustion chamber; and second EGR piping 21b serving as an EGR flow passage through which EGR gas passes. Exhaust outlets 41b of the plurality of exhaust ports 41 and an EGR gas inlet 44a of the second EGR piping 21b are disposed on a left side surface 4a of a cylinder head 4. The second EGR piping 21b is connected to an exhaust manifold 6 mounted to the left side surface 4a via an EGR cooler 20.SELECTED DRAWING: Figure 3A
Patent JP-2021073632-A (JP)
Title: Article providing apparatus
Inventor: MURAKAMI GENYO
IPC: G07F9/00
Filed: 2021-02-17
Abstract: To provide an article providing apparatus that presents a storage status of an article to a consumer so that predetermined articles can be provided without problems.SOLUTION: The article providing apparatus includes a providing unit 10 and a guide unit 20. The providing unit 10 includes an article storage unit 12 for storing an article AR and an article providing unit 13 for providing the article stored in the article storage unit 12. The guide unit 20 includes a storage status managing unit 25 for managing a storage status of the article AR stored in the article storage unit 12 and an information presentation unit 22 for presenting article storage information on the basis of a management signal from the storage status managing unit 25.SELECTED DRAWING: Figure 4
Patent JP-2022127084-A (JP)
Title: Work machine
Inventor: NAGAI MASAKI
IPC: E02F9/22
Filed: 2021-02-19
Abstract: To provide a work machine which can prevent operation performance degradation when a dynamic characteristic of the work machine in a specific operation is sequentially updated using online learning.SOLUTION: A hydraulic shovel 1 includes: a controller 5 which includes a dynamic characteristic updating unit 51, a productivity obtaining unit 53, and a fuel consumption mode detecting unit 54; and a storage unit 6. The dynamic characteristic updating unit 51 computes an optimal dynamic characteristic of an operation object, and updates the dynamic characteristic of the operation object to the optimal dynamic characteristic. The productivity obtaining unit 53 obtains productivity in the case of performing a specific operation on the operation object. The fuel consumption mode detecting unit 54 detects a change in a fuel consumption mode. When a change in the fuel consumption mode is detected while a process of updating to the optimal dynamic characteristic is being performed, the dynamic characteristic updating unit 51 sets an initial dynamic characteristic associated with a fuel consumption mode after the change, as the dynamic characteristic, and keeps setting the initial dynamic characteristic as the dynamic characteristic until a predetermined number of times of the specific operation are performed, when the initial dynamic characteristic is equal to or below a threshold value.SELECTED DRAWING: Figure 2
Patent JP-2022131396-A (JP)
Title: Charging time management system and program
Inventor: IZUMI YOJIRO
IPC: G16Y20/30
Filed: 2021-02-26
Abstract: To more correctly recognize the charging even when a peculiar state such as charge recording omission occurs.SOLUTION: A charging time management system includes: acquisition means for acquiring information on charging of a vehicle which travels using a rechargeable battery, the information on a charging place, and the information on the time at which the information on the charging is obtained; and charging time specifying means which specifies the charging time of the vehicle performed at a predetermined charging place by the information on the charging, the information on the charging place and the information on the time.SELECTED DRAWING: Figure 3
Patent JP-2022131466-A (JP)
Title: Information processing apparatus and information processing program
Inventor: JON MICHAEL DERECHO
IPC: H04N1/00
Filed: 2021-02-26
Abstract: To provide an information processing apparatus and an information processing program for allowing a user to easily perform processing of editing a desired part of an image indicated by an electronic file even when the image indicated by the electronic file is a large amount and newly creating an electronic file corresponding to the part without time and effort.SOLUTION: In a document file changing processing, upon receiving division instructions to designate any one of a plurality of types of predetermined division positions, a control unit of an image forming apparatus divides an image to create groups in accordance with the type of the designated division position, upon receiving editing instructions to designate a group number and the details of editing of a document file, performs editing according to the designated details of editing on a group corresponding to the designated group number, and upon receiving creation instructions for creating a new document file, newly creates a document file indicating the created groups.SELECTED DRAWING: Figure 3A
