Patents by Inventor Chi Un Jo

Chi Un Jo 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).

  • Surface light source apparatus, and method and apparatus for manufacturing the same
    Patent number: 6843587
    Abstract: An apparatus for manufacturing a surface light source apparatus in which a light guide pattern portion is formed on a light guide panel includes a pattern design system to which data about a pattern to be formed on the light guide pattern is input. A control system is connected to the pattern design system and transmits a position signal matching a coordinate value of each pattern to be formed on the light guide panel. A header moving portion mechanically moves vertically and horizontally according to the position signal received from the control system. A laser system outputs a laser beam according to a pulse signal synchronized with a movement of the header moving portion. A lens portion allows a laser beam output from the laser system to pass the header moving portion and to be focused on a scanning surface of the light guide panel. A warp prevention unit prevents the light guide panel from warping due to a local heating by the laser beam.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: January 18, 2005
    Assignee: LS Tech Co., Ltd.
    Inventors: Deuk Il Park, Soon Cheon Cho, Sang Mook Kim, Ok Bin Sur, Choong Yop Rhew, Min Ho Kim, Chi Un Jo, Sung Su Zoo
  • Surface light source apparatus, and method and apparatus for manufacturing the same
    Publication number: 20030210539
    Abstract: An apparatus for manufacturing a surface light source apparatus in which a light guide pattern portion is formed on a light guide panel includes a pattern design system to which data about a pattern to be formed on the light guide pattern is input. A control system is connected to the pattern design system and transmits a position signal matching a coordinate value of each pattern to be formed on the light guide panel. A header moving portion mechanically moves vertically and horizontally according to the position signal received from the control system. A laser system outputs a laser beam according to a pulse signal synchronized with a movement of the header moving portion. A lens portion allows a laser beam output from the laser system to pass the header moving portion and to be focused on a scanning surface of the light guide panel. A warp prevention unit prevents the light guide panel from warping due to a local heating by the laser beam.
    Type: Application
    Filed: April 21, 2003
    Publication date: November 13, 2003
    Applicant: LS TECH CO., LTD.
    Inventors: Duek IL Park, Soon Cheon Cho, Sang Mook Kim, Ok Bin Sur, Choong Yop Rhew, Min Ho Kim, Chi Un Jo, Sung Su Zoo