baber/WOPTO huggingface dataset:
Patent KR-20010097410-A (KR)
Title: 고체 표면, 기판 및 반도체 제조 장치의 처리 방법 및이들을 이용한 반도체 장치의 제조 방법
Filed: 2000-04-22
Abstract: 루테늄이나 오스뮴 및 이들의 산화물을, 간편하고 또한 고속으로, 또한 웨이퍼나 장치에의 손상을 주지 않고 에칭 처리를 실현한다. 
     그 때문에, 상기된 금속 및 그 산화물에 대해 오존으로 대표되는 산소 원자공여성 가스를 공급함으로써, 상기 금속 및 그 산화물과 오존과의 촉매 반응을 이용하여 에칭 처리를 행할 수 있다.  이 반응을 에칭뿐만 아니라, 챔버 클리닝에 적용함으로써, 장치를 안정적으로 가동시킬 뿐만 아니라, 고품질의 디바이스 생산을 가능하게 한다.
Patent KR-20010014812-A (KR)
Inventor: KANAZAWA KENICHI
IPC: H01L27/108
Filed: 2000-04-24
Abstract: PURPOSE: Disclosed is a high integration, high performance semiconductor memory where the transistor in a logic circuit is provided with metal silicide by applying both silicidation of the source-drain of a transistor in the peripheral circuit area and self-alignment technology of BLC(borderless contact technology) or SAC(self-align contact technology). CONSTITUTION: After a memory cell area of silicon nitride for SAC is formed with such a thickness as not filling the gap between gate electrodes, a silicon oxide film is formed with such a thickness as filling the gap between gate electrodes. Sidewall of the silicon oxide film is then formed on the side face only of the gate electrode in the peripheral circuit area and a metal silicide(21) is formed on the exposed surface of the substrate. Subsequently, a silicon nitride film(15) for BLC is formed on the entire surface and contact holes(18),(19) are made while being self-aligned using a silicon nitride film for SAC and the silicon nitride film(15) for BLC.
Patent KR-20000037484-A (KR)
Inventor: KIM SEONG HYEON
IPC: B66C15/00
Filed: 2000-04-27
Abstract: PURPOSE: A safety system for an operator of a tower crane is provided to make the operator get on/off the tower crane safely by preventing a fall and reducing the weight of the operator. CONSTITUTION: A hook unit(60) is mounted outside a horizontal support stand to be parallel with a pulley. A safety rope(80) is installed to prevent an operator from falling to die by driving a lock unit(120). That is, the lock unit is mounted to prevent the safety rope from being released any longer at a higher speed than regular one, and the safety rope is connected with the hook unit to secure the double safety system.
Patent KR-20010105757-A (KR)
Title: Expressive method for badness of a semiconductor package and thereby the semiconductor package
Inventor: HWANG SIN TAE
IPC: H01L23/00
Filed: 2000-05-18
Abstract: An IrDA modulation/demodulation integrated circuit device mounted on a portable telephone set. The integrated circuit device generates a clock by converting the frequency of the clock used by a baseband integrated circuit device which processes baseband signals by means of a PLL circuit (5) by inputting the clock. Therefore, the cost of the portable telephone set can be reduced, because the number of oscillators mounted on the telephone set can be reduced. In addition, the area of the substrate of the integrated circuit device can also be reduced.
Patent KR-20010105980-A (KR)
Title: Lottery-type Advertisement System and the Method on Internet
Inventor: SHIN SANG JUN
Filed: 2000-05-19
Abstract: Tablets which contain phosphate-binding polymers having an average particle size of 400 mum or less, containing particles of 500 mum or less in particle size at a ratio of at least 90 % and showing a moisture content of 1 to 14 % and crystalline cellulose and/or hydroxypropylcellulose with a low degree of substitution; and a process for producing the same. These tablets have a high active component content and an excellent ability to bind to phosphates and are quickly disintegrated in an acidic to neutral region while being little affected by stirring strength. Thus, they are excellent preparations capable of lessening changes in bioavailability depending on pH value.
Patent KR-20000054118-A (KR)
Inventor: SO KWANG HUI
IPC: B01D39/00
Filed: 2000-05-23
Abstract: PURPOSE: A composition for a conductive roller and a conductive filter plate is provided which obtains good dehydration efficiency with small power. CONSTITUTION: In the composition which is formed as a sheet and is adhered to a stainless roller or a filter plate to form a conductive roller or a conductive filter plate, the composition comprises either 20 grams of polyol, 80 grams of lead dioxide and 10 grams of isocyanate or 100 grams of polyol, 20 grams of DMF and 80 grams of lead dioxide.
