baber/WOPTO huggingface dataset:
Patent KR-20020055407-A (KR)
Inventor: INOUE MASAFUMI
IPC: C08J3/16
Filed: 2001-12-27
Abstract: PURPOSE: Provided is a method for producing amino resin particles, which can simply provide amino resin particles excellent in tinting strength, brightness, resistances against heat, solvent and chemical, and having substantially uniform(narrow in particles size distribution) amino resin particles. CONSTITUTION: The method comprises the steps of (i) obtaining a reactant which comprises an amino resin precursor obtained by reacting 1.2-3.5 moles of formaldehyde with 1 mole of amino-based compound and has a viscosity of 2 x 10¬-2 to 5.8 x 10¬-2 Pa.s at 95-98 deg.C; (ii) emulsifying the reactant to obtain an emulsion; and (iii) adding a catalyst to the emulsion, and curing the amino resin precursor in the emulsion by dehydrocondensation of methylol radicals of the precursor. The amino-based compound comprises 40 wt% or more of at least one compound selected from the group consisting of benzoguanamine, cyclohexanecarboguanamine, cyclohexenecarboguanamine, and melamine.
Patent KR-20010090714-A (KR)
IPC: F17C1/02
Filed: 1999-08-06
Abstract: 압력 용기는 3차원으로 뻗어있는 매트릭스 구조를 포함한다.  이 매트릭스는 매트릭스의 접촉점에서 상호 결합된 일련의 틈 내부에 보관된 압축된 유체의 압력에 의해 유도된 로딩을 지탱할 때 발생하는 유체 정역학적(3축, 또는 3차원) 장력을 받는다.  유체 불침투 외부 커버링은 매트릭스에 의해 둘러싸여 있고 인접하여 유지된다.  압력 용기는 불규칙적인 형태를 취할 수도 있다.  주요 간선 장치를 포함한, 이동 장치는 유체를 유입하고 방출하기 위해 구비된다.  액체 상태에서 고체 표면 성분은 매트릭스에 장착되고 고체 상태로 바뀌어서, 이 구성 성분을 내부 결합으로 매트릭스에 고정한다.
Patent KR-20010080575-A (KR)
IPC: H01L21/8238
Filed: 2000-09-15
Abstract: 디지털 전자 회로는 액티브 모드와 슬립 모드에서 동작할 수 있다.  전력 차단 트랜지스터는 슬립 모드에서 공급 전류를 차단한다.  회로는 액티브 모드와 슬립 모드 모두에서 저장된 정보를 나타내는 전압을 보유하는 노드를 포함한다.  저장된 정보는 저 및 고 임계 저장 트랜지스터의 제어 전극을 간접적으로 제어한다.  저 임계 저장 트랜지스터와 고 임계 저장 트랜지스터의 주 전류 채널은 노드와 전원 접속 사이에 직렬로 접속된다.  고 임계 저장 트랜지스터의 주 전류 채널은, 만일 필요하다면, 슬립 모드에서 전력 차단 트랜지스터의 주 전류 채널과 병렬로 접속되어 전류를 노드에 제공한다.  누설 전류는 액티브 모드와 슬립 모드 사이에 전력 차단 트랜지스터의 게이트 소스 전압의 극성을 변경함으로써 및/또는 고 임계 트랜지스터의 주 전류 채널을 저 임계 트랜지스터와 전력 차단 트랜지스터의 주 전류 채널 사이의 후속 노드에 접속시킴으로써 감소된다.  일 실시예에서, 트랜지스터는 마스터 슬레이브 플립플롭 내의 슬레이브 저장 셀의 일부이고 저장 셀 내의 인버터는 임계 시간 경로 밖에서 유지된다.
Patent KR-20010099950-A (KR)
Title: 허파용 에어로졸 공급 장치 및 방법
IPC: A61M11/00
Filed: 1999-12-22
Abstract: 본 발명은 사용자의 허파에 치료특성을 갖는 에어로졸 액체를 분배하는 장치 및 방법에 관한 것이다.  소형이면서 편리한 이러한 장치는 에어로졸을 사용자의 입으로 지향시키기 위해 하우징에 출구를 구비하므로써 사용자의 한쪽 손에 파지될 수 있는 크기의 하우징을 포함한다.  상기 하우징은 에어로졸화된 액체를 내장하고 이를 전기유체식 장치에 분배하는 분배시스템과, 상기 액체를 에어로졸화하고 에어로졸을 출구로 분배하는 전기유체식 장치를 포함한다.  상기 전기유체식 장치는 단순확산된 흡입가능한 방울크기 및 속도가 거의 제로에 가까운 에어로졸화된 액체 방울의 운무를 생성한다.  에어로졸화 장치는 팁단부를 구비한 다수의 분무소와, 상기 팁단부의 하부에 있는 다수의 방전전극과, 상기 방전전극의 하부에 위치된 다수의 기준전극을 포함하며; 상기 분무소는 적어도 하나의 팁단부로부터 에어로졸 분무를 형성하도록 충전원과 협력한다.
