baber/WOPTO huggingface dataset:
Patent KR-20020038477-A (KR)
Inventor: HASUMI TAROH
IPC: H01L21/60
Filed: 2001-11-02
Abstract: PURPOSE: To provide a high degree of reliability of connection even in connections of electrodes of the same form having a more minute area by controlling misregistration of each minute pitch electrode, and controlling unevenness of the capture rate of conductive particles in each unit of the connection electrodes, in ACF connection between leader electrodes having a minute area and conductors for supplying external power source and signals, in a high- definition liquid crystal display device. CONSTITUTION: Dams 35 are formed between adjacent leader wirings 34. These dams 35 are formed in the same process at that of a polymer layer for mounting display electrodes thereon, in a polymer-film-on-array type liquid crystal display.
Patent KR-20020044541-A (KR)
Inventor: HSU LOUIS L
IPC: H01L21/334
Filed: 2001-11-23
Abstract: PURPOSE: A semiconductor device having dual dielectric thickness and a method for manufacturing the same are provided to reduce total device size. CONSTITUTION: A conductive material(34), such as amorphous silicon, polysilicon, or other similar material, is then deposited over the surface of a substrate(10) to substantially fill a support trench. The conductive material(34) is deposited by using conventional LPCVD. Thereafter, the excess conductive material(34) on the surface of the substrate(10) is removed by using planarization techniques, such as a CMP(Chemical Mechanical Polishing). The planarization also removes a thick node dielectric material(32) from the surface of the substrate(10), as well as a thin node dielectric material(28) if not already removed prior to the deposition of the thick node dielectric material(32), and a portion of a pad(12), wherein the pad(12) serves as a polish stop layer. This forms a completed support capacitor(23).
Patent KR-20030046003-A (KR)
Title: Structure for discharging gas in compressor
Inventor: HA JONG HUN
IPC: F04C18/00
Filed: 2001-12-03
Abstract: PURPOSE: A gas discharge structure is provided to prevent efficiency degradation of the refrigerating cycle caused due to the accumulation of the oil in the refrigerating cycle. CONSTITUTION: A compressor comprises a hermetic container(10); a cylinder assembly(D) having an internal space and a suction passage(f1) and a discharge passage communicated to the internal space, wherein the cylinder assembly is coupled to the hermetic container; a rotating shaft(20) having a swash plate, which penetrates through the cylinder assembly in such a manner that the swash plate is disposed in the internal space of the cylinder assembly; and vanes coupled with the cylinder assembly, which convert the first section and the second section of the internal space of the cylinder assembly into a suction area and a compression area. The cylinder assembly has a groove(36) formed at the outer surface of the cylinder assembly and communicated to the discharge passage of the cylinder assembly so as to cooperate with the inner surface of the hermetic container to form an oil filtering space(Q). The cylinder assembly has a through hole(130) for permitting the gas passed through the oil filtering space to exit into the hermetic container.
Patent KR-20030049235-A (KR)
Title: a vibration damping device for shock absorber of vehicles
Inventor: YOON HUI UK
IPC: F16F13/04
Filed: 2001-12-14
Abstract: PURPOSE: A vibration absorbing apparatus of a shock absorber for a vehicle is provided to absorb vibration through the shock absorber by moving the weight in the opposite to vibration of a cylinder with forming magnetic force against vibration between a permanent magnet and an electromagnet. CONSTITUTION: A weight(102) is elastically supported by coil springs(103,106), and installed in a cylinder(10) by a linear bearing(101). A permanent magnet(108) is mounted in a groove(102a) formed in the lower part of the weight. An electromagnet(107) is installed in the end of a supporter rod(105a) of a supporter(105) fixed in the lower part of the cylinder, and placed opposite to the permanent magnet. The electromagnet is connected to a battery through a varistor(111) and a polar converting switch(112), and an acceleration sensor(109) is installed in the supporter. A control unit(110) receives vibration information from the acceleration sensor, and controls the varistor and the polar converting switch. Vibration is absorbed by moving the weight against vibration of the cylinder with forming magnetic force between the permanent magnet and the electromagnet.