Patent KR-20010000130-A (KR)
Inventor: PARK JAE DON
IPC: H03L7/187
Filed: 2000-05-30
Abstract: PURPOSE: A dual-band VCO(voltage controlled oscillator) for application of PCS/IMT-2000(personal communication system/international mobile telecommunication system) with a variable resonator is provided to reduce the entire size of a circuit by outputting dual-band frequency variably through a single variable resonator and an oscillator depending on turning-on/off of a transistor. CONSTITUTION: A diode is turned off by a low-level switching signal of a dual-band frequency selector(40). A variable resonator(10) generates resonance frequency by a first frequency band decided by the other components(C1,C4-6,L1) except a second capacitor(C2). An oscillator(20) generates negative resistance and the first frequency band starts to oscillate when a first transistor(Q1) is turned on. An amplifier(30) amplifies the signal and matches impedance through capacitors(C11,C12). In a high-level switching signal of the dual-band frequency selector(40), the variable resonator(10) adds the second capacitor(C2) parallel to the first(C1) and generates the resonance frequency. The resonance frequency is lower than the first frequency band on turning-off of the diode. Therefore, the oscillator(20) and amplifier(30) output a second frequency band.
Patent KR-20000054392-A (KR)
Inventor: LEE MYONG SOO
IPC: G06Q50/34
Filed: 2000-06-03
Abstract: PURPOSE: A method for operating betting to provide a dividend rate in real time is provided to display the present conditions so that members who participate in an internet betting game can make a maximum dividend rate. CONSTITUTION: After a member(10) selects a game event among the events provided in a web server(20), the member(10) selects an associated game in the selected event through a game database(24) and confirms the betting conditions of other members to carry out his betting. Checking the betting conditions of other members, the member(10) bets on a desired team(50-150). After the game, the member(10) reads his betting result of the game and checks the present conditions of his profit rate and dividend. The total betted amount, an amount allocated to his selected team and a dividend rate he can receive are displayed through the present conditions of betting in real time.
Patent KR-20010111150-A (KR)
Inventor: YOON BYEONG MUN
Filed: 2000-06-08
Abstract: 본 발명은 오수슬러지의 건조장치에 관한것으로 건조로를 이중으로하여 로통외부에 공기도입관을 씌워 공기도입로를 형성시킨 건조로 내벽에 스크류돌 스픈형안내편을 다수 고정설치하여 건조재료 슬러지의 이동, 돌입과 분산, 분리가 잘 이루어지게하고 건조로 중간에는 +자형 금망판장치가 지지대의 중심부에 착탈가능하게 삽입설치하여 건조재료의 이송분리 및 금망판에 걸러져서 건조가 효율적으로 되게하고 그 앞쪽에 고속회전의 파쇄장치를 설비하여 건조재료도입과 동시 파쇄시켜 더욱 건조가 잘 이루어지도록하고 또한 건조재료인 슬러지의 운송도입을 용이하게하기 위하여 트럭하차통 밑에 리본스크류콤베어로서 트럭하차통에 주입된 슬러지를 앵글콤베어에 이송하고 또 벨트이송콤베어로서 슬러지저장통에 저장시킨 건조재료슬러지는 리본스크류콤베어로서 슬러지주입통에 원활히 도입하게하고, 건조로(1)의 분진, 유해까스를 제거하기 위하여 각각 1차분진집진기, 소각기, 2차분진집진기, 수분제거기, 여과기와 1차까스이송관, 2차까스이송관, 3차까스이송관, 4차까스이송관으로 까스배기 및 슬러지주입통에 연결설치하여 배기되는 분진 및 유해까스를 정화 제거시켜 청정공기를 배출케하고 또 소각기내의 열교환기에서 순수온열을 로통내로 유입시켜 건조효율을 향상시키도록한 발명이다.
