baber/WOPTO huggingface dataset:
Patent KR-20040054435-A (KR)
Title: Microwave Power Amplifier
Inventor: CHO GYEONG IK
IPC: H03F3/60
Filed: 2002-12-18
Abstract: PURPOSE: An ultrahigh frequency power amplifier is provided to improve a characteristic of undesired gain and a characteristic of input reflection loss in a low frequency band by using a sub-feedback circuit, an RC parallel circuit, and a shunt resistor. CONSTITUTION: An ultrahigh frequency power amplifier includes a first and a second driving amplifier, a first and a second matching circuit, and a power amplifier. The first and the second driving amplifiers(220,222) include a power element, a gate and a drain bias circuit of the power element, an RC parallel circuit connected between the gate of the power element and an input port, a shunt resistor connected between the gate of the power element and the ground, and a sub-feedback circuit connected in parallel to the power element. The first and the second intermediate matching circuits(208,210) are connected to the first and the second driving amplifiers. The power amplifier(224) includes a power distributor, plural power elements, plural gate and drain bias circuits of the power elements, RC parallel circuits connected between the gates of the power elements and the intermediate matching circuits, and a shut resistor connected the gates of the power elements and the ground.
Patent KR-20030055136-A (KR)
IPC: H01L41/083
Filed: 2002-12-24
Abstract: 본 발명은 압전특성이 더욱 우수하고, 높은 신뢰성을 나타내는 압전 세라믹 소자의 제조방법을 제공한다. Pb원소의 화합물을 함유하는 압전 세라믹 재료의 세라믹 그린시트 상에, Ag을 주성분으로 하는 합금을 포함하는 도전성 페이스트를 도포하고, 상기 세라믹 그린시트를 포개서 적층체로 하는 공정; 상기 적층체를 소성시의 승온 과정과 유지 과정에서의 산소농도가 21체적% 이상이고, 또한 강온 과정에서의 산소농도가 0.05체적%∼3체적%가 되는 분위기중에서 소성하는 공정;을 구비한다.
Patent KR-20040058386-A (KR)
Title: System and method for supporting on-demand dedicated connection service between subscribers
Inventor: PARK HEON JAE
IPC: H04L12/28
Filed: 2002-12-26
Abstract: PURPOSE: A system for supplying a request-type dedicated line service between subscribers and a method therefor are provided to comprise a dedicated line service server that a subscriber can access by using an Internet network, and to supply a dedicated line service between different subscribers, thereby dynamically supplying the dedicated line service. CONSTITUTION: Subscriber A accesses a dedicated line service server(200) through an Internet network(400), and requests a dedicated line service between the subscriber A and subscriber B. The dedicated line service server(200) directs each EMS(Element Management System) or each NMS(Network Management System)(100) to configure a regional connection. The EMSs or the NMSs(100) are direct management systems of devices(510-580) that configure a dedicated line network(500). Each EMS or each NMS(100) configures the connection to the corresponding devices(510-580), and configures a dedicated line between the subscriber A and the subscriber B.
Patent KR-20040057702-A (KR)
Title: Method for fabrication of bitline of semiconductor device
Inventor: KIM SANG IK
IPC: H01L21/28
Filed: 2002-12-26
Abstract: PURPOSE: A method for manufacturing a semiconductor device is provided to be capable of preventing encroachment of wet-etchant into a cell region when removing an insulating layer in a peripheral region. CONSTITUTION: A plurality of conductive patterns(G1,G2) are formed on a cell region(X-X') and a peripheral region(Y-Y') of a substrate(40). A BPSG layer(45a) and a TEOS or HDP oxide layer(45b) are sequentially formed on the resultant structure. Plugs(48) are formed to contact the substrate between the conductive patterns through the oxide layer and the BPSG layer of the cell region. By using a photoresist pattern to open the peripheral region, the oxide layer and the BPSG layer of the peripheral region are removed.