Patent KR-20020002383-A (KR)
IPC: G06F9/445
Filed: 2000-02-02
Abstract: 스마트 카드등과 같은 자원-제약 장치는 객체지향의, 검증가능한, 플랫폼-독립적인, 타인-세이프 및 포인터-세이프 시퀀스 명령어들을 포함한다.  장치는 또한 가상 머신이 상기 시퀀스 명령어들을 실행할 수 있는 마이크로프로세서상에서 구현된 가상 머신을 포함한다.  각각의 명령어는 연산 코드를 포함하고 각각의 데이터 조작 명령어는 특정 데이터 타입에 대해 특정하다.  응용 프로그램은 자원-제약 장치에 의해 수신되기 이전에 컴퓨터-판독가능한 매체상에 저장될 수 있다.  인터넷을 통해 프로그램에 액세스하고 그것을 스마트 카드에 다운로드하는 것을 포함하는, 응용프로그램을 사용하는 방법이 또한 개시되어 있다.
Patent KR-20020001880-A (KR)
IPC: F04C18/356
Filed: 2001-03-15
Abstract: 밀폐 용기(12) 내에 수납되는 전동기부(14) 및 전동기부(14)의 회전축(16)에 의해 구동되는 상하 실린더(40, 42)를 갖고, 각 실린더 내에서 회전축(16)에 설치한 상하 편심 캠(44, 46)으로 끼워 맞추어지는 상하 롤러(48, 50)를 편심 회전시키는 동시에, 상하 벤(52, 54)에 의해 각 실린더 내를 구획하고, 냉매 가스를 흡입하여 압축하는 저단측 압축부 및 고단측 압축부, 그 사이에 회전축(16)을 삽입 통과하게 하는 내경 구멍(36)을 형성한 중간 구획판(38)을 설치한 내부 중간압 타입의 2 실린더형 2단 압축식 회전 압축기에 있어서, 상부 롤러에 대면하는 중간 구획판의 내경 구멍(36a)의 중심을 회전축의 중심에 대해 상부 벤의 위치를 기준으로 회전축(16)의 회전 방향으로 90 °± 45 °의 위치로 옮기는 동시에, 하부 롤러에 대면하는 중간 구획판의 내경 구멍(36a)의 중심을 회전축(16)의 회전 방향으로 270 °내지 360 °의 위치로 옮겨 설정한다.  이로써, 압력차가 커지는 부위에서의 상하 롤러와 중간 구획판의 겹치는 면적을 넓게 할 수 있어 누출 가스의 양을 감소시켜 체적 효율 및 압축 효율이 향상된다.
Patent KR-20020037730-A (KR)
IPC: C12R1/01
Filed: 2000-06-28
Abstract: 본 발명은 화학식 1의 화합물 및 그의 약학적으로 허용 가능한 염에 관한 것이다.  상기 식에서, R 1 은 수소 원자, C 1 ∼ C 6 를 갖는 알킬 그룹 또는 C 1 ∼ C 6 를 갖는 알콕시 그룹이다; 및 R 2 는 수소원자, C 1 ∼ C 6 를 갖는 알킬 그룹 또는 C 1 ∼ C 6 를 갖는 알콕시 그룹이다.  또한, 본 발명은 화합물을 얻는 공정, 그를 함유하는 조성 및 그들의 치료용도에 관한 것이다.  상기 화합물은 포유 동물의 암 세포주에 대해 월등한 활성을 보인다.
