baber/WOPTO huggingface dataset:
Patent KR-20090038000-A (KR)
Inventor: KIM DAI SIK
IPC: B23P19/06
Filed: 2009-03-26
Abstract: 본 발명은 너트 자동체결장치에 관한 것으로서, 너트를 체결하여 조립하도록 클램프가 안착된 클램프 안착부가 클램프이송부에 의해 턴테이블로 이송되어 턴테이블이 90°로 회전되어 너트자동체결부의 하부측 정위치에 순차적으로 위치되면, 구동모터에 의해 회전되는 너트자동체결부의 너트체결대에 의해 클램프에 자동으로 너트가 체결될 수 있어 클램프 조립에 따른 조립성 및 생산성이 크게 향상될 수 있을 뿐만 아니라, 너트자동체결부가 승하강부에 의해 정위치에 위치된 클램프측으로 자동 하강되어 너트가 자동으로 체결될 수 있음에 따라 작업자가 일일이 수작업에 의해 너트체결부에 너트가 체결되는 물품을 이동하지 않아도 너트자동체결부의 하부에 정확하게 자동으로 너트가 체결되는 물품이 정위치됨에 따라 너트의 체결작업이 정교하고 용이하게 이루어짐에 따라 작업효율성이 크게 증대될 수 있는 너트 자동체결장치를 제공하고자 한다. 
     이를 위해 본 발명은, 2개의 지지플레이트(111)(112)와, 상기 2개의 지지플레이트(111)(112)가 끼워진 좌우측 가이드지지봉(113)과 상기 2개의 지지플레이트 중 상부측 지지플레이트(111)에 일단이 결합되는 실린더(114)로 구성된 승하강부(110)와; 상기 승하강부(110)의 2개의 지지플레이트 중 상부측 지지플레이트(111)의 상단에 결합되는 구동풀리(121)이 축설된 구동모터(122)와, 상기 구동풀리(121)과 벨트(123)에 의해 연결되는 연동풀리(124)과, 상기 구동풀리(121)과 연동풀리(124)의 하부측에 연결되는 회전대(125)와, 상기 회전대(125)의 하부측에 상단이  연결되는 연결대(126)와, 상기 연결대(126)의 하단이 상단에 연결되고 하단측에 너트가 인입되는 너트체결대(127)로 구성된 너트자동체결부(120)가 포함되어 이루어지는 것을 특징으로 한다. 
     상기 승하강부(110)의 2개의 지지플레이트(111)(112) 사이에는 이 2개의 지지플레이트(111)(112)의 상부와 하부를 연결하여 지지하는 지지봉(131)과; 상기 지지봉(131)의 외측에 끼움결합되는 스프링(130)이 더 포함되어 이루어진다. 
     
     클램프, 너트체결, 너트자동체결장치
Patent KR-20100107897-A (KR)
Title: Method for manufacturing high purity metal compounds using the hydrometallurgical process from the tantalum ore
Inventor: WOO SANG MO
IPC: C22B34/24
Filed: 2009-03-27
Abstract: PURPOSE: A method for manufacturing high-purity metal compounds from tantalum ores using a hydrometallurgical process is provided to ensure an environmentally-friendly process by reducing the amount of hydrofluoric acid used for leaching. CONSTITUTION: A method for manufacturing high-purity metal compounds from tantalum ores using a hydrometallurgical process is as follows. Tantalum ores are crushed and selected. The selected powder is leached and the leachate and residue are separated. Tantalum and niobium of the leachate are extracted with a first extraction solvent. Tantalum and niobium are precipitated and dissolved again using acid. A second extraction solvent containing tantalum and the residual solution containing niobium are separated using kerosene.
Patent KR-20100107963-A (KR)
Title: Electrochemical hydrogen peroxide biosensor based on ag nanowires modified electrode and the preparation method for the same
Inventor: SONG MIN JUNG
IPC: G01N27/30
Filed: 2009-03-27
Abstract: PURPOSE: An electrochemical hydrogen peroxide biosensor based on Ag nanowires modified electrode and a manufacturing method for the same are provided to detect peroxide of hydrogen of a lower concentration. CONSTITUTION: A manufacturing method of an electrochemical hydrogen peroxide biosensor based on Ag nanowires modified electrode is as follows. A nanosilver-layer is formed on a gold electrode. The gold electrode with nanosilver-layer is dipped in cysteamine solution in order to form a cysteamine layer on the nanosilver-layer. The surface of electrode with a cysteamine layer is exposed to glutaldehyde solution in order to combine cysteamine and glutaldehyde. The glutaldehyde treated electrode is dipped in solution containing enzyme in order to combine enzyme and electrode.