Patent KR-20040058927-A (KR)
Title: Laser diode module integrated drive IC and optical pickup apparatus adopting the same
Inventor: LEE JU HYEONG
IPC: G11B7/125
Filed: 2002-12-27
Abstract: PURPOSE: A laser diode module integrated with a driving chip and an optical pickup device adopting laser diode module thereto are provided to form a driving chip necessary for driving a laser diode, and to directly connect the driving chip with the laser diode module, thereby simplifying the number of assembling processes as reducing manufacturing costs. CONSTITUTION: A laser diode module body(21) includes the first plural protruded leads(23) to apply power to a laser diode. A driving chip(25) has a mold resin(27) where a semiconductor element is mounted on a lead frame, and includes the second plural protruded leads(28). Coupling holes into which the first leads(23) are inserted are formed in the mold resin(27). Inner connectors are disposed within the coupling holes to electrically connect with the first leads(23). A main substrate(31) consists of plural lands electrically connected with the second leads(28), and piercing holes(31a) through which the laser diode module body(21) passes.
Patent KR-20030057484-A (KR)
IPC: H01L21/268
Filed: 2002-12-28
Abstract: 기판상에 요철을 마련한 절연막을 형성하고, 이 절연막상에 반도체막을 형성함으로써 레이저광에 의한 결정화시에 상기 반도체막에 응력이 집중적으로 걸리는 부분을 선택적으로 형성한다.  구체적으로는 반도체막에 띠형 또는 직사각형의 요철을 마련한다.  그리고 이 반도체막에 형성된 띠의 요철을 따라 또는 직사각형의 장축이나 단축 방향을 따라 연속 발진의 레이저 광을 조사한다.
Patent KR-20020031378-A (KR)
IPC: G05B19/414
Filed: 1999-07-06
Abstract: 구동제어용의 제어유닛이나, 제어유닛으로부터의 지령을 받아서 모터를 구동하는 서보앰프, 주축앰프, 입출력유닛등의 구성기기를 소유하고, 이들의 구성기기가 통신가능하게 접속되어 있는 구동제어 시스템에서 각 구성기기에 메모리를 설치하는 동시에 구성기기간에서 동기하고, 임의의 구성기기간에서 메모리 데이터의 전송을 하는 통신수단을 설치하고, 임의의 구성기기간에서 메모리를 공유한다.
Patent KR-20020021815-A (KR)
IPC: G06F11/14
Filed: 2000-08-08
Abstract: 차량의 프로세서-기반 시스템은 엔진 크랭킹을 지시하는 신호(10)를 검출한 후 고속으로 저전력 소비상태(16)로 일시중지되어 질 수 있다.  유익하게, 시스템은 전력이 엔진 크랭킹의 결과로서 감소되는 시간 이전에 저전력 소비상태(16)로 되어질 수 있다.  신호가 검출되었을 때 운영 시스템이 액티브이면, 시스템을 감소된 전력 소비 상태(16)로 복귀시키기 이전에 디바이스 상황이 저장되어지게 하는 루틴(15)이 호출될 수 있다.  그렇지않으면, 운영 시스템이 인액티브이면, 시스템을 즉시 감소된 전력 소비 상태(16)로 복귀시키는 인터럽트 핸들러(14)가 호출될 수 있다.  이러한 방식으로, 시스템은 엔진 크랭킹에 고유한 전력 감소에 놓이기 이전에 저전력 소비 상태(16)로 신뢰성있게 복귀될 수 있다.
Patent KR-20020057984-A (KR)
IPC: A61P35/00
Filed: 2000-10-27
Abstract: 본 발명은 궤양 치료제로 사용하기에 적합한 벤즈이미다졸 유도체, 특히 오메프라졸 또는 판토프라졸의 개선된 제조방법에 관한 것이다.
Patent KR-20020061622-A (KR)
IPC: G11B5/187
Filed: 2000-11-22
Abstract: 연마전의 갭 깊이 치수를 GB1로 한 헤드 칩(2)의 전면을 연마하고, 연마 부분(6)을 제거하여 연마후의 갭 깊이 치수를 GB2로 한 헤드 칩(2)의 전면 형상을 형성하는 자기 헤드의 제조방법으로서, 연마전의 헤드 칩의 갭 깊이 치수 GB1가 25㎛ 이하인 것을 특징으로 한다.  이것에 의해, 갭 깊이 치수 GB2와, 헤드 갭과 칩 전면의 곡면 정점 사이의 거리 양쪽의 규격치를 만족하는 자기 헤드의 제품 수율을 높일 수 있고, 갭 깊이 치수 GB2를 작게 하여 자기 헤드 성능을 높인 자기 헤드의 생산성을 높일 수 있다.