Patent KR-20030052684-A (KR)
Title: CDMA Mobile Communication System and Method of Treating Handoff Between Different Network Systems at the CDMA Mobile Communication System
Inventor: SHIN YEONG JONG
IPC: H04W36/14
Filed: 2001-12-21
Abstract: PURPOSE: A CDMA mobile communication system is provided to enable a gateway BTS to use each main frequency as common frequencies, and to make the gateway BTS control a handoff cell using the two common using frequencies, thereby implementing a stable and exact handoff process. CONSTITUTION: BTSs(105,106) wirelessly interface with mobile stations(109,110). BSCs(103,104) control the BTSs(105,106), and process vocoding of voice packets. MSCs(101,102) interpret mobile subscriber numbers, and perform switching processes. A position register(100) is located between the MSCs(101,102), and stores and processes position information for paging mobile subscribers. Only one gateway control station(107) exists between two systems. A gateway BTS(108) installed between the two systems is interfaced with the gateway control station(107).
Patent KR-20030053938-A (KR)
Title: transmission mounting bracket for vehicle
Inventor: CHO YEONG HUN
IPC: B60K17/06
Filed: 2001-12-24
Abstract: PURPOSE: A transmission mounting bracket of a vehicle is provided to improve durability, to minimize vibration and noise caused by the noise of fine vibration in the high-speed rotation of an engine and the influence of a power transmitting system, and accordingly to improve the riding comfort of passengers and the NVH(Noise Vibration Harshness) capacity of the vehicle. CONSTITUTION: A transmission mounting bracket(30) of a vehicle is composed of a floor plate(31) having a plurality of through holes(31a), a pair of side plates(33) integrally bent at both sides of the floor plate, an intermediate plate(34), of which both ends connect the side plates, joined to the floor plate, an inner pipe(35) connecting the side plates protruded out of the floor plate, and a rear plate(36) joined to an end of the floor plate located between the intermediate plate and the inner pipe and both ends of the rear plate connecting the side plates.
Patent KR-20030054736-A (KR)
Title: A Method of Activation/Deactivation of Call Function in Idle State on Mobile Station
Inventor: CHO GWON DO
IPC: H04B1/40
Filed: 2001-12-26
Abstract: PURPOSE: A method for controlling the activation and the deactivation of a call function in an idle wireless communication terminal is provided to cut off a spontaneous registration function and an originating call attempt function, to make an exchange regard the wireless communication terminal to be turned off, thereby deactivating the call function and activating the call function through a reverse process. CONSTITUTION: Information of a key inputted to a wireless communication terminal is analyzed(200). If the information is for a call function deactivation request signal, power down registration is performed to notify a call function deactivation state for a base station(201,202,203). A current value of system parameters in charge of a spontaneous registration function and an originating call request function of the wireless communication terminal is copied and stored in a storage additionally arranged in the wireless communication terminal, and the current value of the system parameters is substituted by a value corresponding to the call function deactivation state(204,205). If the information is for a call function activation request signal, the current value of the system parameters is substituted by the value stored in the storage(206-208). And power up registration is performed to notify a call function activation state for the base station(209,210).
Patent KR-20030057059-A (KR)
Title: A method of fabricating liquid crystal display device without damage of gate pad
Inventor: PARK JAE WON
IPC: G02F1/1333
Filed: 2001-12-28
Abstract: PURPOSE: A method for manufacturing an LCD(Liquid Crystal Display) having a non-breakable gate pad is provided to prevent the defects of a gate pad. CONSTITUTION: A method for manufacturing an LCD having a non-breakable gate pad comprises the steps of forming a pad(110) on a substrate(101), layering at least one layer of inorganic insulating layer(105) on the pad, removing a portion of the inorganic insulating layer by etching except a portion of the inorganic insulating layer on the pad, removing an organic insulating layer(113) layered on the etched inorganic insulating layer, and opening the pad by etching the residual inorganic insulating layer.
Patent KR-20010071823-A (KR)
IPC: A47J37/07
Filed: 1999-07-09
Abstract: A portable gas grill features a combination of quick heat up and quick cool down in a compact and truly portable self contained grill for camping, tailgating, and other activities. The gill includes a lower housing containing a multilayer metal foil insulation/reflector member, a grill surface, a radiant heating element, and a grill cover with a multilayer metal foil insulating/reflector member. The radiant heating element utilized in the gas grill includes a gas jet burner in combination with a heat radiating tube which contains the flame extending from the jet burner. The radiant heat generated by the radiant heating tube heats a grill surface of 170 square in. or greater to adequate grilling temperatures such as 700° F. and higher.