Patent KR-20090061611-A (KR)
Inventor: KIM CHANG YOUNG
IPC: E03C1/28
Filed: 2009-04-10
Abstract: A stink interception member for sewer is provided to be placed in a drain without a separation installation structure and ascend/descend according to the water level collected in a drain duct to open/close the drain. A stink interception member for sewer is installed in a drain(110) of a drain duct(100) connected to the sewer to open the drain in drainage and close the drain at other times in order to prevent backflow of odor from the sewer. An air housing space is formed inside the member and a housing member surrounds the air housing space airtightly. The member opens or closes the drain by ascending or descending according to water level variation in the drain duct.
Patent KR-20100117326-A (KR)
Title: Heat decomposition transfer apparatus of track vehicle rubber shoe
Inventor: KIM CHANG KEE
IPC: C10G1/10
Filed: 2009-04-24
Abstract: PURPOSE: A pyrolysis transfer device of a rubber shoe for a track vehicle is provided to obtain the reclaimed oil to collect and to recycle an oily material, such as BTX, carbon black, etc. CONSTITUTION: A pyrolysis transfer device of a rubber shoe for a track vehicle comprises a guide pipe(20) and a driving unit. The guide tube is installed to pass through a heating room. The driving unit is connected to both sides of the guide pip. A chain conveyor(10) wound on the driving unit is circulated in the guide pipe. An inet and an outlet are connected to both ends of the guide pipe. The chain conveyor is inserted into transfer rails(12a, 12a') and return rails(12b,12b'), to which ring chains are connected to be respectively corresponded to both inner-walls of the guide pipe in a longitudinal direction.
Patent KR-20100117959-A (KR)
Title: Combustion testing apparatus of pulverized coal
Inventor: KIM KWANG HWA
IPC: C21B9/10
Filed: 2009-04-27
Abstract: PURPOSE: A combustion testing apparatus for pulverized coal is provided to minimize the incomplete combustion of pulverized coal in a blast furnace and thus improve the productivity of hot metal. CONSTITUTION: A combustion testing apparatus for pulverized coal comprises a heater(10) which heats the air provided from an air supply part and discharges the heated air to a discharge tube, a pulverized coal injection part(20) which is connected to the discharge tube of the heater to inject the pulverized coal into the discharge tube, a pulverized coal combustor(30) which is connected to the discharge tube of the heater and burns the heated air and the pulverized coal injected together, and an exhaust part(40) which is connected to the pulverized coal combustor and collects the combustion gas in the pulverized coal combustor in order to measure the combustibility of the pulverized coal.
Patent KR-20100118708-A (KR)
Title: Method for generating transverse elastic wave, method for acquiring image using transverse elastic wave and apparatus therefor
Inventor: KIM TAE YONG
IPC: G01N29/06
Filed: 2009-04-29
Abstract: PURPOSE: A method for generating transverse elastic wave, which accurately diagnoses and checks the inside of a viscoelastic medium, and a device and method taking images using transverse elastic wave are provided to increase definition of an elastic deformation image by conveniently increasing the viscoelastic medium to the optimal level. CONSTITUTION: A method for generating transverse elastic wave is as follows. An ultrasonic signal is focused on the focal point of M on viscoelastic medium. The ultrasonic signal from different ultrasonic signal emitting source is focused on the focal point of M. The ultrasonic signal emitting member(111) has multiple ultrasonic signal emitting sources. The concentration point of time of ultrasonic signal each focused the focus of M is similar. The focus of M is located at a regular interval.
Patent KR-20100119688-A (KR)
Title: An assembly for slab-panel
Inventor: KIM SI YOUNG
IPC: E04G11/38
Filed: 2009-05-01
Abstract: PURPOSE: A slab panel assembly is provided to facilitate the installation and dismantlement of a slab panel and to minimize the size of a non-standard panel. CONSTITUTION: A slab panel assembly comprises multiple slab panels(100), a plywood support(150), and filler plywood(110). When both sides of the filter plywood are supported on one side of the slab panel, the plywood support is installed to have fixed depth for the formation of the same plane with the slab panel. The plywood support comprises a square timber receiving space. Both sides of the filler plywood are supported by the plywood support.
