Patents by Inventor Dong-cheol Ahn
Dong-cheol Ahn 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: 11973960Abstract: A video encoding/decoding apparatus according to the present invention acquires motion vector refinement information, performs motion compensation on the basis of a motion vector of a current block, refines the motion vector of the current block using at least one or both of the motion vector refinement information and the output of the motion compensation, and performs motion compensation using the refined motion vector.Type: GrantFiled: June 9, 2022Date of Patent: April 30, 2024Assignee: INTELLECTUAL DISCOVERY CO., LTD.Inventors: Yong Jo Ahn, Dong Gyu Sim, Ho Chan Ryu, Seanae Park, Byung Tae Oh, Byung Cheol Song
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Patent number: 9465354Abstract: An imaging cartridge includes a photoconductive unit including a photoconductor on which an elastic latent image is formed; a development unit including a development roller that supplies toner to the photoconductor to develop the toner and a gap maintaining member that constrains an approach distance of the development roller with respect to the photoconductor; a first position determining portion provided in the development unit; a lateral bracket that is fixed to a side portion of the photoconductive unit and has a second position determining portion that guides the first position determining portion so as to movably support the development unit; and an elastic member that applies to the development unit an elastic force in a direction in which the development roller approaches the photoconductive unit.Type: GrantFiled: January 8, 2015Date of Patent: October 11, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Seung-chan Park, Dong-cheol Ahn, Sang-hoon Lee, Seong-ho Jeong
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Publication number: 20150323897Abstract: An imaging cartridge includes a photoconductive unit including a photoconductor on which an elastic latent image is formed; a development unit including a development roller that supplies toner to the photoconductor to develop the toner and a gap maintaining member that constrains an approach distance of the development roller with respect to the photoconductor; a first position determining portion provided in the development unit; a lateral bracket that is fixed to a side portion of the photoconductive unit and has a second position determining portion that guides the first position determining portion so as to movably support the development unit; and an elastic member that applies to the development unit an elastic force in a direction in which the development roller approaches the photoconductive unit.Type: ApplicationFiled: January 8, 2015Publication date: November 12, 2015Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Seung-chan PARK, Dong-cheol AHN, Sang-hoon LEE, Seong-ho JEONG
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Patent number: 9182739Abstract: An electrophotographic image forming apparatus is provided including a body including an opening and a first coupler, a photoreceptor cartridge including a second coupler connected to the first coupler, a first gear connected to the second coupler, and a mounting portion, and attached to or detached from the body through the opening; and a development cartridge including a second gear connected to the first gear and attached or detached from the mounting portion through the opening while the photoreceptor cartridge is mounted in the body.Type: GrantFiled: August 30, 2013Date of Patent: November 10, 2015Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Sang-hoon Lee, Young-chae Kim, Sang-jin Park, Dong-cheol Ahn, Ki-hyun Yoo, Seung-gweon Lee, Ho-jin Jang
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Publication number: 20140205318Abstract: An electrophotographic image forming apparatus is provided including a body including an opening and a first coupler, a photoreceptor cartridge including a second coupler connected to the first coupler, a first gear connected to the second coupler, and a mounting portion, and attached to or detached from the body through the opening; and a development cartridge including a second gear connected to the first gear and attached or detached from the mounting portion through the opening while the photoreceptor cartridge is mounted in the body.Type: ApplicationFiled: August 30, 2013Publication date: July 24, 2014Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Sang-hoon LEE, Young-chae Kim, Sang-jin Park, Dong-cheol Ahn, Ki-hyun Yoo, Seung-gweon Lee, Ho-jin Jang
