baber/WOPTO huggingface dataset:
Patent KR-20020035223-A (KR)
Title: Mobile Antenna System for DBS(Direct Broadcasting Satellite) Reception and DBS Tracking Method
Inventor: CHAE YUN GYEONG
IPC: H01Q3/26
Filed: 2000-11-04
Abstract: PURPOSE: A satellite broadcast mobile receiving antenna system and satellite tracking method is provided to simplify system configuration, while achieving an improved satellite broadcast receiving capability. CONSTITUTION: An antenna system comprises a left sub-array antenna(41L) and a right sub-array antenna(41R) for receiving satellite broadcast; a low-noise frequency down-converter(42) for taking, as an input, the satellite broadcast signal received at the left sub-array antenna and the right sub-array antenna, and down-converting the frequency; a control beam generator(43) for distributing the satellite broadcast signal which is frequency down-converted by the frequency down-converter, and forming a control signal for antenna beam tracking; a power coupler(45) for synthesizing the frequency down-converted satellite broadcast signal distributed by the control beam generator; a rotary joint(46) for receiving the frequency down-converted satellite broadcast signal synthesized by the power coupler, and serving as a signal transmitter between a rotor unit and a stator unit; a satellite broadcast receiver(47) for receiving the frequency down-converted satellite broadcast signal from the rotary joint, and demodulating the received signal; and a control unit(44) for receiving the control signal from the control beam generator, generating an auto gain control voltage, and executing satellite tracking algorithm by detecting the auto gain control voltage.
Patent KR-20010008180-A (KR)
Inventor: PARK DONG YOUN
IPC: C02F1/00
Filed: 2000-11-14
Abstract: PURPOSE: A cultivating system of aquatic plant for sewage purification is provided, which uses waste plastic and vinyl as the raw material thus reducing waste, prevents chlorophyatic phenomena by discharging clean water after purifying, can achieve remediation of ecosystem and can provide an educational site for students by showing the natural remediation of the environment. CONSTITUTION: The system comprises the followings: (i) an aggregate settling device(8) formed between the sluice gates under a bridge for settling sand and gravel; (ii) a settling device(120) for settling sludge and heavy metal that were not settled at the settling device(8); (iii) a purifying device for preventing influent of sludge to the aquatic plant cultivating device; and (iv) an aquatic plant cultivating device(10) for purifying sewage and discharging clean water.
Patent KR-20020039127-A (KR)
Title: A system for cleaning and security using internet and the method
Inventor: CHOI YEONG SEOK
IPC: G06F19/00
Filed: 2000-11-20
Abstract: PURPOSE: A system for cleaning and security using the Internet and the method are provided to clean an inside of a house while checking an inside state of the house at remote site by using the Internet. CONSTITUTION: The crime prevention and cleaning system comprises a control computer(10), a cleaner(16), a server system(30) and a user terminal(40). The control computer has a connection program(13) transferring and receiving the necessary data by connecting to the Internet(20) and a control program(14) controlling the cleaner. The cleaner is controlled by the control program and has a camera(17). The video data obtained by the camera is transferred to the control computer through the control program. The control computer connects to a server system(30) through the Internet and includes a server(32). The server communicates various kinds of signals transferred from the control computer and the user terminal and includes a cleaning program(33) and a game program(34).
Patent KR-20010051867-A (KR)
Inventor: CLOCKHERTZ PETER DAVID
IPC: C07C47/22
Filed: 2000-11-22
Abstract: PURPOSE: To provide a new production method enabling the attainment of productivity augmentation by operation at a reactive hydrocarbon space velocity of > 100 h-1. CONSTITUTION: A catalytic vapor phase oxidation process comprises the following steps: (A) providing an oxidation reactor containing plural contact tubes placed in a reactor shell, the inside of which is divided into at least two of first and second heat transfer zones, and a heat transfer medium passes through either of the zones; each of the contact tubes contains at least two oxidation catalysts which can jointly oxidize a reactive hydrocarbon into a product gas comprising (meth)acrylic acid; the contact tubes are packed with at least two oxidation catalysts mentioned above in such a way as to provide a peak-to-salt temperature sensitivity of <= 9 deg.C ; and (B) a reactant composition comprising at least one reactive hydrocarbon and oxygen is fed into the oxidation reactor at a reactive hydrocarbon space velocity of 135 h-1 to 300 h-1 in order to contact the reactant composition with the at least two oxidation catalysts to form the product gas comprising (meth)acrylic acid.
