baber/WOPTO huggingface dataset:
Patent KR-20090032317-A (KR)
Title: Method and server for authenticating terminal for determinating location
Inventor: HAN GYU YOUNG
IPC: H04W12/06
Filed: 2007-09-27
Abstract: A method and a server for authenticating a terminal for determining a location are provided to perform an additional terminal authentication process function, thereby improving security of a service of determining a location. A location determination server(130) comprises a location determination service message transmitting and receiving management unit, a location determination information message transmitting and receiving management unit, a terminal information table management unit, a terminal information table search management unit and a terminal authentication management unit. The terminal information table search management unit searches whether terminal identification information included in a location determination service request message and a location determination information message exists. The terminal authentication management unit determines whether to authenticate the terminal according to search result of the terminal information table management unit.
Patent KR-20070114082-A (KR)
Title: Method of providing layer structure for organizing screen and method of providing screen and the mobile communication terminal therefor
Inventor: BAEK SUNG HWAN
IPC: H04B1/40
Filed: 2007-10-02
Abstract: A method for providing a layer structure for organizing a screen, a method for providing the screen and a mobile communication terminal thereof are provided to organize a background screen with various visual effects and images according to status information, thereby enabling a sensuous approach in the representation of information. A method for providing a layer structure for organizing a character input screen in a mobile communication terminal comprises the following steps of: providing a time layer(200) for displaying a background image which is changed according to a time zone and a visual theme; providing a receive sensitivity layer(210) for outputting animation data which displays visual effects which are changed according to the receive strength of a radio signal and correspond to the visual theme of the background image; and providing a character input layer(220) for displaying characters inputted in correspondence to a request for the character output of the mobile communication terminal on the background image.
Patent KR-20090035072-A (KR)
Inventor: JEON HYEONG WON
IPC: B26D3/16
Filed: 2007-10-05
Abstract: 본 발명은 보빈에 감긴 화장지를 기계적 상호작동에 의하여 연속적으로 절단하는 두루마리 화장지의 자동 절단장치에 관한 것이다.
Patent KR-20090036410-A (KR)
Title: Circuit for generating reference voltage of semiconductor memory apparatus
Inventor: KANG DONG KEUM
IPC: G11C5/14
Filed: 2007-10-09
Abstract: A reference voltage generating circuit of a semiconductor memory device is provided to prevent the degradation of the driving strength due to the changing of characteristic of the driving strength in the power-up. If the power-up signal(Pwr) is activated, a driving strength control signal generating part(100) outputs the driving strength control signal(DRV_CTRL) in response to the temperature. A driving part(200) controls the current supply capability to the voltage transfer node(VT_Node) in response to the driving strength control signal. A reference voltage generating part(20) generates the reference voltage(Vref) by receiving the current from the voltage transfer node. The driving strength control signal generating part comprises a temperature sensing part, a voltage divider, and a comparison unit. The temperature sensing part produces the sensing voltage varied by the change of temperature. The voltage divider outputs the distribution voltage by equally dividing the exterior voltage.
Patent KR-20090038227-A (KR)
Title: Real time image and data monitor satellite system based on b-cdma wireless communications
Inventor: LEE YOON SUK
IPC: H04W24/00
Filed: 2007-10-15
Abstract: A system for monitoring real-time video/sensor data based on B-CDMA in order to inquire a fabrication history about agricultural and stockbreeding products is provided to offer ubiquitous based environment by integrating a monitoring system into environment data through B-CDMA. A collecting device(100) is installed at a production site. A base station device(200) receives environment data and monitoring data from the gathering apparatus of the corresponding environment or the production site. A data integration server(400) analyzes monitored data and received environment data. The data integrated server provides related data for the producer or consumer and boiler. A consumer terminal software(500) provides the monitoring image of the fabrication history of all kinds of the products or the production site to consumer. A producer terminal software(700) provides the monitoring image of the fabrication history of all kinds of the products or the production site or the information having relation to production for the producer.
Patent KR-20090039048-A (KR)
Title: System for context management in ubiquitous computing environments and method thereof
Inventor: HYUN SOON JOO
IPC: G06F19/28
Filed: 2007-10-17
Abstract: A system for managing context information in the ubiquitous computing environment and a method thereof are provided to avoid a task for processing an unnecessary context event by dispersing the context inference task, concentrated on a global context information management module, to local context information management modules. A plurality of local context information managers(100a-100n) manage the context information about each local domain. The local context information managers recognize and process the context information related to the domain specializing rule of each local domain. A global context information manager(200) manages the context information about a mutual domain, and receives the context information from a corresponding local context information manager to select one of overlapped local context information managers according to the object and kind of the corresponding context information. The global context information manager subscribes the change event of the provided context information.
