baber/WOPTO huggingface dataset:
Patent JP-2010540392-A (JP)
Title: シリコン結晶を得るためのシリコン粉末の処理方法
IPC: C01B33/02
Filed: 2008-10-03
Abstract: 本発明の実施形態は、シリコンからシリコン結晶を得るためのプロセスに関する。この方法は、シリコンを含有する混合物を提供するために、シリコン粉末を溶媒金属と接触させるステップと、第１の融解液体を提供するために、浸漬下でシリコンを溶解させるステップと、ドロスおよび第２の融解液体を提供するために、第１の融解液体を第１のガスと接触させるステップと、ドロスと第２の融解液体とを分離するステップと、第１のシリコン結晶および第１の母液を形成するために、該第２の融解液体を冷却するステップと、第１のシリコン結晶と第１の母液とを分離するステップとを含む。
Patent JP-2010540636-A (JP)
Title: 認知機能を高める組成物及び方法
IPC: A61P25/28
Filed: 2008-10-02
Abstract: 本発明は、１つ以上の長鎖ポリ不飽和脂肪酸、酸化窒素放出化合物及び中鎖トリグリセリドを含む組成物、並びに動物の、認知機能を高め、社会的相互作用の低下を低減又は防止し、加齢に伴う行動変化を低減又は防止し、訓練可能性を高め、最適な脳機能を維持し、学習及び記憶を促進し、記憶喪失を低減し、脳老化を遅延させ、発作を予防又は治療し、認知症を予防又は治療するためにこのような組成物を使用する方法を提供する。組成物は、ヒト及びコンパニオンアニマルにおいて認知機能を高めるのに有用な食品組成物であることが好ましい。 【選択図】なし
Patent JP-2011502617-A (JP)
Title: 臭気抑制材料を含む使い捨て吸収性物品
IPC: A61F13/15
Filed: 2008-11-19
Abstract: 本発明は、体液と関連した臭気を抑制するための漂白活性化剤系を備える、おむつ及び生理用ナプキンを含む使い捨て吸収性物品に関する。漂白活性化剤系は、過酸素漂白化合物（過酸化水素源を含む）及び吸収性物品内でペルオキシ酸をその場で生成することができる漂白活性化剤化合物を含んでもよい。
Patent JP-2011505079-A (JP)
Title: 誤差補償付きオートフォーカスシステム
IPC: G03F7/20
Filed: 2008-11-20
Abstract: ワークピースの軸に沿った位置を測定するオートフォーカスシステムは、スリット光源アセンブリ、スリット検出器アセンブリ、及び制御系を含む。そのスリット光源アセンブリは、第１スリット光をワークピースの第１スリット領域に向ける。スリット検出器アセンブリは、第１スリット領域から反射した光を検出し、第１スリット領域から反射した光の量に関連する第１スリット信号をスリット検出器アセンブリにて生成する。制御系はスリット検出器アセンブリからの第１スリット信号と、第１スリット領域の第１反射情報を用いて前記軸に沿ったワークピースの位置を決定する。この設計により、オートフォーカスシステムはワークピースの反射率の変化を補償することができる。この結果、オートフォーカスシステムにより測定された測定はより正確で、ワークピースは向上した精度で位置付けられることができる。
Patent JP-2011508918-A (JP)
Title: 一般作業負荷およびグラフィックス作業負荷を処理するための統合プロセッサアーキテクチャ
IPC: G06F9/38
Filed: 2008-12-03
Abstract: １つ以上の制御ユニットと、複数の第１の実行ユニットと、１つ以上の第２の実行ユニットとを備えるプロセッサである。プロセッサ命令セットに適合するフェッチされた命令が、第１の実行ユニットに送られる。第２の命令セット（プロセッサ命令セットとは異なる）に適合するフェッチされた命令が、第２の実行ユニットに送られる。第２の実行ユニットは、グラフィックス演算を実行するように構成され、またはＪａｖａバイトコード、マネージドコード、ビデオ／オーディオ処理演算、暗号化／復号化演算などの実行のような他の特殊な機能を実行するように構成されてもよい。第２の実行ユニットは、コプロセッサのように動作するように構成されてもよい。単一の制御ユニットが、すべての実行ユニットに対するフェッチ、デコード、およびスケジューリングを処理してもよい。他の形態として、マルチ制御ユニットが、実行ユニットの異なるサブセットを処理してもよい。 【選択図】図１
Patent JP-2011509391-A (JP)
Title: 携帯及び使用に便利な電気式ガスライタ
IPC: F23Q2/32
Filed: 2009-01-02
Abstract: 本発明による電気式ガスライタは、胴体及び上記胴体に対してスライド可能なスイッチを備え、上記スイッチは、タバコ箱に嵌められ得るように弾性変形可能なクリップ部を備え、上記クリップ部は、タバコ箱の壁面厚さよりも広い幅を有するガイド部；及び、上記タバコ箱の壁面厚さよりも狭い幅を有する固定部；を備え、タバコ箱などに嵌めて携帯可能で、そのタバコ箱に取り付けられた状態で点火が可能であることを特徴とする。
Patent JP-2011510281-A (JP)
IPC: G21F9/30
Filed: 2009-01-15
Abstract: A method for conditioning a contaminated ion exchange resin includes mixing the contaminated ion exchange resin with water and at least partly breaking up the contaminated ion exchange resin into water-soluble components or fragments through the use of an oxidizing agent added to the water. A resulting aqueous solution is consolidated with a binder, optionally after concentration by evaporation of water.