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Patent number: 8706006Abstract: A developing device that attaches/detaches to/from a main body of an image forming apparatus includes a photosensitive drum, a charging roller to rotate while contacting the photosensitive drum to charge a surface of the photosensitive drum to a uniform potential, and a separating member to rotate between a first position where the charging roller is separated from the photosensitive drum and a second position where the charging roller contacts the photosensitive drum. The separating member includes a body into which a rotary shaft of the charging roller is inserted to be rotatable, and a contact portion extending from the body and contacting the surface of the photosensitive drum when the separating member is located at the first position so as to separate the charging roller from the photosensitive drum, wherein the contact portion includes a friction member including rubber.Type: GrantFiled: May 23, 2012Date of Patent: April 22, 2014Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Jong-in Kim, Sung-gi Kim, Dong-cheol Ahn, Sang-hoon Lee
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Publication number: 20130129385Abstract: A developing device that attaches/detaches to/from a main body of an image forming apparatus includes a photosensitive drum, a charging roller to rotate while contacting the photosensitive drum to charge a surface of the photosensitive drum to a uniform potential, and a separating member to rotate between a first position where the charging roller is separated from the photosensitive drum and a second position where the charging roller contacts the photosensitive drum. The separating member includes a body into which a rotary shaft of the charging roller is inserted to be rotatable, and a contact portion extending from the body and contacting the surface of the photosensitive drum when the separating member is located at the first position so as to separate the charging roller from the photosensitive drum, wherein the contact portion includes a friction member including rubber.Type: ApplicationFiled: May 23, 2012Publication date: May 23, 2013Applicant: Samsung Electronics Co., LtdInventors: Jong-in KIM, Sung-gi KIM, Dong-cheol AHN, Sang-hoon LEE
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Patent number: 8238777Abstract: A developing device detachably coupled to an electrophotographic image forming apparatus which includes a housing including a photoconductive drum and at least one roller; and an electrical contact member disposed in the housing, connected to the at least one roller, and formed of a conductive metallic plate to provide an electrical path between the at least one roller and a power supply when the developing device is attached to the electrophotographic image forming apparatus, wherein the electrical contact member includes a base including a coupling unit to engage with the housing, a first elastic member to bend from the base in a first direction; a second elastic member to bend from the first elastic member in a second direction and including a contact to contact the at least one roller; and an anti-deformation unit to bend from the base and to face a surface of the first elastic member in the second direction of the second elastic member to prevent the first elastic member from bending in the second directType: GrantFiled: March 11, 2010Date of Patent: August 7, 2012Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Jong-in Kim, Jai-il Choi, Dong-cheol Ahn
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Patent number: 8121514Abstract: A developing device has a housing including a toner container containing toner, and a developing unit. The developing unit includes a developing roller and a photoconductive drum, and a barrier member including a toner supply window. The barrier member is combined with the housing to separate the toner container and the developing unit from each other. The developing unit also includes a blocking film that is attached to the barrier member to block the toner supply window. An end of the blocking film is exposed outside the housing through an opening formed in a sidewall of the housing. A bottom surface and first and second side surfaces of the barrier member are attached to a bottom surface and first and second side surfaces of the housing by using a welding process, and a distance between the first and second side surfaces of the barrier member and a distance between the first and second side surfaces of the housing increase from bottom to top.Type: GrantFiled: March 24, 2010Date of Patent: February 21, 2012Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Jong-in Kim, Min-sik Ji, Jai-il Choi, Dong-cheol Ahn
