Patents by Inventor Joo Jin Chang

Joo Jin Chang 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).

  • Publication number: 20240120904
    Abstract: A semiconductor device includes an on-die resistor circuit comprising an on-die resistor, a calibration circuit configured to perform a calibration operation on the on-die resistor, and a calibration control circuit configured to control the calibration operation of the calibration circuit. The calibration circuit includes a current generating circuit configured to supply a calibration current to the on-die resistor and a comparing circuit configured to compare the magnitude of a first input signal that is generated by the calibration current and the on-die resistor with a magnitude of a second input signal that is generated by the calibration current and an external resistor.
    Type: Application
    Filed: February 15, 2023
    Publication date: April 11, 2024
    Applicant: SK hynix Inc.
    Inventors: Dong Seok KIM, Joo Won OH, Keun Jin CHANG
  • Patent number: 11955943
    Abstract: A semiconductor device includes an on-die resistor circuit comprising an on-die resistor, a calibration circuit configured to perform a calibration operation on the on-die resistor, and a calibration control circuit configured to control the calibration operation of the calibration circuit. The calibration circuit includes a current generating circuit configured to supply a calibration current to the on-die resistor and a comparing circuit configured to compare the magnitude of a first input signal that is generated by the calibration current and the on-die resistor with a magnitude of a second input signal that is generated by the calibration current and an external resistor.
    Type: Grant
    Filed: February 15, 2023
    Date of Patent: April 9, 2024
    Assignee: SK hynix Inc.
    Inventors: Dong Seok Kim, Joo Won Oh, Keun Jin Chang
  • Patent number: 11668449
    Abstract: A vehicle lamp includes a light source unit including a plurality of light emitting units for forming different beam patterns, and an optical unit disposed in front of the light source unit for transmitting light generated from the light source unit to form a predetermined beam pattern. The plurality of light emitting units includes a first light emitting unit for forming a first beam pattern and a second light emitting unit disposed around the first light emitting unit for forming a second beam pattern different from the first beam pattern.
    Type: Grant
    Filed: March 10, 2022
    Date of Patent: June 6, 2023
    Assignee: SL Corporation
    Inventors: Dong Hyun Go, Hyo Jin Han, Tae Seok Seo, Joo Jin Chang, Young Ho Son, Jun Woo Woo
  • Patent number: 11644170
    Abstract: Provided is a lamp for a vehicle. The vehicle lamp comprises a light source unit for generating light, and a lens unit for forming a predetermined beam pattern by allowing the light incident through a plurality of incident lenses from the light source unit to be emitted through a plurality of emitting lenses corresponding to each of the plurality of incident lenses. The plurality of incident lenses comprises a first incident lens for allowing the light incident from the light source unit to be emitted in a first direction, and a second incident lens for allowing a first portion of the light incident from the light source unit to be emitted in the first direction, and a second portion of the light to be emitted in a second direction different from the first direction.
    Type: Grant
    Filed: December 29, 2021
    Date of Patent: May 9, 2023
    Assignee: SL Corporation
    Inventors: Dong Hyun Go, Hyo Jin Han, Joo Jin Chang
  • Publication number: 20220373154
    Abstract: A vehicle lamp includes a light source unit including a plurality of light emitting units for forming different beam patterns, and an optical unit disposed in front of the light source unit for transmitting light generated from the light source unit to form a predetermined beam pattern. The plurality of light emitting units includes a first light emitting unit for forming a first beam pattern and a second light emitting unit disposed around the first light emitting unit for forming a second beam pattern different from the first beam pattern.
