Patents by Inventor Chang Hwan Lee

Chang Hwan Lee 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).

  • Patent number: 7957086
    Abstract: A method of controlling a flying height of a magnetic head of a hard disk drive apparatus includes producing a reference FOD (flying on demand) voltage profile defining a relationship between the flying height of the magnetic head and an FOD voltage at a measured temperature, wherein an end of the magnetic head thermally expands and protrudes when the FOD voltage is applied to a heater included in the magnetic head and setting the reference FOD voltage profile that is corrected using a reference maximum flying height of the magnetic head that is preset at room temperature, as an applied FOD voltage profile to control the flying height of the magnetic head.
    Type: Grant
    Filed: February 15, 2008
    Date of Patent: June 7, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chang-Hwan Lee, Hae Jung Lee
  • Publication number: 20110030463
    Abstract: A steering angle sensing apparatus and method are provided. The apparatus and method sense the steering angle of a steering shaft by using a rotated bit value difference corresponding to the rotated angles of magnets, which are respectively coupled on an axis of one of a plurality of sub gears, when the sub gears with respectively different gear ratios rotate with a shaft gear that rotates together with the steering shaft.
    Type: Application
    Filed: October 21, 2010
    Publication date: February 10, 2011
    Applicant: LG Innotek Co., Ltd.
    Inventors: Kyong Ho Kang, Choon Wook Park, Sung Kyu Bae, Chang Hwan Lee
  • Publication number: 20100325335
    Abstract: A dual modem device includes a first processor to communicate with a first network and a second processor to communicate with a second network. The first processor includes a USB module to transceive a signal with a computer side using a universal serial bus (USB) interface, a first packet control block to determine a type of the signal transceived via the USB module and to decide a communication path, and a first function block to process a signal associated with the first network. The second processor includes a first control block to process a control signal for the first processor, a second control block to process a control signal for the second processor, and a second function block to process a signal associated with the second network.
    Type: Application
    Filed: May 26, 2010
    Publication date: December 23, 2010
    Inventors: Young KIM, Chang Hwan Lee, Young Hwan Lee, Chang Jae Lee
  • Publication number: 20100319466
    Abstract: Disclosed are a stator assembly and a torque assembly device. The stator assembly includes a stator holder, a first stator which includes a first body making contact with an upper end of the stator holder and a plurality of first teeth extending from the first body so as to be disposed inside the stator holder, a second stator which includes a second body making contact with a lower end of the stator holder and a plurality of second teeth extending from the second body so to be alternately aligned with the first teeth inside the stator holder, and a fusion-welded material that is fusion-welded to the stator holder and the first and second bodies.
    Type: Application
    Filed: September 10, 2008
    Publication date: December 23, 2010
    Inventors: Sung Kyu Bae, Chang Hwan Lee
  • Patent number: 7841231
    Abstract: A steering angle sensing apparatus and method are provided. The apparatus and method sense the steering angle of a steering shaft by using a rotated bit value difference corresponding to the rotated angles of magnets, which are respectively coupled on an axis of one of a plurality of sub gears, when the sub gears with respectively different gear ratios rotate with a shaft gear that rotates together with the steering shaft.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: November 30, 2010
    Assignee: LG Innotek Co., Ltd.
    Inventors: Kyong Ho Kang, Choon Wook Park, Sung Kyu Bae, Chang Hwan Lee
  • Publication number: 20100296191
    Abstract: A hard disk drive effectively removes internal humidity therefrom and thus improves the reliance and performance of the hard disk drive in high and increased humidity environments.
    Type: Application
    Filed: May 20, 2010
    Publication date: November 25, 2010
    Applicant: Samsung Electronics Co., Ltd
    Inventors: Tae Young KIM, Chang-Hwan Lee
  • Publication number: 20100141679
    Abstract: A system for composing pictorial/video image contents where the Face Image which the User designates (FIU) is reflected is disclosed. The system provides a series of pictorial/video image composing pipe line for changing the face of a specific source character that appears in pictorial/video image contents to a FIU pattern and guides a video related company (for example, a producer, a distributor, a sales agency (provider), etc.) to establish a base infra for producing/manufacturing/marketing a video on demand (VOD) content that reflects individual desire of a user so that it can satisfy user needs in changing the face image of a specific character appearing in pictorial/video image contents into the face image of a favorite person (or the user designates, for example, his/her own face image, the face image of his/her acquaintance, the face image of a specific celebrity, the face image of a specific politician, and so on).
