Patents by Inventor Yong Ju Ji

Yong Ju Ji 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: 20210136484
    Abstract: Disclosed is a receiver module integrated with a duct. The present disclosure provides a receiver module integrated with a duct in which a back volume and a duct are provided at an outer circumference of a frame of a receiver.
    Type: Application
    Filed: October 29, 2020
    Publication date: May 6, 2021
    Inventors: Yong Ju Ji, Jun Hee Han, Young Seok Noh
  • Patent number: 10899577
    Abstract: An automatic winding device includes a lower casing having a shaft, a bobbin rotatably disposed on the shaft, a wire wound around the bobbin, a spring having a first end secured to the shaft and a second end secured to the bobbin to provide a rotational force to the bobbin, a track cover coupled to the bobbin and having tracks formed thereon, a pin positioned between the bobbin and the track cover to control rotation of the bobbin, and a pin guide spring configured to press the pin toward the track cover. The track cover includes an inner track having a radius of curvature increased and decreased along the circumferential direction, an outer track spaced apart from the inner track, a connection track configured to connect the inner and outer tracks, and a stop track configured to connect the inner and outer tracks and to stop the pin.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: January 26, 2021
    Assignee: EM-TECH. CO., LTD.
    Inventors: Yong Ju Ji, Jung Ho Kang, Jun Hee Han
  • Publication number: 20200223657
    Abstract: An automatic winding device includes a lower casing having a shaft, a bobbin rotatably disposed on the shaft with a wire wound around the bobbin, a spring to provide a rotational force to the bobbin, a track cover coupled to the bobbin to rotate with the bobbin and having a track formed thereon, a pin structure positioned between the bobbin and track cover and having a pin for controlling bobbin rotation, and a pin guide for guiding linear motion of the pin structure. The track cover includes an inner track, an outer track spaced apart from the inner track, a connection track for connecting the inner and outer tracks, and a stop track for connecting the inner and outer tracks. The stop track has a bent portion for stopping the pin. An end of the connection track near the outer track is connected to the outer track and stop track.
    Type: Application
    Filed: August 30, 2019
    Publication date: July 16, 2020
    Inventors: Yong Ju Ji, Jae Baek Jang, Jung Ho Kang, Jun Hee Han
  • Patent number: 10667028
    Abstract: A wearable acoustic transducer includes a communication part for performing communication and speaker and control modules. The speaker module includes an enclosure having an inner space, a first opening in which a speaker part is mounted being formed in a first side surface thereof, a second opening in which a passive vibration part is mounted being formed in a second side surface thereof, the speaker part configured to emit sound, and a passive vibration part for relieving air stiffness in the inner space of the enclosure. The control module performs gain correction on an electric signal including sound or voice that is received from the communication part according to prestored gain correction data and applies the gain-corrected electric signal to the speaker part, or generates an electric signal corresponding to the gain correction data and applies the electric signal to the speaker part.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: May 26, 2020
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Yong Ju Ji, Joong Hak Kwon
  • Patent number: 10536771
    Abstract: A dynamic receiver for an earphone is provided. The dynamic receiver has a Helmholtz resonance space provided on a protector. The dynamic receiver includes: a frame; a magnetic circuit disposed in the frame; a vibration system disposed in the frame and configured to generate sound by a mutual electromagnetic force with the magnetic circuit; and a protector coupled to the frame and configured to protect components disposed in the frame. The protector includes a sound emitting hole passing through the protector and emitting sound generated in the frame to the outside, and a resonance space defined on a top surface of the protector.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: January 14, 2020
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Yong Ju Ji, Jung Ho Kang
  • Publication number: 20190152739
    Abstract: An automatic winding device includes a lower casing having a shaft, a bobbin rotatably disposed on the shaft, a wire wound around the bobbin, a spring having a first end secured to the shaft and a second end secured to the bobbin to provide a rotational force to the bobbin, a track cover coupled to the bobbin and having tracks formed thereon, a pin positioned between the bobbin and the track cover to control rotation of the bobbin, and a pin guide spring configured to press the pin toward the track cover. The track cover includes an inner track having a radius of curvature increased and decreased along the circumferential direction, an outer track spaced apart from the inner track, a connection track configured to connect the inner and outer tracks, and a stop track configured to connect the inner and outer tracks and to stop the pin.