Patent KR-20020040047-A (KR)
Title: Flash rom write method for embedded system
Inventor: LEE GYEONG IL
IPC: G06F12/16
Filed: 2000-11-23
Abstract: PURPOSE: A method for writing a flash-ROM of an embedded system is provided to make a flash ROM be written by dumping a flash write program in a built-in RAM and operating the flash write program stored in the RAM as an embedded system which uses a single ROM. CONSTITUTION: An embedded system is operated in an off-line mode(S31). A flash write program stored as an image form is stored in a RAM(S33) by operating a loading program(S32). If the flash write program stored in a ROM is stored in a RAM completely(S34), the flash write program is operated(S35). The flash write program requests information with respect to a status of the ROM to be modified and enters to a receipt waiting status for receiving program contents from a PC when an address area is received from a user. The user transmits a program of a target board through a communication emulator of the PC, the flash write program analyzes an address of the received binary file and loads the binary file in the corresponding address. If all binary files are transmitted from a PC by repeating the above processes, a transmission completion is informed to a user, and the files are written in a flash ROM(S36).
Patent KR-20010062143-A (KR)
Inventor: ITO SHINICHI
IPC: F25B9/00
Filed: 2000-12-06
Abstract: PURPOSE: An air conditioning device is provided to achieve stable cooling effect by suppressing the generation of freezing in an indoor heat exchanger at the time of refrigeration operation while an outdoor air temperature is low even if a non-azeotropic refrigerant mixture is adopted. CONSTITUTION: An air-conditioning device(10) consists of a compressor(16), an outdoor heat exchanger(19), an expansion valve(22), an indoor heat exchanger(21) and an accumulator(17). All of the units are successively connected for composing a loop-shaped refrigerant circuit(9). A non-azeotropic refrigerant mixture is circulated in the refrigerant circuit. A refrigerant having a high boiling point is stored in the accumulator while a refrigerant having a low boiling point is circulated in the refrigerant circuit out of the non-azeotropic refrigerant mixtures. Thereby, the generation of freezing in the heat exchanger is inhibited and the stable cooling effect is achieved at the time of refrigeration operation while an outdoor air temperature is low.
Patent KR-20020045285-A (KR)
Title: Manufacturing method of β-adrenergic antagonists having character of optical stereoisomers
Inventor: JANG SI YEONG
IPC: A61K31/133
Filed: 2000-12-08
Abstract: PURPOSE: Provided is a process of preparing a beta-blocking agent by treating allyl alcohol with a strong base, adding optical isomer derivatives to the epoxy compound thus being obtained and then agitating at specified temperature. Whereby, the high purity product is obtained in high yield. CONSTITUTION: An ArOH as the formula 1 of the reaction 1 is treated with a strong base such as sodium amide, sodium hydride and potassium hydride in an aprotic solvent and condensed with (R)-or (S)-epichlorohydrin to give a compound of the formula 2, (R)-or (S)-stereoisomer or optical isomer thereof having a purity of 96% or more is selectively prepared. In formula, Ar is substituted phenyl, R is isopropyl.
Patent KR-20020045876-A (KR)
Title: A heater of micro wave oven
Inventor: HAN SEONG JIN
IPC: F24C7/06
Filed: 2000-12-11
Abstract: PURPOSE: A heater is provided to uniformly or partially heat food by forming plural heating bodies and selectively operating the heating bodies. CONSTITUTION: A heater(60) of a microwave oven generates heat needed for cooking food by arranging on a cavity. The heater comprises plural heating bodies(62) arranged in constant intervals. The heating bodies are selectively operated to heat partially. The heating bodies are circularly arranged to uniformly heat food. The heating bodies(62) are consist of a first heating body group(64) and a second heating body group(68). The first and the second heating body groups are individually connected with lead wires to feed current from a power unit. Each heating body transmits heat into the cavity by supporting through a supporting body(70) and operating through the current. Therefore, various kinds of food are cooked and the using current is reduced.