Patent KR-20080035985-A (KR)
Title: Resist composition and patterning process
Inventor: TAKEDA TAKANOBU
IPC: G03F7/039
Filed: 2007-10-19
Abstract: A resist composition is provided to ensure high resolution, to be largely improved in pattern collapse by pattern profile defects in a line pattern after development, and to exhibit excellent etching resistance born of the pattern profile. A chemically amplified positive type resist composition includes (A) an amine oxide structure as a basic component, (B) an organic solvent, (C) a base material resin which is an alkali-insoluble or poorly soluble resin having an acidic functional group protected with an acid labile group, and is alkali-soluble when the acid labile group is removed, and (D) an acid generator. A patterning method includes the steps of: coating a substrate or mask blank with the resist composition; performing exposure with high energy radiation, EUV light, or electronic ray through a photomask after heating; and optionally after heating, performing development using a developer.
Patent KR-20090030188-A (KR)
Title: Ultra slim type acoustic transducer
Inventor: JEONG SEUNG KIU
IPC: H04R9/02
Filed: 2007-10-23
Abstract: An ultra slim type acoustic transducer is provided to amplify reproduced sound and the output level of sound by maximizing the volume of a first and a second magnet. In an ultra slim type acoustic transducer, a first magnet(110) is vertically magnetized and a second magnet(120) is horizontally magnetized. An air gap is formed between the first and the second magnets. A central yoke(130) is combined with the bottom of the first magnet while an outer yoke(140) is combined with the side of the second magnet and with the central yoke. At least a part of a coil unit(150) is inserted into the air gap between the first and the second magnet and the coil unit is mounted on a vibration plate(160).
Patent KR-20090042512-A (KR)
Title: Navigation system and method of providing voip service using the same
Inventor: AN SANG CHEOL
IPC: H04W4/04
Filed: 2007-10-26
Abstract: A navigation system and a VoIP service offering method using the same provide the auto guide service through the navigation by receiving the location information relating to the searched information through the remote manner. A navigation(100) provides the customized information retrieval service through consultant and voice communications to user besides the route guidance service. A wireless access point(200) is connected to the navigation through wireless network, and transmits the information requested from the user, and delivers the response to the navigation. A relaying server(300) is connected by the wireless access point and wire and wireless network A database(400) is connected by the relaying server and the internet network, and extracts and provides the request-information according to the call distribution of the relaying server.
Patent KR-20080053180-A (KR)
Title: Supporting substrates for semiconductor light emitting device and high-performance vertical structured semiconductor light emitting devices using the supporting substrates
Inventor: SEONG TAE YEON
IPC: H01L33/02
Filed: 2007-10-29
Abstract: A supporting substrate for a semiconductor light emitting device and the semiconductor light emitting device of vertical structure using the same are provided to improve the whole performance by reducing damage of a multi-layered structure of semiconductor single crystal that is lifted off from an initial growth substrate, by using a prepared supporting substrate. A selected supporting substrate(400) is made of a certain material, and is used as a substrate of a semiconductor light emitting device. A sacrificial layer(410) is formed on the upper portion of the selected supporting substrate, and a heat sink layer having excellent thermal and electrical conductivity is formed on the upper portion of the sacrificial layer. A bonding layer(430) is deposited on the upper portion of the heat sink layer. The selected supporting substrate is made of electrical conductor.
Patent KR-20090048740-A (KR)
Inventor: MOON EUN PYO
IPC: C12N15/09
Filed: 2007-11-12
Abstract: 본 발명은 서열번호 1의 아미노산 서열로 이루어지는 식물병원성 미생물에 대한 항미생물 펩티드 KCM11 및 상기 항미생물 펩티드 KCM11의 살균 또는 미생물 증식 억제 유효량을 식물에 투여하는 것을 포함하는 식물 병원성 미생물의 살균 방법 또는 미생물 증식 억제 방법에 관한 것이다. 
