baber/WOPTO huggingface dataset:
Patent KR-20000037922-A (KR)
Title: Telephone set
Inventor: KIM WON SEOK
IPC: H04M11/00
Filed: 1998-12-03
Abstract: PURPOSE: A telephone set is provided to effectively listen to an audio signal without purchasing a high-priced television set or a record player for users' convenience. CONSTITUTION: A communication signal reproducing unit(111) converts a communication signal transmitted from an office line to an audible sound signal. A communication signal output unit(112) converts a voice signal of a user to a communication signal and transmits it to other subscriber through the office line. A private line communication signal exchanging unit(113) wirelessly exchanges the communication signal inputted through the office line and a portable communication device(120). An audio signal input/output unit(114) converts an audio signal output from a television set or an audio set(140). A private communication signal connector(121) reproduces the radio communication signal output from the private communication signal exchanging unit(113) to an audible signal, converts a voice signal of a different user(man2) to a radio communication signal to enable the user(man2) to communicate with a different subscriber(man3) through the private communication signal exchanging unit(113). An audio signal receiving unit(122) converts the radio audio signal output from the audio signal input/output unit(114) to an audible signal.
Patent KR-19990030373-A (KR)
Title: 위생젖가락
Filed: 1998-12-12
Abstract: 본 발명은 우리가 식사를 하는데 있어서 필수적인 젖가락(수저)에 관한 것으로서 더욱 상세하게는 흔히 우리가 사용하는 젓가락을 위생적으로 또한 더욱 감각적으로 디자인하는 방법에 관한 것이다. 
     이를 위하여 본 발명은 우리가 사용하는 젖가락은 일직선 형상으로서 밥상위에 올려 놓게되면 손잡이 부분과 음식을 잡는 부분이 바닥에 균일하게 닿게 되어서 비위생적인면이 있으므로 이를 개량하기 위하여 일직선 형태인 젖가락을 중간에 요철이나 기타 다른 방법으로 형태를 살짝 변경하므로 음식을 잡는 부분이 밥상에 직접 닿지 않게 하는것에 특징이 있다.
Patent KR-20000040576-A (KR)
Title: Apparatus for discriminating elevated way/subway using 3-axis geomagnetic sensor and control method thereof
Inventor: LEE TAE WOO
IPC: G08G1/0968
Filed: 1998-12-18
Abstract: PURPOSE: An apparatus for discriminating elevated way/subway using 3-axis geomagnetic sensor and a control method of the same are provided to precisely match the present position of a vehicle to a map data being displayed through an LCD panel. CONSTITUTION: An apparatus for discriminating elevated way/subway using 3-axis geomagnetic sensor comprises a second GPS receiver(100), a 3-axis geomagnetic sensor(200), a phase discriminator(300), a second vehicle speed sensor(400), a second CD-ROM(500), a second micom(600) and a second LCD panel(700). The GPS receiver(100) receives coordinate data and visual data from a GPS satellite. The sensor(200) detects the phase difference and altitude change of the vehicle to output digital phase difference and altitude change data. The phase discriminator(300) receives the digital phase difference and altitude change data and detects pitch angle data.
Patent KR-20000040916-A (KR)
Title: Automatic controller for pressure supplied to hydraulic cylinder of final finishing mill
Inventor: PARK CHIL MAN
IPC: B21B37/00
Filed: 1998-12-21
Abstract: PURPOSE: An automatic controller for pressure supplied to a hydraulic cylinder of a final finishing mill is provided to secure the stable action of an automatic valve and to automatically control a finishing mill by reducing fluid pressure for the valve. CONSTITUTION: A pressure reduction control unit(30) outputs proper supplied hydraulic pressure(Po) by reducing hydraulic pressure(Ps) of a pump through a pressure reducing valve. An on/off valve of a main pipe(20) is opened, but another valve of a bypass pipe is closed to supply the hydraulic pressure(Po) to a finishing mill. The supplied hydraulic pressure is proper for operating a servo-valve stably to work a solenoid valve of the finishing mill. Thus, the quality of rolling material is enhanced by stabilizing the control of a finishing mill, and the life span of hydraulic units are lengthened by preventing the hydraulic units from being damaged by high pressure.