Patent KR-20020051043-A (KR)
Title: Device for testing automatically antenna in cellular phone
Inventor: SHIN JI HYEON
IPC: H04B17/00
Filed: 2000-12-22
Abstract: PURPOSE: An apparatus for automatically diagnosing a terminal antenna is provided to enable a developer to diagnose the performance of an antenna without the necessity of using a special equipment. CONSTITUTION: An apparatus for automatically diagnosing a terminal antenna consists of a bidirectional coupler(100), an A/D(Analog/Digital) converter(200), an MSM(Mobile Station Modem,300), and a display part(400). The bidirectional coupler(100) executes coupling for a transmitting signal outputted from a power amplifier(1) in a transmitting part, detects the power of the transmitting signal, and outputs it to the A/D converter(200) through a transmitting wave coupling port(a). The A/D converter(200) receives a transmitting wave signal power strength and a reflected wave signal power strength from the bidirectional coupler(100), converts them into digital signals, and outputs the converted signals to the MSM(300). The MSM(300) receives the digital transmitting wave signal power strength and the digital reflected wave signal power strength from the A/D converter(200) and obtains the reflection factor and VSWR(Voltage Standing Wave Ratio) of the present antenna through the two strengths. Then the MSM(300) compares the VSWR with a reference value, judges whether the antenna is abnormal, and outputs a relevant display control signal to the display part(400). The display part(400) displays the current state of the antenna according to the display control signal received from the MSM(300).
Patent KR-20020051146-A (KR)
Title: A device for suppressing strip tension hunting in horizontal looper
Inventor: NAM SEONG HYEON
IPC: B21B37/50
Filed: 2000-12-22
Abstract: PURPOSE: A device for suppressing tension change of a strip using a roller guide in a horizontal looper is provided which suppresses tension change of the strip in the horizontal looper by maintaining the wire rope so that tension of a wire rope acting on a pulley is always parallel to the line center line using the roller guide. CONSTITUTION: The device for suppressing tension change of a strip using a roller guide(14) in a horizontal looper comprises a drum(13) to which a wire rope(12a,12b,12c) is connected to suppress tension change in the looper; a pulley(11) fixed to a looper car; and driving and non-driving roller guides(14) consisting of a roller installed between the drum(13) and the pulley(11), and a shaft and a bearing fixing the roller, wherein a guide groove is formed on the roller guide to guide the wire rope(12a,12b,12c) to a length direction of the circumference of the roller.
Patent KR-20020054039-A (KR)
Title: Seating torque measuring method of cylinder head cover and head bolt
Inventor: KIM SEONG EUN
IPC: G01M17/00
Filed: 2000-12-27
Abstract: PURPOSE: A seating torque measurement method is provided to measure the compression amount and seating torque for head bolt and gasket in a convenient manner, while allowing abnormality of head bolt to be judged in an easy manner. CONSTITUTION: A seating torque measurement method comprises a first step of fitting a head bolt to a cylinder head, and coupling, at a torque of 0.2kg.m, the head bolt and cylinder head until the head bolt does not rotate any more; a second step of marking reference lines to the top surfaces of the head bolt and the cylinder head, respectively, when the head bolt and the cylinder head are completely coupled; a third step of mounting a gasket and a cylinder head cover onto the cylinder head after separating the head bolt from the cylinder head, and inserting the head bolt into the cylinder head cover and the cylinder head; a fourth step of assembling the head bolt to the cylinder head at a force of 0.1kg.m, and measuring angles of reference lines marked at the head bolt and the cylinder head; a fifth step of measuring and recording angle of reference lines at each torque while increasing torque at an interval of 0.1kg.m; and a sixth step of determining the total torque applied to the head bolt as a seating torque for the head bolt, at the time where the reference line of the head bolt and the reference line of the cylinder head match each other.
Patent KR-20020053639-A (KR)
Inventor: SHIN JEONG YONG
IPC: C03B5/027
Filed: 2000-12-27
Abstract: PURPOSE: A melter for glass furnace is provided to suppress influx of corroded impurities into molten glass in melter, which results in high quality glass products. CONSTITUTION: The melter(10) in a shape of duct is composed of base, side and cover walls. The side walls(26, 27) has two types of; a first side wall(26) supports the cover wall(24), and a second wall(27) stands on the base wall(25), which is shifted a bit to inner melter. A small convex rib(30) made of refractory bricks is located between two type side walls, resulting in prohibiting eroded impurities from flowing into melter. A small sized gap between the rib and the first side wall is useful to remove eroded impurities.
