baber/WOPTO huggingface dataset:
Patent JP-2007500361-A (JP)
Title: ひずみに基づく器具のための改善されたたわみシステム
IPC: G01G3/14
Filed: 2004-05-20
Abstract: センサ本体に対する力を測定するためのデバイスであって、梁（１１０）を備える。少なくとも１つの凹部を備えるアレイ（１２０）が、この梁に形成される。このアレイは、１．０未満の長さ対高さの比を有する。少なくとも１つのひずみ変換器（１３０）が、少なくとも１つの凹部に設置され、ここで、このデバイスは、センサ本体に組み込まれる場合、全体的な低い偏向を提供するために十分に剛性であり、一方で、十分に高い距離ひずみレベルを提供する。Ｕ字型金具を有するフレームデバイスもまた、提供される。さらに、ひずみ計、膨張計、または直径方向伸び計。トルクが、同心状リングおよびスポークを保有する凹部で測定される。
Patent JP-2007516069-A (JP)
Title: 磁気選別機装置
IPC: C07F7/16
Filed: 2004-06-08
Abstract: 有害な、すなわち、腐食性、可燃性、毒性又はかかる有害な要因を組合せて有する可能性のある、液体、蒸気及び気体の存在下で、微粉固体を選別するのに有用である磁気選別機装置、並びにクロロシランの製造方法におけるかかる装置の使用。
Patent JP-2007509326-A (JP)
Title: 半固体材料を検査するための方法および装置
IPC: G01N3/56
Filed: 2004-10-15
Abstract: 半固体材料の特性を評価するための方法および装置が提供される。この方法および装置は、口紅、リップ軟膏、およびデオドラントスティックのようなスティック形状の半固体化粧品を検査するのに特に十分に適している。この方法は、材料の検査試料が、制御条件下で基板に対して移動されたときに、基板上への半固体材料の堆積率を検査するステップを含む。この方法は、検査試料が、制御条件下で基板に対して移動されたときに、材料の検査試料に対する引きずりを測定するステップも含む。例示されている検査装置により、研究者が、検査試料に関するこれらの検査を行うことが可能になる。この検査により、再現可能な定性データが得られ、このデータは、粘稠度について半固体材料の種々のバッチを比較するために用いることができ、研究開発の目的のために、半固体材料に関する人体検査パネルの定性データに相関させることができる。
Patent JP-2007510377-A (JP)
Title: 透明マルチモードｐａｍインタフェース
IPC: H04L25/03
Filed: 2004-10-26
Abstract: 高速、マルチモードＰＡＭシンボル送信のための方法および装置が提供される。マルチモードＰＡＭ出力ドライバは、一つ以上のシンボルを駆動し、一つ以上のシンボルのＰＡＭ変調において用いられるレベルの数は、ＰＡＭモード信号の状態に依存している。さらに、一つ以上のシンボルは、シンボルレートで駆動され、該シンボルレートは、ＰＡＭモード信号に従って選択され、その結果駆動されたシンボルのデータレートが、ＰＡＭモード信号の状態の変化に関して一定である。所与の物理環境でのシンボル送受信について、ＰＡＭレベルの最適数を決定する方法が、さらに提供される。
Patent JP-2007511491-A (JP)
Title: キナゾリン誘導体
IPC: C07D409/12
Filed: 2004-11-11
Abstract: 抗増殖効果の発現において使用するための、置換基が明細書中で定義されるとおりの式（Ｉ）のキナゾリン誘導体：この効果は、ヒトのような温血動物において単独又は部分的にｅｒｂＢ２受容体型チロシンキナーゼを阻害することによって発現される。
Patent JP-2007511441-A (JP)
Title: 揺れ制御のためのシステム及び方法
IPC: B25J9/16
Filed: 2004-10-27
Abstract: 積み荷搬送システム（２００、６００）における揺れの測定及び制御のためのシステム、方法及びコンピュータプログラムコードが提供され、これらのシステム、方法及びコンピュータプログラムコードはクレーンからつり下げられた積み荷のようなつり下げられた積み荷（１０８）の揺れを測定及び制御するためにマイクロ・エレクトロ・メカニカルシステム（ＭＥＭＳ）デバイス（２０２、２０４、３０２、３０４、６０２）を使用することを含む。
Patent JP-2007512498-A (JP)
Title: 太陽熱温水器
IPC: F24S90/00
Filed: 2004-11-18
