baber/WOPTO huggingface dataset:
Patent KR-20020040257-A (KR)
Title: Electromagnetic Acoustic Transducer for Weld Inspection of Cold Rolled Strip
Inventor: KANG MYEONG GU
IPC: B21B38/00
Filed: 2000-11-24
Abstract: PURPOSE: An electromagnetic acoustic transducer for inspecting the welding part of a cold rolled strip is provided in which generation of supersonic waves has more efficient and constant internal characteristics by composing a transmitter as single layered printing circuit boards and a receptor as multilayered printing circuit boards. CONSTITUTION: In an electromagnetic acoustic transducer comprising a permanent magnet producing a bias magnetic field at an object to be measured, transmitter in which coils are arranged, and which generates ultrasonic waves by flowing a high frequency current of a high voltage, and a receptor in which coils are arranged, and which receives he ultrasonic waves generated from the transmitter according to the conditions of the welding part of the object to be measured, the electromagnetic acoustic transducer is characterized in that the transmitter is consisted of single layered printing circuit boards in which the coils are arranged to have a low resistance so that the transmitter is used in a high voltage, the receptor is consisted of multilayered printing circuit boards in which the coils are arranged to have a high impedance so that the receptor measures even a tiny variation of fine voltage, the coils respectively arranged on the printing circuit boards of the transmitter are consisted of one input coil(11) and one output coil(33) each of which are connected, and the coils are arranged in the same pattern so that all current directions of the printing circuit boards of the receptor are conformable with each other.
Patent KR-20020041999-A (KR)
Title: Moveble installation system for wall television set
Inventor: LEE MAN TAEK
IPC: H04N5/655
Filed: 2000-11-29
Abstract: PURPOSE: An installation system moving a TV hanging on the wall is provided to lift up and down the TV along a guide rail by driving a power transmission device, thereby controlling a position of the TV according to a watching position of a viewer. CONSTITUTION: A lifting unit(10) has a rack gear(11). The rack gear is installed in a straight line along a ceiling and a wall(2) on the center of a TV(1). The rack gear has a constant radius not to interfere with one end of the TV, and is installed on a bracket(12) fixed on the wall by a moving direction of the TV. A guide unit(20) has a guide rail(21) shaped as a square without one line. The guide rail is fixed on many brackets(22). The brackets are installed on the wall and the ceiling at regular intervals, to be located side by side on both sides of the rack gear. On a back side of the TV, an external flange(21a) is inserted between one pair of guide rollers(23a, 23b). The guide rollers are fixed on both sides of a roller bracket(24), respectively.
Patent KR-20020043945-A (KR)
Title: Polymer electrolyte filled with titania nanoparticles and the preparation thereof
Inventor: JANG SUN HO
IPC: B82Y99/00
Filed: 2000-12-05
Abstract: PURPOSE: Provided are a polyelectrolyte filled with titania having size of nanometer, having high ion conductivity and low interfacial resistance, and a method for producing the same. CONSTITUTION: The polyelectrolyte is produced by the steps of (i) dissolving a copolymer of vinylidene fluoride and hexafluoropropylene, and titania particles of nanometer size in solvent, so as to form a polymer film; and (ii) impregnating the polymer film with electrolyte solution. The solvent is acetone or tetrahydrofuran. The electrolyte solution is a mixture of lithium salt and an organic solvent. The lithium salt is at least one selected from the group consisting of LiClO4, LiBF4, LiAsF6, LiCF3SO3 and LiN(CF3SO2)2. The organic solvent is selected from the group consisting of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, and mixture thereof.
Patent KR-20020044818-A (KR)
Title: Ammonai Nitrogen Eliminating Device Using Jolite and Thereof Method
Inventor: CHOI IN SEON
IPC: C02F9/02
Filed: 2000-12-06
Abstract: PURPOSE: An apparatus for removing ammonia nitrogen using zeolite and method thereof are provided. Floc of wastewater is settled in settling tank, and ammonia nitrogen is filtered in zeolite tank. Ammonia nitrogen adsorption and zeolite recycling are operated at the same time. Zeolite is recycled using back-washing water, and ammonia nitrogen of recycled water is removed by air stripping. NaOH is supplied during back-washing for improving separation of ammonia nitrogen from zeolite. CONSTITUTION: The apparatus comprises the following parts: a tank for collecting wastewater; a mixing tank for injecting and mixing coagulants; a flocculation tank; a tank for settling generated floc; a tank, for removing ammonia nitrogen, packed with zeolite; a device for back-washing zeolite; and a device for ammonia stripping.
