baber/WOPTO huggingface dataset:
Patent KR-20000058088-A (KR)
Inventor: MAEKAWA TOSHIKAZ
IPC: H02M3/07
Filed: 2000-02-17
Abstract: PURPOSE: A power generating circuit, generating method therefor, and an LCD are provided to decrease a load of a set design by inserting a power generating circuit on an LCD panel and providing a power supply voltage generated in the power generating circuit to a driving circuit. CONSTITUTION: A pixel(11) is allocated as a two-dimensional matrix type, and composes a valid pixel region(12). The pixel(11) has a thin film transistor(13), a liquid crystal cell(14) connected to a drain electrode of the thin film transistor(13) at its pixel electrode, and an auxiliary capacity(15) connected to the drain electrode of the thin film transistor(13) at its one electrode. The thin film transistor(13) is connected to a gate line(scan line)(16) at its gate electrode, and is connected to a source line(signal line)(17) at its source electrode. An opposite electrode of the liquid crystal cell(14) and the other electrode of the auxiliary electrode(15) are connected to a common line(18) in which a common voltage is provided. A horizontal driver(19) is allocated on an upper side of a valid pixel region(12), and a vertical driver(scan line)(20) is allocated at a left side of the valid pixel region(12). A negative power generating circuit(22) provides a generated negative power supply voltage to the vertical driver(20).
Patent KR-20010083665-A (KR)
Inventor: KIM HO UK
IPC: H04Q9/00
Filed: 2000-02-17
Abstract: PURPOSE: A system for calling a remote controller is provided to easily identify a location of the relatively small size of remote controller by simply operating a signal tone. CONSTITUTION: A main body such as a TV and air-conditioner is provided with a frequency-transmitting device that is able to call a remote controller. The remote controller is provided with a frequency-receiving device. When the frequency transmitting device on the main body is pressed, the receiving device mounted on the remote controller is inputted the signal from the transmitting device, and generates a signal tone. Therefore, a user can easily identify the location of the remote controller.
Patent KR-20010081713-A (KR)
Inventor: LEE IN HO
IPC: G11B17/02
Filed: 2000-02-18
Abstract: PURPOSE: A disk driver is provided to prevent a signal recording surface from being contacted with other components in transferring a disk while reducing size of the disk driver. CONSTITUTION: A disk(D) is inserted to a case(100) for contacting to a guide roller(152) of an eject lever(150). Then, the disk is pulled by first and second holding rollers(140,145) for being fixed at a holder lever(130). A sensor(104) detects insertion of the disk for driving a loading motor(110). The driving force is transferred to a transfer plate(120) by passing through a worm gear(112), a connect gear(114), and a driving gear(116). The transfer plate is rotated for the holding lever to transfer with the disk. A rotation central shaft(145p) of the second holding roller is guided along a roller guide channel(109). Then, the holding lever is rotated about the rotation central shaft by 45 degrees. The disk is located on a turntable. Then, a guide pin(163) of a control lever(160) is transferred along the guide channel to rotate a control lever(160) about a rotating pin(161).
Patent KR-20010084721-A (KR)
Title: Methods of Lithography and Nanocrystalline Formation in situ by Using the Focused Ion Beam.
Inventor: CHOO DONG CHEOL
IPC: B82B3/00
Filed: 2000-02-28
Abstract: PURPOSE: An etching and nanocrystal forming technology development at the same positing using focused ion beam is provided to form nanoparticles having a size which is simple and effective compared with an existing technology as a technology using radiation effects of a focused ion beam in forming a nanocrystal required in manufacturing a next generation semiconductor device of single electron transistor or a quantum device. CONSTITUTION: In an etching and nanocrystal forming process at the same position, the etching and nanocrystal forming technology development at the same positing using focused ion beam is characterized in that ultra-fine structures are manufactured by direct etching using the focused ion beam, and simultaneously the nanocrystal is formed by superposition of defects that are shown by radiation effects of the focused ion beam.