Abstract: 一体型貯蔵コレクタ太陽熱温水システムが開示される。システムはタンクおよび２つの吸収器を含み、システム全体は水でいっぱいである。水の循環はタンクの底部からフィンチューブ吸収板を通り抜けて進み、該フィンチューブ吸収板は太陽にさらされる透明なカバーと絶縁板との間に設置される。温水は、それを使用温度に加熱し、かつタンクの空間に流し込む第２吸収器を通過する。第２吸収器は、タンクの内壁に取り付けられる熱絶縁層に溝形に形成されるトンネルの格子によって、タンクの露出壁との間に作られる。第２吸収器も透明なカバーで覆われる。水はタンクの上部に流れ込み、熱サイフォン弁は逆流を阻止する。２回の加熱後に、水はタンク内に貯蔵され、使える状態にある。システムはまた、電気的加熱オプションと、凍結の場合に収縮するフィンチューブ吸収器内の可撓性ターボレータと、同じ目的のためのタンク内の可撓性手段とを有することがある。 【選択図】図１
Patent JP-2007512381-A (JP)
Title: 医薬的組み合わせ
IPC: A61P19/02
Filed: 2004-11-30
Abstract: 少なくとも１個のｍＴＯＲ阻害剤を含む医薬的組み合わせならびに関節炎またはリウマチ性関節炎およびそれに附随する障害の処置におけるそれらの使用。
Patent JP-2007521139-A (JP)
IPC: B23K1/19
Filed: 2004-12-03
Abstract: A flux or a flux preparation, which contains complex alkali metal fluorides and additionally includes a water-soluble polymer, preferably polyvinyl alcohol or a polyvinyl alcohol derivative. The water-soluble polymer may be contained in the flux preparation as a granulate or powder or used as a water-soluble package for the flux or flux preparation.
Patent JP-2007520333-A (JP)
Title: 一酸化炭素の変換用触媒
IPC: C01B3/16
Filed: 2004-10-29
Abstract: 所定気孔寸法を有する支持体と、金属カルボニル物質を形成しうる金属とからなる一酸化炭素の変換用触媒につき開示する。１具体例において、本発明の触媒はモルデナイト、β−ゼオライトもしくはホージャサイト支持体とルテニウム金属とを含む。
Patent JP-2007515592-A (JP)
Title: 消音器固定装置
IPC: F04D29/42
Filed: 2004-12-10
Abstract: 【解決手段】  消音器は、第１の結合領域１２、２２内において、固定要素３を用いて、強固に圧縮機ケーシングに固定されている。第２の結合領域１３、２３内において、この消音器は、当接面でもって、圧縮機ケーシングの当接面の上に載置されており、その際、この消音器が、この第２の結合領域内における当接によって、この第1の結合領域内における強固な固定に対して、予緊張でもって付勢されている。予緊張によって、消音器の固有振動数は高められ、このことによって、この消音器の許容されない揺動の過度の上昇が防止される。
Patent JP-2007517115-A (JP)
Title: 低ｋファクターの硬質フォーム系
IPC: C08G18/40
Filed: 2004-12-21
Abstract: 本発明は、イソシアネートと、芳香族アミン開始のポリエーテルポリオール、芳香族ポリエステルポリオール、および所望により、スクロースに基づくポリエーテルポリオールを含有するポリオール成分とを混合することによって製造される硬質ポリウレタンフォームを提供するものである。本発明のフォームは、３５°Ｆにおける約０.１１５〜約０.１２０ ＢＴＵ-ｉｎ／ｈｒ・ｆｔ ２  °Ｆの初期ｋファクターによって示されるような良好な特性を有しており、建設および冷却工業において絶縁材料として使用される。
Patent JP-2007517985-A (JP)
Title: 微粉化セルロース繊維を含む粉末金属混合物
IPC: C04B35/636
Filed: 2004-02-24
Abstract: 粉末金属混合物が、従来から粉末金属部品を作るのに用いられてきた潤滑剤粉末と微粉化セルロース繊維とを組み合わせたものを重量で混合物の２％未満の量含む。潤滑剤と共に繊維を加えることにより混合物を成形してできた部品の湿態強度を増しかつ寸法適合性を改善する。
Patent JP-2007522320-A (JP)
IPC: C08K5/098
Filed: 2005-02-04
Abstract: The invention relates to a polyolefin composition comprising a water releasing additive comprising hydrated inorganic or organic compounds as well as to a process for prevention of discoloration in polyolefins.