Patent KR-20020055894-A (KR)
Title: Circuit for verifying a flash memory device
Inventor: LEE JONG SANG
IPC: G11C16/20
Filed: 2000-12-29
Abstract: PURPOSE: A verification circuit of a flash memory device is provided to stabilize an operation of the flash memory device by generating an output signal regardless of an input signal. CONSTITUTION: The first NOR gate(11) performs a logical operation for an input signal(PASS) and a window bar signal(WINDOWb). An S-R latch circuit(100) is formed with the second and the third NOR gates(12,13). The S-R latch circuit(100) receives an output signal and the window bar signal(WINDOWb) from the first NOR gate(11) and latches data. An inverter(14) inverts an output signal of the S-R latch circuit(100). A D-flipflop circuit(200) performs the logical operation for an output signal(Q11) of the inverter(14) and a window signal(WINDOW) and outputs a signal(iPASS). The S-R latch circuit(100) is operated as a window strobe and the D-flipflop circuit(200) is operated as a circuit for storing the output of the S-R latch circuit(100).
Patent KR-20010067033-A (KR)
Inventor: KIM JU WAN
IPC: H04B7/15
Filed: 2000-12-29
Abstract: PURPOSE: A wide band radio relay apparatus for a mobile communication is provided to amplify a weak original signal and relay it by separating a transmission antenna and a receiving arrangement antenna as far as a predetermined distance in a vertical direction and restraining an interference signal through a spare area signal processing. CONSTITUTION: A receiving arrangement antenna(101) receives a radio wave from a mobile communication network base station and an interference signal fedback from a transmission antenna together. A multi-channel receiver(102) demodulates a signal outputted from the receiving arrangement antenna(101) and converts it into a signal required for a space signal processor(103). The space signal processor(103) changes a signal outputted from the multi-channel receiver to a digital signal, processes it to restrain the interference signal, changes it to an analog signal, and outputs it. A signal modulating and amplifying unit(104) modulates the interference signal outputted from the space signal processor, amplifies it and transmits it to a transmission antenna(105). The transmission antenna(105) receives the output of the signal modulating and amplifying unit(104) and transmits a radio wave to a radio wave shade area.
Patent KR-20010022240-A (KR)
IPC: B29C49/46
Filed: 1998-07-16
Abstract: The invention concerns a method whereby in an installation (1, 2, 3) for making containers (200, 300) by blowing blanks (400), for example thermoplastic preforms, the high pressure fluid derived from degassing a container is re-used and injected (14) into a container previously degassed, for example for cooling it or for thoroughly spraying the inside thereof to solidify the material.
Patent KR-20010031549-A (KR)
Title: 머시닝 플랜트의 가능한 구조들을 결정하기 위한 프로세스
IPC: H01L21/66
Filed: 1998-10-28
Abstract: 본 발명은, 적어도 하나의 제품을 제조하기 위해, 각각 다수의 머시닝(machining) 모듈을 갖는 다수의 머시닝 플랜트를 제어하기 위한 프로세스에 관한 것이다.  본 발명에 따른 프로세스는, 
     - 각각의 경우에 특정 머시닝 플랜트가 선택되고 상기 머시닝 플랜트에 의해 수행될 상기 머시닝 단계가 정의되는 개별 프로세스 지령들의 시퀀스를 상기 제품에 대해 결정하는 단계, 
     - 수행될 상기 머시닝 단계에 따라서 상기 머시닝 플랜트의 가능한 구조들과 상기 머시닝 플랜트에서 상기 제품을 머시닝하기 위해 상기 개별 구조들과 관련된 시간 주기를 결정하는 단계, 
     - 상기 머시닝 플랜트에서 상기 머시닝 모듈의 주어진 순간의 실제 상태에 대한 정보를 결정하는 단계, 
     - 상기 머시닝 단계에 따라 상기 머시닝 플랜트의 가능한 구조들과 상기 머시닝 모듈의 상기 상태에 대한 정보로부터 상기 머시닝 모듈의 상기 상태와 상기 머시닝 플랜트에서 상기 제품을 머시닝 하기 위해 상기 개별 구조들과 관련된 시간 주기에 따라 가능한 상기 머시닝 플랜트의 상기 구조들을 결정하는 단계, 
     상기 가능한 구조들과 상기 개별 구조들과 관련된 시간 주기에 근거하여 최적 알고리즘으로 상기 개별 머시닝 플랜트에서 수행될 상기 개별 프로세스 지령들의 시퀀스를 정의하는 단계를 포함한다. 
     본 발명에 따른 첫번째 프로세스에서, 어떠한 개별 지령들이 머시닝 플랜트에 의해 동시에 수행될 수 있을 지에 대해 정보가 결정된다. 