Patent KR-20010087691-A (KR)
Title: multi-cyclone collector for vaccum cleaner
Inventor: AHN HYEOK SEONG
IPC: A47L9/16
Filed: 2000-03-08
Abstract: PURPOSE: A multi-cyclone dust collector for a vacuum cleaner is provided to reduce the pressure loss in the multi-cyclone dust collector for improving the dust collecting efficiency and prevent the leakage of odors generated by the collected substances and the continuous flowing of the substances. CONSTITUTION: A multi-cyclone dust collector for a vacuum cleaner includes at least one forward cyclone dust collecting unit(200) whose air suction direction and air discharge direction are approximately equal, wherein the forward cyclone dust collecting unit includes a main body(200a) disposed perpendicularly to a main body(100a) of a reverse cyclone dust collecting unit(100), a discharge hole(210) formed at a side of the main body to be communicated with a discharge hole of the reverse cyclone dust collecting unit, a discharge hole(220) formed axially at the other side of the main body, a dirt discharge hole(231) formed at the other side of the main body, and a dust collecting part(230) mounted to the dirt discharge hole beside the reverse cyclone dust collecting unit.
Patent KR-20010091590-A (KR)
Title: Method for controlling the power in a financial machine
Inventor: JUNG BYEONG SEON
IPC: G07F19/00
Filed: 2000-03-16
Abstract: PURPOSE: A method for controlling power of an ATM(Automated Teller Machine) is provided to improve dependence of a system by making the system error condition to minimum and to prevent many kinds of the safety accident in advance, which can be generated in maintaining and repairing. CONSTITUTION: In the method for controlling power of the ATM, a few stages are included. In the first stage, it is confirmed if the flag, which displays abnormal interception of the outer input power, is set up or not. In the second stage, if setting of the flag is confirmed, the ATM is initialized and the normal operation is carried out unconcerned with the on/off condition of a sub-power switch. In the third stage, if the power of the normal ATM is turned off, for example, the outer power is continuously input and the sub-power switch is turned off, the normal finishing progress is carried out and the power of the ATM is turned off.
Patent KR-20010094381-A (KR)
Title: Method of vacuum packaging using electrostatic bonding
Inventor: JU BYEONG GWON
IPC: H01L21/20
Filed: 2000-03-30
Abstract: PURPOSE: A vacuum mounting method is provided to maximize a vacuum efficiency of an inner of panels and to improve a permeation rate of a silicon substrate by using electrostatic bonding. CONSTITUTION: A contact medium(14) is deposited on a peripheral region of an FED(field emission device) of a cathode substrate(10b). A spacer(12) and the cathode substrate(10b) are electrostatically bonded by applying a desired voltage to the both ends of the spacer(12) and the cathode substrate(10b). An electrode and a contact medium are sequentially deposited on an anode substrate(10a). Then, the spacer(12) and the anode substrate(10a) are bonded by electrostatic bonding and by applying a desired voltage to both ends of the anode substrate(10a) and the spacer(12) bonded to the cathode substrate(10b).
Patent KR-20000037174-A (KR)
Inventor: PARK JONG UK
IPC: G06F17/00
Filed: 2000-04-06
Abstract: PURPOSE: A system and method for information exchange is provided for a user to acquire desired information when the user requests some information to a web server. CONSTITUTION: A system for information exchange is consisted of information requester(1), collection and classification of the requester's information(4), web server(5), information administrator(2), and information provider(3). Information requester applies for information inquiry. The administrator posts the requested information in web server after classification. An internet user can be an information provider if the user knows the requested information after contacting to the administrator's web server and searching the posted information. An information provider gives the needed information to the administrator or informs the administrator of the fact of possession of the information. The administrator transmits the method of communication with the provider to the requester. The administrator can receive information fee from the requester, and some of the fee can be given to the provider.
Patent KR-20000077040-A (KR)
Title: 반도체 박막을 결정화하는 방법 및 레이저 조사 시스템
IPC: H01L29/786
Filed: 2000-04-18
Abstract: 본 발명은 레이저빔으로 반도체 박막을 조사하여 기판 상에 미리 형성된 상기 반도체 박막을 결정화하는(crystallizing) 방법으로, 복수개의 분할 영역으로 상기 기판의 표면을 나누고, 상기 레이저빔의 조사 영역을 조정하도록 상기 레이저빔을 형상화하여 한 번의 레이저빔 조사에 의해 전체적으로 조사될 수 있도록 하는 준비 단계; 레이저빔의 세기를 광학적으로 조절하면서 상기 분할 영역 중 한 영역을 조사하여 주기적인 투광-차광 패턴(light-and-dark pattern)이 상기 조사 영역 상에 투사되고, 상기 패턴을 시프트 한 후 적어도 한 번 상기 동일한 분할 영역을 조사하여 시프트 한 후 패턴의 투광-차광부가 시프트 하기 전 패턴의 투광-차광부와 중첩되지 않도록 하는 결정화 단계; 및 레이저빔의 조사 영역을 다음 분할 영역으로 시프트하고, 상기 분할 영역에 대해 상기 결정화 단계를 반복하는 스캐닝 단계를 포함한다.