Patent JP-2007522580-A (JP)
IPC: G07F7/10
Filed: 2005-02-07
Abstract: A processor compares biometric template with biometric sample received from external arrangement and completes handshake process with external arrangement. The processor performs application specific function and transmits the application specific function result to external arrangement if the biometric sample matches with biometric template. Independent claims are also included for the following: (1) data transfer method; (2) storage medium storing data transfer program; (3) external arrangement; and (4) data transferring system.
Patent JP-2008175838-A (JP)
Title: Liquid crystal display device
Inventor: UCHIDA TATSUO
IPC: G02F1/1337
Filed: 2007-01-16
Abstract: <P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of efficiently inducing a splay-bend transition and having a satisfactory numerical aperture.  <P>SOLUTION: In the liquid crystal display device, minute structural bodies are disposed in such positions wherein the numerical aperture is not affected and an electric field between a TFT substrate 3 and a CF substrate 4 can be applied to two minute regions, particularly to stable homogeneous regions.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008175578-A (JP)
Title: Vibrator for piezoelectric vibrating gyroscope
Inventor: MIZUNO TAKESHI
IPC: G01C19/56
Filed: 2007-01-16
Abstract: <P>PROBLEM TO BE SOLVED: To provide a compact, low-cost and high-performance vibrator for piezoelectric vibrating gyroscope, which is in a simple shape, has a simple electrode structure and enables a vibrator configuration to be realized in a two-axis detection.  <P>SOLUTION: The vibrator for piezoelectric vibrating gyroscope using a torsional vibration mode due to a piezoelectric slip effect as a drive vibration mode comprises two first columnar arm parts 43a, 43b each being vertically connected with a second columnar arm part 42. The vibrator in a flat-plate form is made up of a piezoelectric single crystal integrally. In the piezoelectric vibrating gyroscope-use vibrator, strip detection electrodes 45a, 45b, 45c and 45d, and reference potential electrodes 46a, 46b are formed on front-back both sides of the first arm parts 43a, 43b, and strip drive electrodes 44a, 44b are formed on front-back both sides of the second arm parts 42.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008177046-A (JP)
Title: Electrode for solid polymer fuel cell, its manufacturing method, and solid polymer fuel cell equipped with it
Inventor: TOYOSAWA SHINICHI
IPC: H01M4/96
Filed: 2007-01-18
Abstract: <P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an electrode for a solid polymer fuel cell capable of reducing carrying amount of a metal catalyst and capable of suppressing voltage drop in a large current region.  <P>SOLUTION: This is the manufacturing method of an electrode for solid polymer fuel cell equipped with a conductive porous substrate, carbon fiber arranged on the conductive porous substrate, and a metal catalyst carried on the carbon fiber, and comprises (i) a process to apply a water repellency treatment on one of the surfaces of the conductive porous substrate, (ii) a process to produce a fibril-like polymer by electrolytic oxidation polymerization of a compound having an aromatic ring on the other surface of the conductive porous substrate, (iii) a process to produce carbon fiber on the conductive porous substrate by calcining the fibril-like polymer, and (iv) a process to have the metal catalyst carried on the carbon fiber.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008174355-A (JP)
Title: Tension control device and tension control method
Inventor: TOYOOKA KOJI
IPC: B65H23/192
Filed: 2007-01-18
Abstract: <P>PROBLEM TO BE SOLVED: To provide a tension control device and a tension control method for performing the control that the tension generated in a base material to be conveyed rapidly and correctly reaches a target value when conveying the base material by a roll-to-roll system.  <P>SOLUTION: The control period of the PID control and each control constant are changed based on the tension deviation (e) between the measured value (PV) of the tension in a base material 10 to be conveyed and the target value (SV) of the tension in the base material 10 which is obtained in advance by an experiment or the like (S3, S4). The control quantity by the PID control to allow the tension to reach the target value is computed (S7). The tension in the base material 10 is controlled by changing the rotational speed of an outer field roll 4 based on the computed control quantity (S8).  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008173728-A (JP)