Patent KR-20000041751-A (KR)
Title: Circuit for delivering negative charge pumping voltage of semiconductor device
Inventor: YUN JEONG HEE
IPC: G11C5/14
Filed: 1998-12-23
Abstract: PURPOSE: A circuit for delivering a negative charge pumping voltage in a semiconductor device is provided to maximize the efficiency of a charge pump by inserting resistance to the drain terminals of each pass transistor. CONSTITUTION: First and second resistance(R1,P2) are connected to the drain terminals of first and second transistors(P21,P22) for reducing the potentials of first and second nodes(K21,K22) lower than a junction breakdown voltage. Moreover, a third resistance(R3) is connected to the drain terminal of a fifth transistor(P25). Thus, the voltage falls sequentially by inserting the resistance to the drain terminals of each pass transistor. Moreover, the charge pump efficiency is maximized by obtaining a lower output voltage than a breakdown voltage of each pass transistor.
Patent KR-20000043099-A (KR)
Title: Method for forming conductive layer line of semiconductor device
Inventor: YOO SUNG HO
IPC: H01L21/28
Filed: 1998-12-28
Abstract: PURPOSE: A method for forming a conductive layer line of a semiconductor device is provided which enables an etching process smooth when forming the conductive layer line using a self-aligned damascene process. CONSTITUTION: A method for forming a conductive layer line includes the steps of: forming a first inter level insulation film pattern(200') having a contact hole on a first conductive layer(100) on a semiconductor substrate; depositing a second inter level insulation film(500) on the first inter level insulation film pattern so that void is formed in a contact hole; forming a mask pattern revealing a selected region on the second inter level insulation film; revealing a part of the first conductive layer through an etched region and the contact hole by etching the second inter level insulation film with the mask pattern as an etch mask; and forming a second conductive layer(900) in the etched region and the contact hole.
Patent KR-20000044089-A (KR)
Title: Radiator of vehicle with electrical pre-heater installed for preventing freezing
Inventor: HONG HO SEOK
IPC: F28D1/00
Filed: 1998-12-30
Abstract: PURPOSE: A radiator of vehicle installed an electrical pre-heater for preventing a freezing is provided to normally starting by preventing a freezing and a congelation of cooling water with a convection current according to a pre-heating by inserting a plug in a power of house. CONSTITUTION: An insulating pipe(40) is installed to fix by inserting in a caliber of second hose(34) and a connecting port(64) and a heater(62) are protruded in a heating slot(42) of insulating pipe(40). A contacting piece(50) is penetrated in the second hose(34) and the insulating pipe(40). The contacting pipe(50) is flowed a current because the pipe is connected with the connecting port(64). To prevent a freezing and a congelation of cooling water when a vehicle is parked for a long time in winter or in the coldest season, a plug(74) of electric cord(70) is inserted in an outlet installed in a house. The current is flowed into a jack(72) through the plug(74) and the electric cord(70), and the heater(62) is generated a heat through the connecting port(64) therein by inserting the jack(72) in the contacting piece(50). The cooling water flowed into the second hose(34) is risen a temperature by the generating operation of heater(62) and the coolant risen the temperature is prevented the freezing and the congelation by a convection current.
Patent KR-19990028740-A (KR)
Title: 프로테인 키나아제가 매개하는 질병의 치료와 예방을 위한 신규한 아제판과 그 고리 동족체들
IPC: A61K31/40
Filed: 1996-06-26
Abstract: 하기 화학식 Ⅰ의 화합물, 그리고 이들의 약학적으로 허용가능한 산 부가염은 프로테인 키나아제 저해제이며, 이들은 상기 효소가 매개하는 질병, 예를 들면 염증성 질병 등의 치료에 이용될 수 있다: 
     화학식 Ⅰ 
     
       
     
     상기 식에서, 
     R 1 은 페닐 또는 알파- 또는 베타-나프틸기인데, 이들은 히드록시나 저급 알킬, 저급 알콕시, 저급 알콕시-카르보닐, 페녹시, 아실옥시, 히드록시페녹시-설포닐, 할로겐, 니트로, 아미노, 아실아미노 또는 N-저급 알킬-아실아미노기 등으로 치환될 수 있고; 
     R 2 는 페닐이나, 히드록시나 아실옥시기로 치환된 페닐이며; 
     Y는 탄소-탄소 결합이거나 또는 비닐렌이고; 
     n은 1, 2 또는 3이다.