Patent KR-20020075208-A (KR)
Title: Optical disk device
Inventor: OGAWA TOSHIHIRO
IPC: G11B7/125
Filed: 2002-01-11
Abstract: PURPOSE: To provide an optical disk apparatus which can record with a proper recording power on the whole surface of an optical disk, and which can prevent the deterioration of an error rate or jitters. CONSTITUTION: An OPC(optimum power control) control means S16 which makes plural times of recording in a plurality of frames of a prescribed test area by similarly varying the recording power at the time of operating an OPC, which obtains a mean value of reflected light intensity at the same recording power, and which sets the mean value of the reflected light intensity corresponding to the optimum recording power as the optimum reflected light intensity and a recording power varying means S30 which can vary the recording power with a prescribed amount in the direction in which the reflected light intensity becomes the optimum reflected light intensity are provided. Accordingly, the accurate optimum recording power can be set, in which the influence of a surface wobbling of the optical disk and so forth is reduced, and the deterioration of the error rate and the jitters can be prevented.
Patent KR-20030060725-A (KR)
Title: Shore protection block with vegetation foundation
Inventor: SHIN YONG HO
IPC: E02B3/14
Filed: 2002-01-24
Abstract: PURPOSE: A shore protection block with plant habitat is provided to increase structural stability by a porous concrete block and pressed compound earth containing peat, sawdust, paper sludge, rice straw, etc. CONSTITUTION: The process of manufacturing the shore protection block with a plant life habitat is composed of: putting coarse aggregates, cement, water admixtures into a mold to make a porous concrete body(2); mixing and fermenting peat, sawdust, paper sludge and rice straw, then laying the mixture for a plant life habitat. Polishing sand and peat increases permeability and cohesive force, the paper sludge provides nutriment for plants and the saw dust controls the quantity of moisture.
Patent KR-20030065735-A (KR)
Title: The product composition of provement for soil
Inventor: SEO WANG SIK
IPC: C09K17/40
Filed: 2002-01-30
Abstract: PURPOSE: Provided is a soil conditioner composition which recovers inherent fertility in soil, and overcomes an acidification of soil and the damage resulting from impossibility of repeated cultivation. CONSTITUTION: The soil conditioner composition is produced by the method comprising the steps of (i) adding a special enzyme to foodwaste, so as to age the foodwaste, (ii) mixing 10-30 parts by weight of the aged foodwaste, 30-50 parts by weight of dried loess, 1-10 parts by weight of tourmaline powder, 1-10 part by weight of oystershell powder, 1-10 parts by weight of dried chicken powder, 20-40 parts by weight of limestone powder, 10-20 parts by weight of zeolite, 1-10 parts by weight of elvan powder, 1-10 parts by weight of crude drug powder, and 1-10 parts by weight of divalent/trivalent iron solution hydroxide(Fe(OH)2·Fe(OH)3·H2O) to form a mixture, and (iii) drying the mixture at 60-120 deg.C for 120-240 minutes and then grinding the dried mixture.
Patent KR-20020024184-A (KR)
Inventor: KIM DAE JUN
IPC: C02F1/00
Filed: 2002-01-31
Abstract: PURPOSE: A composition for eliminating selectively inorganic nitrogen compounds is provided, which generates chlorine dioxide having strong oxidative capacity within a range of pH 9.0 to 13.0. CONSTITUTION: The composition for eliminating selectively inorganic nitrogen compounds comprises 4.5-6.5wt.% of sodium hypochlorite(NaOCl), 5.6-8.0wt.% of sodium chlorite(NaClO2), 1.5-2.5wt.% of sodium carbonate, 2.5-3.5wt.% of sodium bicarbonate, 2.5-3.5wt.% of anhydrous sodium sulfate, 76-83.4wt.% of water. In the composition, the amount of available chlorine of sodium hypochlorite is 12wt.% and the purity of sodium chlorite is 35wt.%.
Patent KR-20030065226-A (KR)
Title: System for providing user request service by environment context recognition and method thereof
Inventor: AHN TAE HYEONG
IPC: H04L12/40
Filed: 2002-01-31
Abstract: PURPOSE: A system and method for providing a user requested service through an environment context recognition are provided to offer an optimum service to a user by recognizing an environment of the user. CONSTITUTION: An environment context collecting unit(30) stores user information of a user who uses a user terminal(40) and environment information by periodically sensing a current environment of the user terminal(40). A service managing unit(20) connected to the user terminal(40) through a user interface(10) is connected to each service providing unit through a communication network. The user interface(10) is connected to both the user terminal(40) and to the service managing unit(20) through a communication network. The user interface(10) displays information about service providing units transmitted from the service managing unit(20) on the user terminal(40), so that the user can select a desired service providing unit. A lookup service unit(22) of the service managing unit(20) stores information about the service providing units such as printers(50,52) and an air-conditioner(54) connected through a communication network. A service selector(24) stores load state of the service providing units connected through a communication network.