Patent JP-2011510004-A (JP)
Title: タンパク質キナーゼ阻害剤及びその使用
IPC: A61K31/519
Filed: 2009-01-20
Abstract: 開示されているのは、式I：     で表される化合物であり、ここでW 1 はCR 8 若しくはN、そしてW 2 は-C-C=C-Ar;又はW 1 は-C-C≡C-Ar、そしてW 2 はCR 8 若しくはNであり;Yは_s.、-O-、-NH-、若しくは-NHCH 2 -であり;XはN若しくはN + -O'である。本発明の1つの側面は、過剰増殖性疾患及び炎症性疾患の治療に有用な、式Iで表される新規化合物を提供することである。特に、本発明の組成物は、タンパク質キナーゼ阻害剤である。よって、本発明は、第一の側面において、タンパク質キナーゼの阻害が必要な対象の治療に有用な、式Iで表される新規化合物、並びにその医薬として許容される塩及び医薬として活性な誘導体を提供する。式Iにおける記号の意味及び具体的な意味は、以下の文章中に提供される。
Patent JP-2011511443-A (JP)
Title: 放射受光器およびその製造方法
IPC: H01L31/00
Filed: 2008-12-17
Abstract: 放射の検出に使用される第１の活性領域２１０および第２の活性領域２２０を有する半導体ボディ２を備えている放射受光器１を開示する。第１の活性領域２１０および第２の活性領域２２０は、垂直方向に互いに隔置されている。第１の活性領域２１０と第２の活性領域２２０との間にはトンネル領域２４が配置されている。トンネル領域２４は接続面３１に導電接続されており、接続面３１は、第１の活性領域２１０と第２の活性領域２２０との間で半導体ボディ２に外部から電気的に接触する目的で使用される。さらに、放射受光器を製造する方法も開示する。
Patent JP-2011512468-A (JP)
Title: 基盤上にレールを固定するシステムおよび装置
IPC: E01B9/34
Filed: 2008-02-22
Abstract: 【課題】支持要素の充分な位置固定を確保できる簡単な態様で組立てられるレール固定システム、および不利な組立て条件および作動条件下でも簡単な態様で確実に取付けられるレール固定装置を提供することにある。 【解決手段】支持要素（２０、２１）が組立て位置において、基盤（Ｕ）上に支持される支持ラグ（３２ａ〜３２ｄ）を有し、かつ、そのプロセスで、該支持ラグ（３２ａ〜３２ｄ）を介してガイドプレート（１３、１４）が基盤上に支持されるように、支持ラグ（３２ａ〜３２ｄ）が、ガイドプレート（１３、１４）と支持ラグ（３２ａ〜３２ｄ）とがオーバーラップする領域内で、ガイドプレート（１３、１４）の載置面の下に到達する構成により、レールの固定は特に簡単な態様で行われる。 【選択図】図１ａ
Patent JP-2011513753-A (JP)
Title: 分子の高感度検出の方法および組成物
IPC: G01N33/543
Filed: 2009-03-04
Abstract: 本発明は、分子の高感度検出を用いて被験体における状態を検出及びモニタリングする方法を開示している。本発明は、被験体における状態を検出またはモニタリングする方法を提供し、その方法は、被験体からの第１試料中の第１マーカーの検出、および第２マーカーの検出を含み、第１マーカーには、バイオマーカー、例えば心筋トロポニン−Ｉ（ｃＴｎＩ）または血管内皮増殖因子（ＶＥＧＦ）が含まれ、第１マーカーの検出限界は１０ｐｇ／ｍｌ約より小さい。第２マーカーは、バイオマーカー、生理学的マーカー、分子マーカーまたは遺伝子マーカーであり得る。
Patent JP-2012141916-A (JP)
Title: Program modification supporting method and program modification supporting apparatus
Inventor: KUNISHIMA MASAO
IPC: G06F11/36
Filed: 2011-01-06
Abstract: PROBLEM TO BE SOLVED: To provide a program modification supporting method and a program modification supporting apparatus which do not need to create a new specification on the apparatus.SOLUTION: A program modification supporting apparatus 1 for supporting modification of a program includes: a scheduled modification reproduction section 12 for creating predictive structure data 900 when information has been modified as scheduled on the basis of scheduled modification data 800 which is information on a portion to be modified and a source code 101 before modification; a modification place specification section 21 for creating modification place specification data 1100 on the basis of a source code 102 after modification; and a modification content verification section 22 for comparing the predictive structure data 900 and the modification place specification data 1100, and making a display section 50 display information indicating that a mismatch portion is detected when detecting the mismatch portion.
Patent JP-2012147065-A (JP)
Title: Radio terminal device and radio communication method
Inventor: SHIRAIWA NOBUYUKI
IPC: H04M1/00
Filed: 2011-01-07