    Type: Application
    Filed: July 19, 2007
    Publication date: June 10, 2010
    Inventor: Chang Hwan Lee
  • Patent number: 7616015
    Abstract: Example embodiments may provide a wafer type probe card, a method of fabricating a wafer type probe card, and/or a semiconductor test apparatus having the wafer type probe card. The wafer type probe card may include a semiconductor and a plurality of probing chips. The semiconductor substrate may include a plurality of probing area each including a first surface and/or a second surface opposite to the first surface. Each of the plurality of probing chips may include a plurality of conductive first pads arranged in the first surface of each of the plurality of probing areas and/or a plurality of conductive second pads arranged in the second surface of each the plurality of probing chips to be respectively connected to the first pads.
    Type: Grant
    Filed: August 23, 2007
    Date of Patent: November 10, 2009
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chang-hwan Lee
  • Patent number: 7561129
    Abstract: An organic light-emitting device and an organic light-emitting display having the same are provided. The organic light-emitting device comprises: an organic light-emitting diode emitting light using an output current; a storage capacitor for receiving a data voltage from a data line, and storing the received data voltage; a driving thin film transistor connected between a source voltage and the organic light-emitting diode and having a gate connected to one terminal of the storage capacitor; a first switching unit connected between the one terminal of the storage capacitor and the data line and having a gate connected with a first scan line; a second switching unit connected between the other terminal of the storage capacitor and an initialization voltage line and having a gate connected with the first scan line; and a third switching unit connected between the other terminal of the storage capacitor and the data line and having a gate connected with a second scan line.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: July 14, 2009
    Assignee: LG. Display Co., Ltd.
    Inventors: Chang Hwan Lee, Jin Huh
  • Patent number: 7560061
    Abstract: A high strength polyamide fiber consisting of polyamide monofilaments each having a fineness of less than 4 denier and a stress-strain curve where (a) the monofilament elongates less than 5% when subjected to an initial stress of 1.0 g/d, (b) it elongates less than 12% when subjected to a middle stress of 4.5 g/d, and (c) it elongates more than 3% over a tensile strength range from a tensile strength of at least 9.0 d/g to the tensile strength at break of the monofilament, the elongation values being measured at ambient temperature.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: July 14, 2009
    Assignee: HYOSUNG Corporation
    Inventors: Je-An Yu, Chang-Hwan Lee
  • Patent number: 7506391
    Abstract: The present invention relates to a low shrinkage polyamide fiber suitable for use as a yam of a fabric for airbags and an uncoated fabric for airbags produced using the same. The fabric produced using the low shrinkage polyamide fiber of the present invention has high tensile strength and tear strength, and excellent quality, and thus, is useful as a fabric for airbags.
    Type: Grant
    Filed: December 1, 2005
    Date of Patent: March 24, 2009
    Assignee: Hyosung Corporation
    Inventors: Je-An Yu, Chang-Hwan Lee
  • Patent number: 7486027
    Abstract: An organic light emitting diode display device comprising a display panel, a plurality of light emitting diodes arranged on the display panel and having an optical amount varied according to a current amount, a sample/hold unit for supplying a current to the light emitting diodes, a D/A converter for controlling a current amount supplied to the light emitting diodes from the sample/hold unit by controlling a current amount supplied from the sample/hold unit according to image information, and a voltage controller for conducting or shielding a current between the D/A converter and the sample/hold unit by outputting a second bias voltage of which loss voltage has been compensated according to a characteristic of a transistor provided at the D/A converter to the D/A converter by receiving a first bias voltage.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: February 3, 2009
    Assignee: LG Display Co., Ltd.
    Inventors: Chang Hwan Lee, Hoon Ju Chung
  • Publication number: 20080307873
    Abstract: A steering angle sensing apparatus and method are provided. The apparatus and method sense the steering angle of a steering shaft by using a rotated bit value difference corresponding to the rotated angles of magnets, which are respectively coupled on an axis of one of a plurality of sub gears, when the sub gears with respectively different gear ratios rotate with a shaft gear that rotates together with the steering shaft.
    Type: Application
    Filed: July 13, 2007
    Publication date: December 18, 2008
    Inventors: Kyong Ho Kang, Choon Wook Park, Sung Kyu Bae, Chang Hwan Lee
  • Publication number: 20080266704
    Abstract: A method of controlling a flying height of a magnetic head of a hard disk drive includes calculating a corrected flying on demand (FOD) voltage to correct a difference between a measured flying height measured by applying a burn-in FOD voltage corresponding to a target flying height and a burn-in flying height in a reference FOD voltage profile corresponding to the burn-in FOD voltage, using the reference FOD voltage profile, in the reference FOD voltage profile that is a profile of a second signal for calculating the flying height of the magnetic head with respect to a first signal for calculating an FOD voltage that allows an end of the magnetic head to thermally expand and protrude when applied to a heater included in the magnetic head, and applying an applied FOD voltage obtained by applying the corrected FOD voltage, to the burn-in FOD voltage, to control the flying height of the magnetic head.
