Patents by Inventor Keon Kuk
Keon Kuk has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7367656Abstract: In an ink-jet printhead and a method for manufacturing the same, the ink-jet printhead includes a substrate, an ink chamber to be filled with ink to be ejected formed on an upper surface of the substrate, a restrictor, which is a path through which ink is supplied from an ink reservoir to the ink chamber, perforating a bottom surface of the substrate and a bottom surface of the ink chamber, a nozzle plate, which is stacked on the upper surface of the substrate and forms an upper wall of the ink chamber, a nozzle perforating the nozzle plate at a position corresponding to a center of the ink chamber, a heater formed in the nozzle plate to surround the nozzle, and a conductor for applying a current to the heater.Type: GrantFiled: February 9, 2004Date of Patent: May 6, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Chang-ho Cho, Yong-soo Oh, Keon Kuk, Jong-woo Shin
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Publication number: 20080049073Abstract: An inkjet printhead and a method of manufacturing the same. The inkjet printhead includes a substrate including one or more ink feed holes to supply ink, which penetrates through the substrate, a chamber layer stacked on the substrate and including a plurality of ink chambers, in which the ink supplied from the ink feed hole is filled, a nozzle layer stacked on the chamber layer and including a plurality of nozzles, through which the ink is ejected, and a support member attached on a lower surface of the substrate to support the substrate.Type: ApplicationFiled: February 13, 2007Publication date: February 28, 2008Applicant: Samsung Electronics Co., Ltd.Inventors: Moon-chul Lee, Sang-hyun Kim, Dong-sik Shim, Hyung Choi, Keon Kuk, Yong-seop Yoon
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Publication number: 20070229609Abstract: An inkjet printhead includes an ejecting portion including an ink chamber to store ink, a nozzle to eject the ink stored in the ink chamber, and an actuator to generate an ink ejecting force, a supplying portion to refill the ink chamber with ink, a connecting portion to connect the ejecting portion and the supplying portion, and a backflow restrictor formed at the connecting portion to create a higher flow resistance against an ink backflow to the supplying portion than against an ink refill flow to the ejecting portion, the backflow restrictor including an converging region and an expansion region that are sequentially formed.Type: ApplicationFiled: November 28, 2006Publication date: October 4, 2007Applicant: Samsung Electronics Co., Ltd.Inventors: Min-soo Kim, Keon Kuk, Bang-weon Lee
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Patent number: 7275308Abstract: A method for manufacturing the same, wherein the monolithic ink-jet printhead includes a manifold for supplying ink, an ink chamber having a hemispheric shape, and an ink channel formed monolithically on a substrate; a silicon oxide layer, in which a nozzle for ejecting ink is centrally formed in the ink chamber, is deposited on the substrate; a heater having a ring shape is formed on the silicon oxide layer to surround the nozzle; a MOS integrated circuit is mounted on the substrate to drive the heater and includes a MOSFET and electrodes connected to the heater. The silicon oxide layer, the heater, and the MOS integrated circuit are formed monolithically on the substrate. Additionally, a DLC coating layer having a high hydrophobic property and high durability is formed on an external surface of the printhead.Type: GrantFiled: December 22, 2003Date of Patent: October 2, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Hyeon-cheol Kim, Yong-soo Oh, Keon Kuk, Kwang-joon Yoon, Jae-sik Min, Sang-hyun Lee, Chang-seung Lee, Seog Soon Baek, Sang-wook Lee, Jong-cheol Shin
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Publication number: 20070188558Abstract: A thermally-driven ink-jet printhead includes a substrate having an ink chamber to be filled with ink to be ejected, a manifold for supplying ink, and an ink channel for providing flow communication therebetween. First and second sidewalls are formed to a predetermined depth from an upper surface of the substrate and define the ink chamber to have a substantially rectangular shape. A nozzle plate including a plurality of material layers is formed on the substrate. A nozzle passes through the nozzle plate and is in flow communication with the ink chamber. A heater is disposed between the nozzle and one of the first sidewalls above the ink chamber. A conductor is electrically connected to the heater. The conductor and the heater are disposed within the nozzle plate. A shifting feature moves cavitation points beyond an outer edge of the heater.Type: ApplicationFiled: March 22, 2007Publication date: August 16, 2007Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Keon Kuk, Seung-joo Shin, Dong-kee Sohn, Yong-soo Lee, Yong-soo Oh, Ji-hyuk Lim, Seog-soon Baek, Mun-cheol Choi