Patent KR-20100125608-A (KR)
Title: 차량의 경고음 재생 장치 및 방법
Inventor: LEE JUN WOO
IPC: B60Q5/00
Filed: 2009-05-21
Abstract: 본 발명은 차량의 경고음 재생에 관한 것으로 보다 상세하게는 차량에서 발생되는 경고음을 외장 앰프에서 일원화 처리하므로 경고음을 고품질의 사운드로 제공할 수 있으며 소형 스피커의 수를 줄일 수 있는 차량의 경고음 재생 장치 및 방법에 관한 것이다. 또한 본 발명은 차량의 모듈로부터 경고음 정보를 수신하면 멀티미디어 캔 신호로 변환 제공하는 게이트웨이 및 게이트웨이로부터 경고음 정보를 멀티미디어 캔 신호로 수신하면 차량의 경고음의 종류를 파악하고 차량의 스피커로 출력시키는 외장 앰프를 포함한다. 
       
     경고음, 스피커, 게이트웨이.
Patent KR-20100126092-A (KR)
Title: Circuit for discriminating operations of a reciprocal expulsion and discriminating method thereby
Inventor: CHUNG YUN MO
IPC: G06F13/36
Filed: 2009-05-22
Abstract: PURPOSE: A circuit for discriminating operations of a reciprocal expulsion and a discriminating method using the same are provided to easily recognize the operation state of a system by confirming the logical state of a bus line. CONSTITUTION: A bus state line is connected to a VCC input terminal. Systems comprises a bus state line checker which checks the logical state of the bus state line, and a logical output unit which changes the logical state of the bus state line. A pull-up resistor is prepared between the VCC input terminal and the systems. The logical states of the bus state line are different to each other according to the use or non-use of the bus state line of the systems.
Patent KR-20100128505-A (KR)
Title: Radiator for vehicle
Inventor: KANG MYOUNG KWAN
IPC: F28F9/02
Filed: 2009-05-28
Abstract: PURPOSE: A radiator for a vehicle is provided to facilitate joint between a header and a header tank through a locking structure made of combining projections of a header tank and combining recesses of a header. CONSTITUTION: A radiator for a vehicle comprises a pair of headers(11), a pair of tanks, and multiple tubes. A pair of tanks is coupled with each header. The multiple tubes are installed between a pair of header tanks. The header has a flat central part. A joint part(11c) is formed at the edge of the central part. The joint part has multiple bonding grooves(11a). Multiple combining projections(15e) are formed at the edge bottom of the header tank and inserted into combining grooves, individually.
Patent KR-20100129076-A (KR)
Inventor: LEE JAE HO
IPC: G11C5/14
Filed: 2009-05-29
Abstract: 본 발명은 반도체 소자의 파워 온 리셋 회로에 관한 것으로, 서로 다른 전위를 갖는 다수의 분배 전압을 출력하는 전압 생성부와, 상기 다수의 분배 전압을 각각 기준 전압과 비교하여 검출 신호를 출력하는 검출부, 및 상기 검출 신호에 응답하여 파워 온 리셋 신호를 출력하는 신호 생성부를 포함하는 반도체 소자의 파워 온 리셋 회로를 개시한다. 
       
     파워 온, 기준 전압, 외부 전원
Patent KR-20100133594-A (KR)
Title: Fresnel lens structure for a flash module of potable device
Inventor: CHOI MU GILE
IPC: G02B3/08
Filed: 2009-06-12
Abstract: PURPOSE: A Fresnel lens for a portable device is provided to improve an exterior by arranging a flash module circuit inside. CONSTITUTION: A Fresnel pattern part(220) is formed in the central lower side of a lens body(210) inward. A leg part(230) is projected from the lower side of the body part. A Fresnell pattern in the Fresnel lens part corresponds to the view angle of a camera module. Light is collected from an LED element.