Patent KR-20020045949-A (KR)
Title: A check valve
Inventor: CHOI MIN CHEOL
IPC: F16K15/00
Filed: 2000-12-12
Abstract: PURPOSE: A check valve is provided to prevent leakage generated by foreign material arranged between packings and to improve closing force by installing an elastic wing. CONSTITUTION: A check valve comprises a back plate(100) fixed on a specific portion of a pipe of a connecting valve(A); a spring elastically supported by the back plate; a circular guide groove(110) formed on a middle upper portion of the back plate; a fluid flowing passage(120) mounted on the back plate; a space unit(211) arranged on the circular guide groove; a guide bar(210) formed on a side portion of a transferor(200); a head unit(220) integrally formed on the other portion of the transferor; a fixing groove(221) mounted on the head unit; a guide wing(230) installed between the guide bar and the head unit; a packing(300) opening or closing a conduit; an insert groove(320) mounted corresponding to the head unit and fixing groove with a fixing protrusion(321); and an elastic wing(310) formed on the packing.
Patent KR-20020046867-A (KR)
Title: System and method for controlling a traffic of a network
Inventor: PARK U YEONG
IPC: H04L12/28
Filed: 2000-12-15
Abstract: PURPOSE: A network traffic control system and method is provided to prevent terminals having a "connection condition" from being cut off on a network together with terminals having a "cut-off filtering condition" at once by applying a VLAN(Virtual Local Area Network) adoption method for the network traffic control of an arbitrary terminal. CONSTITUTION: A network traffic control system consists of a switch block(30) and a control block(20). The switch block(30) executes switching for network frames sent from arbitrary terminals(50). The switch block(30) is composed of the first VLAN(31), the second VLAN(32), and a null VLAN(33). A series of broadcast domains are normally allocated to the first VLAN(31) and the second VLAN(32). The null VLAN(33) is an abnormal VLAN to which such broadcast domains are not allocated. The control block(20) controls the switching state of the switch block(30) in a software way. The control block(20) is composed of a MAC(Media Access Control) address filtering table(21) and a membership control module(22). The MAC address filtering table(21) stores the MAC address and network filtering condition of each terminal(50). The membership control module(22) precisely controls the network traffic of each terminal(50) while communicating with the MAC address filtering table(21).
Patent KR-20020049120-A (KR)
Title: Variable steering system for use in an automobile
Inventor: SONG JUN GYU
IPC: B62D1/18
Filed: 2000-12-19
Abstract: PURPOSE: A variable steering system for a vehicle is provided to obtain the steering angle of front wheels to the utmost and to reduce radius of gyration of a vehicle with using the surplus space of the wheelhouse. CONSTITUTION: A variable steering system for a vehicle is equipped with a sun gear(12) installed to a steering shaft, plural planetary gears(15) having outer gearing with the sun gear, a ring gear(16) having inner gearing with the planetary gears, a carrier(13) supporting the planetary gears and forming a protrusion(14) to a side, a stopper(17) selectively contacted with the protrusion and controlling the movement of the carrier, and a driving unit(20) moving the stopper back and forth. The steering angle of the front wheels is obtained to the utmost and the radius of gyration of the vehicle is reduced by making the rotation of a steering shaft variably controlled depending on the installing of a chain.
Patent KR-20010067474-A (KR)
Inventor: ANDO YUJI
IPC: H01L29/812
Filed: 2000-12-20
Abstract: PURPOSE: To provide a field effect transistor with epitaxial structure for maintaining the large maximum drain current or a low ON resistance, reducing a gate leakage current in gate forward biasing, and increasing a gate forward rising voltage. CONSTITUTION: An undoped Al0.5Ga0.5As barrier layer 106 with a film thickness of 3-10 nm is arranged between an undoped In0.2Ga0.8As channel layer 105 and an Si-doped Al0.2Ga0.8As upper electron supply layer 107, thus forming a potential barrier directly above a channel. Although the height of the Schottky barrier being formed by the contact with a gate electrode becomes low in the forward gate biasing, the height of the potential barrier being formed directly above the channel does not seldom change, thus acting as a barrier effectively for electrons in the channel, effectively reducing a gate current when a gate forward voltage is large, and increasing a gate forward rising voltage.