Patent KR-20000064281-A (KR)
Title: 조망스크린및그제조방법
IPC: G02B3/00
Filed: 1996-12-13
Abstract: 조망스크린용의 필름기판의 한 표면으로 절개되거나 엠보싱된 홈이나 렌즈와 같은 광방향성 수단을 제공함으로써, 광중합반응후에 제거되야만 하는 별도의 마스크를 사용할 필요없이 테이퍼된 도파관이 단량체혼합물층에 의해 제조된다. 또한, 경사진 렌즈배열은 광의 방향을 결정하고 광을 집중하는데 사용되어 단량체혼합물층에 도파관을 형성하게 할 수 있다.
Patent KR-19990077136-A (KR)
IPC: B22D11/06
Filed: 1997-01-08
Abstract: A cooling system for a belt caster including at least one movable belt. The cooling system includes a plurality of rollers and a plurality of nozzles arranged between the rollers to deliver coolant to the belt. The rollers provide a rolling support surface upon which the belt may be supported and are constructed and arranged so that a maximum number of nozzles can be provided to deliver coolant to the belt of the caster. In another embodiment, the cooling system includes a cooling box having (i) a first chamber for receiving coolant from a coolant supply; (ii) supply tubes for delivering coolant from the first chamber to a second chamber defined by a cooling face of the cooling box and the cooling surface of the belt; and (iii) a third chamber for receiving coolant from the second chamber. Associated methods of casting a molten metal into a metal product are also disclosed.
Patent KR-20000064920-A (KR)
Title: 열펌프에서의 제상 제어
IPC: F25B47/02
Filed: 1998-01-20
Abstract: 열펌프 시스템용 제상 제어 장치는 어떤 계산된 조건이 발생할 때 실외 코어의 제상을 개시시킨다.  상기 조건은 실외 코일의 최종 제상 이후로 발생하는 최대 실내 코일 온도와 현재의 실내 코일 온도 사이에 허용될 수 있는 차이에 대한 한계치를 초과하는 것을 포함한다.  초과될 수 없는 상기 한계치는 실외 코일의 최종 제상 이후로 발생하는 최대 실내 코일 온도의 함수로서 계산된다.
Patent KR-20000015891-A (KR)
Title: Method and system for processing signals for use in a wireless communication system
Inventor: WILLEY WILLIAM DANIEL
IPC: H04L1/24
Filed: 1997-03-10
Abstract: PURPOSE: A signal processing method is provided to reduce a hand-off provability and exactly calculate a bit error rate of received data frame. CONSTITUTION: A method of processing a received signal in a wireless communication system (20) comprises the steps of detecting a first digital signal at a first receiver (26), measuring timing parameters of the first digital signal, and sending data associated with the timing parameters to a second receiver (28).
Patent KR-20000015946-A (KR)
Title: Nonflammable/self-extinguishing electrolytes for batteries
Inventor: NARANG SUBHASH C
IPC: H01M10/0566
Filed: 1997-05-22
Abstract: PURPOSE: Novel nonflammable and self-extinguishing fire-retardant electrolyte compositions are provided. CONSTITUTION: The compositions comprises a lithium salt dissolved in a fire-retardant solvent selected from the group consisting of phosphates, phospholanes, cyclophosphazenes, silanes, fluorinated carbonates, fluorinated polyethers and mixtures thereof. The electrolyte composition optionally contains a CO2-generating compound. Also provided are fire-retardant batteries and fire-retardant conductive films formulated with such compositions, as well as methods of manufacturing such films.
Patent KR-19990037773-A (KR)
Title: 바다낚시용찌
Filed: 1999-01-18
Abstract: 본 발명은 바다 낚시용 찌에 관한 것으로, 역광상태에서도 낚시찌의 움직임 확인이 용이하도록 하는 것이다. 
     이러한 본 발명은 바다낚시용 찌에 있어서, 찌의 표면에 투명도료를 일정두께로 도포하고 그 위에 에나멜도료를 도포시킴으로써 이루어지는 것으로, 햇빛이 에나멜도료를 투과하여 투명도료 내에서 난반사되며 햇빛이 비추는 반대방향까지 전달된 후 다시 에나멜도료를 투과하게 되므로써 역광상태에서도 찌의 움직임 확인이 용이하도록 한 것이다.
Patent KR-19990068007-A (KR)
Title: 액체 냉각식 주형
IPC: B22D11/124
Filed: 1999-01-20
Abstract: 얇은 강 슬랩의 연속 주조를 위한 액체 냉각식 주형은 구리 또는 구리 합금과 같은 열 전도도가 높은 재료로 이루어진 주형체를 구비한다.  주형체는 서로 대향된 2개씩의 폭이 넓은 측벽과 연속 주조물의 폭을 한정하는 폭이 좁은 측벽으로 구성되는 것이 바람직하고, 폭이 넓은 측벽은 깔때기형 탕입 구역을 형성한다.  높은 열 응력 및 기계 응력이 걸리는 구리판의 구역에서 균열이 형성되는 것을 방지하기 위해, 특히 탕욕 액면 구역에 높은 면당 열류를 수반하는 냉각 구역이 배치된다.