Patent KR-20010097067-A (KR)
Inventor: JUN JI WON
IPC: H04L12/16
Filed: 2000-04-19
Abstract: 본 발명은 온라인을 통한 영상 및 음성정보 제공장치 및 그 방법에 관한 것으로, 이용자가 통신단말기를 통해 정보제공사이트에 접속하여 제공받고자 하는 영상 및 음향정보의 종류와 품질을 선택하는 단계와, 상기 정보제공사이트가 상기와 같이 선택된 영상 및 음향정보의 종류와 품질에 따라 정보데이터베이스에 저장된 정보들을 검색하는 단계 및, 상기 정보제공사이트가 상기 이용자에 의해 선택된 품질에 적합한 영상 및 음향정보가 검색되면 상기 통신단말기로 제공하고, 상기 품질에 적합한 영상 및 음향정보가 검색되지 않으면 상기 품질로 가공하여 상기 통신단말기로 제공하는 단계를 포함하여 구성되어, 통신시간 및 통신비에 대한 이용자의 부담을 줄일 수 있는 효과가 있다.
Patent KR-20000077060-A (KR)
Title: 액정 패널의 이온 밀도 측정 방법 및 그 장치
IPC: G01N21/00
Filed: 2000-04-21
Abstract: 액정 표시 패널의 이온 밀도를 비파괴로 측정할 수 있도록 한다.  액정 표시 패널의 이온 밀도 분포를 파악할 수 있도록 한다. 
     1㎐ 정도의 낮은 주파수의 구형파를 인가하여 플리커를 관측한다(스텝 S303).  관측된 플리커의 진폭을 측정한다(스텝 S306).  미리 구해진 검량선(플리커의 진폭과 이온 밀도와의 상관 관계를 나타내는 선도)으로부터 액정 패널 내의 이온 밀도를 산출한다(스텝 S307).
Patent KR-20010098194-A (KR)
Inventor: SEO HEON
IPC: B62D25/10
Filed: 2000-04-28
Abstract: 본 발명은 백도어나 트렁크 후드의 초기 열림시 튀는 현상을 방지하여 편의성을 향상시킬 수 있는 자동차용 가스 댐퍼에 관한 것으로, 본 발명은 자동차의 백도어나 트렁크 후드에 설치되어 압축된 내부의 가스를 이용하여 백도어나 트렁크 후드의 개폐를 용이하도록 제공되는 자동차용 가스 댐퍼에 있어서, 내부에 가스가 충전되어 있으며, 내부에는 홈이 나선형으로 형성되어 있는 실린더; 상기 실린더 내부를 나선운동을 하면서 이동되도록 상기 홈에 일치하도록 외부에 가이드가 장착되며, 중앙부에서 이격된 부분은 가스가 통과할 수 있도록 관통된 유로가 형성되어 있는 피스톤; 상기 피스톤 앞쪽에는 상기 피스톤의 유로를 통해 이동된 가스를 조절하기 위해, 조정구가 형성되어 있는 유로 조정판; 및 상기 피스톤의 중앙에 부착되고, 유로 조정판을 관통하여 실린더 외부로 돌출 된 로드를 포함하는 것을 특징으로 한다.
Patent KR-20000054106-A (KR)
Inventor: HWANG KYUNG WOO
Filed: 2000-05-22
Abstract: PURPOSE: A network between on-line and off-line companies and system for a cooperative buy, sell, deliver, management, advertisement and payment are provided to collects many customer in an electronic commerce, and increase a sale and a satisfaction degree of a price and a quality of a product. CONSTITUTION: A union of small shopping mole companies is made and managed by a supervise company. The supervise company makes a contract with a fabrication company and gives a cooperative order to the fabrication company. The supervise company has a program for the cooperative deliver, payment and management, and a database. The supervise company selects a deliver company for managing the deliver. A member of the union can check the proceeding of the order via an automatic database processing system of the supervise company, and confirm the delivery via a delivery tracking system.