Title: Atomic force microscope microprocessing device and microprocessing method using atomic force microscope
Inventor: TAKAOKA OSAMU
IPC: B82B3/00
Filed: 2007-01-19
Abstract: <P>PROBLEM TO BE SOLVED: To attain high accuracy of processing of an atomic force microscope microprocessing device and to make it possible to remove process waste produced in a cutting step by a process probe.  <P>SOLUTION: The atomic force microscope microprocessing device is wholly or partially, in a portion including a cantilever 2 and a processing region, evacuated to be in a vacuum atmosphere to reduce the resistance of air and to improve the Q value of resonance, so that the cantilever 2 having a high spring constant and less torsion or bend which can not be conventionally used because of damages induced even only upon imaging, can be used for observation an processing, and thereby, controllability of a probe 1 during processing is improved to achieve high accuracy processing. Further, process waste produced during cutting with the process probe 1 is sucked and removed by the device evacuating system or the local evacuating system 3A.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008181265-A (JP)
Title: Estimation contents inspection system
Inventor: IIDA HIROSHI
IPC: G06Q50/00
Filed: 2007-01-24
Abstract: <P>PROBLEM TO BE SOLVED: To provide an estimation contents inspection system allowing inspection of whether an estimated amount of money is proper or not to improve the satisfaction degree of a user.  <P>SOLUTION: This estimation contents inspection system has: a WEB server 11 for a customer capable of communicating with a customer terminal 21 used by the customer; a WEB server 12 for a dealer capable of communicating with a dealer terminal 31 used by the dealer; and a DB server 13 at least permitting access from the WEB server 12 for the dealer. The WEB server 11 for the customer has a control part receiving estimation request data transmitted from the customer terminal 21. In the DB server 13, estimation contents inspection criterion data that are a criterion for deciding whether an estimation is proper or not is stored. The WEB server 12 for the dealer has a control part comparing estimation data received from the dealer terminal 31 and the estimation contents inspection criterion data stored in the DB server 13 to decide whether contents of the input estimation data are proper or not.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008182849-A (JP)
Title: Train control system
Inventor: NAMEKI HIDEAKI
IPC: B60L15/40
Filed: 2007-01-25
Abstract: <P>PROBLEM TO BE SOLVED: To provide a train control system for controlling trains while considering a gradient and a curve without requiring expensive on-vehicle apparatuses and/or ground facilities, thereby improving riding quality.  <P>SOLUTION: The train control system is provided with: a speed detecting means 3 for detecting the train speed of an own train; a gradient detecting means 4 for detecting the gradient or gradient acceleration of the route where the own train travels; and an ATC apparatus 5 for determining control commands in response to speed limit information set on the route where the own train travels, the train speed to be detected by the speed detecting means, and the gradient or gradient acceleration detected by the gradient detecting means, and outputting the commands to a driving/braking apparatus.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008181822-A (JP)
Title: Battery pack, and its manufacturing method
Inventor: OKADA WATARU
IPC: H01M10/625
Filed: 2007-01-25
Abstract: <P>PROBLEM TO BE SOLVED: To effectively inhibit high temperature heat conduction via an electrode terminal.  <P>SOLUTION: This is a battery pack in which a plurality of battery cells are adjoined and connected in series and/or in parallel with each other, and is equipped with the plurality of the battery cells in which positive and negative electrode terminals 12 are projected from one end face, and the plurality of separators which connect the electrode terminals 12 to each other and which insulate and heat-insulate the battery cells by being respectively interposed between conductive heat-sensitive shutoff members 80 for releasing a connection state according to heat. The heat-sensitive shutoff members 80 are constituted so as to be fused when heated to a temperature equal to or higher than a predetermined temperature, and so as to release a physical connection between the electrode terminals 12. By this, even if a part of the battery cells abnormally generates heat, the heat is insulated by the separators between the mutually adjoining battery cells, and even as for the heat to be conducted through the electrode terminals 12, the heat-sensitive shutoff members 80 are fused by the heat to divide a heat conductive passage, and a situation can be inhibited in which abnormal heating spreads catenately.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008185616-A (JP)