Patent KR-20000055082-A (KR)
Inventor: BAEK IN SEOP
IPC: A61K8/68
Filed: 1999-02-03
Abstract: PURPOSE: Provided is a cosmetic base of the multi-lamellar emulsion type comprising ceramide-like, designed for delivering sufficient moisture to skin and for keeping the skin wet slightly at all times. Also, it can be capable of lasting for a long time. CONSTITUTION: A cosmetic base of the multi-lamellar emulsion type comprises 0.05-10 wt% of ceramide-like, 0.5-20 wt% of nonionic surfactant and 0.5-20 wt% of cetostearyl alcohol as a principal component, and 0.5-20 wt% of polyhydric alcohol and 0.05-20 wt% of emulsifying agent as an adjuvant. The ceramide-like is represented by formula (1) and (2), wherein R1 and R2 are C6-C22 of branched or linear chain alkyl.
Patent KR-19990072862-A (KR)
Title: Ｆｍ다중방송수신기의동기회로
IPC: G01S19/48
Filed: 1999-02-23
Abstract: 수신국의 전환시, 프레임 동기시의 에러 카운트를 방지한다. 
     데이터 카운터 101 및 102는 국 F1 및 F2의 다중 데이터의 타이밍에 각각 동기하여 카운트하고 있다.  국 F1의 수신 중 데이터 카운터(101)의 출력 C2와 BIC 검출 출력 BP에 의해 블록 동기가 검출된다.  방송국이 F1에서 F2로 전환한 경우, 제어 신호 CONT에 의해 데이터 카운터(102)의 출력 C2가 선택되고, 출력 C2와 출력 BP에 의해 블록 동기가 검출된다.  또한, 출력 C1은 블록 카운터(110)에 항상 입력되기 때문에, 국 F2의 수신 중에서도 미스 카운트하는 일없이 국 F1의 다중 데이터의 프레임 동기가 검출된다.
Patent KR-19990077757-A (KR)
Title: 차량용 글라스안테나 장치
IPC: B60R11/02
Filed: 1999-03-10
Abstract: 본 발명은 차량 글라스안테나 장치에 관한 것으로, 차량용 글라스안테나 장치는 차량의 후면 창유리(2)상에 제공된 단파용 수신안테나로서 FM안테나(3)와 제습기(14), 차량의 후면 창유리와 다른 위치에 고정된 측면 창유리(4)상에 제공되어 중파용 수신안테나로서 AM안테나(5; 18)를 포함한다.  AM안테나는 차량의 후부에 배치된 후면 와이퍼, 정지등 및 깜빡이와 같은 전기장치로부터 상대적으로 멀리 떨어져 위치하기 때문에 전기장치로부터 발생된 소음이 안테나장치의 전송선으로 혼입되기 어렵다.
Patent KR-19990046073-A (KR)
Title: 양란심비디움신품종유에프오칼라식물
IPC: A01H5/00
Filed: 1999-03-17
Abstract: 본 발명은 황색을 가지는 복륜화로서 분화용의 우수한 양란 심비디움 신품종에 속하는 식물 "유에프오 칼라"를 제공하는 뛰어난 효과가 있다.
Patent KR-20000061314-A (KR)
Inventor: OH YEONG NAM
IPC: H04N5/85
Filed: 1999-03-25
Abstract: PURPOSE: A disk manufactured by recording a DVD application on a CD media and a recording and reproducing apparatus and method are provided for implementing a music video or presentation operation which needs a short time reproducing operation using a low cost CD media. CONSTITUTION: As a disk media, a CD, CD-R, or CD-RW(Rewritable) is generally used. A physical media(11) uses a CD-group media. The format of the physical media(11) of the above CD group uses a CD-ROM format. Namely, the format is classified into a CD-ROM format read region(12), a user region(13) and a read-out region(14). Therefore, a control information of the read-in region(21) and the TOC information use the same format as the common CD-ROM format.