Patent KR-20000054129-A (KR)
Inventor: JEONG KYUN RYANG
Filed: 2000-05-23
Abstract: PURPOSE: A studying book education business model through an educational institution franchise is provided to replace extracurricular pay classes. CONSTITUTION: Parents teachers(330) are trained through an educational course of a franchise educational institution(350), by employing studying books. Thereafter, the parents teachers(300) teach their children. Accordingly, it compensates for the public education and replaces the private education. As a result, expenses for the private education are reduced, and a preferable educational system replacing extracurricular pay classes is embodied.
Patent KR-20000077413-A (KR)
Title: 이동 통신 시스템
IPC: H04B7/10
Filed: 2000-05-25
Abstract: 섹터수가 증가하거나 안테나 빔 폭이 증가하는 경우에서도 핸드오프의 회수가 증가하는 것을 방지하기 위해, 이동 통신 시스템은, 이동국이 이동하여 그 이동국으로부터의 수신 품질이 최대인 빔이 변경되더라도, 확산 코드를 변경하지 않고 전송 동작을 계속한다.
Patent KR-20010108603-A (KR)
Title: 이중 증발기 구조를 가진 에어컨장치
Filed: 2000-05-30
Abstract: 본 발명은 전후방 이중의 증발기를 구비한 차량용 에어컨 시스템에 있어서, 상기 에어컨의 압축기를 가변용량식으로 구비하고 상기 전후방증발기에는 냉매제어용 마그네트밸브를 연결설치하며 이를 후방증발기에 설치되는 증발기 토출온도 감지용 센서와 연결시켜 상기 전후방증발기들을 개별적으로 제어할 수 있도록 하므로써 상기 후방증발기로의 냉매 과잉공급에 따른 동결현상을 방지하고 상기 증발기들의 제어를 원활하게 할 수 있도록 한 이중 증발기 구조를 가진 에어컨장치에 관한 것이다. 
     본 발명은 하나의 압축기(1)에 서브콘덴서(2)와 메인콘덴서(3)를 구비하고 이 메인콘덴서(3)에는 1개의 리시버 드라이어(4)를 연결하고 이 리시버 드라이어(4)에는 2개의 전후방증발기(5)(6)를 각각 연결시켜 냉매회로를 구성한 것에 있어서, 상기 압축기(1)를 가변성 용량을 가지도록 구비하고 상기 전방증발기(5)에는 증발기밸브(7)를 설치하며 상기 전후방증발기(5)(6)들의 관로상에는 각각의 마그네트밸브(8)(9)를 설치하고, 상기 각 증발기(5)(6)들에는 상기 마그네트밸브(8)(9)들을 구동시키기 위한 토출온도 감지용 센서(10)(11)를 설치하도록 구성된 것이다.
Patent KR-20010111611-A (KR)
Inventor: LEE SEUNG HU
Filed: 2000-06-12
Abstract: 본 발명은 전용망 구성시 국간 신호방식을 자동으로 감지하고 할당할 수 있도록 한 교환시스템에서 상대국의 신호방식을 감지하여 인터페이스하는 장치를 제공하기 위한 것으로, 이러한 본 발명은, 전송선로의 임피던스에 정합하도록 내부 임피던스를 조정하고 전송선로를 통한 신호교환을 수행하는 임피던스 정합부와; 상기 임피던스 정합부가 전송선로를 통해 수신하는 신호의 선로부호화 방식을 감지하여 상기 전송된 신호를 인터페이스하는 라인 디코더부와; 상기 라인 디코더부에서 인터페이스된 신호를 프레임 변환하는 프레임 연동부와; 상기 프레임 연동부에서 프레임 변환된 신호를 입력받아 상대국의 신호방식을 감지하는 신호방식 감지블록과; 상기 라인 디코더부에서 출력되는 신호방식 정보를 중앙처리부로 전송하는 메모리 엑세스부와; 상기 신호방식 감지블록에서 감지된 각 신호방식에 대한 정보를 입력받고, 상기 감지된 각 신호방식에 따라 상대국으로 전송할 선로부호를 생성하도록 상기 프레임 연동부를 제어하는 중앙처리부로 구성되어, 자국과 대국의 신호방식이 다른 경우에도 하드웨어 변경없이 자국의 선로부호화 방식 및 전송방식을 상대국 교환시스템과 연동시킬 수 있게 된다.