       
     식물병원성, 항미생물 펩티드, 미생물 증식 억제
Patent KR-20090049195-A (KR)
Inventor: JANG HWA YONG
IPC: G01M99/00
Filed: 2007-11-13
Abstract: 본 발명은 람다 센서가 비정상적인 출력을 내면, 비정상적인 출력을 내는 원인이 람다 센서의 표면에 불연소된 카본 및 불연소화합물에 의한 이상인지를 점검함으로써 람다 센서의 자체적인 고장이 아니라, 그 표면에 묻은 불연소된 카본 및 불연소화합물에 의한 것이면 차량을 출고할 수 있도록 하는 람다 센서의이상 점검 방법에 관한 것이다. 
       
     람다 센서, 최초 시동, 엔진, 온도, 불연소, 고장
Patent KR-20090049228-A (KR)
Title: 가변식 냉기 배출 구조
Inventor: JANG DONG SIK
IPC: F25D17/04
Filed: 2007-11-13
Abstract: 본 발명은 가변식 냉기 배출 구조에 관한 것으로, 저장물이 수납되는 본체, 상기 본체의 내측 뒷면에 설치되어 본체 내측으로 냉기를 공급하는 냉기 배출부, 상기 냉기 배출부의 일측에서 연결되어 본체 내부 측면으로 형성되는 냉기 덕트, 상기 냉기 덕트에 형성된 측면 배출홀, 도어의 개폐에 따라 상기 측면 배출홀을 개폐시키는 개폐기로 구성된다. 
     이에 따라, 도어의 개폐에 따라 측면 배출홀이 개폐되어 냉동실의 도어가 닫혀 있을 때에는 측면을 통해서도 냉동실로 냉기가 공급되어 저장물의 냉각 속도가 증대되고, 냉동실의 도어가 열려있을 때에는 측면에서 제공되던 냉기가 차단하여 냉기의 손실을 방지하는 효과가 있다.  
       
     도어, 개폐기, 측면 배출홀
Patent KR-20090049367-A (KR)
Inventor: CHO SUNG GU
IPC: A01B73/00
Filed: 2007-11-13
Abstract: 본 발명은 트랙터용 다기능 운반장치에 관한 것으로, 프레임(2)에 축핀(8)(10)으로 연결되어 유압실린더(12)에 의해 회전작동하는 좌우작동체(4)(6)의 지지봉(14)(16)에 각각 안내봉(32)(34)을 회전가능케 결합하거나 또는 집게(40)(42)를 결합하여 가축사료용 베일(B)의 운반 및 적재와 베일에 랩핑된 비닐을 벗겨내는 작업시에도 이용할 수 있도록 하고 또 지게발(50)(52)이나 버킷(62)(64)까지도 결합하여 사용할 수 있도록 함으로서 크기나 형태를 달리하는 다양한 적재물의 운반 및 적재용으로 이용할 수 있도록 함은 물론 이용가치를 높여줄 수 있도록 한 것이다.
Patent KR-20090051341-A (KR)
Inventor: JEONG HA MOON
IPC: B23K9/02
Filed: 2007-11-19
Abstract: 본 발명은 수직으로 놓인 상.하부모재를 횡방향 용접시에 상광하협의 형태로 만곡지게 형성되는 비드홈을 통해 용접가스가 원활히 배출되도록 하여 용접면의 관찰을 용이하게 하고, 가스압력에 의한 이면비드의 기공발생을 방지하여 견고하며, 또한 모양이 균일한 이면비드가 형성될 수 있는 횡방향 용접용 용접지지구 및 그 용접방법에 관한 것이다. 
     본 발명은 세라믹으로 이루어진 육면체 몸체와; 지지구의 중심선을 상부모재의 하단에 일치시켜서 상부 및 하부모재의 이면에 부착시킬 때, 홈의 상측으로 생성되는 이면비드의 상측과 홈사이에 용접가스의 배출통로가 형성되고, 중간 부분부터 하단 사이의 하부모재와의 사이에 형성되는 공간형상이 원하는 이면비드의 하측형상에 대응하도록 상측으로부터 하측으로 진행함에 따라 점차적으로 홈의 깊이가 감소하는 비대칭형 단면 형상을 이루는 비드홈과; 비드홈의 내측면에 지지구의 중간에 수평방향으로 형성되는 중심선과, 지지구의 이면에 중심선과 대응한 레벨로 돌출된 정렬돌기중 적어도 어느 하나의 얼라이너를 포함하며, 얼라이너를 상부모재의 하단에 정렬시킨 상태로 용접이 이루어지는 것을 특징으로 한다. 