Patent KR-20010072701-A (KR)
Title: 플루오르 함유 화합물을 함유하는 배기가스의 처리방법 및장치
IPC: B01D53/86
Filed: 1999-08-05
Abstract: 본 발명은 C 2 F 6 등의 플루오르 함유 화합물을 함유하는 배기가스(1)를, 예를 들어 80O℃∼900℃의 고온으로 가열되어 있는 γ-알루미나 등의 산화 알루미늄(3)과 접촉시켜서 플루오르 함유 화합물을 분해하는 방법 및 장치를 제공한다.  본 발명에 있어서는 플루오르 함유 화합물 중의 플루오르원자가 HF가 되는 데에 필요한 몰 수 이상의 H 2 가 존재하고 있어도 된다.  플루오르 함유 화합물의 분해율이 높고, 수명이 길며, C0의 발생이 적다.
Patent KR-20010072750-A (KR)
Title: 제지 동안 배수 속도 및 미세섬유 보유의 개선 방법
IPC: D21H17/07
Filed: 1999-08-18
Abstract: 실리카/벤토나이트계 입자가 없이 충전되지 않은 신문용지용 퍼니쉬에 효과적인 배수 속도 및 미세섬유 보유를 개선하는 방법이 개시되어 있다.  이 방법은 양이온성 또는 양성 전분, 및 양이온성 고분자전해질을 첨가한 후 고분자량의 음이온성 폴리아크릴아미드 공중합체를 첨가하는 것을 포함함을 특징으로 한다.
Patent KR-20010072865-A (KR)
Title: 차량 헤드램프 및 차량
IPC: F21S8/10
Filed: 2000-06-23
Abstract: 차량(1)의 헤드램프(2, 3)는 복수의 광전 소자들(11, 12, 13, 14), 바람직하게는 발광 다이오드들(LED)을 포함하는 광원(4, 5)을 갖는다.  이들 광전 소자들(11, 12, 13, 14) 중 적어도 하나의 광전 소자는 동작시에 5 lm 이상의 광속(luminous flux)을 갖는다.  본 발명에 따르면, 광원(4, 5)에 의해 발생된 광 빔(6, 6', ..., 7, 7', ...)의 스펙트럼 특성은 연속적으로 조정가능하다.  바람직하게는, 상기 광원(4, 5)이 광전 소자들(11, 12, 13, 14)만 포함한다.  바람직하게는, 공간 분포가 차량(1)의 속도, 차량(1)의 핸들의 회전 위치, 기상 상태에 의해 영향을 받는다.  또한 차량(1)의 운전자에 의해 영향을 받을 수도 있다.  바람직하게는, 광원(4, 5)에 의해 발생된 광 빔(6, 6', ..., 7, 7', ...)의 스펙트럼 특성은 상기 광 빔(6, 6', ..., 7, 7', ...) 내의 위치에 의존한다.  상기 광 빔은 본래 상이한 스펙트럼 특성을 갖는 적어도 두 개의 광 빔 세그먼트(6, 6', 7, 7',)를 포함한다.
Patent KR-20010085580-A (KR)
IPC: A61F13/49
Filed: 1999-08-23
Abstract: 본 발명은 증기 투과성 배면시트, 이 배면시트와 정면으로 마주보게 위치하는 액체 투과성 상부시트 및 배면시트와 상부시트 사이에 위치하는 흡수체를 포함하는 흡수품을 제공한다.  또, 흡수품은 흡수체와 배면시트 사이에 통기층을, 흡수체와 상부시트 사이에 서지 처리층을 포함할 수 있다.  흡수품은 사용 중 흡수품 내에 개선된 환기를 나타낸다. 따라서, 흡수품은 사용 중에 온도를 유지시키고, 착용자의 피부 수화 수준을 실질적으로 감소시킴으로써, 피부가 미생물의 생육을 덜 허용하게 한다.
Patent KR-20010079984-A (KR)
IPC: F16G5/16
Filed: 1999-11-04
Abstract: 금속벨트는 구동 풀리(12)와 피동 풀리(15)사이에 괘장되는 금속제 밴드(18)와, 그 밴드의 연장방향으로 적층하여 배치된 다수의 엘리먼트(l9)를 구비하고 있다. 각 엘리먼트는 선재에 의하여 구성되고, 풀리에 접촉하는 보디부(31)와, 상기 보디부의 양측에서 각각 일어서는 입설부(32)와, 상기 입설부로부터 연출하고, 또한, 대향하여 배치된 한 쌍의 갈고리상부(33)를 구비하고 있다. 밴드(18)는 각 엘리먼트의 개구부(34)에 삽통되고, 개구부내에는 밴드(18)와 중합시켜 탈락방지체(20)가 배치된다.