Patent KR-20010007391-A (KR)
Title: Optimized synchronization preamble structure
Inventor: BOEHNKE RALF
IPC: H04L27/26
Filed: 2000-06-15
Abstract: PURPOSE: An optimized synchronization preamble structure is provided to optimize the time domain signal characteristic of an A field and a receiver synchronization characteristic based on an automatically correlation. CONSTITUTION: A time domain signal of an A field of a preamble for synchronization in an OFDM(orthogonal frequency division multiplexing) transmitting system is generated by performing inverse fast Fourier transform of a frequency domain string SA composed of twelve complex symbols mapped by inverse fast Fourier transform of 64 points based on a mapping rule S-26, 26 = sqrt(2)*(0, 0, 0, 0, S1, 0, 0, 0, S2, 0, 0, 0, S3, 0, 0, 0, S4, 0, 0, 0, S5, 0, 0, 0, S6, 0, 0, 0, S7, 0, 0, 0, S8, 0, 0, 0, S9, 0, 0, 0, S10, 0, 0, 0, S11, 0, 0, 0, S12, 0, 0, 0, 0). The frequency domain string SA of the A field is represented by, for instance, S1,...S12=+A, +A, +A, +A, +A, -A, -A, +A, +A, -A, +A, -A or S1,...S12=-A, +A, -A, +A, +A, -A, -A, +A, +A, +A, +A, +A.
Patent KR-20010049559-A (KR)
Inventor: DEVRIES KEITH MICHAEL
IPC: C07C229/34
Filed: 2000-06-16
Abstract: PURPOSE: Provided is a novel manufacturing method of 3(S)-((5-chloro-1H-indole-2-carbonyl)- amino)-2(R)-hydroxy-4-phenyl-butyric acid at a low cost by reacting two specific kinds of compounds and extracting with an organic solvent, thereby producing indole-2-carboxamide and its derivative which have an inhibition effect on glycogen phosphorylase and useful for the treatment glycogen phosphorylase related diseases. CONSTITUTION: The compound of formula(6) is produced by: reacting a compound of formula(5) in an aprotic solvent A in the presence of a catalytic solvent and an activation agent in an inert gas atmosphere to obtain a compound of formula(2); separately reacting a compound of formula(3) in the presence of a base, etc. in a liquid mixture of an aprotic solvent B and a protonic solvent at about pH 8-13 at the refluxing temperature to obtain a compound of formula(4); mixing a solution of the compound of formula(2) with a solution of the compound of formula(4) in an inert gas atmosphere while keeping the temperature; cooling the product to room temperature to obtain a compound of formula(5); separating the water layer A and the organic layer A; treating the organic layer A with an aqueous solution of an acid or the aqueous solution and H2O; separating the water layer B from the organic layer B; keeping the organic layer B; and extracting the objective compound of formula(6) to the organic solvent.
Patent KR-20010015052-A (KR)
Inventor: MIZUSAWA AKIRA
IPC: E05D15/16
Filed: 2000-06-22
Abstract: PURPOSE: To provide a structure capable of easily and surely connecting an elevating/lowering window glass of an automobile to an elevating/lowering member to constitute a window regulator on a glass holder without using any adhesive. CONSTITUTION: A glass bolder G comprises a holding part 2 to hold an end part of an elevating/lowering window glass 200 and a fitting part 1 of a window regulator to a direction member 302. The holding part 2 comprises an inner molded part formed of a hot melt material provided with a pair of side members 20a, 20a to hold the end parts of the window glass 200 from both sides and a bottom member 20b stretched between lower ends of a pair of the side members 20a, 20a, and an outer molded part formed of a plastic material higher in melting point than the hot melt material integrated with the inner molded part 20 outside the inner molded part 20.
Patent KR-20010015059-A (KR)
Inventor: YOSHIMURA MASAYUKI
IPC: H02K15/03
Filed: 2000-06-23
Abstract: PURPOSE: A device is provided to form uniform plating films on both outside surface and inside surface of a material to be plated which has a hollow part communicating with outside by providing the hollow part of the material to be plated with an anode to be inserted and arranged therein, rotating the material to be plated around its central axis and supplying plating current to the material to be plated. CONSTITUTION: The anode to be inserted and arranged in the hollow part of the material to be plated is a rod form having a circular shape in section and is inserted and arranged into the hollow part in such a manner that its central axis direction parallels to the central axis direction of the material to be plated and preferably exists on the central axis of the material to be plated. The material to be plated is rotated around its central axis and the member for supplying the plating current to the material to be plated is a metallic drive roller. This drive roller itself is rotated around its central axis by means of a motor and a belt, by which the material to be plated is rotated round its central axis and is connected to the cathode side of a current rectifier to supply the plating current to the material to be plated.