       
     횡방향 용접, 비드홈, 용접지지구, 세라믹
Patent KR-20090051373-A (KR)
Inventor: PARK JEONG MAN
IPC: H01M2/02
Filed: 2007-11-19
Abstract: 본 발명은 배터리 팩에 관한 것으로, 베어 셀과 상부 커버의 결착력을 향상시킬 수 있으며, 외부 충격에 의한 변형, 비틀림, 구부러짐을 방지할 수 있는 배터리 팩에 관한 것이다. 
     본 발명은 결합 홈이 형성된 베어 셀, 상기 베어 셀의 일측에 위치하며, 상기 결합 홈에 대응하는 결합 홀이 형성되는 상부 커버를 포함하고, 상기 결합 홈 및 상기 결합 홀에 스크루가 삽입되어 상기 베어 셀과 상기 상부 커버를 결합시키는 배터리 팩에 있어서, 상기 결합 홈은 내부로 들어갈수록 직경이 작아지는 것을 특징으로 한다. 
     따라서, 베어 셀과 상부 커버의 결착력을 향상시킬 수 있으며, 외부 충격에 의한 변형, 비틀림, 구부러짐을 방지할 수 있다. 
     또한, 결합이 느슨해지면서 서로 다른 재료인 이차 전지와 스크루 간의 저항이 증가하는 것을 방지할 수 있으므로, 내부 저항이 증가하는 것을 방지할 수 있다. 
       
      배터리 팩, 베어 셀, 상부 커버, 스크루, 결합, 결착력
Patent KR-20090058996-A (KR)
Title: Cng tank assembly of a cng carrier
Inventor: KEUM CHUNG YON
IPC: B63B25/08
Filed: 2007-12-05
Abstract: A CNG(Compressed Natural Gas) tank assembly of a CNG carrier is provided to reduce the cost and time for manufacturing a CNG tank assembly of laminated structure, and to facilitate maintenance, repair and replacement of each CNG tank. A CNG tank assembly of a CNG carrier comprises a plurality of CNG tanks(110) laminated vertically and a plurality of fastening units(120) arranged along the edges of the CNG tanks between the CNG tanks to join the tanks detachably. The fastening unit is made up of a fixing bracket(121), a fixing piece(122), and a fixing bar(123). The fixing bracket is installed on one of laminated surfaces(111) the CNG tanks facing each other, and has a mounting space opened to one side and horizontally penetrated by a first fastening hole(121b). The fixing piece is installed on the other of the laminated surfaces to be inserted into the mounting space of the fixing bracket, and has a second fastening hole aligned with the first fastening hole. The fixing bar is inserted into the first and the second fastening hole to suppress the separation of the fixing piece and the fixing bracket.
Patent KR-20080055661-A (KR)
Title: Process for the preparation of isocyanates in the gas phase
Inventor: POHL FRITZ
IPC: C07C263/18
Filed: 2007-12-12
Abstract: A process for preparing an isocyanate is provided to allow rapid termination of a reaction after the reaction reaches an optimized retention time, to facilitate separation of the isocyanate, to increase the content of isocyanate in a product, and to improve the energy efficiency. A process for preparing an isocyanate by reacting a primary amine with phosgene comprises the steps of: (a) reacting phosgene with the primary amine in a reaction chamber at a temperature higher than the boiling point of the amine within an average contact time of 0.05-15 seconds to form a gaseous isocyanate-containing mixture; (b) cooling the gaseous isocyanate-containing mixture discharged from the reaction chamber through the following step (c) to condense the isocyanate; (c) cooling the mixture in at least two cooling zones aligned in series in a cooling stretch in a single stage via direct cooling; and (d) washing the gaseous mixture of step (b) with a washing liquid to separate non-condensed isocyanate from the gaseous mixture.
Patent KR-20090061895-A (KR)
Title: Reinforcing structure of center pillar for automobile
Inventor: KWON O SUNG
IPC: B62D25/00
Filed: 2007-12-12
Abstract: A center pillar reinforcing structure for vehicles is provided to ensure resistivity against dynamic broad-collision energy and static roof-crush energy by installing a pipe-like reinforcing member between a center pillar outer panel and a center pillar inner panel. A center pillar reinforcing structure for vehicles comprises a pipe-like reinforcing member(50) installed between a center pillar outer panel and a center pillar inner panel. The pipe-like reinforcing member is manufactured by a hydro forming method and therefore has a closed curve. The pipe-like reinforcing member includes; a fastening unit(51) to fasten a seat belt anchor located on an upper side and a middle side; and a hinge mounting hole(53) wherein a 'U'-shaped bulk head bracket(52) is inserted.