    Type: Application
    Filed: April 24, 2008
    Publication date: October 30, 2008
    Applicant: Samsung Electronics Co., Ltd
    Inventors: Young Shin Kim, Hae Jung Lee, Chang-Hwan Lee
  • Publication number: 20080198497
    Abstract: A method of controlling a flying height of a magnetic head of a hard disk drive apparatus includes producing a reference FOD (flying on demand) voltage profile defining a relationship between the flying height of the magnetic head and an FOD voltage at a measured temperature, wherein an end of the magnetic head thermally expands and protrudes when the FOD voltage is applied to a heater included in the magnetic head and setting the reference FOD voltage profile that is corrected using a reference maximum flying height of the magnetic head that is preset at room temperature, as an applied FOD voltage profile to control the flying height of the magnetic head.
    Type: Application
    Filed: February 15, 2008
    Publication date: August 21, 2008
    Applicant: Samsung Electronics Co., Ltd
    Inventors: Chang-Hwan Lee, Hae Jung Lee
  • Publication number: 20080187782
    Abstract: A perpendicular magnetic recording medium includes a substrate forming a base, a magnetic layer deposited on a surface of the substrate in a direction along a thickness of the substrate, and an overcoat deposited on the magnetic layer in the direction along the thickness of the substrate to protect the magnetic layer, and having a texture formed partially indented from a surface and textured to have a predetermined surface roughness. The hard disk drive apparatus includes a magnetic head and the perpendicular magnetic recording medium where data is recorded and stored using the magnetic head.
    Type: Application
    Filed: January 31, 2008
    Publication date: August 7, 2008
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Chang-Hwan LEE, Sang Hyub LEE
  • Patent number: 7372140
    Abstract: In an embodiment, a memory module includes a first group of multi chip packages, including one or more non-volatile memories, and a second group of multi chip packages, including one or more volatile memories, wherein the first and second groups of multi chip packages are electrically connected to a substrate. Various types of memory packages can be integrated into a single module that is mounted to the substrate, such as a printed circuit board, for improved size efficiency.
    Type: Grant
    Filed: December 12, 2005
    Date of Patent: May 13, 2008
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Chang-Hwan Lee
  • Publication number: 20080064282
    Abstract: A high strength polyamide fiber consisting of polyamide monofilaments each having a fineness of less than 4 denier and a stress-strain curve where (a) the monofilament elongates less than 5% when subjected to an initial stress of 1.0 g/d, (b) it elongates less than 12% when subjected to a middle stress of 4.5 g/d, and (c) it elongates more than 3% over a tensile strength range from a tensile strength of at least 9.0 d/g to the tensile strength at break of the monofilament, the elongation values being measured at ambient temperature.
    Type: Application
    Filed: November 9, 2007
    Publication date: March 13, 2008
    Applicant: HYOSUNG CORPORATION
    Inventors: Je-An Yu, Chang-Hwan Lee
  • Publication number: 20080048689
    Abstract: Example embodiments may provide a wafer type probe card, a method of fabricating a wafer type probe card, and/or a semiconductor test apparatus having the wafer type probe card. The wafer type probe card may include a semiconductor and a plurality of probing chips. The semiconductor substrate may include a plurality of probing area each including a first surface and/or a second surface opposite to the first surface. Each of the plurality of probing chips may include a plurality of conductive first pads arranged in the first surface of each of the plurality of probing areas and/or a plurality of conductive second pads arranged in the second surface of each the plurality of probing chips to be respectively connected to the first pads.
    Type: Application
    Filed: August 23, 2007
    Publication date: February 28, 2008
    Inventor: Chang-hwan Lee
  • Patent number: 7194198
    Abstract: The present invention provides a far infrared heat emitting article for a sauna. The article includes a heating element, for emitting far infrared heat in the far infrared wavelength range. It also includes a supporting-encapsulating element, for supporting the heating element thereon and for encapsulating the heating element therein, able to distribute the far infrared heat substantially evenly thereover. The article further includes a heat-dispersing coating, extending over and coating the supporting-encapsulating element, able to substantially evenly disperse the emitted far infrared heat therefrom.
    Type: Grant
    Filed: December 9, 2004
    Date of Patent: March 20, 2007
    Assignee: American Infrared Sauna Corp.
    Inventor: Chang Hwan Lee