Abstract: PROBLEM TO BE SOLVED: To provide a radio terminal device capable of controlling a period of time from when communication start is attempted to when the communication is actually started in a plurality of communication methods, and to provide a radio communication method.SOLUTION: A control part 60 of a mobile phone unit 1 controls a radio communication part 30 to transmit a communication start request upon start of data communication in a Long Term Evolution (LTE) system. When the control part 60 receives information indicating that communication is available to the communication start request, the control part 60 controls the radio communication part 30 to start the data communication in the LTE system. Moreover, when the control part 60 of the mobile phone unit 1 fails to receive the information indicating that the communication of the radio communication part 30 is available, the control part 60 controls the radio communication part 30 to start a radio connection in a Code Division Multiple Access (CDMA) system.
Patent JP-2012146408-A (JP)
Title: Device and method for generating ion beam
Inventor: FUJIWARA YUKIO
IPC: H01J27/02
Filed: 2011-01-07
Abstract: PROBLEM TO BE SOLVED: To provide a device and method capable of solving the problems in an ion beam generating device in which a solution including ionic liquid is discharged into the gas phase by the electro-spray method that the ionic liquid with little vapor pressure is not volatilized even in a vacuum so that the ionic liquid is stored in a vacuum vessel and that the generation amount of secondary ion have to be increased when ion beams are used as the primary ion beam sources for secondary ion mass spectrometry (SIMS).SOLUTION: In addition to a non-volatile ionic liquid, another liquid with volatility is supplied to a fine pipe for electro-spray (capillary) to produce ion beams composed of both components, so that the total amount of the ionic liquid stored in a vacuum vessel can be reduced and the generation amount of secondary ion can be increased.
Patent JP-2012144889-A (JP)
Title: Manhole cover mounting/demounting device, heat exchanger, and mounting/demounting method
Inventor: YAMAMOTO TAKASHI
IPC: E02D29/14
Filed: 2011-01-11
Abstract: PROBLEM TO BE SOLVED: To provide a mounting/demounting device for achieving downsizing and simpler work for mounting/demounting a manhole cover.SOLUTION: The mounting/demounting device includes a first arm having an arm member, a rotating mechanism part, and a supporting member, a second arm having first to third joint members, and first and second rotating arms for connecting the first rotating arm to the supporting member and the first rotating arm to the second rotating arm via the first and second joint members, respectively, a turning part for turning the first to third joint members, a device body part to be connected to the second rotating arm via the third joint member, and a control part for controlling the turning of the turning part to move the first arm to the front/rear side of a manhole seat in its projecting direction.