Patent KR-20090062306-A (KR)
Inventor: JANG SAM SEOK
IPC: E05B83/18
Filed: 2007-12-12
Abstract: 본 발명은 전동식으로 테일게이트를 개방하되, 고장시 상기 테일게이트를 개방시킬 수 있도록 베이스 플레이트에 회전가능하게 설치되며, 비상커버의 개방시 조작될 수 있도록 노출되는 비상레버를 포함하는 차량용 테일게이트 래치에 있어서, 상기 비상레버의 회전궤도에 진입 및 이탈되도록 상기 베이스 플레이트에 탄성적으로 지지되는 스토퍼부를 포함하는 차량용 테일게이트 래치이며, 상기 스토퍼부를 상기 비상레버의 회전궤도에서 이탈시키기 위해서는 상기 스토퍼부를 차량의 내측에서 조작해야 하기 때문에 차량의 외측에서 테일게이트의 와이어링홀을 통해 상기 비상레버를 회전시킬 수 없어 차량의 도난을 방지할 수 있는 장점이 있다. 
       
     	테일게이트, 비상레버, 락바, 스프링, 락바 밴드
Patent KR-20090063422-A (KR)
Title: Cooking appliance
Inventor: LEE SEUNG JUN
IPC: F24C7/06
Filed: 2007-12-14
Abstract: A cooker is provided to maximize aperture ratio of an opening since a barrier for shielding an opening of a cavity is formed with a grid structure. A cooker comprises a heater assembly(30) in which a heater(31) for heating up the cooking material is equipped, a cavity(10) which forms a cooking chamber cavity(11) in which the cooking material is admitted and wherein the light generated in heater or the opening(13) in which the heat passes through is formed, and a barrier(40) in which a cover unit(43) covering the opening is equipped.
Patent KR-20090067427-A (KR)
Title: Apparatus and method for controlling the ratio of vapor and carbon used in molten carbonate fuel cell
Inventor: LEE JONG GYU
IPC: H01M8/06
Filed: 2007-12-21
Abstract: An apparatus for controlling a ratio of vapor and carbon used in a molten carbonate fuel cell and a method thereof are provided to maintain the temperature of a humidifier uniformly by supplying pure water to heat-exchanged vapor, mixing them and supplying the mixture to the humidifier. An apparatus for controlling a ratio of vapor and carbon used in a molten carbonate fuel cell comprises a devulcanizer(20) which is provided with the natural gas fuel(10) containing methane and removes a sulfur compound; a humidifier(30) controlling a vapor/carbon ratio of natural gas fuel from which the sulfur compound is removed; a reformer(40) reforming methane gas of natural gas fuel controlled with steam vapor/carbon ratio into the hydrogen gas; a fuel cell stack(50) which is together provided reformed hydrogen and oxygen and generates the electricity; and a waste heat recovering system of normal fuel battery exhaust gas supplying gas of high temperature ejected form a fuel cell stack to the humidifier.
Patent KR-20090073646-A (KR)
Title: Liquid cyrstal display device and method for driving the same
Inventor: SONG SANG HEE
IPC: G09G3/20
Filed: 2007-12-31
Abstract: A liquid crystal display device and a method for driving the same are provided to prevent the abnormal operation by accurately determining whether the power of liquid crystal display is on or off. A liquid crystal display comprises gate lines(GL1 to GLn), data lines(DL1 to DLm), pixel cells(PXL), a gate driver(14) and a discharge unit(22). The gate line intersects with the data line. Pixel cells are defined between the gate lines and the data lines. The gate driver supplies the scan pulse to the gate lines. The scan pulse has the gate high and low voltages. The discharge unit compares the driving voltage with the standard value. The discharge unit controls the level of the gate low voltage of the gate driver according to the comparison result of the driving voltage and the standard value.