Patent KR-20000054621-A (KR)
Inventor: KANG YONG JAE
Filed: 2000-06-14
Abstract: PURPOSE: A financial transaction system and method utilizing a computer and a video conference system is provided to overcome the restriction to time and space, solve all problems occurred in financial transactions, such as productivity increase of a bank, identification, an erroneous recognition prevention, and improve an on-line banking service for a customer by cost reduction by performing a remote financial transaction using a computer, its auxiliary equipment and a network communication method. CONSTITUTION: A financial transaction system and method utilizing a computer and a video conference system includes the following units. A remote customer terminal(11) allows a customer to transmit/receive images and voice messages to/from a bank-teller terminal(13) and request a financial transaction, and outputs the corresponding response message on a screen. A relay server system(12) stores data transmitted/received between the remote customer terminal(11) and the bank-teller terminal(13) and connects the remote customer terminal(11) and the bank-teller terminal(13) via a network. A bank-teller terminal(13) transmits/receives images and voice messages to/from the remote customer terminal(11) via the relay server system(12) and transmits/receives data to/from the relay server system(12).
Patent KR-20010113311-A (KR)
Inventor: LIM WAN GEUN
Filed: 2000-06-19
Abstract: 본 발명은 기업 매니지먼트 입주단지용 홈페이지 시스템 및 그 시스템의 검색방법에 관한 것으로, 더 상세하게는 인터넷 홈페이지를 이용하여 기업이 주식회사로 창업 상장하고 성공적으로 경영을 해나가는데 도움을 주는 기업 성장을 위한 컨설팅 및 커뮤니케이션(Cummunication) 시스템 및 그 시스템을 쉽게 검색할 수 있는 기업 매니지먼트 입주단지용 홈페이지 시스템 및 그 시스템의 검색방법에 관한 것으로, 
     메인단지, 기업입주단지, 컨설팅단지, 투자자단지가 3차원 가상 공간상의 빌딩내 입주형태로 존재하고 상기 각 단지는 각각의 해당 데이터베이스와 연결되되: 
     상기 메인단지는 공지사항, 핫뉴스, 시스템소개, 회의실 등의 내용이 3차원 형태로 제공되는 종합안내센터와, 뉴스, 공시, 도서정보, 주식정보 등을 제공하는 정보센터와, 기업 데이터베이스의 기업제품정보를 이용하여 3차원 쇼핑몰형태로 운영되는 쇼핑센터와, 3차원 교육센터 내부로 진입하여 교육자료 데이터베이스를 통하여 인터넷 스트리밍 영상교육을 실시하는 교육센터로 구성되고, 
     상기 투자자단지, 컨설팅단지, 기업군단지는 해당 데이터베이스를 통하여 빌딩 구조의 각각 정해진 층과 사무실에 입주되며 방문자가 정해진 사무실을 쉽게 찾을 수 있도록 모델링 구조로 이루어짐을 특징으로 하는 기업 매니지먼트 입주단지용 홈페이지 시스템이다.
Patent KR-20020000244-A (KR)
Title: Apparatus for injecting inert gas into electric furnace
Inventor: WEE HEUNG DEOK
IPC: F27B3/10
Filed: 2000-06-21
Abstract: PURPOSE: An apparatus for injecting inert gas in an electric furnace is provided which guides stirring of molten steel and removes constituent segregation and temperature deviation of the molten steel accordingly by injecting an inert gas deep into molten steel of the electric furnace through a gas injection hole of the electrode rod during smelting operation of the electric furnace by the electrode rod. CONSTITUTION: The apparatus for injecting inert gas in an electric furnace comprises an electrode rod(8) along the central axis of which a gas injection hole(7) is formed, wherein a guiding groove(8-1) is formed at the entrance side of the gas injection hole(7); a fixing body(10) which is fixed to an electrode arm(6), and to vertical beams(10-1) of which rack gears(11) are adhered; an ascent and descent body which is installed so that it is placed between the vertical beams(10-1), wherein gears(32,32-1) which are in gear with the rack gears(11) are driven when a motor(31) is operated, and vertical movements of the ascent and descent body are guided by a guide block(33) enveloping the vertical beams(10-1); a cover arm which is coupled to the upper side of the ascent and descent body so that the cover arm is rotated by a cylinder(34), and at the upper side of which a cover plate(20) is formed; a gas injection line which penetrates the center of the cover plate(20) as it is being connected to a gas supply line(22) by a flexible pipe, and at the front side of which a valve hole is formed; and a gas injection valve(15) which is installed at the front side of the gas injection line so that the gas valve hole is opened when a nozzle tip of the gas injection line together with a valve link tube are elastically reversed as the nozzle tip is being pressed down on the upper surface of the gas injection hole(7).