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Patent number: 7240994Abstract: A method of driving an ink-jet printhead, which heats ink contained in an ink chamber using a heater to generate and expand a bubble within the ink chamber and ejects ink from the ink chamber using an expansive force of the bubble, the method including applying a main pulse to the heater to eject ink and applying a post pulse to the heater after ink has been ejected.Type: GrantFiled: July 2, 2004Date of Patent: July 10, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Dong-kee Sohn, Keon Kuk, Mun-cheol Choi, Yong-soo Oh
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Publication number: 20070153047Abstract: An ink path structure, an inkjet printhead having the same and a method of manufacturing the inkjet printhead includes an ink chamber in which ink to be ejected is filled, nozzles through which ink is ejected from the ink chamber, an ink feed hole through which ink is supplied to the ink chamber, a first stopper protruding from an inner wall of a path between the ink chamber and the ink feed hole, a second stopper separated from the first stopper in a direction of the ink chamber, and a moving element installed movably between the first and second stoppers to open and close the path between the ink chamber and the ink feed hole.Type: ApplicationFiled: August 22, 2006Publication date: July 5, 2007Applicant: Samsung Electronics Co., Ltd.Inventors: Keon Kuk, Min-soo Kim, Bang-weon Lee, You-seop Lee
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Publication number: 20070146451Abstract: An ink path structure and an inkjet printhead including an ink chamber to be filled with ink to be ejected, a nozzle through which the ink in the ink chamber is ejected, an ink feed hole to supply the ink to the ink chamber, and a restrictor connecting the ink chamber and the ink feed hole, the restrictor including a flow resistance control portion in which an ink path toward the ink feed hole is formed to be longer than an ink path toward the ink chamber such that a flow resistance toward the ink feed hole greater than a flow resistance toward the ink chamber.Type: ApplicationFiled: August 17, 2006Publication date: June 28, 2007Applicant: Samsung Electronics Co., Ltd.Inventors: Bang-Weon Lee, Mio-soo Kim, Keon Kuk
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Publication number: 20070139482Abstract: An inkjet printhead is provided. The inkjet printhead includes an ink chamber filled with ink to be ejected, a nozzle through which the ink is ejected from the ink chamber, a manifold to supply the ink to the ink chamber, and a restrictor that connects the ink chamber and the manifold and includes a protrusion formed on an inner wall of the restrictor. A main heater is formed on an inner wall of the ink chamber and generates a main bubble in the ink chamber to eject ink and an auxiliary heater is formed on an inner wall of the restrictor and generates an auxiliary bubble to suppress the main bubble in the restrictor from expanding toward the restrictor. Thus, a refill speed of the ink to the ink chamber is increased and a driving frequency of the inkjet printhead is also increased.Type: ApplicationFiled: July 11, 2006Publication date: June 21, 2007Applicant: Samsung Electronics Co., Ltd.Inventors: You-seop Lee, Keon Kuk, Bang-weon Lee
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Patent number: 7210766Abstract: A thermally-driven ink-jet printhead includes a substrate having an ink chamber to be filled with ink to be ejected, a manifold for supplying ink, and an ink channel for providing flow communication therebetween. First and second sidewalls are formed to a predetermined depth from an upper surface of the substrate and define the ink chamber to have a substantially rectangular shape. A nozzle plate including a plurality of material layers is formed on the substrate. A nozzle passes through the nozzle plate and is in flow communication with the ink chamber. A heater is disposed between the nozzle and one of the first sidewalls above the ink chamber. A conductor is electrically connected to the heater. The conductor and the heater are disposed within the nozzle plate. A shifting feature moves cavitation points beyond an outer edge of the heater.Type: GrantFiled: June 24, 2004Date of Patent: May 1, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Keon Kuk, Seung-joo Shin, Dong-kee Sohn, Yong-soo Lee, Yong-soo Oh, Ji-hyuk Lim, Seog-soon Baek, Mun-cheol Choi