Patent KR-20070045258-A (KR)
Inventor: TRAMONTINA PAUL FRANCIS
IPC: B65H19/00
Filed: 2005-04-06
Abstract: 시트 재료의 롤을 저장 및 분배하기 위한 분배기(10)는 하우징 내부에 시트 재료의 주 롤과 시트 재료의 백업 롤을 회전식으로 지지하도록 구성되는 하우징(12)을 포함한다.  분배기는 시트 재료의 주 롤의 실질적인 고갈 이전에는 시트 재료의 백업 롤의 회전을 실질적으로 제한하기 위한 수단을 더 포함한다.  하우징은 또한 방출 포트(34)를 포함한다.  분배기는 실질적으로 방출 포트 내에 이동식으로 위치되고 방출 포트를 부분적으로 차단하는 분배 제어 부재(60)를 포함한다.  분배 제어 부재는 시트 재료의 주 롤의 실질적인 고갈 이전에는 시트 재료의 백업 롤의 회전을 실질적으로 제한하도록 구성된다. 
       
     분배기, 분배 제어 부재, 방출 포트, 주 롤, 백업 롤, 시트 재료
Patent KR-20070044068-A (KR)
Inventor: YUZAKI KEIICHIRO
IPC: F02B23/06
Filed: 2005-09-29
Abstract: 연소실 형상을 최적으로 함으로써, 특히 팽창행정일 때의 혼합을 촉진하고, 리타드 한계의 개선 및, 높은 EGR 하에서의 연소속도 증가 등에 의해, PM 저감과 NOx 저감의 양립을 도모한다. 피스톤의 정상부에 형성된 연소실(12)의 내부를, 이 연소실 내부의 중심축선(O2)을 통과하는 종단면 형상이 이 중심축선을 기준으로 해서 대칭형상이 되도록 형성하고, 연소실(12)의 상단 개구부(18)를 R부(21)와 직선부(22)를 조합시킨 대략 다각형상으로 형성한다.
Patent KR-20070091103-A (KR)
Title: Process for the synthesis of soluble, high molecular weight polymers
Inventor: MOLOCK FRANK
IPC: C08F2/50
Filed: 2005-10-19
Abstract: The present invention relates to a process comprising polymerizing via irradiation from a light source, a reaction mixture comprising at least one monomer and at least one photoinitiator wherein at least about 90% of incident light emitted by the light source is filtered to produce a soluble, high molecular weight polymer.
Patent KR-20070102997-A (KR)
Title: Solid-state image pickup device
Inventor: SUGIYAMA YUKINOBU
IPC: H04N5/351
Filed: 2006-02-02
Abstract: A solid-state image pickup device which can perform high speed image reading is provided. Since all the nth pixel columns (N1) in image pickup blocks (B1, B2, B3) are connectable to an nth processing circuit (for instance, a processing circuit (PU1)) through switches (Q (1), Q(4), Q(7)), even when a partial read out region (R) is small, a signal from an adjacent pixel column (N2) is separately processed by a different processing circuit (PU2). Furthermore, since a read out region is limited to the partial read out region (R) by an image data operating section (10), higher speed image pickup can be performed.
Patent KR-20070086928-A (KR)
Title: Mc-cdma multiplexing in an orthogonal uplink
Inventor: SUTIVONG ARAK
IPC: H04B1/69
Filed: 2005-12-22
Abstract: Techniques are provided to support multi-carrier code division multiple access (MC-CDMA) in an orthogonal uplink of a wireless communication system. A method of wireless multi-carrier communications comprises dividing sub-carriers on an uplink into non-overlapping groups, allocating a time-frequency block including a hopping duration and a non-overlapped group, respectively, assigning a different set of orthogonal codes to each user, spreading data (or pilot) symbols of each user over the allocated time-frequency block, wherein the data (or pilot) symbols of each user are spread using the different set of orthogonal codes assigned to each user, mapping each data (or pilot) symbol to a modulation symbol in the time-frequency block, generating an orthogonal waveform based on the mapped symbols, and transmitting the orthogonal waveform.
Patent KR-20070090255-A (KR)
Title: Imaging forming apparatus
Inventor: SASAKI SHINO
IPC: B41J2/01
Filed: 2006-11-30
Abstract: An image forming apparatus is disclosed that includes a recording head including a nozzle from which liquid droplets are ejected, a pressure chamber communicating with the nozzle and containing liquid, and a pressure generation part changing the volume of the pressure chamber; and a drive signal generation part generating a drive signal including multiple drive pulses and causing the pressure generation part to operate so that the liquid droplets are ejected. The drive signal generated by the drive signal generation part includes, within a single print cycle, a resonant drive pulse causing a first one of the liquid droplets to be ejected using the natural vibration period of the pressure chamber, a non-resonant drive pulse causing a second one of the liquid droplets to be ejected without using the natural vibration period of the pressure chamber, and a slight drive pulse prevented from causing the ink droplets to be ejected.