Patent KR-20020024220-A (KR)
Inventor: CHOI EUN JUNG
IPC: A44C11/00
Filed: 2002-02-05
Abstract: PURPOSE: A decorative chain is provided to enable the chain to function as an accessory by itself, and to enable a user to freely change the shape of the chain by simply manipulating a body of the chain. CONSTITUTION: In the decorative chain made of a chain body(3), the chain body is formed by attaching ball chains(1') composed by connecting various shapes of elements into a linear form in a constant region of both corners of a net member(2) and into a wave form in the remaining region, and the ball chain becomes projected and twisted in a spiral form as the chain body is twisted so that the ball chains attached to the both corners are attached each other. The net member also is formed by connecting various shape of elements.
Patent KR-20030066940-A (KR)
Title: System and Method for Providing Personalized Multimedia Contents
Inventor: HONG JONG CHEOL
IPC: G06F17/00
Filed: 2002-02-06
Abstract: PURPOSE: A method and a system for offering the multimedia contents applying a personal characteristic are provided to make other clients know the client having the multimedia contents by extracting the characteristic information through an event to reflect the characteristic of the client, and offering the multimedia contents differentiated by a level to the client. CONSTITUTION: An event controller(105) offers the event to the client(155) connected through the wire/wireless Internet, and connects the client with a personal characteristic processor(115). An event database(110) includes the information for the event. The personal characteristic processor(115) analyzes the personal characteristic information obtained through the event, and comprises a characteristic extracting part(120), a characteristic confirming part(125), a level list generator(130), a characteristic item providing part(135), a level list database(140), a characteristic item database(145). A multimedia contents applying part(150) applies the multimedia contents to the client(155) by matching the characteristic item with the multimedia contents of the client(155).
Patent KR-20030069443-A (KR)
Title: Monascus purpureus KLHS4 having high pigment productivity
Inventor: HAN GAP JIN
IPC: C12N1/14
Filed: 2002-02-20
Abstract: PURPOSE: Provided is a microorganism Monascus purpureus KLHS4 having high pigment productivity, which produces a large amount of hong gook pigment and antibiotics. CONSTITUTION: A microorganism Monascus purpureus KLHS4(KCTC 18097P) having high pigment productivity is provided, wherein the microorganism is isolated by analysis of the color precipitation level in a Monascus sp. cultured solid medium and selecting a Monascus sp. strain showing the excellent hong gook pigment productivity. A process for producing the hong gook pigment comprises the steps of: (1) culturing Monascus purpureus KLHS4(KCTC 18097P) in a potato-sugar solid or liquid medium at 25 to 30 deg. C, preferably 28 deg. C for 10 to 20 days; and (2) extracting the cultured solid or liquid medium with methanol, wherein the solid medium is pulverized prior to the extraction; and the liquid medium is filtered and the supernatant thereof is extracted with methanol.
Patent KR-20030070213-A (KR)
Title: Secure Webmail Sever System for providing function of isolating key management and encode/decode of mail and method thereof
Inventor: YOO BYEONG SEON
IPC: H04L9/08
Filed: 2002-02-21
Abstract: PURPOSE: A secure web mail server system for separating a mail encoding/decoding part from a key management part and a method for the same are provided to enhance the efficiency by separating a mail encoding/decoding process from a key management process. CONSTITUTION: A secure web mail server system for separating a mail encoding/decoding part from a key management part includes a network(10), an user computer(20), and a secure web mail server(30). The network is connected to a plurality of communication lines. The user computer stores a client program for encoding/decoding a mail to a predetermined storage unit, transmits a key/certificate request signal to the outside, receives the requested key/certificate from the outside, and encodes or decodes the mail by using the key/certificate. The secure web mail server includes a web server(31), a client module(32), a key/certificate manager(33), and a database(34). The web server is used for receiving general mail data and secure mail data. The client module is used for transmitting the client program to the user computer. The key/certificate manager is used for transmitting the key/certificate to the user computer. The database is used for storing the key/certificate.