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Patent number: 7207662Abstract: An ink-jet printhead includes a substrate having an ink chamber and a manifold, a nozzle plate formed on the substrate, first and second heaters and conductors, a material layer, and a plurality of ink channels. The nozzle plate includes a plurality of passivation layers formed of an insulating material, a heat dissipation layer formed on the plurality of passivation layers and made of a thermally conductive material, and a nozzle passing through the nozzle plate and in flow communication with the ink chamber. The first and second heaters and conductors are interposed between adjacent passivation layers of the nozzle plate. The material layer is interposed between the ink chamber and the manifold to form a bottom wall of the ink chamber and a top wall of the manifold. The plurality of ink channels is formed in the material layer to provide flow communication between the ink chamber and the manifold.Type: GrantFiled: June 21, 2004Date of Patent: April 24, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Seung-joo Shin, Yong-soo Oh, Su-ho Shin, Min-soo Kim, Hyung-taek Lim, Chang-seung Lee, You-seop Lee, Keon Kuk
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Patent number: 7201461Abstract: An apparatus for controlling a temperature of an ink-jet printhead includes a heater driving field effect transistor (FET) connected to a heater, the heater driving FET for applying a heater voltage to the heater according to a waveform input to a gate of the heater driving FET, a current sensor for converting current flowing between a drain and a source of the heater driving FET into a voltage and for outputting the voltage, a comparator for comparing the voltage output from the current sensor with a predetermined reference voltage, a warming control signal generator for generating a warming control signal in a form of a pulse string, and a switching unit for receiving an output signal from the comparator and the warming control signal, and for outputting the warming control signal according to a level of the output signal from the comparator to the gate of the heater driving FET.Type: GrantFiled: November 19, 2004Date of Patent: April 10, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Young-jae Kim, Keon Kuk, Yong-soo Oh
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Patent number: 7163278Abstract: An ink-jet printhead includes a substrate having an ink chamber and a manifold, a nozzle plate formed on the substrate, first and second heaters, first and second conductors, and first and second ink channels. The nozzle plate includes a plurality of passivation layers formed of an insulating material, a heat dissipation layer formed on the passivation layers and made of a thermally conductive material, and a nozzle passing through the nozzle plate and in flow communication with the ink chamber. The first and second heaters and conductors are interposed between adjacent passivation layers of the nozzle plate. The ink channels are interposed between the ink chamber and the manifold, for providing flow communication between the ink chamber and the manifold. The first and second heaters, conductors and ink channels are symmetric with respect to the nozzle.Type: GrantFiled: June 10, 2004Date of Patent: January 16, 2007Assignee: Samsung Electronics Co., Ltd.Inventors: Yong-soo Lee, Yong-soo Oh, Keon Kuk, Ji-hyuk Lim, Dong-kee Sohn, Mun-cheol Choi
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Publication number: 20060238575Abstract: A monolithic ink-jet printhead includes a substrate having an ink chamber to be supplied with ink to be ejected on a front surface thereof, a manifold for supplying ink to the ink chamber on a rear surface thereof, and an ink channel in communication with the ink chamber and the manifold, a nozzle plate including a plurality of passivation layers stacked on the substrate and a heat dissipating layer overlying the passivation layers, the nozzle plate having a nozzle penetrating the nozzle plate, a heater formed between adjacent passivation layers and located above the ink chamber for heating the ink to be supplied within the ink chamber, and a conductor provided between adjacent passivation layers, the conductor being electrically connected to the heater for applying current across the heater, wherein the heat dissipating layer is made of a thermally conductive metal for dissipating heat from the heater.Type: ApplicationFiled: June 26, 2006Publication date: October 26, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Su-ho Shin, Yong-soo Oh, Keon Kuk, Hyung-taek Lim, Chang-seung Lee, Seung-ju Shin, Min-soo Kim, You-seop Lee
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Publication number: 20060216725Abstract: A polymerase chain reaction apparatus includes: a substrate; a high-temperature sidewall erected on the substrate; a low-temperature sidewall erected on the substrate and facing the high-temperature sidewall; and a reaction chamber consisting of the substrate, the high-temperature sidewall, and the low-temperature sidewall, wherein a sample contained in the reaction chamber is repetitively thermal-circulated between the high-temperature sidewall and the low-temperature sidewall using Marangoni convection generated by a surface tension gradient resulting from a temperature difference in an interface between the sample and air. The PCR amplification can be automatically accomplished by surface tension flow generated by Marangoni convection resulting from a temperature difference in an interface between the sample and air when a temperature difference between the sidewalls of the chamber is maintained constant.Type: ApplicationFiled: September 2, 2005Publication date: September 28, 2006Inventors: You-seop Lee, Keon Kuk, Yong-soo Oh, Su-ho Shin, Min-soo Kim