Patent JP-2012144485-A (JP)
Title: Blood sugar concentration rise inhibitor
Inventor: ISHIMARU KOTOMI
IPC: A61K31/785
Filed: 2011-01-12
Abstract: PROBLEM TO BE SOLVED: To provide a blood sugar concentration rise inhibitor which can adjust a blood glucose level in a body in a normal range by controlling a blood sugar concentration rise after meal, and is useful for the decrease, prevention, improvement, moderation or treatment of a crisis risk of diabetes, obesity or arteriosclerosis.SOLUTION: The blood sugar rise concentration inhibitor includes a polyglutamic acid in which a carboxyl group of a γ position and an amino group of an α position of glutamic acid are peptide-bonded and at least 50% of a hydrogen atom of the carboxyl group is substituted with potassium, as an active constituent.
Patent JP-2012144922-A (JP)
Title: Rubber protective plate
Inventor: MASAGO KAZUTAKA
IPC: E01B19/00
Filed: 2011-01-13
Abstract: PROBLEM TO BE SOLVED: To provide a rubber protective plate capable of easily and surely protecting a railroad device arranged on a route from ice and snow mass falling from a traveling train.SOLUTION: The rubber protective plate protects an impedance bond cable connecting a rail and an impedance bond in a slab track 300 from ice and snow mass falling from a traveling train, and a protective plate body 100 disposed on a train advancing direction front side of the cable is made of a block member of ethylene-propylene-diene rubber (EPDM). On the side facing an advancing train of the protective plate body 100, an inclined surface part 110 having an upward inclination in the advancing direction of the train is provided. The protective plate body 100 is fixed to a bed concrete part 310 of the slab track 300 by an anchor bolt 210 and a fixing nut 220, and ice and snow mass falling from a train are received at the inclined surface part 110 of the protective plate body 100.
Patent JP-2012143991-A (JP)
Title: Image forming apparatus
Inventor: TAO KOZO
IPC: B41J5/30
Filed: 2011-01-13
Abstract: PROBLEM TO BE SOLVED: To allow an A3 machine to use an ASIC for an A4 machine in which a processing width of images is supported only up to a Letter width, and maximize the printing performance of the A3 machine.SOLUTION: An image forming apparatus includes: a memory buffer 8 having a plurality of band buffers 8-1 to 8-4 storing band data in which image data are divided into a plurality of bands; a data processing section 21 performing a specific process with respect to the image data; an output processing section 7 performing a printing process based on the image data; and a storage means 9 storing the image data after the specific process is performed at the data processing section 21 and sending the same to the output processing section 7. The storage means 9 has a storage area that can store the image data of a plurality of pages.
Patent JP-2012148789-A (JP)
Title: Container with lid
Inventor: NAKAO KUMIKO
IPC: B65D43/20
Filed: 2011-01-18
Abstract: PROBLEM TO BE SOLVED: To provide a container with a lid which does not make a container body easily fall down due to a moment produced on a lid hinged upon the opening of the lid and consequently, there is no risk of spilling of stored material even when the stored material is reduced or even when the container body has such a shape that the diameter is expanded toward the upper side.SOLUTION: The container with the lid includes a container body 1 and a lid body 2 connected to the container body 1 via a hinge member 5, wherein the lid body 2 is supported by the hinge member 5 to be slidable in the lower direction upon the opening of the lid. The middle part of the hinge member 5 is freely bendable and expandable, one end part thereof is fixed to the container body 1 side and the other end part side thereof is made a locking part 11 to the lid body 2 and supports the lid body 2 to be slidable. The one end part of the hinge member 5 is fixed to an upper edge frame 4 fit to the upper edge part of the container body 1.
Patent JP-2012151046-A (JP)
Title: Connector
Inventor: FUJII MASAYASU
IPC: H01R13/71
Filed: 2011-01-20
Abstract: PROBLEM TO BE SOLVED: To reduce the number of components.SOLUTION: A connector A comprises: a first housing 10; a second housing 30 which can be fitted to the first housing 10; a pair of detection terminals (a tab-shaped terminal 16 and a multifunctional terminal 20) which are provided on the first housing 10, and which are not in contact with each other when the first housing 10 and the second housing 30 are not properly fitted to each other, with at least one of them being elastically bendable; and a lock arm 40 (a short-circuit functional part) which elastically bends the tab-shaped terminal 16 (the detection terminal on the elastically bendable side) so as to bring it into contact with the multifunctional terminal 20 (the detection terminal on the mating side) only when the first housing 10 and the second housing 30 are fitted to each other.