Patent KR-20100136584-A (KR)
Title: Automatic cutting and packing system for textile
Inventor: CHANG IK SOON
IPC: B65H45/107
Filed: 2009-06-19
Abstract: PURPOSE: An automatic textile cutting and packing system is provided to automate the stacking, cutting, measuring, folding and packaging of textile and to automatically transfer textile to each work unit. CONSTITUTION: An automatic textile cutting and packing system comprise a textile supply unit(10), a loading unit(20), a measuring unit(40), a cutting unit(30), a folding unit(50), a packing unit(60), and a transfer conveyor(80). The textile supply unit laminates textile(1) in the loading unit. The loading unit loads the textile provided from the textile supply unit to the fixed width and length. The measuring unit measures the weight of the textile transferred from the loading unit. The cutting unit is arranged between the loading unit and the measuring unit and cuts the textile between the loading unit and the measuring unit. The folding unit folds the textile to be overlapped with each other. The packing unit packs the folded textile in a packing material. The transfer conveyor transfers the textile cut by the cutting unit to the measuring unit, the folding unit, and the packing unit.
Patent KR-20100138375-A (KR)
Inventor: CHO JUN SIK
IPC: F25D23/02
Filed: 2009-06-25
Abstract: 본 발명의 냉장고용 홈바는, 냉장고 도어의 개구부에 설치되는 홈바 도어; 상기 개구부에 설치되는 고정부; 상기 홈바 도어와 고정부 사이를 연결하는 회전링크; 및 상기 고정부와 회전링크의 사이에 설치되어 상기 홈바 도어를 탄성력에 의해 개폐하는 힌지를 포함하되, 상기 홈바 도어의 개방시 홈바 도어는 냉장고 도어의 전면에 나란하게 유지되는 것을 특징으로 한다. 
     이에 따라, 냉장고 도어의 전면에 대해 나란하게 개폐되는 홈바 도어에 의해 음료 등을 수납할 때 사용자와의 간섭을 방지하는 효과가 있다. 
       
     냉장고용 홈바, 홈바 도어, 회전링크, 힌지
Patent KR-20110000258-A (KR)
Title: A speaker assembly for display device
Inventor: YEO SIM DONG
IPC: H04N5/655
Filed: 2009-06-26
Abstract: PURPOSE: A speaker assembly of an image display device is provided to support a speaker unit by a plurality of magnets, thereby not generating an external noise by a vibration of a speaker unit. CONSTITUTION: A speaker assembly of an image display device includes a housing, a display panel, a boss(170) and a speaker unit(100). A display panel is installed in the housing. The display panel outputs an image. The boss is installed in the housing. In the boss, two or more stationary magnets(176,178) is separated to each other. In a speaker unit, a floating magnet(162) is installed in a side surface between two stationary magnets. The speaker unit converts an electric signal into sound.
Patent KR-20100054706-A (KR)
Title: Rotor mechanism
Inventor: HOSOKAWA KAZUHIRO
IPC: B65H3/42
Filed: 2009-07-02
Abstract: PURPOSE: A rotor mechanism is provided to steadily operate with simple configuration. CONSTITUTION: A rotor mechanism comprises: a first rotor(1) which is fixed to a rotary shaft(4) and revolves with the rotary shaft in one body; a second rotor(2) which is rotatably fixed in the rotary shaft; a push member(3) which is fixed in the circumference of the rotary shaft; a pin(25) which is fixed to the rotary shaft and rotates the second rotor; and a spring(26) which occurs biasing force to the second rotor.
Patent KR-20100132893-A (KR)
Title: A cleaning device and a dust collecting method thereof
Inventor: HAN JUNG GYUN
IPC: A47L9/28
Filed: 2009-07-08
Abstract: PURPOSE: A cleaning device and a dust collecting method using the same are provided to prevent a failure of a dust collection unit even if the dust collection unit is washed with water because no electronic parts are installed in the dust collection unit. CONSTITUTION: A cleaning device comprises a main body(10), a brush unit(60), a blower unit(70), and a dust collection unit(80). The brush unit is installed in the center of the main body and allowed to rotate. The blower unit is installed in the front area of the main body and provides a suction force. The dust collection unit is detachably installed in the rear area of the main body, separately from the blower unit, and stores dust.
Patent KR-20100014120-A (KR)
Title: Method for manufacturing ammonia gas absorbent using fe-zeolite
Inventor: BAE IN KOOK
IPC: B01D53/02
Filed: 2009-07-09
Abstract: PURPOSE: A manufacturing method of an ammonia gas adsorbent using Fe-zeolite is provided to remove and adsorb environment-friendly ammonia gas with the Fe-zeolite produced from melting slag, and to stably process waste. CONSTITUTION: A manufacturing method of an ammonia gas adsorbent comprises the following steps: producing a compound by mixing pulverized Fe-zeolite and a shaping supplemental agent; molding the compound with a binder; and sintering(S30) and drying(S23) the Fe-zeolite of a granule shape. The temperature of a sintering step is 450-550°C. The pulverized Fe-zeolite is manufactured by reforming zeolite Na-A with a Fe compound.