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Patent number: 7101024Abstract: An ink-jet printhead includes an ink chamber to be filled with ink to be ejected, a manifold, which supplies ink to the ink chamber, an ink channel, which provides communication between the ink chamber and the manifold, a nozzle through which ink is ejected from the ink chamber, first and second heaters, which heat ink in the ink chamber to generate bubbles, and a conductor, which is electrically connected to the first and second heaters and applies a current to the first and second heaters, wherein the first and second heaters are positioned symmetrically around a center of the nozzle, and one of the first and second heaters is positioned adjacent to the ink channel.Type: GrantFiled: January 15, 2004Date of Patent: September 5, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Ji-hyuk Lim, Seog-soon Baek, Yong-soo Oh, Keon Kuk, Seung-joo Shin, Dong-kee Sohn, Min-soo Kim, Yong-soo Lee
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Publication number: 20060165878Abstract: An apparatus and method for fabricating a color filter by printing pixels on a substrate using an ink jet head, optically analyzing pixel quality and controlling printing in accordance with the pixel quality. Optically analyzing may include analyzing a number of ink droplets or a transmittance of a printed pixel.Type: ApplicationFiled: January 20, 2006Publication date: July 27, 2006Inventors: Min-soo Kim, Seung-joo Shin, Seong-jin Kim, Seog-soon Baek, Yong-soo Lee, Keon Kuk
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Patent number: 7073891Abstract: A monolithic ink-jet printhead includes a substrate having an ink chamber to be supplied with ink to be ejected on a front surface thereof, a manifold for supplying ink to the ink chamber on a rear surface thereof, and an ink channel in communication with the ink chamber and the manifold, a nozzle plate including a plurality of passivation layers stacked on the substrate and a heat dissipating layer overlying the passivation layers, the nozzle plate having a nozzle penetrating the nozzle plate, a heater formed between adjacent passivation layers and located above the ink chamber for heating the ink to be supplied within the ink chamber, and a conductor provided between adjacent passivation layers, the conductor being electrically connected to the heater for applying current across the heater, wherein the heat dissipating layer is made of a thermally conductive metal for dissipating heat from the heater.Type: GrantFiled: October 14, 2003Date of Patent: July 11, 2006Assignee: Samsung Electronics Co., Ltd.Inventors: Su-ho Shin, Yong-soo Oh, Keon Kuk, Hyung-taek Lim, Chang-seung Lee, Seung-ju Shin, Min-soo Kim, You-seop Lee
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Publication number: 20060146093Abstract: A monolithic ink-jet printhead includes a substrate having a lower ink chamber formed on an upper surface thereof, a manifold for supplying ink to the lower ink chamber formed on a bottom surface thereof, and an ink channel providing communication therebetween; a nozzle plate having a plurality of passivation layers and a metal layer sequentially stacked on the substrate, the nozzle plate having an upper ink chamber formed therein on a bottom surface of the metal layer, a nozzle in communication with the upper ink chamber formed on an upper surface of the metal layer, and a connection hole providing communication between the upper ink chamber and the lower ink chamber; a heater located between the upper ink chamber and the lower ink chamber for heating ink contained in the lower and upper ink chambers; and a conductor electrically connected to the heater to apply a current to the heater.Type: ApplicationFiled: February 28, 2006Publication date: July 6, 2006Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Hoon Song, Yong-soo Oh, Jun-hyub Park, Keon Kuk, Chang-seung Lee, Young-jae Kim, Ji-hyuk Lim
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Publication number: 20060092224Abstract: A nozzle plate, inkjet printhead with the same and method of manufacturing the same. The nozzle plate includes at least one nozzle and has at least one heater segment disposed adjacent to the nozzle. The heater segment is configured to heat a first fraction of the circumference to a greater degree than a second fraction of the circumference. Heater segments are disposed at intervals around a circumference of the nozzle and are independently operable.Type: ApplicationFiled: October 28, 2005Publication date: May 4, 2006Inventors: Gee-young Sung, Kye-si Kwon, Seong-jin Kim, Keon Kuk, Seung-joo Shin, Seog-soon Baek