Patent KR-20020052782-A (KR)
Title: outside case of mobile communication system to application heat pipe
Inventor: CHOI BYEONG HYEOK
IPC: H04Q1/02
Filed: 2000-12-26
Abstract: PURPOSE: An outdoor case containing a heat pipe in a mobile system is provided to suppress an error in operation and the generation of a fault by discharging the heat generated from a plate to the external through a heat pipe. CONSTITUTION: In an outdoor exchange fixed to the supporting bar(21) of a support member(20), an outdoor case is composed of a case(50), a fixing member, and a cooling member. The case(50), attached to the supporting bar(21), accepts a plate, to which a circuit component is attached. The fixing member fixes the supporting bar(21) and the case(50). The cooling member discharges the heat generated from the circuit component to the external. The case(50) is composed of the first body, the second body, screws, and fixing holes. The first body, comprising a supporting chip, is hinged with the first door(511). The second body, accepting the plate, is hinged with the second door(521). The screws fix the plate, mounted on the first body, and the second body. The fixing holes fix the first and second doors(511,521) to the first and second bodies.
Patent KR-20020054980-A (KR)
Title: Structure for mounting ool level gauge of automobile
Inventor: KIM JONG WON
IPC: F01M11/12
Filed: 2000-12-28
Abstract: PURPOSE: An oil level gauge is mounted in the left side of an automobile stably to check oil easily. CONSTITUTION: A guide pipe(22) is installed in the air intake portion of engine inserted with an oil level gauge. A fixing member is installed to fix one end of the guide pipe in upper end of the car frame(5). The fixing member comprises a bracket(24) fixed by a bolt and a clip(25) in the upper end of the bracket to fix the guide pipe.
Patent KR-20020055067-A (KR)
Title: A service providing system using ETC terminal
Inventor: LEE JIN YONG
IPC: H04W12/06
Filed: 2000-12-28
Abstract: PURPOSE: Provided is a device for providing by using electronic toll collection terminal, which enables driver to conveniently receive various services in car. CONSTITUTION: The device comprises an electronic toll collection terminal(20) installed in car; a main server connected to the electronic toll collection terminal(20) through wireless communication network(40) outside the car; a credit card(10) which incorporates integrated circuit(IC) chip for electronic toll collection so as to cover the amount by the terminal(20). The device provides a service that the main server requests to the terminal(20) through the wireless communication network(40), and simultaneously covers a service charge by using number of credit card transmitted from the terminal(20) through the network(40).
Patent KR-20020058494-A (KR)
Title: Image sensor having potential well under charge transport part
Inventor: PARK CHAN
IPC: H01L27/146
Filed: 2000-12-30
Abstract: PURPOSE: An image sensor is provided to prevent a generated electric charge except for a photodiode electric charge from being moved to an electric charge transfer part by forming a potential well at the lower portion of the electric charge transfer part. CONSTITUTION: An image sensor comprises a p-type semiconductor substrate(30), a p-type epitaxial layer(31) formed on the p-type semiconductor substrate(30), a photodiode(32) isolated by isolation layers formed in the p-type epitaxial layer(31), a channel stop layer(33) formed on the photodiode(32) in the p-type epitaxial layer(31), an electric charge transfer part(34) having a defined interval with the photodiode(32) formed in the p-type epitaxial layer(31), a gate electrode(35) formed on the p-type epitaxial layer(31), and a potential well(100) having a low voltage level formed under the electric charge transfer part(34) in the p-type epitaxial layer(31).
Patent KR-20010030909-A (KR)
Title: 개선된 기능을 갖는 센서
IPC: G01B11/24
Filed: 1999-08-03
Abstract: 단일 하우징 센서(100, 300)는 광원으로부터 광선(52)을 수신하는 검출기(54, 324)를 상기 하우징 내에 구비한다.  상기 하우징 내에 있는 검출기(54, 324)는 픽 앤 플레이스 장치(102)의 노즐(202, 314, 316, 318, 320) 상에 회전할 수 있도록 장착된 부품(200, 306, 308, 310, 312)의 프로파일을 나타내는 출력을 제공한다.  또한, 상기 센서(100, 300)는 픽 앤 플레이스 장치 내에 있는 엔코더(134, 136, 138, 140)에 연결된 수신 회로(222)를 상기 하우징 내에 구비하며, 상기 엔코더(134, 136, 138, 140)는 노즐(202)의 회전 위치를 나타내는 출력을 상기 센서(100, 300)에 제공한다.  상기 센서(100, 300) 내에 있는 계산 회로(236)는 부품(200, 306, 308, 310, 312)의 픽업 오프셋 및 방위 각을 나타내는 보정 신호를 계산한다.  상기 보정 신호는 모터 엔코더 데이타 및 부품 섀도우의 여러 이미지로부터 계산되며, 각각의 이미지는 노즐(202, 314, 316, 318, 320)의 회전각 θ 에서 수집된다.  UART(238)는 상기 보정 신호를 픽 앤 플레이스 장치에게 직렬로 보내는데, 이는 부품(200, 306, 308, 310, 312)을 인쇄 회로 기판 상에 정확히 배치하는데 사용된다.
