Patents by Inventor Jae-hwan Yoo
Jae-hwan Yoo 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: 9429748Abstract: A light scanning unit includes a light source to emit a light beam; a polygonal mirror to deflect the light beam in a main scanning direction; and an imaging optical system to image the light beam onto a scanning surface. The polygonal mirror includes a plurality of reflection surfaces that are formed in an outer portion of the polygonal mirror and rotate around a rotational axis and an internal mirror surface that defines a hole. A ratio of an internal diameter d to an outer diameter D satisfies 0.1?d/D?0.3. The polygonal mirror is adhered to a motor unit that supports and rotates the polygonal mirror, using an adhesive. The internal mirror surface of the polygonal mirror defining the hole is point-bonded to the motor unit using the adhesive, and the point-bonding is conducted in a direction toward a corner of the reflection surfaces.Type: GrantFiled: March 14, 2014Date of Patent: August 30, 2016Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jin-kwon Chun, Jae-hwan Yoo, Won-young Cho, Heon-hee Lim, Ho-hyun Hwang
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Patent number: 9075339Abstract: A polygon mirror assembly, a light scanning unit employing the polygon mirror assembly, and an image forming apparatus. The polygon mirror assembly includes a polygon mirror formed of a plastic material and having a plurality of reflection surfaces; and a motor unit to support and rotate the polygon mirror, where the polygon mirror is coupled to the motor unit by using an adhesive material.Type: GrantFiled: September 5, 2014Date of Patent: July 7, 2015Assignee: SAMSUNG ELECTRONICS CO., LTD.Inventors: Heon-hee Lim, Jae-hwan Yoo, Jin-kwon Chun, Jong-wuk Ku
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Publication number: 20140376966Abstract: A polygon mirror assembly, a light scanning unit employing the polygon mirror assembly, and an image forming apparatus. The polygon mirror assembly includes a polygon mirror formed of a plastic material and having a plurality of reflection surfaces; and a motor unit to support and rotate the polygon mirror, where the polygon mirror is coupled to the motor unit by using an adhesive material.Type: ApplicationFiled: September 5, 2014Publication date: December 25, 2014Applicant: Samsung Electronics Co., Ltd.Inventors: Heon-hee Lim, Jae-hwan Yoo, Jin-kwon Chun, Jong-wuk Ku
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Patent number: 8848014Abstract: A polygon mirror assembly, a light scanning unit employing the polygon mirror assembly, and an image forming apparatus. The polygon mirror assembly includes a polygon mirror formed of a plastic material and having a plurality of reflection surfaces; and a motor unit to support and rotate the polygon mirror, where the polygon mirror is coupled to the motor unit by using an adhesive material.Type: GrantFiled: October 3, 2011Date of Patent: September 30, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Heon-hee Lim, Jae-hwan Yoo, Jin-kwon Chun, Jong-wuk Ku
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Publication number: 20140198171Abstract: A light scanning unit includes a light source to emit a light beam; a polygonal mirror to deflect the light beam in a main scanning direction; and an imaging optical system to image the light beam onto a scanning surface. The polygonal mirror includes a plurality of reflection surfaces that are formed in an outer portion of the polygonal mirror and rotate around a rotational axis and an internal mirror surface that defines a hole. A ratio of an internal diameter d to an outer diameter D satisfies 0.1?d/D?0.3. The polygonal mirror is adhered to a motor unit that supports and rotates the polygonal mirror, using an adhesive. The internal mirror surface of the polygonal mirror defining the hole is point-bonded to the motor unit using the adhesive, and the point-bonding is conducted in a direction toward a corner of the reflection surfaces.Type: ApplicationFiled: March 14, 2014Publication date: July 17, 2014Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jin-kwon CHUN, Jae-hwan YOO, Won-young CHO, Heon-hee LIM, Ho-hyun HWANG
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Patent number: 8711196Abstract: A polygonal mirror, a light scanning unit using the polygonal mirror, and an image forming apparatus. The polygonal mirror is formed of a plastic and includes a plurality of reflection surfaces that are formed in an outer portion of the polygonal mirror and rotate around a rotational axis, and an internal mirror surface that defines a hole, wherein a ratio of an internal diameter d to an outer diameter D satisfies 0.1?d/D?0.3.Type: GrantFiled: November 4, 2011Date of Patent: April 29, 2014Assignee: Samsung Electronics Co., Ltd.Inventors: Jin-kwon Chun, Jae-hwan Yoo, Won-young Cho, Heon-hee Lim, Ho-hyun Hwang
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Publication number: 20120141167Abstract: A polygonal mirror, a light scanning unit using the polygonal mirror, and an image forming apparatus. The polygonal mirror is formed of a plastic and includes a plurality of reflection surfaces that are formed in an outer portion of the polygonal mirror and rotate around a rotational axis, and an internal mirror surface that defines a hole, wherein a ratio of an internal diameter d to an outer diameter D satisfies 0.1?d/D?0.3.Type: ApplicationFiled: November 4, 2011Publication date: June 7, 2012Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Jin-kwon Chun, Jae-hwan Yoo, Won-young Cho, Heon-hee Lim, Ho-hyun Hwang