Patent KR-20030070373-A (KR)
Title: Ashing apparatus having door structure for semiconductor manufacturing
Inventor: CHO CHEOL HAN
IPC: H01L21/3065
Filed: 2002-02-25
Abstract: PURPOSE: An ashing apparatus with an improved door structure for fabricating a semiconductor is provided to shorten an interval of vacuum set time and to prevent a vacuum error by making a door closely attached to a chamber within a short interval of time. CONSTITUTION: A predetermined space for performing an ashing process is formed in a process chamber(11). An upward and downward driving door(23) is vertically transferred by the first driver unit(21) to open or close an opening(11a) through which a wafer is loaded or unloaded, installed in a side of the process chamber. A forward and backward driving door(25) moves up and down according to the operation of the upward and downward driving door. The forward and backward driving door is driven forward and backward by the second driver unit(27) when located in the position of the opening to be closely attached to the outer wall of the process chamber including the opening.
Patent KR-20030070768-A (KR)
Title: PREPARATION OF N-(4-t-BUTYLBENZYL)-N-METHYL-1-NAPHTHYLMETHYLAMINE HYDROCHLORIDE AND PURIFICATION THEREOF
Inventor: CHO SEUNG U
IPC: C07C209/06
Filed: 2002-02-26
Abstract: PURPOSE: Provided is a synthetic method of preparing an anti-bacterial compound, N-(4-t-butyl benzyl)-n-methyl-1-naphthyl methyl amine hydrochloride represented by formula 1, economically and purifying without loss by suspension treatment. CONSTITUTION: The preparation method comprises steps of: making secondary amine derivative of formula 4 by reacting a compound of formula 3 with methylamine group; making tertiary amine derivative of formula 2 by introducing 4-(t-butyl)benzyl group to the secondary amine derivative of formula 4; converting the tertiary amine derivative of formula 2 into hydrochloride of formula 1; and purifying it if necessary.
Patent KR-20030076907-A (KR)
Title: Method of producing a high-resolution spatial light modulator by reconstructing the beam projector and a spatial light modulator with the method
Inventor: KIM MIN GYU
IPC: G02F1/015
Filed: 2002-03-23
Abstract: PURPOSE:A method for manufacturing a high resolution spatial light modulator by reorganizing a beam projector and a spatial light modulator using the same are provided to process an image in a high resolution at a low cost. CONSTITUTION:Components of a beam projector are detected(s10). An optical module for projecting an optical signal is removed from the components of the beam projector(s12). A lamp unit emitting the optical signal is removed from the components of the beam projector(s14). A cooling fan is removed from the components of the beam projector(s16). A power compensating unit is installed to control power source for maintaining the original operating state(s18). A display copper wire connecting a main board with a display for processing light information of a spatial light modulator is installed in an appropriate length(s20).
Patent KR-20020036812-A (KR)
Inventor: KIM GYO HONG
IPC: A01G31/00
Filed: 2002-03-29
Abstract: PURPOSE: A process of growing bean sprouts by grinding a pine needle, mixing water and then soaking bean seeds in the pine needle power solution is provided. Whereby, the bean sprouts have characteristic flavor and taste and are rich in nutrient. CONSTITUTION: A pine needle is dried in the shade, ground and mixed with water. A given weight of bean seed is soaked in the pine needle solution for 1 hr and dried. This procedure is repeated 5 times and thereby, the color of bean seed is changed from yellow to dark blue. The bean seed is then sprayed with underground water 5 to 6 times per day.
Patent KR-20030082670-A (KR)
Title: Home network system and method using mobile network
Inventor: LEE HYEONG HUI
IPC: H04W84/16
Filed: 2002-04-18
Abstract: PURPOSE: A home network system using a wireless communication network and a method therefor are provided to easily adjust various HA(Home Automation) devices in a remote place by integrating a wireless home gateway and an HA function and constructing a home network. CONSTITUTION: If a visitor pushes a calling button during absence, a door phone(100) performs a voice or video call with a mobile communication terminal(160) or a PDA(Personal Digital Assistant)(165). A home gateway(110) interworks with the door phone(100), processes voice and video data between an external object and the visitor, and transmits the processed voice and video data to the mobile communication terminal(160) or the PDA(165). A premises communication network(120) composes a premises network with the home gateway(110). A middleware(130) composes a network with the premises communication network(120). An HA device(140) is mutually networked with the home gateway(110) and the middleware(130), and is remotely controlled through an HA controller(145) by the mobile communication terminal(160), the PDA(165), and a PC(190). A wireless communication network(150) transmits voice, video, and emergency calling data transmitted from the home gateway(110), to the mobile communication terminal(160) or the PDA(165). An Internet network(180) transmits character and emergency calling data transmitted from the home gateway(110), to the PC(190) or an SMS(Short Message Service) center(195).