Patent KR-20020059815-A (KR)
IPC: H05K7/00
Filed: 2001-09-26
Abstract: 광섬유를 광섬유 고정구에 확실히 고정할 수 있는, 용이하고 저비용의 고정 구조이다.   페룰(1)에는 그 첨단측으로부터 후단부측으로 관통하는 광섬유 끼우고통하는 구멍(2)과 페룰 측면쪽으로부터 광섬유 끼우고통하는 구멍(2)에 연통하는 개구부(4)를 형성한다.   광섬유 끼우고통하는 구멍(2)에 플라스틱 광섬유(3)를 삽입한다.   대향하는 광섬유 끼워두는부분(6)을 가지는 홈통형상의 광섬유 고정 부품(5)을 개구부(4)에 삽입한다.   그리고, 광섬유 끼워두는부분(6)의 내벽면(7) 간에 플라스틱 광섬유(3)를 양사이드로부터 끼워두고, 광섬유 고정 부품(5)의 광섬유 끼워두는부분(6)의 외면(9)은 개구부(4)의 내벽면(8)에 압접시켜 플라스틱 광섬유(3)를 페룰(1)에 이탈방지 고정한다.
Patent KR-20020065566-A (KR)
IPC: C08G18/81
Filed: 2001-10-19
Abstract: 수분산성 폴리이소시아네이트 조성물은 소수성 폴리이소시아네이트(A)와 비이온성 기 및 이소시아네이트기를 함유하는 비닐계 중합체(B)를 포함하여 이루어지고, 수성 매체 중에서 상기 소수성 폴리이소시아네이트(A)를 상기 비이온성 기 및 이소시아네이트기를 함유하는 비닐계 중합체(B)로 분산하는 것이 가능하다.  상기 수분산성 폴리이소시아네이트 조성물은 소수성 폴리이소시아네이트와 비이온성 기 및 이소시아네이트기와 반응하는 활성수소기 함유 기를 함유하는 비닐중합체(b)를, 이소시아네이트기/상기 활성수소기 함유 기를 3∼350의 몰비로 반응시킴으로써 제조된다.
Patent KR-20020065926-A (KR)
IPC: C08K5/00
Filed: 2001-01-10
Abstract: 본 발명은 기저층 및 적어도 하나 이상의 외층으로 구성된 공압출 이축배향 폴리에스테르 필름에 관한 것이다. 본 필름은 적어도 하나 이상의 방염제 및 적어도 하나 이상의 UV안정화제를 함유하고, 두성분 (I) 및 (II)의 혼합물 및/또는 배합물을 포함하는 무광택 외층을 가지며, 성분 (I)는 실질적으로 폴리에틸렌 테레프탈레이트 단일중합체, 폴리에틸렌 테레프탈레이트 공중합체, 또는 폴리에틸렌 테레프탈레이트 단일중합체 또는 폴리에틸렌 테레프탈레이트 공중합체의 혼합물이고, 성분(II)는 적어도 하나 이상의 술포네이트기를 포함하는 중합체이다.
Patent KR-20020071970-A (KR)
IPC: C08F285/00
Filed: 2001-01-26
Abstract: The invention relates to a process for preparing an impact-modified plastic based on grafted crosslinked rubber particles, and also to an impact-modified plastic obtainable by the process. To prepare the impact-modified plastic, (a) particles of a crosslinked rubber are produced from a first monomer mixture which has a content of <50% by weight, preferably <5% by weight, particularly preferably <2% by weight, of diene compounds. The particles of the crosslinked rubber are (b) grafted with a second monomer or monomer mixture, with formation of a graft shell. Particles of the grafted crosslinked rubber are (c) added to a third monomer mixture, and the monomers of the third monomer mixture (d) are polymerized, with formation of a matrix. The process of the invention is simple to carry out and gives impact-modified plastics with very good mechanical properties, in particular with better resistance to weathering.
Patent KR-20020092384-A (KR)
IPC: E06B5/16
Filed: 2001-03-14
Abstract: A hydraulic fire door, especially a sliding door, which can be selectively opened or closed by an actuator. In order to ensure a particularly fire resistant fire door without the heat resistance of the basic structure thereof having to be particularly fire resistant, the actuator is arranged to supply aqueous liquid to the fire door in order to cool it using the aqueous liquid.