Patent KR-20010099927-A (KR)
Title: Proximity fuze
IPC: F42C13/04
Filed: 1999-12-22
Abstract: A proximity fuze for use in a tube launched projectile carrying a payload, comprising oscillator means for generating a radio frequency signal which has a varying frequency, a single antenna means for transmitting the radio frequency signal and for receiving an echo of the radio frequency signal, signal processing means for generating a range signal corresponding to the time delay between the transmission of the radio frequency signal and the receipt of the echo signal, means for comparing the range signal with a reference signal and depending on the result of the comparison generating an activation signal for activating the payload, wherein a directional coupling means is used for coupling the radio frequency signal from the oscillator means to the antenna means and to the signal processing means and for coupling the echo signal from the antenna means to the signal processing means.
Patent KR-20010108227-A (KR)
Title: Floating offshore construction, and floating element
IPC: E21B17/01
Filed: 2000-02-16
Abstract: A floating offshore construction (1) comprising a suspension gear (7) for suspending a riser construction (6). The suspension gear comprises a guide which extends adjacent the water surface during use, with a float (12) disposed therein for axial movement. The float comprises coupling means (13) for coupling to a riser construction. The invention also relates to a float.
Patent KR-20010104351-A (KR)
IPC: A61F2/00
Filed: 2000-02-22
Abstract: 하중-지지 골 임플란트(load-bearing osteoimplant)와, 골 임플란트의  제조방법 그리고 골 임플란트를 사용한 골 복구 방법이 제공된다. 골 임플란트는, 골 단편(bone particles)의 성형되고, 압축된 조성물(shaped, compressed composition)을 포함하여 구성된다. 골 임플란트는 약 0.7g/㎤ 보다 큰 체적 밀도(bulk density)와 적어도 약 3MPa의 습식 압축 강도(wet compressive strength)를 갖는다.
Patent KR-20020007318-A (KR)
Title: 회원자격구입기회를 가질 수 있는 마켓팅시스템 내에서의전자상거래
IPC: G06Q30/02
Filed: 2000-02-29
Abstract: 본 발명은 대화형 온라인방법을 통해 새로운 고객을 사인업하고 모집하고 새로운 독립사업주를 트레이닝 및 후원하기 위한 시설을 구비하는, 월드와이드웹을 통해 마켓팅회사의 제품의 완전한 전자상거래 및 해결책을 제공하는 시스템 및 방법에 관한 것이다.  다른 특징에 있어서, 본 발명은 전자상거래 및 직접대면거래를 사용하는 회원자격구입기회와 마켓팅사업의 조합에 관한 것이다.  본 발명은 또한 회원자격구입기회와 마켓팅사업을 조합함으로써 마켓팅플랜에 참가한 독립사업주가 고객을 회원자격구입기회에 소개할 수 있고 그 회원들의 구입에 기초하여 수당 또는 수수료를 얻을 수 있게 하는 한편 회원자격구입기회를 얻은 회원들은 옵션에 따라서 제품을 소비하거나 독립사업주가 될 수 있는 자격을 얻을 수 있는 시스템 및 방법에 관한 것이다.
Patent KR-20010105378-A (KR)
IPC: G02F1/13
Filed: 2000-03-07
Abstract: 다수의 신호선과 다수의 주사선을 매트릭스상으로 배치한 액정 패널(1)의 주변 가장자리부 표면의 도체 상에, 출력부와 입력부가 이방 도전성 접착제(9)를 통해서 열압착으로 직접 접속된 액정 구동용 LSI(5와 6)를 장착하는 동시에, 액정 패널(1)의 주변 가장자리부의 단자 도체(1)와 회로 기판(12와 16) 사이를 액정 구동용 LSI(5와 6) 각각의 수에 대응하는 필름 점퍼 기판(10과 14)으로 접속한다. 이것에 의해, 설계 자유도가 높고 설계 변경이 용이하며, 부품 재료의 공용화를 도모할 수 있고, 또한, 불량의 액정 구동용 LSI를 신속하고 정확하게 특정하여 리페어를 용이하게 할 수 있으며, 저비용으로 신뢰성이 높은 액정 표시 장치 및 그 검사 방법을 제공한다.