Patent KR-20000066892-A (KR)
Inventor: KIM YEONG YUN
IPC: G11B20/10
Filed: 1999-04-21
Abstract: PURPOSE: An optical recording medium for continuously storing data and method for processing fault region store a data pattern for a fault area in an actual physical fault area without using linking system. CONSTITUTION: A recording medium stores a data pattern for a fault area unrelated to an user data in a fault area generated before or during the recording of the user data, and thus continuously records a transport data during the recording of the user data. Also, the recording medium searches the fault area by recording a recording pattern on DID(Data Identifier) area and data area in accordance to a predetermined rule before the recording of the user data, and records a physical sector number on the DID area during the recording of the user data. The recording medium searches the fault area by recording the recording pattern on the DID(Data Identifier) area and the data area in accordance to a predetermined rule before the recording of the user data, and records a logical sector number expect the fault area on the DID area during the recording of the user data. The data pattern for the fault area is a dummy data.
Patent KR-19990087980-A (KR)
Title: 개선된옆가지어페츄어를지니는분지된스텐트와그의제조방법
IPC: A61F2/82
Filed: 1999-04-29
Abstract: 본 발명은 혈관(blood vessel)과 같은 분지된 관(bifurcated vessel)내에 삽입하기 위한 분지된 스텐트(bifurcated stent)에 관한 것이다.   첫 번째 실시태양에서, 첫 번째 박판은 첫 번째 다리로 형성되고, 두 번째 박판은 두 번째 다리로 형성되고, 세 번째 박판은 스템으로 형성되며, 그리고 두 개의 다리는 스템으로 붙여진다.    두 번째 실시태양에서, 첫 번째 박판은 첫 번째 다리와 스템 반을 가지는 멤버로 형성되고, 두 번째 박판은 두 번째 다리와 스템 반을 가지는 멤버로 형성되며, 그리고 두 개의 스템 반(half)은 분지된 스텐트를 형성하기 위해 결합된다.    세 번째 실시태양에서, 스텐트는 처리되기 위한 분지된 위치에 연속적으로 삽입되고 혈관 내에서 조립되는 두 개의 섹션(section)으로 구성된다.
Patent KR-19990088272-A (KR)
Title: 스피커조립체를갖는휴대용전자장치
IPC: H04W88/02
Filed: 1999-05-13
Abstract: 스피커 조립체를 갖는 휴대용 무선전화기(100)와 같은 휴대용 전자 장치가 설명되어 있다.  휴대용 무선전화기(100)는 수신기 및 발신기의 적어도 하나를 갖도록 형상화되고, 상부 하우징(102) 및 하부 하우징(108)을 포함하는 하우징을 갖는다.  스피커(342)는 상부 하우징(102)의 귀 위치부(120)의 전방의 제1 공기층에 음향학적으로 연결된다.  적어도 하나의 제1 통로는 제2 공기층으로부터 사실상 분리된 제3 공기층에 제1 공기층을 음향학적으로 연결한다.
Patent KR-20000073929-A (KR)
Inventor: SON CHANG BIN
IPC: A47K5/122
Filed: 1999-05-15
Abstract: PURPOSE: A device for drawing out a tooth paste is provided to attach the tooth paste to a tooth brush with one hand by simply pushing the tooth brush and drawing out the tooth paste. CONSTITUTION: A pushing stand(11) is pushed and retreated by an end of a tooth brush(14). A switch unit(12) is converted to an on state and a motor(8) is acted. An outside screw unit(7b) is rotated by the action of the motor and an inside screw unit(7a) is forwarded to a storage chamber(3). A mobile partition(2) pressurizes a toothpaste tube(6). Herein, as an opening/closing plate(10) is retreated and an outlet port(6a) is opened, the toothpaste is let out and attached to the tooth brush.
Patent KR-20000074005-A (KR)
Inventor: CHO HYEON DEOK
IPC: H04B7/00
Filed: 1999-05-17
Abstract: PURPOSE: A method of controlling a transmission of image data in a wireless channel is proposed to inform a state of a retransmission buffer to an encoder, thereby transmitting image data in real time without delaying transmission. CONSTITUTION: The method of controlling transmission of image data in a wireless channel comprises the steps of: feeding back a state of a retransmission buffer(210) according to a bit error rate of a wireless channel to an image encoding portion(110); and variably controlling a bit speed on the wireless channel according to the state of the retransmission buffer. In the method, the bit speed on the wireless channel is controlled so that a correspondent image data is transmitted at a lower speed than a predetermined target speed when the retransmission buffer is overloaded. Alternatively, according as the state of the retransmission buffer is fed back to the image encoding portion, the encoding portion received a state information reflecting the state of the retransmission buffer and an output speed of an encoding buffer(120) is controlled by a quantizing parameter provided from the encoding portion.