Patent KR-20020094060-A (KR)
IPC: B29C63/02
Filed: 2000-10-03
Abstract: Steered vacuum-assisted laminating apparatus and methods of using the same are disclosed. The apparatus includes a vacuum-assisted laminator for applying large format films to substrates where lamination pressure is generated at least partially by a vacuum drawn in a vacuum cavity. The apparatus also includes a steering system to control the vertical position the laminator and a vehicle to move the laminator along the substrate in a desired direction.
Patent KR-20040064777-A (KR)
Inventor: CHO MYUNG SOOK
IPC: A23L13/70
Filed: 2003-01-10
Abstract: PURPOSE: A method of producing pork being wrapped in a large cabbage leaf like a bundle by heating a pork carcass in an Acanthopanacis Cortex extract and spices is provided. The pork being wrapped in a large cabbage leaf(toejigogi for bossam) is eliminated in the odor of pork and has enhanced taste and flavor of port as well as an efficacy of Acanthopanacis Cortex. CONSTITUTION: Roots of Acanthopanacis Cortex are added with distilled water at the ratio of 1 : 5-7 and extracted at 70 to 95deg.C for 3 to 5hr. Fruits of Acanthopanacis Cortex are added with distilled water at the ratio of 1 : 8-12 and extracted at 70 to 95deg.C for 1 to 5hr. Thus obtained extracts are mixed and heated with a pork carcass and spices. For an example, 200g Acanthopanacis Cortex root is washed and ground to 5 meshes. Then, 200g Acanthopanacis Cortex root powder is heated with 1.2L distilled water at 85deg.C for 4hr two times. Thereafter, 200g Acanthopanacis Cortex fruit is washed and ground to 8 meshes. Then, 200g Acanthopanacis Cortex fruit powder is heated with 2L distilled water at 60deg.C for 2hr two times, The extracts are mixed in a weight ratio of 1:1 and heated with 1kg pork and spices.
Patent KR-20040066224-A (KR)
Inventor: KANG GYEONG JIN
IPC: H04W4/16
Filed: 2003-01-17
Abstract: PURPOSE: A method for bell sound service, and an apparatus thereof is provided to maximize intimacy between a caller and a receiver by creating an atmosphere with a sweet melody. CONSTITUTION: A melody service server receives a melody from a caller or selects a melody desired by the caller among melodies already generated. If receiving the melody by preliminarily designation, a transmission server, SMS(Short Message Service) server sets up the melody as the peculiar bell sound for the caller and transmits the melody to a receiver with information of the caller. An exchange server connects a call from the caller to the receiver.
Patent KR-20040068744-A (KR)
Inventor: JEONG HAK
IPC: H04Q9/00
Filed: 2003-01-27
Abstract: PURPOSE: A system for remotely collecting data information by using local area wireless communication is provided to enable a central collector to collect data transmitted from data detection terminals. CONSTITUTION: In order to collect data information of multiple data detecting terminals, which have wireless modules positioned in the field, in one central collector(10), the central collector(10) includes a wireless module and a communication control program for communicating with and controlling the on-the-spot terminals. The on-the-spot terminals detect data suitable for its intention, calculate and store it. The on-the-spot terminals transmit transmits the data to the central collector(10) at every certain time according to each recognition number. Emergency data is given a priority transmission code and urgently transmitted to the central collector(10). The on-the-spot terminals receive a transmission command issued by designating its recognition code by the central collector(10), thereby transmitting its own data information.
Patent KR-20030066375-A (KR)
Title: 선형액츄에이터
IPC: F01B29/00
Filed: 2003-01-29
Abstract: 간편한 구성에 의해 저렴하게 제조할 수가 있으며, 조립작업성의 향상을 도모한다. 
     액츄에이터본체(12)의 내부에 설치되어 압력유체의 작용하에 변위하는 피스톤(46)과, 상기 피스톤(46)과 일체적으로 연결되어 직선상으로 변위하는 슬라이드테이블(20)과, 상기 슬라이드테이블(20)에 나사결합되며, 피스톤(46)의 결합홀(52)에 축부(62)가 삽입되는 로드(58)와, 상기 액츄에이터본체(12)의 단부에 연결된 엔드브록(16a, 16b)과, 상기 엔드블록(16a, 16b)의 단면에 설치되어 슬라이드테이블(20)의 변위량을 조정하는 스토퍼(70a, 70b)를 구비한다.