Patent KR-20110005607-A (KR)
Title: Process for the preparation of aluminus refractory body
Inventor: KIM JAE SOO
IPC: C04B14/30
Filed: 2009-07-10
Abstract: PURPOSE: A method for preparing alumina refractories using aluminum dross is provided to effectively remove metal aluminum, aluminum nitride and carbon contained in the aluminum dross. CONSTITUTION: A method for preparing alumina refractories using aluminum dross comprises: a step of removing impurities contained in aluminum dross; a step of mixing 80-95 weight% of pretreated aluminum dross and 5-20 weight% of kaolin(clay, terra alba) and plasticizing at 1,500-1,900°C; and a step of cooling and pulverizing the mixture. Acetylene gas generated during pretreatment of aluminum dross is used as a heat source.
Patent KR-20110007799-A (KR)
Title: Shopping vod data proffering system for iptv and method of the same
Inventor: MAENG SOO HO
IPC: G06Q30/06
Filed: 2009-07-17
Abstract: PURPOSE: A shopping VOD data providing system using an IPTV and a method thereof are provided to selectively reproduce VODs for various product shopping in a corresponding shopping VOD channel. CONSTITUTION: A broadcasting data transmitting server(8) transmits various broadcasting data to STB(Set-Top Box)s(4a~4n). The STB reproduces broadcasting data of the broadcasting data transmitting server. The STB receives a selection signal of a channel number. The STB executes auto session setting by a URL of a specific remote server linked to the channel number. The STB selectively reproduces a plurality of VOD(Video On Demand)s of the remote server according to the selection signal. A shopping VOD providing server(10) provides a plurality of shopping VODs to a corresponding STB.
Patent KR-20110010903-A (KR)
Title: Copper pipe connecter automatic formation system and formation method
Inventor: SUL SANG SUK
IPC: B21D22/14
Filed: 2009-07-27
Abstract: PURPOSE: An automatic molding device of a copper pipe connector and a molding method are provided to automatically perform a material cutting process, a grinding process, a washing process, and a molding process as one unit process. CONSTITUTION: An automatic molding device of a copper pipe connector comprises a principal axis(100), a casting processing part(200), a cutting fluid chamber(24), a cutting fluid nozzle(25), and a discharger(26). The principal axis can rotate, clamps and unclamps a copper pipe raw material. A hollow shaft is formed inside the principal axis. A collet chuck(12) is formed at the end of the principal axis.
Patent KR-20110011068-A (KR)
Title: Battery module of improved cooling efficiency
Inventor: LEE BUMH YUN
IPC: H01M50/211
Filed: 2009-07-27
Abstract: PURPOSE: A battery module is provided to minimize the damage of a battery cell in the leakage by forming a refrigerant pipe at the lower part of a cooling pin in one body and to maximize cooling efficiency while suppressing the increase of the whole size of the battery module. CONSTITUTION: A battery module comprises a plurality of plate-like battery cells(110) which are built in module case(120) and are arranged in an inside direction to face each other, an insulating member(130) corresponding to the circumferential surface of the battery cell installed between battery cells, and a cooling member(140) installed on the interface of the battery cell.
Patent KR-20110013979-A (KR)
Title: Air conditioner and control method thereof
Inventor: BAE BYUNG KWAN
IPC: F24F11/02
Filed: 2009-08-04
Abstract: PURPOSE: An air conditioner and a control method thereof are provided to reduce a warm-up time since the warm-up time varies by the comparing of a discharge temperature with an outdoor temperature. CONSTITUTION: An air conditioner comprises an indoor unit, an outdoor unit, an outdoor temperature sensor(110), a discharge temperature sensor(120) and a controller(100). The outdoor temperature sensor senses the outdoor temperature. The discharge temperature sensor senses the discharge temperature before the compressor is driven. The controller produces the difference value between the outdoor temperature and the sensed discharge temperature, compares the difference value with a set value and variably controls a warm-up time based on the comparison result. If the difference value is larger than the set value, the controller reduces the warm-up time. The controller variably controls one or more of a first warm-up time, for which the air conditioner is operated at a first compressor frequency, and a second warm-up time, for which the air conditioner is operated at a second compressor frequency.