Patent JP-2012152306-A (JP)
Title: Beauty appliance
Inventor: OKAMOTO YUSUKE
IPC: A61F7/00
Filed: 2011-01-25
Abstract: PROBLEM TO BE SOLVED: To provide a beauty appliance shortening a head cooling preparation period and reducing power consumption; and to provide a beauty appliance enhancing safety and reliability by preventing a short circuit and a malfunction caused by the adhesion of lotion to an electronic component and the like mounted on a circuit board, even in such a case that the lotion intrudes into a body case, and by eliminating the case of bringing the beauty appliance into an overheated state.SOLUTION: The beauty appliance includes the body case 1, a head 2 for cooling a skin surface, a cooling unit 12 that includes a thermoelectric conversion element 44 for cooling the head 2, a heat sink 30 for heat dissipation, which is connected to the cooling unit 12, and a blast means 31 for supplying heat exchange air to the heat sink 30. The drive of the thermoelectric conversion element 44 and the blast means 31 is started by operations of switches 3 and 4 that are provided in the body case 1; and control is performed so that the drive of the blast means 31 can be stopped after a lapse of predetermined time and so that the drive of the thermoelectric conversion element 44 can be stopped after a further lapse of predetermined time.
Patent JP-2012152139-A (JP)
Title: Method for producing food raw material consisting mainly of konjak mannan
Inventor: ITO SHUSUKE
IPC: A23L19/00
Filed: 2011-01-26
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a food material consisting mainly of konjak mannan to have palate feeling and taste of meat, and also good for health.SOLUTION: The method includes: adding water to powdery konjak mannan to be swollen so as to be turned into slurry konjak mannan; admixing water-insoluble protein-based food and thickening material to the mannan to knead the mixture followed by admixing calcium hydroxide to the mixture and stirring the resultant mixture; heating the mixture to be coagulated so as to form a food-kneaded-in konjak-like mold; slicing, cutting or shredding the food-kneaded-in konjak-like mold in an optional width and thickness to form sliced pieces, cut pieces, or shredded pieces; impregnating, at the same time, the sliced pieces, the cut pieces or the shredded pieces with meat extract, seasonings and spices; and thereafter heating the pieces to be formed into dried or half-dried ones having water content of 5-50%.
Patent JP-2012157225-A (JP)
Title: Insulation member and stator
Inventor: NAKADA KAZUTOSHI
IPC: H02K3/34
Filed: 2011-01-28
Abstract: PROBLEM TO BE SOLVED: To provide an insulation member easily enabling insulation between coil conductors adjacent to each other in a coil end in the vicinity of a slot.SOLUTION: An insulation member 30 includes a slot insertion part 32 for insertion into a slot, folding-back parts 34, 35 and coil wire insulation parts 36, 37. The coil wire insulation parts 36, 37 extending from the slot insertion part 32 to a direction of a coil end direction enable electrical insulation between coil wires adjacent to each other which extend toward the coil end at an outlet portion of the slot.
Patent JP-2012159304-A (JP)
Title: Fitting clip for battery temperature sensor
Inventor: NISHIDA RYUHEI
IPC: H01M10/48
Filed: 2011-01-28
Abstract: PROBLEM TO BE SOLVED: To enable a fitting clip for a battery temperature sensor to be enhanced in, or at least maintained at a satisfactory level of, fitting accuracy by preventing the temperature sensor from coming off, shifting or suffering backlash.SOLUTION: A clip (10) comprises a contact part (40) in contact with the external surface of a case (30), an insertion hole (41) through which a sensor body (21) can be inserted, a holding cylinder (50) through which the sensor body (21) can be inserted and which can hold a bulgy part (22) therein, a leg cylinder (60) that can be inserted into a fitting hole (31), and elastic claws (62) that can keep the case (30) between themselves and the contact part (40). The contact part (40) is provided with at least a pair of ribs each of which is positioned at one or the other end of the contact part (40) in the diametric direction, protrudes toward the external surface of the case (30) and causes, when the case (30) is to be kept between a pair of the elastic claws (62) and the contact part (40), a force in the direction to loosen the contact part (40) and narrow an open end face (51) to work on the holding cylinder (50).