Patent KR-20020001190-A (KR)
Title: Apparatus for extended firewall protecting internal resources in network system
Inventor: LEE SANG U
IPC: H04L29/06
Filed: 2000-06-27
Abstract: PURPOSE: A security system having a reinforced protection function for internal resources in networks and an operating method thereof are provided to monitor and trace an external leakage of internal resources as an FTP(File Transfer Protocol) proxy monitors internal client's FTP service usage status and executes real-time monitoring for the copy storage and transmission information of the data being transmitted to the external. CONSTITUTION: An FTP proxy, receiving an FTP service access request for an external network from an internal network user, determines whether the user has the authority to access the external network(ST11). If the access authority for the external network is authenticated for the user, the user attempts access to an FTP server(ST13). In case that the internal network user attempts access to the FTP server with an anonymous account, access is granted to him without any special access control operation. However, in the case that the user attempts access with a specific account, the FTP proxy confirms whether it is an access request from a client granted to the specific account and executes access control(ST15).
Patent KR-20010007587-A (KR)
Inventor: GEORGE JOHN BARRET
IPC: H04N9/28
Filed: 2000-06-29
Abstract: PURPOSE: An optical sensor signal current detector is provided to eliminate mismatching of detection by providing a constitution, where the current supplied from a current source is branched in accordance with a first ratio and supplied to a detector to show an illumination off state when no illumination is secured via a trace image, the current is supplied from the current source in accordance with a second ratio with dependence on the illumination intensity defined by the trace image put on a current sink and the detector, where no current is supplied shows an illumination on state. CONSTITUTION: A reference current(Iref) is supplied to a photosensitive sensor(S1) and a sensor detector(275). When the sensor(S1) is not illuminated, the sensor(S1) shows a high impedance and branches a slight current(Isen) out of the current(Iref). Most of the current(Iref) is supplied to the detector(275) as a current(Isw). The current(Isw) biases the detector(275) to set the output state at a low level. The state shows that no light is emitted to the sensor(S1), i.e., the sensor(S1) is not illuminated. When the sensor(S1) is illuminated, the current(Isw) is branched out of the detector( 275).
Patent KR-20020002042-A (KR)
Title: device for controlling the supply of gas in kiln
Inventor: KIM GUK JIN
IPC: F27B9/40
Filed: 2000-06-29
Abstract: PURPOSE: A gas supply controlling device of a lime kiln is provided to automatically control a diameter of a nozzle hole controlling pressure of a cork oven gas and to maintain specific pressure of gas supplied into a furnace. CONSTITUTION: A gas supply controlling device for a lime kiln comprises a body unit(10) having a hollow outer pipe(11); a socket(12) connected to a nozzle pipe; a sealing pipe(31) of a hollow shape penetrating plural holes on a peripheral face; a nozzle unit(30) having an inner pipe(32); plural nozzle hole(35) penetrated on the inner pipe of the nozzle unit; a control unit(50) operating a positioner(52) connected to the inner pipe; a nozzle pipe(218) connected to plural burners; upper and lower flanges(11a,11b) mounted on the body unit; a bolt unit(12a) removing the nozzle pipe from the peripheral face of the socket; a connecting pipe(18a) mounted on the outer pipe; a flange(19a) formed on a mixed gas pipe(19); and lime kilns mounted on an outer face of the outer pipe.
Patent KR-20020003765-A (KR)
Title: Shank for portable spot welding machine
Inventor: JUN SEON GYU
IPC: B23K11/10
Filed: 2000-07-03
Abstract: PURPOSE: A shank for a portable spot welder is provided which easily separates the tip from a shank for replacement in case that a tip is worn and its shape is deformed due to high temperature and pressure generated when performing the welding operation using a portable spot welder. CONSTITUTION: In a shank for a portable spot welder comprising a joint part(112) formed on the one side part of a body(110), wherein the joint part(112) is jointed to a welder body; and an installation part(111) formed on the other side part of the body(110), wherein a tip(120) is inserted into the installation part(111), the shank further comprises a stainless bush(130) coupled to the body(110), wherein a clamp(131) is rotationally installed at the one side part of the stainless bush(130) around a hinge(131a); and a thrust nut(132) installed at the outer side of the stainless bush(130), wherein the thrust nut(132) rotates the clamp(131) by moving one side to the other side, wherein a catching protrusion(121) is projectingly formed on the outer one side part of the tip(120), the catching protrusion(121) is attached to or detached from the clamp(131), wherein a male screw is formed on the outer surface of the stainless bush(130), the male screw is in gear with a female screw formed on the thrust nut(132), and wherein a taper part(132a) is formed on the one side part of the thrust nut(132), the other side part of the clamp(131) is moved to the lower part of the shank so that the clamp(131) is coupled to the catching protrusion(121) as the taper part(132a) is being inserted into the one side part of the clamp(131) when the thrust nut(132) is moved to the one side part of the stainless bush(130).