Patent KR-20110014059-A (KR)
Inventor: YOO CHUNG SICK
IPC: G06Q40/08
Filed: 2009-08-04
Abstract: 변액보험설계용 스프래드쉬트가 개시된다. 본 발명은, 가입자에게 변액보험의 재무상황을 고지하기 위한 변액보험설계용 스프래드쉬트에 있어서, 가입자의 재무목표에 관한 정보인 재무목표정보를 기입하기 위한 재무목표영역(10); 가입자의 월납입금, 월대체금, 희망은퇴나이, 최종나이, 희망은퇴자금을 포함하는 변액설정정보에 기초하여 계산된 변액보험의 적립결과를 나타내는 정보인 변액결과정보를 출력하는 재무상황영역(20); 상기 재무목표정보 및 운용수익률에 기초하여 상기 가입자의 적립내역을 적립기간에 따른 그래프로 출력하고, 동일한 재무목표정보 및 운용수익률에 대해 펀드 및 예금에 대한 그래프도 동시에 출력하는 적립그래프영역(30); 및 월납입금, 월대체금, 수시인출금, 희망은퇴자금 및 현재변액적립금을 최초적립시부터 사망시까지 매월단위로 계산 및 표시하는 적립상황영역(40)을 포함한다. 본 발명에 의하면, 이해하기 어려운 변액보험의 재무상황을 직관적으로 파악할 수 있어 가입자가 변액보험의 장점을 파악하기 용이하고, 효율적인 재무설계가 가능하다.
Patent KR-20110015998-A (KR)
Title: Solar cell and method for manufacturing the same
Inventor: LEE CZANG HO
IPC: H01L31/042
Filed: 2009-08-10
Abstract: PURPOSE: A solar cell and a method for manufacturing the same are provided to prevent the deterioration of the solar cell by being manufactured based on thin film type polycrystalline silicon. CONSTITUTION: A buffer layer(120) is formed on an insulating substrate(110). A metal layer(130) is formed on the buffer layer. A first transparent conductive layer(140) is formed on the metal layer. First polycrystalline semiconductor layers(151, 152, 153) including a first type dopant is formed on a first transparent conductive layer. A second transparent conductive layer(160) is formed on the first polycrystalline semiconductor layers.
Patent KR-20110018776-A (KR)
Title: Display apparatus
Inventor: DO HEE WOOK
IPC: G02F1/13363
Filed: 2009-08-18
Abstract: PURPOSE: A display device which improved a viewing angle is provided to use light transmittance rate of a liquid crystal. CONSTITUTION: A display device which improved a viewing angle includes the second substrate(120), a liquid crystal layer(130), C-plate, the first optical unit(200), the second optical unit(300), and a biaxial compensation film. The second substrate faces the first substrate(110). The liquid crystal layer is interposed between two substrates and is operated as a vertical alignment mode. The first optical unit and the second optical respectively include the first polarization plate(210) and the second polarization plate. The first polarization plate has the first absorption axis. The second polarization plate has the second absorption axis. The first absorption axis and the second absorption axis are in mutual orthogonal state.
Patent KR-20100073964-A (KR)
Title: Soi radio frequency switch for reducing high frequency harmonics
Inventor: NOWAK EDWARD J
IPC: H01L21/20
Filed: 2009-08-21
Abstract: PURPOSE: An SOI(Semiconductor-On-Insulator) radio frequency switch for reducing harmonics of a high frequency is provided to improve the performance of an RF switch by reducing the harmonics through a signal combination. CONSTITUTION: A first doping type semiconductor region and a second doping type semiconductor region are formed under a buried insulation layer(20) of an SOI substrate. The first doping type semiconductor region has the same doping as the lowermost semiconductor layer(10). The second doping type semiconductor region has the doping opposite to the lowermost semiconductor layer. The first doping type semiconductor region and the second doping type semiconductor region are electrically grounded or forward-biased to the lowermost semiconductor layer within the potential difference which does not exceed 0.6V to 0.8V. The charge formed in the induced charge layer by an electric signal is discharged through an electric contact connected to the first and second doping type semiconductor regions.