Patent KR-20030067985-A (KR)
Title: Communication system and control method therefof
Inventor: LEE SEUNG GEUN
IPC: H04M1/00
Filed: 2002-02-09
Abstract: PURPOSE: A communication system and a control method therefor are provided to simply couple a general phone with a mobile phone, and to receive/transmit voices and text data as performing an external dialing function while charging a battery, thereby enabling communication of the mobile phone. CONSTITUTION: A multifunctional phone has a keypad. A mobile phone(200) charges a battery, and receives/transmits a call. A communication system(100) enables a voice call by connecting to a wireless communication network after transmitting an originating signal to the mobile phone(200). The communication system(100) operates a multi vibrator(270) and a bell sound driver(245) through a latch circuit(230) from an output signal of a hook on/off switch(215) and a receiving signal sensor(225) for a receiving signal of the mobile phone(200). The communication system(100) transmits the output signal of the multi vibrator(270) to the mobile phone(200) and a handset(130) through a communication interface(300), and controls a data type and operational timing between the mobile phone(200) and the handset(130). The bell sound driver(245) outputs a set bell sound when the receiving signal is applied from the mobile phone(200) through a speaker(250).
Patent KR-20030068281-A (KR)
Title: Apparatus and method for manufacturing collimator
Inventor: HWANG MYEON SUN
IPC: G02B6/10
Filed: 2002-02-14
Abstract: PURPOSE: An apparatus and a method for fabricating automatically a collimator are provided to reduce a fabricating time and improve the productivity by fabricating automatically the collimator. CONSTITUTION: An apparatus for fabricating automatically a collimator includes a loading portion(30), an angle alignment portion(40), a spot alignment portion(50), and a dispensing portion(60). The loading portion loads a glass tube having a green lens and a pigtail having one or more fibers. The angle alignment portion aligns a gradient and an axial degree to the green lens by inserting the pigtail into the glass tube. The spot alignment portion controls an optical characteristic between the pigtail and the green lens. The dispensing portion fixes the angle-aligned and spot-aligned pigtail into the glass tube. The loading portion, the angle alignment portion, the spot alignment portion, and the dispensing portion are arranged around a turntable(20).
Patent KR-20020038614-A (KR)
Inventor: HAN SANG KWAN
IPC: A63B5/00
Filed: 2002-02-16
Abstract: PURPOSE: An exercise appliance set is provided to enable a user to effectively achieve the exercise effect of a jump rope as well as the exercise effect of an elastic plate even in a narrow space. CONSTITUTION: The exercise appliance set for enabling the exercise in a narrow space is comprised of a lower elastic plate member(6) constituting an elastic plate; an elastic member stand(7) installed on the lower elastic plate member; an elastic member(5) such as a spring to be coupled to the elastic member stand; an upper elastic plate(4); and a jump rope exercise device composed of a rope portion(2), a handle portion(3), and a movable ball(1) hinged to the distal end surface of the rope portion.
Patent KR-20030069535-A (KR)
Title: Composite material of high tenacity and non-retraction grouting material which including powder of wasted tire and powder of plastic
Inventor: JUNG HEE GAB
IPC: C04B18/20
Filed: 2002-02-21
Abstract: PURPOSE: A non-retraction grout material composition is provided, to obtain a grout material having high fluidity, no contraction, high strength, high tenacity and a high durability by employing a powdered waste tire and a powdered resin. CONSTITUTION: The non-retraction grout material composition contains 1-3 wt% of a powdered waste tire; and 0.5-2.0 wt% of a powdered resin. Preferably the non-retraction grout material composition comprises 35-40 wt% of common Portland cement; 3.5-5.2 wt% of a swelling agent; 5-10 wt% of fly ash; 40-55 wt% of sand; 1-3 wt% of a powdered waste tire; 0.5-2.0 wt% of a powdered resin; 0.3-0.8 wt% of a superplasticizer; and 0.05-0.2 wt% of an antifoaming agent. Preferably the swelling agent is calcium sulfur aluminate-based one; and the sand has a particle size of 2.5 mm or less.