Patent JP-2012159109-A (JP)
Title: Vibration control device capable of detecting external force
Inventor: SENBA ATSUHIKO
IPC: G01L5/16
Filed: 2011-01-31
Abstract: PROBLEM TO BE SOLVED: To provide a vibration control device with a novel structure capable of fulfilling highly accurate detection of an input load with a sufficient durability and practicability, and of detecting external force.SOLUTION: A capacitive sensor 18 in which a pair of electrode films 22, 22 composed of an electric conductive elastic member is provided to both sides of a dielectric material layer 20 composed of a dielectric elastic member is arranged in a state to extend in the operation direction of tensile force to a body rubber elastic body 16 when external force acts between a first attachment member 12 and a second attachment member 14, and is firmly fixed to the body rubber elastic body 16.
Patent JP-2012160904-A (JP)
Title: Information processor, information processing method, program, and imaging apparatus
Inventor: TOKUNAGA AKIRA
IPC: H04N5/91
Filed: 2011-01-31
Abstract: PROBLEM TO BE SOLVED: To provide an information processor, an information processing method, a program, and an imaging apparatus enabling a composite image of panoramic images etc. to be generated with operational ease.SOLUTION: The information processor comprises: a calculation part for calculating the display range 51 of an input image 50; a setting part for setting a containing range 61 containing at least a part of the calculated display range 51; a retrieval part for retrieving an image to be composed 70 related with the input image 50; a disposition part for disposing the retrieved image to be composed 70 in the containing range 61; a determination part for determining an area in which the image to be composed 70 is not disposed, within the containing range 61, as an area short of images; and a notification part for notifying a user of information on the determined area short of images. This enables the accurate panoramic image 60 to be generated with operational ease.
Patent JP-2012164160-A (JP)
Title: Information processor, screen display method and program
Inventor: SHIBATA MITSUO
IPC: G06F3/0484
Filed: 2011-02-07
Abstract: PROBLEM TO BE SOLVED: To provide an information processor, a screen display method and a program which can redisplay a screen image desired by a user for browsing without requiring complicated operations.SOLUTION: An information processor comprises: a display control unit 104 for displaying a screen image displaying data of specified items on an operation display unit 120; an input control unit 101 for receiving selection of either a first registration instruction instructing registration of a screen image displaying the data or a second registration instruction instructing registration of a screen image displaying the latest data of the items; and a registration unit 102 for, when the first registration instruction is received, storing the data and a first ID for identifying the screen image displaying the data in a storage unit 110, and when the second registration instruction is received, storing a second ID for identifying the screen image displaying the latest data of the items in the storage unit 110.
Patent JP-2012163173-A (JP)
Title: Clamp device for connection
Inventor: ITO NORIO
IPC: F16L33/08
Filed: 2011-02-08
Abstract: PROBLEM TO BE SOLVED: To provide a clamp device 1 for connection which allows a tightening force to a hose 2 to be visually checked to facilitate external determination whether the tightening force is proper or not during inspection, and allows easy management of the tightening force, thereby enabling proper quality control.SOLUTION: In rotating a screw 8, a tensile force F in a circumferential direction W2 is applied directly to a strap band 3, so that the tensile force F serves as a highly reliable index of the tightening force. A test table showing a relation between displacement Δ1, Δ2 of a displaceable part 13 and a tensile force F or a tightening force is prepared. The displacements Δ1, Δ2 visually indicate the actual tightening force to facilitate determination with a simple means whether the hose 2 is tightened with a proper tightening force or not, thereby facilitating management.
Patent JP-2012162788-A (JP)
Title: Method for manufacturing high carbon high manganese steel material
Inventor: ITO TOSHIYUKI
IPC: C22C38/06
Filed: 2011-02-09
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing a high carbon high manganese steel material capable of preventing bottom cracks, and hook cracks in welded portions, occurring in a case of producing a steel pipe by bending and welding a steel sheet.SOLUTION: A steel raw material is casted which has a composition including, by mass%, 0.40 to 0.50% C, 0.10 to 0.30% Si, 1.50 to 1.70% Mn, ≤0.08% P, ≤0.01% S, 0.010 to 0.030% Al, 0.0015 to 0.0035% Ca, further Ca/S being 0.3 to 0.6, and the balance of Fe and inevitable impurities. Then, the steel raw material is gradually cooled down to 450°C or lower in such a manner that a cooling rate of the steel raw material is 10°C/h or lower in a time average in a range of from 700 to 450°C at a surface temperature of the steel raw material when measuring the temperature at the surface of the steel raw material, and, thereafter, hot rolling is successively performed.