Patent KR-20040071378-A (KR)
Title: Washing machine
Inventor: LEE MYEONG GYU
IPC: D06F23/04
Filed: 2003-02-06
Abstract: PURPOSE: A washing machine is provided to wash the laundry efficiently with wobbling of a washboard by moving a support member up and down or right and left with a universal joint, and to replace and repair easily by assembling and disassembling the support member from the universal joint. CONSTITUTION: A wobbling device(20) comprises a vertical rotating shaft(21) connected to a washing shaft(6b); an inclined rotating shaft(22) inclined in the upper part of the vertical rotating shaft; a first rotating member(30) integrally rotating the vertical rotating shaft and the inclined rotating shaft; a second rotating member(40) containing the inclined rotating shaft, and having the lower part placed on the rotating member; a washboard(60) wobbling in rotating the second rotating member in the first rotation direction and leveling in rotating the second rotating member in the second rotation direction; a support member(80) arranged between the second rotating member and the washboard to support the wobbling washboard; and a universal joint(100) supporting the support member moving up and down or right and left.
Patent KR-20040072117-A (KR)
Inventor: KIM JUN SU
IPC: H04W4/24
Filed: 2003-02-08
Abstract: PURPOSE: A method for approving connection for supporting collect call charge in a wireless Internet is provided to pay a charge for wireless Internet connection through a collect call service while preventing a charge for personal use of employees from being shifted on a company. CONSTITUTION: A monitoring server continuously monitors whether a user requests to connect to a site(100). The monitoring server judges whether the user is currently connected with a free site(102). If not, the monitoring server judges whether a connection-requested site address is included in an address list of free sites(104). If not, the monitoring server passes the connection request so that the user receives a service from a paid site(106). If so, the monitoring server judges whether the connection address is an initial connection URL(Uniform Resource Locator)(108). If not, the monitoring server removes the connection request(110). The monitoring server increases a session error count by 1(118). If the connection address is the initial URL, the monitoring server judges whether a user telephone number is included in a list of site connection allowed users(112). If so, the monitoring server stores session information of the user as free session and initializes the session error count(114). If not, the monitoring server removes the connection request, and increases the session error count by 1(116,118). If the user is currently connected with the free site, it is judged whether the session error count is larger than a threshold(120). If not, it is judged whether the connection-requested address is a directory server address(122). If not, it is judged whether the connection-requested address is included in the connection addresses of a session information table(126).
Patent KR-20040072219-A (KR)
Inventor: CHOI JONG HYEON
IPC: G11C16/30
Filed: 2003-02-10
Abstract: PURPOSE: A semiconductor integrated circuit device having a dual insulation system is provided to prevent the degradation of an operation speed and also to reduce an electric field on a gate insulator of a MOS transistor effectively. CONSTITUTION: The first internal circuit(12) includes the first MOS transistor operating at the first voltage higher than ta power supply voltage and having a relatively thick gate insulator. The second internal circuit(14) includes the second MOS transistor operating at the second voltage lower than the first voltage and having a relatively thin gate insulator. And a voltage limitation circuit limits a voltage transferred from the first internal circuit to the second internal circuit, to reduce an electric field on the gate insulator of the second MOS transistor.
Patent KR-20040072388-A (KR)
Inventor: LEE HYEON JEONG
IPC: H04W88/18
Filed: 2003-02-12
Abstract: PURPOSE: A method for providing a voice mail box service using a mobile application part protocol in an asynchronous mobile communication system is provided to standardize an individually realized a UMTS(Universal Mobile Telecommunications Systems) voice mail box service in a UMTS map protocol, thereby efficiently realizing inter-networking. CONSTITUTION: If a calling subscriber inputs the number of a called subscriber, a path mobile exchanger transmits an SRI(Send Routing Information) message for inquiring of position information of the called subscriber to a home location register(202). The home location register judges a not-reachable state of the called subscriber(204). The home location register assigns a VSRN(VMS Service Roaming Number) and sends a response message including the VSRN to the path mobile exchanger(206). The path mobile exchanger grasps a position of a voice mail box system where the called subscriber is registered, and executes an IAM(Initial Address Message) to the voice mail box system(208). If the called subscriber is reachable, the optimum path conditions are judged(210). The home location register transmits a PSI(Provide Subscriber Information) message to a visitor location register to request register information of the called subscriber(212). The visitor location register transmits a PSI response message to the hole location register(214). The home location register assigns a VSRN and sends a response message including the VSRN to the path mobile exchanger(216). The path mobile exchanger grasps a position of the voice mail box system where the called subscriber is registered, and executes an IAM to the voice mail box system(218). If the optimum path is not supported, the home location register transmits a providing roaming number message to the visitor location register(220). The home location register transmits a response message including absent subscriber error information to the home location register(222). The home location register executes a VMS(Voice Message Service) service according to a not-reachable state(224). The path mobile exchanger grasps the position of the voice mail box system where the called subscriber is registered, and executes an IAM to the voice mail box system(226).