Patent KR-20010069226-A (KR)
Title: Still and moving picture advertising apparatus and electronic commerce intermediary system and method using the advertising apparatus
Inventor: CHO SEONG MOK
Filed: 2000-07-12
Abstract: PURPOSE: A still image moving image advertising device and an electronic commercial transaction mediating system and method using the device are provided to be managed easily and to enhance advertisement effects and to activate an electronic commercial transaction. CONSTITUTION: A power source(11) is provided for supplying a power source of an advertisement device. A plurality of output units(130¯139) are provided for outputting an advertisement. A wire/wireless unit(120) demodulates and outputs information being received through in wire or wireless and modulates a plurality of information and outputs the information in wire or wireless. A storing unit(140) stores a plurality of advertisement data including a commercial advertisement and convenience information and public information data, advertisement composition data and state information data of an advertisement device. A control unit(100) controls a general operation of the advertisement device and selects and outputs specific data out of a plurality of advertisement data stored in the storing unit(140) in accordance with the advertisement composition data and performs a process by wireless data received through the wire/wireless unit(120) and transmits a responding message and state information.
Patent KR-20010110952-A (KR)
Inventor: KO SEUNG JAE
Filed: 2000-07-21
Abstract: 본 발명은 시계 케이스 및 그 제조방법에 관한 것으로, 그 목적은 금으로 이루어지는 케이스본체와 하부덮개의 내주면에 스테인레스 스틸재 또는 기타 재질로 된 별도의 내부링(Sus-Ring)을 일체로 끼워 결합시키는 한편, 시계줄의 양단을 결합하기 위하여 케이스의 양단으로부터 돌설되는 레그를 속이 빈 구조로 개선하므로써 금장(金裝)시계에 관련한 국제규격에 맞는 두께를 유지하면서도 금의 소모량을 현저하게 줄일 수 있도록 하며, 제조원가를 낮추어 경쟁력을 향상시킬 수 있도록 한 것이다. 
     본 발명에 따른 시계 케이스는 중심부에 투시창과 캡핑베젤이 끼워져 결합되는 소정 크기의 관통공이 형성된 일정한 두께의 금으로 된 케이스본체와; 상기 케이스본체의 내주면에 일체로 끼워져 결합되는 일정한 두께를 갖는 금 이외의 재질로 된 제1내부링(Sus-Ring)과; 상기 케이스본체의 양단으로부터 일체로 돌설되게 결합되며, 내부에 공간부가 형성된 구조를 갖는 좌우 한 쌍의 밴드 연결용 레그와; 상기 케이스본체의 하부로부터 끼워져 결합되며 소정 두께의 금으로 된 하부덮개와; 상기 하부덮개의 내주면에 일체로 끼워져 결합되며 일정한 두께의 금 이외의 재질로 된 제2내부링으로 이루어진다. 
     상기한 목적을 달성하기 위하여, 본 발명에 따른 시계 케이스의 제조방법은 일정한 두께를 갖는 금판을 압연하는 단계와; 압연된 금판의 표면에 케이스형태를 드로오잉하는 단계와; 드로오잉에 따라 케이스본체를 타발하고, 유리경 초삭가공하는 단계와; 초삭가공된 케이스본체의 정해진 위치에 레그용접돌기를 돌출가공하는 단계와; 상기 케이스본체의 내주면에 결합되는 제1내부링을 프레스가공하는 단계와; 프레스가공된 제1내부링을 순차적으로 선삭가공하는 단계와; 선삭가공된 내부링을 케이스본체의 내주면에 끼워 결합시키는 단계와; 상기 케이스본체의 정해진 위치에 결합되는 내부가 빈 레그를 가공하는 단계와; 가공된 각 레그를 케이스본체상의 각 용접돌기에 끼워 맞춘 후 용접가공하는 단계와; 상기 케이스본체의 아래쪽에 끼워져 결합되는 하부덮개를 가공하는 단계와; 가공된 하부덮개를 케이스본체의 하부에 끼워 결합하는 단계와; 상기 하부덮개를 포함하는 케이스본체의 외표면이 광택을 띠도록 하기 위하여 표면을 연마하는 단계를 포함한다. 