     본 발명에 따른 두번째 프로세스에서, 상기 제품의 제조 프로세스가 하나 이상의 개별 프로세스 지령들에 의해 실현되는 개별 프로세스 목표들로 분리되며, 머시닝 플랜트가 선택되는 하나 이상의 개별 프로세스 지령들과 적어도 두개의 서로 다른 머시닝 플랜트가 선택되는 다수의 개별 프로세스 지령들 중 하나에 의해 실현될 수 있는 이들 프로세스 목표들이 제공된다.
Patent KR-20010032525-A (KR)
Title: 마그네슘 압력주조 시스템 및 방법
IPC: B22D21/00
Filed: 1998-11-30
Abstract: 본 발명은 다이 캐비티을 한정하는 주조 또는 다이가 있는 압력주물기로 용융 또는 딕소트로픽에 마그네슘합금의 압력주조를 위해, 용융 마그네슘합금이 다이 캐비티 내에 주입될 수 있는 하나 이상의 러너를 한정하는 다이 또는 주조 도구 수단을 포함하는 금속 유동 시스템을 제공하거나 이용한다. 본 발명의 제1 형태에 있어서, 금속 유동 시스템은 유동 시스템 내에 금속 유동 속도를 제어를 제공하는 형태이고, 이에 의해 대체로 다이 캐비티 전체에 걸쳐 흐르는 모든금속은 점성이고 또는 반고체상태이다. 
     본 발명은 또한 마그네슘합금의 주조를 생산하는 과정을 제공하고, 다이 캐비티을 한정하는 주조 또는 다이가 있는 압력주조기를 이용하여, 또한, 용융마그네슘이 다이 캐비티 내로 주입되는 시스템의 하나 이상의 러너를 한정하는 다이 또는 주조 도구수단을 포함하는 금속유동 시스템을 이용하여, 마그네슘합금을 용융 또는 딕소트로픽 상태에서 주조하고, 유동 시스템은 금속유동 속도를 제어하여 다이 캐비티 전체에 걸쳐서 흐르는 거의 모든 금속이 점성 또는 반고체상태의 형태이다.
Patent KR-20010032802-A (KR)
IPC: F27D13/00
Filed: 1998-11-12
Abstract: A feeding device for closed shaft furnaces connected to a gas-extracting device, in particular for low shaft furnaces for melting steel scrap, having a transporting device, which leads to the head of the upper furnace vessel and is integrated at least partially in the furnace atmosphere, and a distributing device for distributing the charge. In this case, a carousel which can be charged by a conveying device is provided in the furnace head. The carousel, in the furnace head, is guided rotatably on a path, fastened on the casing of the upper furnace vessel, above the gas-extracting device and has shutter elements connected to actuators.
Patent KR-20010041965-A (KR)
Title: 탄화 규소 반도체 스위칭 장치
IPC: H01L29/04
Filed: 1998-03-19
Abstract: 본 발명의 반도체 스위칭 디바이스는 제 1 도전형인 육방 대칭성의 탄화규소 단결정 및 제 1 도전형에 반대되는 제 2 도전형이고 탄화규소 단결정 내에 위치하는 반도체 영역을 포함한다.  제 1 도전형의 탄화규소 단결정 및 제 2 도전형의 반도체 영역은 pn 접합을 형성한다.  pn 접합 인터페이스는 탄화규소 단일 결정의 표면으로부터 깊이 방향으로 연장하는 인터페이스를 가지며 이 인터페이스는 탄화규소 단결정의 〈1120〉 방향과 평행한 또는 거의 평행한 결정면을 포함하여 리크 전류를 감소시킨다.
Patent KR-20010042833-A (KR)
Title: 연료분사밸브
IPC: F02M45/08
Filed: 1999-12-30
Abstract: 연료배출구(4)의 개폐를 조절하는 밸브부품(1), 밸브부품(1)을 작동시키는 작동수단 및 밸브부품(1)의 개방행정에 반대로 작용하는 보정력을 밸브부품(1)에 제공하는 보정 수단을 가지는 연료분사밸브로써, 상기 보정 수단이 해당실린더(11)에서 작동하는 피스톤(10)을 가지며, 이때 상기 피스톤(10)의 한편은 실린더(11)안에서, 기준압이 작용하는 유압챔버(12)와 경계를 이루며, 다른 한편은 초기위치에서 실린더(11)에 상대적으로 고정된 스톱부(18)로 지지되고, 밸브부품(1)에 의해 동력전달수단을 통해 그의 초기위치로부터 스톱부(18)에서 멀어지도록 작동되며, 또한 그의 제어능력이 향상된다. 