Patent KR-20020084688-A (KR)
Title: Medium temperature refrigerated merchandiser
Inventor: CHIANG ROBERT HONG LEUNG
IPC: F25D19/00
Filed: 2002-04-20
Abstract: PURPOSE: A medium temperature merchandiser is provided to have an improved air flow distribution through the evaporator. CONSTITUTION: The refrigerated merchandiser(100) includes an upright, open-front, insulated cabinet(110) defining a product display area(125) connected in airflow communication with a compartment(120) via an air circulation circuit(112, 114, 116). A high pressure drop evaporator(40) and a plurality of closely spaced fans(70) are disposed within compartment(120). The evaporator(40) is provided with a relatively high fin density heat exchanger coil providing a relatively high air side pressure drop through the evaporator. The increased flow resistance through the evaporator coupled with the plurality of closely spaced fans results in a substantially uniform evaporator outlet temperature profile across the length of the evaporator.
Patent KR-20030085328-A (KR)
Title: Compost Biofilter and Method for Removing Compost Odor Using the Same
Inventor: HONG JI HYUNG
IPC: A61L9/01
Filed: 2002-04-30
Abstract: PURPOSE: Provided are a compost biofilter which comprises the filter filler containing the composted livestock excrements as an effective component and a method for eliminating the malodorous gas generated from the compost equipment using same. CONSTITUTION: The compost biofilter includes a gas inflow part(11) introduce the malodorous gas into the compost biofilter through a gas control valve(10); a cylindrical deodorizing bath(12) which is located on the top of the gas inflow part, and equipped with filter filler(14) containing the composted livestock excrements as an effective component, a manometer(15), and a temperature sensor(16); and a purified gas outflow part(13) which is located on the top of the deodorizing bath and discharges the purified gas outside.
Patent KR-20030085853-A (KR)
Title: Vehicle Brake Fluid Level Sensing and Warning Device
Inventor: KIM HWAN CHEOL
IPC: B60T11/26
Filed: 2002-05-02
Abstract: PURPOSE: A device for sensing and warning the level of a brake liquid in a vehicle is provided to improve the performance, to reduce the length of processes and the number of parts, and to reduce the cost and the weight. CONSTITUTION: Vent holes(31) are bored at the same position of partitions(3) in a brake reservoir tank(2) installed to a side of a brake booster. A light-emitting sensor(8) and a light-receiving sensor(9) are installed to the sides of the brake reservoir tank in the same line as the vent holes. A warning light(7) installed to an instrument panel is connected between the light-receiving sensor and a battery in series.
Patent KR-20030092218-A (KR)
Title: Load transporting apparatus
Inventor: JANG JANG WON
IPC: B65G57/00
Filed: 2002-05-29
Abstract: PURPOSE: A device for transporting a load is provided to effectively transport the loads by collecting and successively loading the loads guided at the places different from each other in height. CONSTITUTION: A main body(20) has a plurality of loading parts(22a,22b,22c,22d) into which loads moved from each story are successively loaded. A plurality of support frames(19) are installed at both sides of the loading parts. A plurality of support bars(21) connects the support frames. A guide rod(30) is connected to the main body, and stably guides the loads into the loading parts.
Patent KR-20020092241-A (KR)
Inventor: HIROSHIMA TAKASHI
IPC: H03B5/12
Filed: 2002-05-31
Abstract: PURPOSE: To provide a voltage-controlled oscillator, capable of preventing increases in cost and size of a circuit board and decrease in Q of a resonance circuit or increase in power consumption, using a single device for dealing with plural frequencies, and an electronic device employing the same. CONSTITUTION: A control voltage is applied to one end of a varactor diode VD serving as a capacitive element connected to a resonance circuit, and an output voltage from a direct-current variable voltage source Vs, capable of varying a voltage value stepwise, is applied to the other end of the varactor diode VD via a voltage-dividing circuit 2. In this way, the oscillator can be operated as a local oscillator corresponding to two communication systems. Further, since a switching element is not required to be used, deterioration in performance due to the decrease in Q will not be caused. Still further, power consumption will not increase.