     본 발명을 적용하면, 금으로 이루어진 케이스본체 및 하부덮개의 내면에 스테인레스 스틸재 또는 기타 재질로 이루어진 내부링이 일체로 끼워져 결합되는 것은 물론, 밴드가 연결되는 레그 또한 내부가 빈 구조로 이루어지기 때문에 국제규격에 맞는 두께를 만족시키면서도 금으로만 이루어진 시계 케이스와 동일한 외양을 갖는 시계 케이스를 제조할 수 있게 된다. 
     또한, 금만을 이용하여 시계 케이스를 제조하는 종래의 경우에 비하여, 금소모량을 현저하게 줄일 수 있게 되며, 상대적으로 제조원가가 낮아지기 때문에 경쟁력을 높일 수 있게 된다.
Patent KR-20020011003-A (KR)
Title: A digital circuit breaker with low power radio communication capability
Inventor: KIM YONG BAE
IPC: H04Q9/00
Filed: 2000-07-31
Abstract: PURPOSE: A digital protection relay with a low output wireless communication method is provided to input an operation setting value of each protection relay in a remote place by wireless and notify abnormal generation cause to a remote supervisor by wireless when the abnormality of a system is generated. CONSTITUTION: An analog signal input unit(15) detects a current of a line supplied to a load through a CT(Current Transformer). An amplifying unit(16) amplifies the detected current signal. A waveform detector(12) detects the amplified current signal. An MCU(Micro Controller Unit)(11) converts a signal inputted from the waveform detector(12) into a digital value, compares the current value with a previously stored reference current value, and generates data associated with an operation state of a relay. An RF(Radio Frequency) module unit(24) perform a frame transmission of the relay operation state data and receives an instruction signal for setting an operation of the relay in a remote place. An output unit(17) outputs a relay driving signal for blocking a load supply power when the current value inputted to the MCU(11) is more than the reference current value. A memory unit(22) stores an intrinsic ID of a protection relay, and stores the relay current value detected in real time and the relay operation setting values received through the RF module unit(24). A display unit(29) displays a current/voltage value of a power supplied to a motor.
Patent KR-20000063785-A (KR)
Inventor: NOH JONG MYUN
IPC: G06Q50/34
Filed: 2000-08-03
Abstract: PURPOSE: An unlimited online lottery is provided to maximize online's simultaneity and variability by allowing the participant to become the host and constantly changing the variable for winning the lottery depending on the frequency and the concentration of the participation(clicks) and to retain the instant lottery property, despite providing the lottery tickets in a number form, by enabling the tickets to be instantly verified without going through the drawing process. CONSTITUTION: An unlimited online lottery is composed of output, input, verification, and payment. A lottery ticket, which displays the click order, is outputted to the participant when the banner advertisement is clicked. The standards for winning the lottery are inputted and the winning status of the appropriate click number(lottery ticket number) is automatically verified. If the participant's numbers are the winning numbers, the lottery prize money is automatically transferred to the participant's cyber account. A verification number is located on the lottery ticket with the click number in order to enable the participant to verify the winning status. A system that automatically transfers the winning prize money to the participant's account despite the participant's failure to verify the winning status is also provided.
Patent KR-20020011813-A (KR)
Title: Method for embodying non-reciprocal optical wavelength filter and the apparatus
Inventor: CHO YUN HUI
IPC: H01S3/00
Filed: 2000-08-04
Abstract: PURPOSE: A method and a system for embodying a non-reciprocal optical wavelength filter are provided to have different periodical characteristics in accordance with propagation direction of a beam by damping reflection beams of respective directions using an optical wavelength filter having different transfer characteristics in both directions. CONSTITUTION: A faraday rotator has a non-reciprocal characteristics. The polarization status of a WDPC(Wavelength Dependent Polarization Converter) is varied in accordance with wavelength. Two birefringent crystals(BC1,BC2) split the polarization of an optical wave into two beams of orthogonal polarization using an anisotropic crystal. An RR(reciprocal rotator) rotates an incident optical wave in accordance with the propagation direction of the incident optical wave.