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Publication number: 20120127252Abstract: A polygon mirror assembly, a light scanning unit employing the polygon mirror assembly, and an image forming apparatus. The polygon mirror assembly includes a polygon mirror formed of a plastic material and having a plurality of reflection surfaces; and a motor unit to support and rotate the polygon mirror, where the polygon mirror is coupled to the motor unit by using an adhesive material.Type: ApplicationFiled: October 3, 2011Publication date: May 24, 2012Applicant: SAMSUNG ELECTRONICS CO., LTD.Inventors: Heon-hee Lim, Jae-hwan Yoo, Jin-kwon Chun, Jong-wuk Ku
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Publication number: 20100315478Abstract: Provided are a semiconductor laser diode, and a printhead and an image forming apparatus including the semiconductor laser diode. The semiconductor laser diode includes a concave-convex pattern, and emits light having a Gaussian light intensity distribution. High quality images are provided by applying the semiconductor laser diode to a printhead and an image forming apparatus.Type: ApplicationFiled: January 27, 2010Publication date: December 16, 2010Applicants: SAMSUNG ELECTRONICS CO., LTD., POSTECH ACADEMY-INDUSTRY-FOUNDATIONInventors: An-sik Choi, O-dae Kwon, Jae-hwan Yoo, Young-chun Kim, Kwang-hyun Chae, Cheng-hoon Kim, Mi-hyang Shin
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Patent number: 7746372Abstract: A beam deflector having a base, the beam deflector including a polygon mirror to reflect a light beam, a mirror driving unit including a rotor shaft erected from the base and a rotor to support the polygon mirror and to rotate about the rotor shaft, a friction member to contact with and be separated from the rotor so as to obstruct and release rotation of the rotor, respectively, and a friction member driving unit to drive the friction member.Type: GrantFiled: June 11, 2008Date of Patent: June 29, 2010Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-hwan Yoo
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Publication number: 20090028603Abstract: A beam deflector having a base, the beam deflector including a polygon mirror to reflect a light beam, a mirror driving unit including a rotor shaft erected from the base and a rotor to support the polygon mirror and to rotate about the rotor shaft, a friction member to contact with and be separated from the rotor so as to obstruct and release rotation of the rotor, respectively, and a friction member driving unit to drive the friction member.Type: ApplicationFiled: June 11, 2008Publication date: January 29, 2009Applicant: Samsung Electronics Co., LtdInventor: Jae-hwan Yoo
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Patent number: 7466332Abstract: A light scanning unit that corrects skew of a scanning line. The light scanning unit, which scans light on an exposed surface of a photosensitive medium, includes a light source to generate and illuminate at least one beam that corresponds to an image signal while being controlled on and off. A beam deflector deflects and scans a beam provided from the light source. A reflection mirror is obliquely arranged so that a scanning line directed to the exposed surface may be inclined with respect to a segment perpendicular to a transferring direction of the exposed surface to direct the scanning line to the exposed surface of the photosensitive medium by reflecting the scanning line provided from the beam deflector.Type: GrantFiled: June 2, 2005Date of Patent: December 16, 2008Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-hwan Yoo
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Patent number: 7450287Abstract: Provided are an optical scanning device and a method for detecting a synchronization signal. In the optical scanning device, a beam incident on a scanning area of an object's surface to be scanned and a beam incident on a synchronization signal detector are emitted by a light source but deflected from different deflecting surfaces of a beam deflector.Type: GrantFiled: April 12, 2005Date of Patent: November 11, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-hwan Yoo, Hyeong-chae Kim
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Patent number: 7348549Abstract: Provided is a light scanning apparatus, including a light source, a light source controller to control an on/off operation of the light source, a light deflector deflecting light emitted from the light source, an image formation optical system to direct light deflected by the light deflector on a scan area of a to-be-scanned surface, a synchronous signal detector to receive the light emitted from the light source and to detect a synchronous signal for light scanning, and a light path changer changing a path of light emitted from the light source and incident upon the light deflector.Type: GrantFiled: March 9, 2007Date of Patent: March 25, 2008Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-Hwan Yoo