Title: Secret key ciphering method, secret key ciphering device and computer program
Inventor: OSAWA HIROYUKI
IPC: G09C1/00
Filed: 2007-01-26
Abstract: <P>PROBLEM TO BE SOLVED: To provide a secret key ciphering method or the like of a ciphering encode system high in cipher strength irrespective of relatively low processing, which can be mounted on equipment incorporated with a low-performance CPU, a server apparatus for ciphering large amounts of data at once or the like.  <P>SOLUTION: The secret key ciphering method of performing ciphering processing by using a secret key comprises: a secret key producing step of producing the secret key by using a hash function (MD5 algorithm); and a ciphering step of performing an exclusive OR operation (XOR operation) by the use of the secret key produced by the secret key producing step and, thereby, performing the ciphering.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008185691-A (JP)
Title: Scanning optical device, and image forming apparatus mounted with the same
Inventor: KURIHARA TAKAYUKI
IPC: G02B26/10
Filed: 2007-01-29
Abstract: <P>PROBLEM TO BE SOLVED: To provide a scanning optical device in which a defect such as a noise is not caused and effective cleaning is performed when the surface of a light transmissive member furnished on an open part through which a light beam passes is cleaned with an elastic cleaning member, and a high quality image can be obtained.  <P>SOLUTION: The scanning optical device 20 is provided with: the open part 26 through which the light beam passes toward a face to be scanned; a dust glass 27 which is the light transmissive member provided on the open part 26; a cleaning blade 63 which is the elastic cleaning member which presses and wipes the surface of the dust glass 27; and a control member 64 which prevents the separation of the cleaning blade 63 from the dust glass 27. Thus, the cleaning blade 63 and the dust glass 27 are strongly pressure-contacted to each other at their contact part, and the cleaning blade 63 is brought into close contact with the surface of the dust glass 27 uniformly in the whole region in the longitudinal direction, that is, a main scanning direction.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2007161248-A (JP)
Title: Shock absorbing floor spacer for vehicle
Inventor: TOKITA HIDEAKI
IPC: B60R21/02
Filed: 2007-01-29
Abstract: <P>PROBLEM TO BE SOLVED: To provide a shock absorbing floor spacer for a vehicle improved in comfortableness and safety against an impact by weight reduction of a structural member.  <P>SOLUTION: This shock absorbing floor spacer for an automobile formed from a hard foam material and to be laid on a floor of an automobile is formed of a flat part 1 and an inclined part 2 protruded forward of the flat part 1, and the floor spacer is formed with a thick part on a cabin side of the automobile, while formed with shock absorbing parts 12 and 22 of honeycomb structure, slit structure and/or projection structure on the floor surface side. Heights of the honeycomb structure, the slit structure and/or the projection structure are set at 50% or more of the thickness of a floor spacer main body.  <P>COPYRIGHT: (C)2007,JPO&INPIT
Patent JP-2008187468-A (JP)
Title: Image processor and program
Inventor: YAOYAMA TAKAHIRO
IPC: G06F12/16
Filed: 2007-01-30
Abstract: <P>PROBLEM TO BE SOLVED: To provide an image processor and a program for enabling the operator of a device to easily recognize an error, and to instantaneously execute the countermeasures.  <P>SOLUTION: This image processor is provided with a memory mounting means for mounting an attachable/detachable non-volatile memory; an error detection means for detecting an error to be generated in using the non-volatile memory; an error information storage means for prestoring error content information showing the content of an error to be generated in using the non-volatile memory and error countermeasure information showing countermeasures to the error; and an error information notification means for notifying an operator of the error content information and the error countermeasure information. When a prescribed error is detected by the error detection means, the error information notification means notifies the operator of the error content information and error countermeasure information stored in the error information storage means.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008185855-A (JP)
Title: Fixing device and image forming apparatus equipped with the same