Patent KR-20010031820-A (KR)
Title: 액상 시료로부터 입자 물질을 혼합 및 분리하기 위한 방법및 장치
IPC: G01N1/10
Filed: 1998-11-04
Abstract: 유체로부터 입자 물질을 분리하기 위한 본 발명의 장치는 수집 용기, 하우징 내에 위치하며 수집 영역 상의 액체내 입자 물질을 수집하기에 적합한 다공성 배열 및 펌프를 포함한다. 본 발명의 장치는 생물학적 유체로부터 세포를 단층으로 수집하는데 사용되며, 특히, 세포학용으로 유용하다.
Patent KR-20010032098-A (KR)
IPC: G06F3/039
Filed: 1998-11-12
Abstract: 본 발명은 제한된 스트림라인형 액세스를 컴퓨터용화된 정보 소스에 제공하는 시스템에 관한 것이다.  이 시스템은 사용자 입력(500)을 수신하기 위한 장치를 갖는 마우스 패드(100)와 같은 광고 전용 도구 등의 별도의 부품을 구비하고, 다목적 컴퓨터에 결합되어 동작하며, 다시, 이 입력을 근거하여 독창적인 소정의 신호를 발생시킨다.  이 시스템은 소프트웨어내에서 선택되어 저장되는 바와 같이, 하나 이상의 커맨드(103ag)를 실행하여 각각의 독창적인 소정의 신호에 응답하도록 컴퓨터를 구성하는 소프트웨어를 더 구비한다.  각각의 구성은 동적으로 잠겨질 수 있어, 독창적인 입력에 대해 실행될 커맨드는 패스워드와 같은 허가 기구없이는 변경할 수 없다.  또한, 이 소프트웨어는 수신된 신호에 관련된 커맨드를 실행하여 독창적인 소정의 신호 중 하나를 수신하도록 응답한다.  또한, 상기와 같은 동작을 수행하는 방법이 개시되어 있다.  광고에 있어서, 이 시스템 및 방법은 인터넷상의 비지니스, 인터넷 콘텐츠 프로바이더의 도메인내의 다양한 위치에 용이하게 액세스하여, 컴퓨터 네트워크를 관리하는 특정 어플리케이션에 관련된다.
Patent KR-20010032865-A (KR)
Title: 전기회로를 포함하는 기기와 관련된 장치 및 방법
IPC: H04M1/02
Filed: 1998-12-11
Abstract: 휴대 장치(105)에 있는 덮개(100) 및, 덮개(100)를 가진 휴대 장치(150)가 도시되어 있는데, 상기 휴대 장치(150)는 장치 하우징(152) 내에 전기적인 장치 회로(151)를 포함한다. 상기 덮개(100)는 전기적인 덮개 회로(101)와 기계적인 덮개 접속 수단(103)을 포함하는데, 상기 기계적인 접속 수단(103)은 하우징(152) 외부에서 접근할 수 있는 장치의 기계적인 장치 접속 수단(153)에 기계적인 접속 및 단절을 가능하게 한다. 상기 덮개(100)는, 하우징(152) 외부에서 접근할 수 있는 장치(150)의 전기적인 장치 접속 수단(154)에 전기적인 접속 및 단절을 가능하게 하는 전기적인 덮개 접속 수단(102)을 더 포함한다. 상기 전기적인 덮개 회로(101)는, 전기적인 덮개 접속 수단(102)에서 감지되는 바와 같은 소정의 교정값으로 전기적인 덮개 회로(101)를 교정할 수 있는 전기적인 교정 수단(104)을 포함한다.