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Publication number: 20070242125Abstract: A multi-beam scanning unit is provided in which optical interference does not occur between a plurality of image-forming beams on an image-forming surface, and an image forming apparatus including the multi-beam scanning unit. The multi-beam scanning unit comprises a light unit having a plurality of light-emitting points for irradiating laser beams, and a light unit controller controlling the light-emitting points so that the adjacent light-emitting points do not start light emission simultaneously. A beam deflector deflects laser beams irradiated by each of the light-emitting points on a photosensitive medium.Type: ApplicationFiled: September 15, 2006Publication date: October 18, 2007Inventor: Jae-hwan Yoo
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Patent number: 7253938Abstract: A light scanning apparatus is provided. The light scanning apparatus includes a beam splitter, which is located between a polygonal mirror and an f? lens and reflects a portion of light incident thereon to the polygonal mirror. A laser beam reflected from the beam splitter is reflected by the polygonal mirror and incident on the f? lens. The path of a laser beam incident on the polygonal mirror and the path of the laser beam reflected from the polygonal mirror are at the same level with each other. Therefore, by installing a beam splitter in a laser scanning apparatus, it is possible to reduce the length of each reflective surface of the polygonal mirror in a main scanning direction without increasing the length of each reflective surface of the polygonal mirror in a sub scanning direction. In addition, it is possible to perform high-speed scanning while making less noise.Type: GrantFiled: June 17, 2004Date of Patent: August 7, 2007Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-hwan Yoo
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Publication number: 20070170356Abstract: Provided is a light scanning apparatus, including a light source, a light source controller to control an on/off operation of the light source, a light deflector deflecting light emitted from the light source, an image formation optical system to direct light deflected by the light deflector on a scan area of a to-be-scanned surface, a synchronous signal detector to receive the light emitted from the light source and to detect a synchronous signal for light scanning, and a light path changer changing a path of light emitted from the light source and incident upon the light deflector.Type: ApplicationFiled: March 9, 2007Publication date: July 26, 2007Inventor: Jae-Hwan Yoo
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Patent number: 7247841Abstract: Provided is a light scanning apparatus, including a light source, a light source controller to control an on/off operation of the light source, a light deflector deflecting light emitted from the light source, an image formation optical system to direct light deflected by the light deflector on a scan area of a to-be-scanned surface, a synchronous signal detector to receive the light emitted from the light source and to detect a synchronous signal for light scanning, and a light path changer changing a path of light emitted from the light source and incident upon the light deflector.Type: GrantFiled: June 3, 2005Date of Patent: July 24, 2007Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-Hwan Yoo
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Publication number: 20070115528Abstract: A multi-beam scanning unit includes a light source having a plurality of light emitting portions, each light emitting portion emitting a laser beam, and a beam deflector deflecting each of the laser beams emitted from the light emitting portions in a main scanning direction of a photosensitive medium. The light emitting portions are arranged in a line on a light exit surface of the light source, and an angle A between a section on a light exit surface of the light source corresponding to a sub-scanning direction that is a direction in which the photosensitive medium moves and a section connecting the light emitting portions satisfies the following inequalities: 0°<A?35° or 55°?A?80°.Type: ApplicationFiled: July 27, 2006Publication date: May 24, 2007Applicant: Samsung Electronics Co. Ltd.Inventors: Hyung-soo Kim, Jae-hwan Yoo, Won-ho Seo, In-ho Yoon, Jong-min Lee, Se-tae Kim
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Patent number: 7195163Abstract: A laser scanning unit to form an electrostatic latent image according to an image signal by projecting a light onto a photosensitive medium. The laser scanning unit has a light source having a cylindrical shape of a predetermined length; a reflective member surrounding the light source to focus the light from the light source; a micro-mirror array to reflect the light focused by the reflective member toward the photosensitive medium; a driving control unit to drive the micro-mirror array according to the image signal; and a micro-lens array disposed in an optical path between the micro-mirror array and the photosensitive medium, to focus the light reflected from the micro-mirror array onto the surface of the photosensitive medium.Type: GrantFiled: September 9, 2002Date of Patent: March 27, 2007Assignee: Samsung Electronics Co., Ltd.Inventor: Jae-hwan Yoo