Patent KR-20010001612-A (KR)
Inventor: CHOI YEONG DEOK
IPC: G07F9/00
Filed: 1999-06-07
Abstract: PURPOSE: A vending machine built-in a wireless communication device is provided to enable a user to purchase products through an external communication device without inserting any cash, to make product purchases more convenient, and to prevent the user from losing his/her money. CONSTITUTION: A vending machine built-in a wireless communication device is composed of determination, storage, display, and execution. A main controller determines whether a data transmission has been made from a wireless reception device. If yes, the received wireless data is stored in the first memory location and the fee amount is displayed on a display device. If no, the main controller determines whether a fee data transmission has been made from a currency identifier. If the transmission has been made, the fee data is stored in the second memory location and displayed on the display device. If there were no transmissions from the currency identifier, the fee is displayed on the display device and the main controller determines whether an appropriate product has been selected. If a product has been selected, the actions for the sales possibility conditions are executed. If a product has not been selected, the main controller determines whether a refund lever has been pressed. If the lever has been pressed, the fee data stored in the second memory location is refunded to the user.
Patent KR-20010001857-A (KR)
Inventor: JUNG JAE U
IPC: B41J2/01
Filed: 1999-06-09
Abstract: PURPOSE: A method for connecting an input line with an ink-jet printer head using flip chip bonding method is provided to connect an input line even in case of the ink-jet printer head having a plurality of nozzles, and to minimize an actuator, thereby enabling high integration of the ink-jet printer head. CONSTITUTION: A method for connecting an input line(43) with an ink-jet printer head using flip chip bonding method includes the steps of forming a bonding pad(44) in the portion to be connected with the input line in an upper electrode(42) of an actuator of the ink-jet printer head, forming a metal for gluing(45) in the top of the bonding pad, melting the metal for gluing by heating at the temperature little higher than the melting point, and connecting the melted metal with the input line, so that the metal is rightly arranged by self-aligning characteristic due to high surface tension of the metal.
Patent KR-20010005220-A (KR)
Inventor: KIM SANG GAP
IPC: G02F1/1362
Filed: 1999-06-30
Abstract: PURPOSE: A board for a liquid crystal display device is provided to reduce contacting resistance between a drain electrode and a pixel electrode, or between a data pad and a pad contacting with the data pad. CONSTITUTION: A board for a liquid crystal display device includes an organic insulating film(30), contacting holes(C1, C2, C3), a drain electrode(320), a gate pad(120), a gate insulating film(20) and a data pad(330). The organic insulating film(30) is exposed at the light and is developed. The contacting holes(C1, C2, C3) are formed, which expose the drain electrode(320), the gate pad(120), the gate insulating film(20) and the data pad(330). The gate insulating film(20) exposed through the contacting hole(C2) is etched and the gate pad(120) is exposed. Some parts of the organic insulating film(30) remain in the contacting holes(C1, C2, C3). The organic insulating film(30), which remains in the contacting holes(C1, C2, C3), is removed by plasma processing with argon gas and surface roughness of the organic insulating film(30) is increased.
Patent KR-20010009076-A (KR)
Inventor: JU HYEONG IL
IPC: H01J29/48
Filed: 1999-07-07
Abstract: PURPOSE: An electron gun for a CRT(Cathode Ray Tube) with electrodes is provided to reduce aberration of electron beams caused by large-diameter holes, to change the sectional area of electron beams to a desired shape and to improve focusing of electron beams by reducing focus voltage difference between electron beams passing the holes. CONSTITUTION: A prefocus lens is formed between a control electrode(52) and a screen electrode(53) while a main lens is between the first and second condensing electrodes(60,70). The main lens forms an electron lens and the electron beams pass through the electron lens as an equipotential surface is formed in a normal direction of an electric force. The electron beams are influenced by different condensing elements through central and both small-diameter holes because of asymmetric large-diameter holes. Central electrodes have long horizontal/diagonal distances to be influenced by a large diffusion force in horizontal/diagonal directions. The focusing of electron beams is reduced by induction of focus voltage difference. However, the electron gun has inlet portions around the small-diameter holes to increase the horizontal diffusion force of electron beams and to compensate condensing/diffusion force difference of a large-diameter lens.