    Type: Application
    Filed: March 10, 2022
    Publication date: November 24, 2022
    Inventors: Dong Hyun GO, Hyo Jin HAN, Tae Seok SEO, Joo Jin CHANG, Young Ho SON, Jun Woo WOO
  • Patent number: 11415288
    Abstract: Provided is a lamp for a vehicle capable of forming a plurality of different beam patterns. The vehicle lamp includes a light source system, a lens system, and a shield system. The lens system includes a plurality of incident lenses onto which light emitted from the light source system is incident and a plurality of exit lenses to output the light incident thereto from the plurality of incident lenses to form a predetermined beam pattern. The shield system includes a plurality of main shields to block some of light beams from being directed to the plurality of exit lenses, wherein each of the plurality of shields includes a blocking surface to block a light beam from being directed to the plurality of exit lenses and at least one transmission hole formed in the blocking surface.
    Type: Grant
    Filed: June 21, 2021
    Date of Patent: August 16, 2022
    Assignee: SL Corporation
    Inventors: Dong Hyun Go, Hyo Jin Han, Joo Jin Chang
  • Publication number: 20220205608
    Abstract: Provided is a lamp for a vehicle. The vehicle lamp comprises a light source unit for generating light, and a lens unit for forming a predetermined beam pattern by allowing the light incident through a plurality of incident lenses from the light source unit to be emitted through a plurality of emitting lenses corresponding to each of the plurality of incident lenses. The plurality of incident lenses comprises a first incident lens for allowing the light incident from the light source unit to be emitted in a first direction, and a second incident lens for allowing a first portion of the light incident from the light source unit to be emitted in the first direction, and a second portion of the light to be emitted in a second direction different from the first direction.
    Type: Application
    Filed: December 29, 2021
    Publication date: June 30, 2022
    Inventors: Dong Hyun GO, Hyo Jin HAN, Joo Jin CHANG
  • Publication number: 20220026038
    Abstract: Provided is a lamp for a vehicle capable of forming a plurality of different beam patterns. The vehicle lamp includes a light source system, a lens system, and a shield system. The lens system includes a plurality of incident lenses onto which light emitted from the light source system is incident and a plurality of exit lenses to output the light incident thereto from the plurality of incident lenses to form a predetermined beam pattern. The shield system includes a plurality of main shields to block some of light beams from being directed to the plurality of exit lenses, wherein each of the plurality of shields includes a blocking surface to block a light beam from being directed to the plurality of exit lenses and at least one transmission hole formed in the blocking surface.
    Type: Application
    Filed: June 21, 2021
    Publication date: January 27, 2022
    Inventors: Dong Hyun GO, Hyo Jin HAN, Joo Jin CHANG
  • Patent number: 10746370
    Abstract: A lamp for a vehicle capable of forming a beam pattern having a cutoff line to prevent glare to a driver of a vehicle in front is provided. The lamp for a vehicle includes a light source portion, a first lens portion including a plurality of incident lenses disposed on a surface on which light is incident from the light source portion, a second lens portion including a plurality of exit lenses disposed on a surface from which light incident from the first lens portion is emitted, and a shield portion disposed between the plurality of incident lens and the plurality of exit lenses. At least one of the plurality of incident lenses and at least one of the plurality of exit lenses, which are disposed in a horizontal direction to form horizontal rows, are arranged to allow the horizontal rows to be inclined at a predetermined angle.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: August 18, 2020
    Assignee: SL CORPORATION
    Inventors: Hyo Jin Han, Joo Jin Chang
  • Publication number: 20200141553
    Abstract: A lamp for a vehicle capable of forming a beam pattern having a cutoff line to prevent glare to a driver of a vehicle in front is provided. The lamp for a vehicle includes a light source portion, a first lens portion including a plurality of incident lenses disposed on a surface on which light is incident from the light source portion, a second lens portion including a plurality of exit lenses disposed on a surface from which light incident from the first lens portion is emitted, and a shield portion disposed between the plurality of incident lens and the plurality of exit lenses. At least one of the plurality of incident lenses and at least one of the plurality of exit lenses, which are disposed in a horizontal direction to form horizontal rows, are arranged to allow the horizontal rows to be inclined at a predetermined angle.
    Type: Application
    Filed: August 21, 2019
    Publication date: May 7, 2020
    Inventors: Hyo Jin Han, Joo Jin Chang