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Patent number: 8050581Abstract: An image forming apparatus and a control method thereof are disclosed. A charge unit charges a surface of an organic photo conductor (OPC) to a predetermined electric potential. A developing unit develops an electrostatic latent image formed on the surface of the OPC by coating a developer on the same. A power supply unit supplies power to the charge unit and the developing unit. A control unit regulates the power supplied to the charge unit and the developing unit. After a developing process in the developing unit, the control unit regulates the power applied to at least one of the charge unit and the developing unit so as to collect a residual developer on the surface of the OPC to the developing unit. Accordingly, contamination of the charge unit and the transfer unit can be prevented and an image of a good quality can be achieved.Type: GrantFiled: November 23, 2009Date of Patent: November 1, 2011Assignee: SAMSUNG Electronics Co., LtdInventors: Gun Soo Chang, Dong Cheol Ahn
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Patent number: 7995937Abstract: An image forming apparatus and a control method thereof are provided. The image forming apparatus includes: an image carrying body which includes a surface on which a developer which corresponds to printing data is applied; a transferring unit which receives transferring electric power to form a transferring area which transfers the developer to a transferring target body; a power supply unit which applies transferring electric power to the transferring unit; and a control unit which controls the power supply unit to apply first transferring electric power or second transferring electric power based on the amount of the developer in a unit section on a surface of the image carrying body. Thus, the present general inventive concept provides an image forming apparatus and a control method thereof for improving a printing image quality.Type: GrantFiled: March 24, 2009Date of Patent: August 9, 2011Assignee: Samsung Electronics Co., Ltd.Inventors: Jun-hee Lee, Dong-cheol Ahn
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Patent number: 7953346Abstract: An image forming apparatus having a developing cartridge includes a lower main body, and a developing cartridge installed in the lower main body and including a photosensitive medium. An upper main body may be separably installed on an upper side of the lower main body and includes an upper pressing member to press the developing cartridge downward. A lower pressing member, installed in the lower main body, is positioned to press the developing cartridge upward. In the case where a rotation axis of the photosensitive medium of the developing cartridge is set as a rotation center, a moment of force is applied to the developing cartridge by the upper pressing member and an opposing moment of force being is applied to the developing cartridge by the lower pressing member in the opposite direction.Type: GrantFiled: November 1, 2007Date of Patent: May 31, 2011Assignee: SAMSUNG Electronics Co., Ltd.Inventors: Dong-cheol Ahn, Young-min Kim
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Patent number: D727411Type: GrantFiled: September 30, 2013Date of Patent: April 21, 2015Assignee: Samsung Electronics Co., Ltd.Inventors: Ji-Won Moon, Seung-Chan Park, Dong-Cheol Ahn
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Patent number: D754247Type: GrantFiled: December 16, 2014Date of Patent: April 19, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Sang-Hoon Lee, Ji-Won Moon, Ho-Jin Jang, Seung-Chan Park, Dong-Cheol Ahn, Yong-Il Moon, Dong-Geun Lee, Yong-Kwan Cho
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Patent number: D754248Type: GrantFiled: December 17, 2014Date of Patent: April 19, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Ho-Jin Jang, Ji-Won Moon, Seung-Chan Park, Sang-Hoon Lee, Dong-Cheol Ahn, Yong-Il Moon, Dong-Geun Lee, Yong-Kwan Cho
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Patent number: D755283Type: GrantFiled: December 16, 2014Date of Patent: May 3, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Sang-Hoon Lee, Ji-Won Moon, Ho-Jin Jang, Seung-Chan Park, Dong-Cheol Ahn, Yong-Il Moon, Dong-Geun Lee, Yong-Kwan Cho
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Patent number: D755888Type: GrantFiled: December 17, 2014Date of Patent: May 10, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Sang-Hoon Lee, Ji-Won Moon, Ho-Jin Jang, Seung-Chan Park, Dong-Cheol Ahn, Yong-Il Moon, Dong-Geun Lee, Yong-Kwan Cho
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Patent number: D765164Type: GrantFiled: December 16, 2014Date of Patent: August 30, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Seung-Chan Park, Sang-Hoon Lee, Ji-Won Moon, Dong-Cheol Ahn, Ho-Jin Jang, Yong-Il Moon, Dong-Geun Lee, Yong-Kwan Cho
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Patent number: D807952Type: GrantFiled: December 29, 2014Date of Patent: January 16, 2018Assignee: S-PRINTING SOLUTION CO., LTD.Inventors: Ji-Won Moon, Seung-Chan Park, Dong-Cheol Ahn
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Patent number: D807953Type: GrantFiled: December 29, 2014Date of Patent: January 16, 2018Assignee: S-PRINTING SOLUTION CO., LTD.Inventors: Ji-Won Moon, Seung-Chan Park, Dong-Cheol Ahn