Patent KR-20010041729-A (KR)
IPC: A61F13/15
Filed: 1999-03-11
Abstract: 본 발명의 일회용 의복은 웨이스트 개구부 및 한쌍의 레그 개구부를 규정하는 팬티 본체를 구비한다.  팬티 본체는 정면 섹션, 배면 섹션 및 가랑이 섹션을 포함한다.  팬티 본체는 정면 섹션내의 정면 웨이스트테두리 섹션과 배면 섹션내의 배면 웨이스트테두리 섹션을 구비하는 연속적인 웨이스트테두리를 포함한다.  정면 웨이스트테두리 섹션은 길이 치수를 갖고 있고, 배면 웨이스트테두리 섹션은 길이 치수를 갖고 있다.  탄성 웨이스트밴드는 정면 웨이스트테두리 섹션에 결합된 정면 웨이스트밴드 부분과, 배면 웨이스트테두리 섹션에 결합된 배면 웨이스트밴드 부분을 포함한다.  정면 웨이스트밴드 부분은 길이 치수를 갖고 있고, 배면 웨이스트밴드 부분은 길이 치수를 갖고 있다.  탄성 웨이스트밴드 부분중 적어도 하나는 탄성 웨이스트 부분이 결합되는 각 웨이스트테두리 섹션의 길이 치수보다 큰 길이 치수를 갖고 있다.
Patent KR-20010034648-A (KR)
Title: 삼옥심에테르 유도체 및 추가의 살진균제 기재의 살진균성혼합물
IPC: A01N37/34
Filed: 1999-03-22
Abstract: 본 발명은 활성 성분으로서 a) 하기 화학식 I (식 중, 치환체 및 지수는 발명의 상세한 설명에 언급된 의미를 가짐)의 페닐아세트산 유도체 및 그의 염및 b) 하기 화학식 II 내지 화학식 V의 화합물 중 1 종 이상을 상승작용 유효량으로 포함하는 살진균제 혼합물에 관한 것이다. 
     ＜화학식 I＞ 
     
       
     
     ＜화학식 II＞ 
     
       
     
     ＜화학식 III＞ 
     
       
     
     ＜화학식 IV＞ 
     
       
     
     ＜화학식 V＞ 
     
       
     
     상기 식들에서, 치환기들은 각각 본원에 정의된 바와 같다.
Patent KR-20010043382-A (KR)
Title: 실리콘 시트 및 이를 이용한 외과용 붕대
IPC: B32B25/20
Filed: 1999-05-13
Abstract: 본 발명은 실리콘 겔층과 실리콘 엘라스토머층이 연속적으로 다른 상 구조를 갖도록 일체로 형성되어 있는 것을 특징으로 하는 실리콘 시트 이를 이용한 외과용 붕대 및 그의 제조법에 관한 것이다. 
     이 붕대는 환부에의 접착성, 보호성 및 정합성이 우수하며, 또한 전체로서의 물리적 강도가 우수하여 효율 좋게 이를 제조할 수 있고, 취급작업성이 매우 우수하여 외과용 붕대로서 유용하다.
Patent KR-20020057573-A (KR)
Title: Scanning photolithography method for having uniform critical dimension
Inventor: CHO HAN GU
IPC: G03F7/20
Filed: 2001-01-05
Abstract: PURPOSE: Provided is a scanning exposure method for giving a uniform critical dimension(CD) in the whole scanning zone by increasing or reducing a scanning velocity. CONSTITUTION: The scanning exposure method for giving the uniform critical dimension is performed by increasing the scanning velocity and reducing the on/off frequency of a light source in the scanning zone having a relatively small critical dimension and by reducing the scanning velocity and increasing the on/off frequency of the light source in the scanning zone having a relatively large critical dimension.
Patent KR-20010076301-A (KR)
Title: Structure and manufacturing method of semiconductor device having uneven surface at memory cell capacitor part
Inventor: HIKASHINO TOMOHIKO
IPC: H01L21/8242
Filed: 2001-01-17
Abstract: PURPOSE: To provide a manufacturing method of a semiconductor device composed of 1T1C wherein unevenness is formed on a surface of a memory cell capacity part in order to increase a surface area, while a photolithography process is not added for that purpose so as to take the manufacturing efficiency of the semiconductor device into account. CONSTITUTION: Parts of an oxide film 5 and parts of a conductor layer 4 under the parts of the oxide film 5 are removed, while the bottom parts of the conductor layer 4 are left with different widths to form spaces C and B. An oxide film 7 is formed over the whole surface so as to fill the spaces C, and side wall etching back is practiced to selectively form parts where the conductor layer 4 is exposed. The conductor layer 4 is etched from the exposed parts.