Patent JP-2022131496-A (JP)
Title: Gas bearing device and turbocharger
Inventor: FUTAE TAKAYA
IPC: F16C27/02
Filed: 2021-02-26
Abstract: To provide a gas bearing device which reliably forms a gas film between a shaft and a top foil when rotated at a high rotation speed and can reliably support the shaft when started up.SOLUTION: A gas bearing device which rotatably supports a rotation shaft with gas as work fluid comprises: a housing with the rotation shaft penetrating therethrough; an annular top foil which is stored in the housing and encloses an outer periphery of the rotation shaft; a back spring which is installed between the top foil and the housing and has a plurality of threads brought into contact with the top foil and a plurality of roots brough into contact with the housing; and a pair of snap rings which is inserted into a shaft hole, on the housing, where the rotation shaft penetrates and regulates displacement of the back spring in a shaft direction of the rotation shaft. Each inner peripheral surface of the pair of snap rings has a self-lubricating property.SELECTED DRAWING: Figure 5-2
Patent JP-2022132911-A (JP)
Title: Thermophysical property measuring apparatus and thermal conductivity measuring method
Inventor: HAMAMOTO SHIGEKI
IPC: G01N25/18
Filed: 2021-03-01
Abstract: To provide an easy-to-use thermal conductivity measuring method that can be applied to a borehole in a shallow-layer having no general heat exchange well or borehole water and a thermophysical property measuring apparatus that can be used in this measuring method.SOLUTION: There are provided: a thermophysical property measuring apparatus for measuring a thermophysical property of soil at an original position in a borehole; and a thermal conductivity measuring method using the same. The thermophysical property measuring apparatus includes: a packer having a stretchable part; means for pouring fluid into and out from the stretchable part; a cylindrical heat source wound around the stretchable part; a temperature sensor arranged on an outer peripheral side of the cylindrical heat source; a power supply supplying electrical power to the cylindrical heat source; and means for recording temperature measured by the temperature sensor. Therein, the cylindrical heat source is made of a sheet-like heater element, or made of an elastic member and the sheet-like heater element; the packer is movable in the borehole together with the cylindrical heat source and the temperature sensor when the stretchable part is shrunk; and the stretchable part appresses the sheet-like heater element and the temperature sensor to a wall of a bore when expanded.SELECTED DRAWING: Figure 1
Patent JP-2022133572-A (JP)
Title: Lighting fixture
Inventor: KAWAKAMI RYOTA
IPC: F21V23/00
Filed: 2021-03-02
Abstract: To attain prevention of coming-off when wires are pulled, instead of the prior measures to prevent the wires from coming off when the wires are pulled from outside a lighting fixture, the prior measures requiring a cable tie or a tension-stopping part in order to bundle the wires in a loop manner with the cable tie or attaching the wires to the special tension-stopping part.SOLUTION: As one means, an electric circuit unit having a power supply circuit to which external power is supplied by wires is arranged in an internal space of a body; a wire arrangement passage in which at least three wire abutting parts are arranged at intervals and the middle part of the wire abuts on the wire abutting part and bends into a mountain shape, is formed by the body and the electric circuit unit; and when the wires are pulled outward, the wires come into pressure contact with the wire abutting parts to restrain the movement of the wires.SELECTED DRAWING: Figure 1
Patent JP-2022134233-A (JP)
Title: Cement composition and production method thereof, alkali silica reaction inhibitor, inhibition method of alkali silica reaction
Inventor: NAKAMURA KEIICHIRO
IPC: C04B24/04
Filed: 2021-03-03
Abstract: To provide a cement composition and an alkali silica reaction inhibitor capable of exhibiting a strength of a cured product while inhibiting an alkali silica reaction, even at a low cost.SOLUTION: A cement composition includes cement, an acetic acid and a salt thereof, an aggregate and water, with an expansion coefficient of 0.05% or more in the aggregate at material age 26th week, measured in accordance with JIS A1146:2017. A content of the acetic acid or a salt thereof in anhydride conversion is preferably over 0 pt.mass to 5 pts.mass or less based on the cement 100 pts.mass. A molar ratio of acetic acid ions to total alkali ions is preferably over 0 to 2.0 or less. An alkali silica reaction inhibitor for a cement composition and an alkali silica reaction inhibition method of a cement composition are also provided.SELECTED DRAWING: None