Patent KR-20040073741-A (KR)
Title: Power supply apparatus for motor
Inventor: PARK WON GI
IPC: H02H3/20
Filed: 2003-02-14
Abstract: PURPOSE: A power supply apparatus is provided to reduce parts count and manufacturing costs and size of the apparatus. CONSTITUTION: A power supply apparatus comprises a resistor(15) disposed in a first added line branched off from the positive power supply end of a rectifier(3) and connected to an end of a capacitor(5) in such a manner that the rush current to the capacitor or the over-voltage applied to both ends of the capacitor from a motor(7) is consumed as a thermal energy; an over-voltage protection diode(17) having a cathode connected to the positive power supply end of the rectifier, and which is arranged in parallel with the resistor; an over-voltage protection switching element(11) connected to the anode of the over-voltage protection diode and connected to the other end of the capacitor; a dynamic braking resistor(13) disposed in a second added line for interconnecting connecting ends of an inverter unit(9); a first switching unit for selectively connecting the end of the capacitor to one of the positive power supply end of the rectifier and the resistor disposed in the first added line; a second switching unit for selectively connecting the connecting end of the inverter unit to one of a power supply line and the dynamic braking resistor disposed in the second added line; and a control unit for controlling the first and second switching units.
Patent KR-20040073744-A (KR)
Inventor: SEO SANG UK
IPC: G06Q50/22
Filed: 2003-02-14
Abstract: PURPOSE: A system and a method for a pet management service are provided to link the pet management with each institution through the online and control entry when a user together with a pet visits a public place or building. CONSTITUTION: A microchip(110) is injected into each pet and is wirelessly recognized in a local area. A reader(120) recognizes the microchip injected into the pet entering a gate and processes recognition information by installing to the gate of the public place or building. A server(130) obtains various kinds of information related to each pet from pet related companies, is equipped with a database(131) storing the obtained information, and provides the information for the pet holding the microchip by linking with the reader. An informing part(140) informs the user of the information received from the server through the network.
Patent KR-20040073768-A (KR)
Inventor: PARK YONG SEOK
IPC: D06F39/14
Filed: 2003-02-14
Abstract: PURPOSE: Hinge structure of a lid for a washing machine is provided to improve the appearance of the lid of the washing machine by preventing exposure of the hinge structure for combining a front lid with a rear lid. CONSTITUTION: A lid(50) of a washing machine is composed of a rear lid(52) turned and installed in the upper part of a body and composed of a hinge hole(62) formed at the side of a bent part(52a) formed in the end, and a front lid(54) combined with the end of the rear lid and folded by a hinge pin(60). A bent part(54a) is formed in the rear part of the front lid, and arranged in parallel with the bent part of the rear lid. The hinge pin is formed in the end of the bent part and combined with the hinge hole. The hinge hole is formed in the rear part of the bent part of the rear lid to prevent exposure of combination of the hinge pin and the hinge hole through the transparent window of the front lid.
Patent KR-20040077160-A (KR)
Inventor: YANG JUN YEONG
IPC: G02F1/136
Filed: 2003-02-28
Abstract: PURPOSE: A fabrication method of a driving element and a switching element for a driving circuit integrated LCD device is provided to fabricate a TFT in a top gate-staggered type, to form source electrodes and drain electrodes under gate electrodes, thereby omitting a semiconductor layer contact hole process. CONSTITUTION: An inorganic insulating layer and a metal layer are formed by continuously depositing an inorganic insulating material and a metal material on a front side of a substrate(100) where semiconductor layers(122,125) are formed. A PR(Photo Resist) is coated on the metal layer, and PR patterns(127) are formed in parts where gate electrodes(147,150) are to be formed through the third mask process. Gate insulating films(135,140) and the gate electrodes(147,150) are formed by etching the metal layer and the inorganic insulating layer. By overetching the two layers, the gate electrodes(147,150) and the gate insulating films(135,140) are formed smaller than the PR patterns(127).