Patent KR-20010076353-A (KR)
Title: Optical monitoring in a two-step chemical mechanical polishing process
Inventor: ADAMS BRETT W
IPC: H01L21/304
Filed: 2001-01-18
Abstract: PURPOSE: An optical monitoring method in a two-step chemical mechanical polishing(CMP) process is provided to precisely detect an end point of a CMP process even if only a planarization is performed, a lower layer is over-polished, or the lower layer and an upper layer have similar physical properties. CONSTITUTION: A substrate(10) includes the first layer and the second layer disposed under the first layer such that the first and second layers have different reflectivity. A CMP process is performed regarding the first layer by using the first polishing fluid. The substrate is optically monitored during a process using the first polishing fluid so that a plurality of intensity trace values including respective intensity measurement values in a different radius scope are generated. If one of the intensity trace values shows an initial clearance of the first layer, a CMP process is performed regarding the substrate by using the second polishing fluid having a polishing characteristic different from that of the first polishing fluid. The substrate is continuously and optically monitored during the polishing process using the second polishing fluid. After all of the intensity trace values show that the second layer is completely exposed, the polishing process is stopped.
Patent KR-20020063746-A (KR)
Title: Apparatus For Preventing Crimes In Airconditioner
Inventor: YOON DAE DEOK
IPC: G08B13/00
Filed: 2001-01-30
Abstract: PURPOSE: An air conditioner with anti-crime function is provided to air-condition as well as prevent crime. CONSTITUTION: An air conditioner(10) includes detective sensors(110) comprising door switches installed on all of doors in a space where the air conditioner is installed to detect condition of the doors by being turned on when the door is closed and turned off when the door is open; a control device(120) comparing values detected by the detective sensors with preset value to determine and controlling operation of the air conditioner; and an alarming device(130) alarming that one of the doors is open according to the comparison and determination of the control device.
Patent KR-20020068220-A (KR)
Title: Banner holder stand construction
Inventor: AHN DONG HWAN
IPC: E04H12/24
Filed: 2001-02-20
Abstract: PURPOSE: A banner hanger structure is provided to protect a streetlight and a banner from the influence of wind pressure by elastic supporting bar. CONSTITUTION: The banner hanger structure comprises a pair of covers formed by bending oppositely, a fixing screw fitted to both sides of the covers, a supporting member(16) installed to the front of the cover, and an elastic supporting bar(24) coupled to the supporting member(16). The supporting member is comprised of two pillars and pillars have penetration the hole to fix the supporting bar(24).
Patent KR-20020071377-A (KR)
Title: Device for detecting 3 dimension image using positioning sensor
Inventor: LEE JONG SIK
IPC: A61B8/14
Filed: 2001-03-06
Abstract: PURPOSE: A three-dimensional image detecting apparatus using a position sensor is provided to detect a three-dimensional image by mounting a position sensor in an existing ultrasonic diagnosis system. CONSTITUTION: A position sensor(100) is engaged to one end of an ultrasonic probe(10) and senses a position according to the movement of the ultrasonic probe. A position detecting portion(200) detects the moving direction and shift of the ultrasonic probe upon receipt of a position sensing signal from the position sensor. A graphic processing portion(300) combines a plurality of two-dimensional image data according to the position of the ultrasonic probe upon receipt of the position of the ultrasonic probe from the position sensor and the two-dimensional image data from an image converting portion(30), and then displays a three-dimensional image.
Patent KR-20020072137-A (KR)
Title: Tilt detecting apparatus for optical disk
Inventor: KIM JEONG BAE
IPC: G11B7/095
Filed: 2001-03-09
Abstract: PURPOSE: An apparatus for detecting a tilt of an optical disc is provided to detect the tilt without forming a complementary allocated pit address region in the optical disc. CONSTITUTION: An apparatus for detecting a tilt of an optical disc includes the first and second filters, a multiplier, and a low pass filter. The first filter receives a push-pull signal, which corresponds to the difference between the left and right radiation intensities of reflected lights of an optical disc constructed in a manner that the frequency of a track is different from the frequency of data and the frequency of drive servo, to selectively detect only the frequency band of the track. The second filter receives a sum signal corresponding to the sum of the reflected lights of the optical disc to selectively detect only the frequency band of the track. The multiplier multiplies the output signal of the first filter by the output signal of the second filter to generate a frequency signal including a tilting direction and tilting degree of the disc. The low pass filter eliminates the frequency component from the output signal of the multiplier to output a tilt error signal including the tilting direction and tilting degree of the disc.