    Type: Application
    Filed: November 20, 2018
    Publication date: May 23, 2019
    Inventors: Yong Ju Ji, Jung Ho Kang, Jun Hee Han
  • Publication number: 20180352323
    Abstract: A dynamic receiver for an earphone is provided. The dynamic receiver has a Helmholtz resonance space provided on a protector. The dynamic receiver includes: a frame; a magnetic circuit disposed in the frame; a vibration system disposed in the frame and configured to generate sound by a mutual electromagnetic force with the magnetic circuit; and a protector coupled to the frame and configured to protect components disposed in the frame. The protector includes a sound emitting hole passing through the protector and emitting sound generated in the frame to the outside, and a resonance space defined on a top surface of the protector.
    Type: Application
    Filed: May 23, 2018
    Publication date: December 6, 2018
    Inventors: Yong Ju Ji, Jung Ho Kang
  • Publication number: 20180242060
    Abstract: A wearable acoustic transducer includes a communication part for performing communication and speaker and control modules. The speaker module includes an enclosure having an inner space, a first opening in which a speaker part is mounted being formed in a first side surface thereof, a second opening in which a passive vibration part is mounted being formed in a second side surface thereof, the speaker part configured to emit sound, and a passive vibration part for relieving air stiffness in the inner space of the enclosure. The control module performs gain correction on an electric signal including sound or voice that is received from the communication part according to prestored gain correction data and applies the gain-corrected electric signal to the speaker part, or generates an electric signal corresponding to the gain correction data and applies the electric signal to the speaker part.
    Type: Application
    Filed: April 24, 2018
    Publication date: August 23, 2018
    Inventors: Yong Ju Ji, Joong Hak Kwon
  • Publication number: 20170171651
    Abstract: An electric device includes a microspeaker module including an enclosure having a rectangular shape and serving as a sound box for generating sound pressure therein, a microspeaker installed on an upper surface of the enclosure for changing an electrical signal into sound pressure to generate vibration of air, and a subordinate vibration unit installed within the enclosure for vibrating, and a control unit for applying the electric signal to the microspeaker module to perform a vibration function and a sound emission function.
    Type: Application
    Filed: December 9, 2015
    Publication date: June 15, 2017
    Inventors: Yong Ju Ji, Joong Hak Kwon
  • Publication number: 20140301587
    Abstract: A slim enclosure speaker is provided with a side acoustic emission structure, which can make the enclosure speaker slimmer by maximizing a sound-emitting hole in the same size, while improving SPL characteristics. The slim enclosure speaker with the side acoustic emission structure includes: a microspeaker; a lower case enclosing the lower side of the microspeaker and defining a resonance space; an upper case having a fixing surface to which top edges of the microspeaker are fixed, defining the resonance space together with the lower case, and having a hole inside the fixing surface; a cover coupled onto the upper case and covering the hole; and an acoustic passage defined by one side of the upper case and the cover, wherein the fixing surface is insert injection-molded using a steel.
    Type: Application
    Filed: March 31, 2014
    Publication date: October 9, 2014
    Inventors: Yong Ju Ji, Sung Chul Jung
  • Publication number: 20140294225
    Abstract: An enclosure speaker with a side acoustic emission structure is provided, which includes: a microspeaker; a lower enclosure case, on which the microspeaker is seated, the lower enclosure case further having a resonance space on the outside of the microspeaker-seated portion; an upper enclosure case coupled to a top of the lower enclosure case; an acoustic passage, a first portion of which being defined in the lower enclosure case and a remaining portion of which being defined in the upper enclosure case, the acoustic passage being made by combining the portion defined in the lower enclosure case and the portion defined in the upper enclosure case; and a mesh disposed on the acoustic passage between the lower enclosure case and the upper enclosure case.
    Type: Application
    Filed: March 27, 2014
    Publication date: October 2, 2014
    Applicant: EM-TECH Co., Ltd.
    Inventors: Yong Ju Ji, Jin Geon Son, Hyun Woo Lee
  • Publication number: 20140233785
    Abstract: The present invention relates to a slim protector with a small thickness and a slim microspeaker having the same. The present invention provides a slim protector, which can reduce the thickness of a slim microspeaker by removing part of an injection product portion and exposing a steel portion to form a ledge for connecting a module case and the slim protector and allow the steel portion and the module case to engage other, and a slim microspeaker module having the same.
    Type: Application
    Filed: February 5, 2014
    Publication date: August 21, 2014
    Applicant: EM-TECH Co., Ltd.
    Inventors: In Ho Jeong, Yong Ju Ji, Ho Yun Lee