Inventor: MIYAKE HISAFUMI
IPC: G03G15/20
Filed: 2007-01-31
Abstract: <P>PROBLEM TO BE SOLVED: To prevent damages, such as breakages, wrinkles and cracks, and meandering of a fixing belt, and to prevent skew sheets, using a simple constitution.  <P>SOLUTION: The outer peripheral surface 50 of a fixing roller 36 is formed to a crown shape which is larger in the diameter Db of a central part 50b than the diameter Da of an end 50a. The fixing belt 40 is so formed that the thickness Ta of the end 40a is greater than the thickness Tb of the central part 40b. Twice the thickness difference T (=Ta-Tb) is made to exceed a crown amount D (=Db-Da), such that when the fixing belt 40 is stretched to the fixing roller 36, and an inverted crown shape recessed in a central part is formed on the surface 40d of the fixing belt 40.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008183351-A (JP)
Title: Game machine
Inventor: YAMAGUCHI MASAKI
IPC: A63F5/04
Filed: 2007-01-31
Abstract: <P>PROBLEM TO BE SOLVED: To provide a game machine capable of reducing the opportunity for a player to receive disadvantage without losing the player's eagerness for the play.  <P>SOLUTION: The slot machine includes a main control device 131 for integrally controlling the play. Signals are input to the main control device 131 from various sensors such as a start detecting sensor 71a, and the main control device drives/controls a stepping motor 61, etc. based on the input signals. The main control device 131 transmits various commands to a display control device 111 according to the progress of a game, and the display control device 111 drives/controls an auxiliary display part 15, etc. based on the received commands. The display control device 111 sets result announcing driving data to announce the result of a lottery for a winning combination when receiving a stopping operation command five times while a presentation flag is not set.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008192431-A (JP)
Title: High brightness surface light-emitting body
Inventor: HIRAISHI SHIGETOSHI
IPC: G02B5/08
Filed: 2007-02-02
Abstract: <P>PROBLEM TO BE SOLVED: To provide a surface light-emitting body that is superior in high brightness, brightness uniformity, and durability.  <P>SOLUTION: After an under-coating layer composed of an optically transparent resin is installed on one face of a light diffusing plate constituting the surface light-emitting body, a silver mirror covered-film is formed.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008193380-A (JP)
Title: Variable gain amplifier circuit, receiver, and ic for receiver
Inventor: OKASHIN YAMATO
IPC: H03G3/10
Filed: 2007-02-05
Abstract: <P>PROBLEM TO BE SOLVED: To provide a variable gain amplifier circuit which achieves the suppression of an increase in power consumption as much as possible, even in multi-stage connection, achieves low power consumption, and is effective for being formed into an IC.  <P>SOLUTION: The sources of MOSFETs 101, 102 are commonly connected to each other and a common connection point is connected to an electric current source 105. Input signals are supplied to gates of the MOSFETs 101, 102. Respective drains of the MOSFETs 101, 102 are used as one end and the other of an output end through the source-drain of MOSFETs 103, 104. Gain control voltages E2 are applied to the gates of the MOSFETs 103, 104 in common. The gain control voltage E2 performs control to raise bias voltages of the MOSFETs 101, 102 by control to reduce the gate voltages of the MOSFETs 103, 104.  <P>COPYRIGHT: (C)2008,JPO&INPIT
Patent JP-2008198253-A (JP)
Title: Optical pickup head and information recording/reproducing device equipped with the same, and information recording/reproducing method, program
Inventor: ETO DAISUKE
IPC: G11B7/135
Filed: 2007-02-08
Abstract: <P>PROBLEM TO BE SOLVED: To quickly and highly accurately discriminate a recording layer on which the converged beam of an optical pickup head is focused in recording/reproducing of a multilayer optical disk.  <P>SOLUTION: A diffraction optical element 3 divides a light from a light source 1 to generate optical beams corresponding to at least the number of information recording layers of an optical disk 7 so that the interval of optical beams in an optical axis direction is the same as the information recording layer interval of the optical disk 7, and light receiving components 12a and 12b individually receive the return lights of optical beams. Then, based on received light levels detected by the light receiving components 9, 12a and 12b, the information recording layer on which a main beam is focused is discriminated.  <P>COPYRIGHT: (C)2008,JPO&INPIT