Patent KR-20020001412-A (KR)
Title: Method for providing secured web-mail service based on public key, and system for the same
Inventor: NOH YUN HO
Filed: 2000-06-28
Abstract: PURPOSE: A security web mail service method based on a public key and a system for the method are provided to guarantee a moving property and a security of a mail based on a PKI(Public Key Infrastructure). CONSTITUTION: A mail user creates a public key and a private key through a downloaded security web mail control module(S10). The mail user prepares a requesting message including an electronic authentication certificate registering request for registering the created public key and a private key in a certification server and a key trust request for a trust storage of a private key and/or a cryptograph sentence(S20). In case that the mail user requests only an electronic authentication certificate registration using a requesting message, the certification server signs the public key transmitted from the mail user using one's password key and creates an electronic authentication certificate and stores the certificate(S30,S60). The mail user codes a private key using a cryptograph sentence and stores the codes sentence and coded one's private key in a storing place as a diskette or a key managing database in a user computer(S70,S80).
Patent KR-20020002724-A (KR)
Title: Method of manufacturing a high dielectric capacitor
Inventor: NOH JAE SEONG
IPC: H01L27/105
Filed: 2000-06-30
Abstract: PURPOSE: A method for fabricating a capacitor of a high density dielectric is provided to prevent reduction of capacitance due to oxidation of a barrier metal by forming a hole on a silicon layer formed on a polysilicon plug of a contact hole and a lower electrode on a sidewall of a barrier metal layer formed within the hole. CONSTITUTION: An insulating layer(3) and an anti-reflective layer(4) are formed on a semiconductor substrate(1). A contact hole is formed by patterning the anti-reflective layer(4) and the insulating layer(3). A plug(5) is formed within the contact hole. A silicon layer is grown on the plug(5). An oxide layer is formed on the whole surface of the structure. The silicon layer is exposed by flattening a surface of the oxide layer. A hole is formed on the oxide layer by removing the silicon layer. A titanium silicide layer(8) is formed on the plug(5). A barrier metal layer(9) is buried into the hole. The oxide layer is removed. A lower electrode(10) is formed on sidewalls of the titanium silicide layer(8) and the barrier metal layer(9). A dielectric layer(11) is formed on the whole surface of the structure. An upper electrode(12) is formed on the dielectric layer.
Patent KR-20010021046-A (KR)
Title: Hoisting device for an elevator
Inventor: MIYOSHI HIROYUKI
IPC: B66D1/22
Filed: 2000-07-03
Abstract: PURPOSE: Disclosed is an elevator hoisting machine by providing a braking means housed in the radial inside of a cylindrical drive motor to impart a braking force to the drive motor, and setting a speed reducer for reducing and outputting the rotation of the drive motor to a sheave closely on one side of the drive motor and the braking means. CONSTITUTION: A braking means(27) for imparting a braking force to a permanent magnet(22) that is the rotation part of a drive motor(23) is housed between a substantially cylindrical intermediate member(26) spline-connected to multiple ends of an input shaft(21) and the drive motor(23) or in the radial inside of the drive motor(23) through the intermediate member(26), the input shaft(21) and a rotator(19). When the braking means(27) is housed in the radial inside of the cylindrical drive motor(23), the drive motor(23) is radially superposed on the braking means(27), a hoisting machine(11) is shortened by the axial length portion of the braking means(27) and thinned. Further, when a center crank type speed reducer(20) is adapted, the coaxial arrangement of the speed reducer(20) and the drive motor(23) can be facilitated.
Patent KR-20010015231-A (KR)
Inventor: YUMA YOSHITO
IPC: G11B7/13
Filed: 2000-07-07
Abstract: PURPOSE: To detect tracking error signals, for example by a three-beam method by coping with two kinds of optical disks different in using laser beam wavelength and comparatively freely selecting the arrangement of the light receiving part of a photodetector. CONSTITUTION: The plural light receiving parts A, B, E, F of a photodetector IC 25 are disposed on the extension of a line connecting the point p1 where the main beam of the first laser beam, which is emitted from a double wavelength semiconductor laser element 24, passes through the opening 23 of a package member 21 and the point p2 where the main beam of the second laser beam from the same element 24 passes through the same opening 23, at the time when the integrated optical device 11 is projected on a plane. As a result, the arrangement of other light receiving parts C, D can comparatively freely be selected.