Patent KR-20030071919-A (KR)
Title: Developer cartridge for liquid image developing system, and developer supplying and collecting system using it
Inventor: CHO JUN HUI
IPC: G03G21/10
Filed: 2002-03-02
Abstract: PURPOSE: A developer cartridge of a wet image developing system and an apparatus for supplying and recovering a developer with the same are provided to reduce an installation space and easily maintain and repair the developer cartridge the by forming a supplied developer containing part and a used developer containing unit in one cartridge. CONSTITUTION: A supplied developer containing part(210) includes a developer outlet(211) for supplying a developer to a developing unit, and a developer inlet(212) recovering the oversupplied developer from the developing unit. A used developer containing unit(220) is separated from the supplied developer containing part by a partition(201), having a used developer inlet(221) for recovering used developer.
Patent KR-20020067439-A (KR)
Inventor: CHUN SEONG CHEOL
IPC: B29D11/00
Filed: 2002-04-17
Abstract: PURPOSE: Provided is a mold structure with preventing idling of zig for manufacturing contact lens which prevents a male mold from being held on the zig and idled so that it makes ease of processing with reducing working time. CONSTITUTION: In the manufacturing machine for contact lens which is consisted of the zig(30) at the chuck of lathe; a male mold(20) to form the surface of contact lens and a female mold(10) to cast contact lens, the mold structure with preventing idling of zig for manufacturing contact lens is characterized by placing plural angle-typed fixed sills(21) at one internal side of the male mold to prevent the male mold from being shaken in combining the male mold with the zig.
Patent KR-20020088355-A (KR)
Inventor: SHIGA MASAKATSU
IPC: B30B1/26
Filed: 2002-05-10
Abstract: PURPOSE: To improve mechanical accuracy and the accuracy of worked products and also to reduce vibration and noise by eliminating backlash concering the power transmission of a press. CONSTITUTION: A suspension mechanism is formed into liquid tight structure by covering the lower end part of a female screw member and covering a reainer by using a liquid tight forming member provided between a slide and the retainer. High-pressure liquid is initially supplied into individual clearances formed between arbitrary component members of the liquid tight forming member, the female screw member, a male screw member and the retainer through a liquid supply path which penetrates the liquid tight forming member. Furthermore, the liquid pressure in the liquid-tight structure is maintained at a value within a specified range by replenishing the high-pressure liquid of only the amount which has leaked to the outside through the female screw member and the screwed part between the female screw member and the male screw member.
Patent KR-20030090919-A (KR)
Title: Composition of non-aqueous electrolytes useful for batteries and capacitors
Inventor: NOH HWAN JIN
IPC: H01M10/058
Filed: 2002-05-23
Abstract: PURPOSE: A nonaqueous electrolyte composition for a battery or condenser is provided, to prevent the leakage of an electrolyte solution, to stabilize the interface between an electrode and a separator for improving the lifetime and to improve the electrical properties at a high temperature. CONSTITUTION: The nonaqueous electrolyte composition is obtained by adding a mixture of the crosslinkable monomers having an acrylate functional group represented by (CH2=C(R1)COO(CH2)nCOO)3C(CH2)nX and CH2=C(R1)COO(CH2)nX and a polymerization initiator to a nonaqueous electrolyte composition for a battery or condenser; and heating the mixture to crosslink the compounds, wherein R1 is H or a methyl group; n is 1-10; and X is a methyl group, a hydroxyl group or an amine group. Preferably the ratio of (CH2=C(R1)COO(CH2)nCOO)3C(CH2)nX and CH2=C(R1)COO(CH2)nX is 1.5-5.1 : 1 by equivalence and the content of the mixture is 1-10 wt%.
Patent KR-20030019081-A (KR)
Title: Semiconductor integrated circuit allowing proper detection of pin contact failure
Inventor: MIHARA MASAAKI
IPC: G01R31/28
Filed: 2002-05-27
Abstract: PURPOSE: To provide a semiconductor integrated circuit for appropriately detecting a pin contact failure in a pin contact test in the semiconductor integrated circuit of a multi-chip package. CONSTITUTION: In a pin contact test, voltages that are to be supplied to the power supply nodes of input protection circuits 100 and 200 of chips CA and CB, respectively, are set to specific voltages by voltage control circuits 300 and 310. Then, a specific constant current If is supplied to an external pin PIN0, thus measuring voltages applied to the external pin PIN0. According to the result, the pin contact failure in the chips CA and CB can be detected.