Patents by Inventor Sang Koo HAN

Sang Koo HAN 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).

  • Image forming apparatus and light emitting device
    Patent number: 10642183
    Abstract: An image forming device comprises: an exposer having a plurality of light emitting devices, a light emitting device among the plurality of light emitting devices to transmit light toward a photosensitive drum; and a developer to develop an electrostatic latent image formed on a surface of the photosensitive drum by the light, wherein the light emitting device among the plurality of light emitting devices includes: a light emitting layer to generate the light; and a reflective layer to reflect at least a portion of the generated light. The reflective layer can include a plurality of sub-reflective layers, in which a thickness of a sub-reflective layer among the plurality of sub-reflective layers is different from a thickness of another sub-reflective layer among the plurality of sub-reflective layers, and/or a refractive index of a sub-reflective layer among the plurality of sub-reflective layers is different from a refractive index of another sub-reflective layer among the plurality of sub-reflective layers.
    Type: Grant
    Filed: May 16, 2018
    Date of Patent: May 5, 2020
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Wan Chin Kim, Wan Ho Lee, Kyoung Man Kim, Su Hwan Kim, Yong Shik Park, Sang Koo Han
  • IMAGE FORMING APPARATUS AND LIGHT EMITTING DEVICE
    Publication number: 20190064693
    Abstract: An image forming device comprises: an exposer having a plurality of light emitting devices, a light emitting device among the plurality of light emitting devices to transmit light toward a photosensitive drum; and a developer to develop an electrostatic latent image formed on a surface of the photosensitive drum by the light, wherein the light emitting device among the plurality of light emitting devices includes: a light emitting layer to generate the light; and a reflective layer to reflect at least a portion of the generated light. The reflective layer can include a plurality of sub-reflective layers, in which a thickness of a sub-reflective layer among the plurality of sub-reflective layers is different from a thickness of another sub-reflective layer among the plurality of sub-reflective layers, and/or a refractive index of a sub-reflective layer among the plurality of sub-reflective layers is different from a refractive index of another sub-reflective layer among the plurality of sub-reflective layers.
    Type: Application
    Filed: May 16, 2018
    Publication date: February 28, 2019
    Applicant: S-PRINTING SOLUTION CO., LTD.
    Inventors: Wan Chin KIM, Wan Ho LEE, Kyoung Man KIM, Su Hwan KIM, Yong Shik PARK, Sang Koo HAN