     이것은 동력전달수단을 밸브부품(1)이 개방행정을 수행할 때 밸브부품(1)이 스프링소자(15, 16)에 장력을 가하도록 구성함으로써 달성된다.
Patent KR-20010043148-A (KR)
Title: 연료 분사 밸브
IPC: F16K31/44
Filed: 1999-10-20
Abstract: 본 발명은, 특히 내연 기관의 연료 분사 시스템을 위한 연료 분사 밸브와 같은 연료 분사 밸브(1)에 관한 것으로서, 이 연료 분사 밸브는 압전식 또는 자기 변환식 액츄에이터(13)와, 이 액츄에이터(13)와 밸브 니들(2)에 의해 작동 가능하며 밸브 시트면(5)과 협동하여 밀봉 시트를 형성하는 밸브 폐쇄체(3)를 포함한다.  또한, 상기 연료 분사 밸브는 액츄에이터(13)와 밸브 니들(2) 사이에 배치되어 밸브 니들(2)의 긴 밸브 니들 스트로크 내로 액츄에이터(13)의 액츄에이터 스트로크를 증가시키기 위해 제공된 변환 장치를 갖는다.  이를 위하여, 상기 변환 장치는 반경 방향으로 연장된 적어도 하나의 강성 레버 세그먼트(26, 27)를 갖는 적어도 하나의 레버 플레이트(21)를 포함한다.
Patent KR-20010078735-A (KR)
IPC: B05C11/10
Filed: 1999-06-08
Abstract: The present invention refers to a method and a device for jetting droplets of a viscous medium onto an electronic circuit board. According to the invention, the viscous medium is applied from a viscous medium supply container to an eject chamber through a tubular passage using a rotatable feed screw arranged within the tubular passage. The viscous medium is then jetted from the eject chamber through an eject nozzle by the rapid decreasing of the volume of the chamber.
Patent KR-20010053018-A (KR)
Title: 항혈관형성 단백질 및 이들을 사용하는 방법
IPC: A61P15/08
Filed: 1999-06-17
Abstract: 본 발명은 항혈관형성 특성을 가진 단백질 및 이들을 사용하여 혈관형성을 억제시키는 방법에 관한 것이다.
Patent KR-20010086345-A (KR)
Title: Process for Preparing the Material for Insulation Film
Inventor: KAKINOKI KATSUYUKI
IPC: H01B3/42
Filed: 2001-01-15
Abstract: PURPOSE: A process for producing material useful for forming insulated membrane is provided to obtain an electronic material that does not deteriorate the electric properties of an electronic device. CONSTITUTION: In the process, curable composition containing (A) inorganic or organic high molecular compound and (B) organic solvent is treated by a filter material on which a zeta potential is applied. The filter material comprises a material selected from cotton, pulp, cellulose, diatomaceous earth, pearlite, activator and zeolite, to which is added cationic charge control agent. The composition further contains (C) compounds having a boiling point or decomposition point of 250-450deg.C, (D) compounds having a boiling point or decomposition point of exceeding 450deg.C, and (E) surfactant.
Patent KR-20020061775-A (KR)
Title: Electron gun for cathode ray tube
Inventor: YOON JUNG MIN
IPC: H01J29/48
Filed: 2001-01-17
Abstract: PURPOSE: An electron gun of a cathode ray tube is provided to maximize usage efficiency of magnetic field generated by an SVM(scanning velocity modulation) coil and avoid focus deterioration due to external electric field. CONSTITUTION: An electron gun of a cathode ray tube comprises a cathode(10) for electron emission, a first to a fifth electrodes(G1-G5) for controlling an electron beam from the cathode(10), a bead glass(12) for in-line arranging the electrodes(G1-G5), and an SVM coil(16) arranged outside a neck(14). The fourth electrode(G4) acts as a focus electrode and constituted by a first and a second separate electrodes(G4-1,G4-2) for forming a gap(g1) through which magnetic field from the SVM coil(16) passes. The first and the second electrodes(G4-1,G4-2) are electrically coupled to each other by a shield electrode(G4-3). The shield electrode(G4-3) is formed as a cylindrical ceramic electrode surrounding the gap(g1) and provided with a conductive film(18) at its inner surface.