Patents Assigned to Em-Tech. Co., Ltd.
  • Patent number: 10902984
    Abstract: A linear actuator having an elastic injection-molded frame includes a yoke, a permanent magnet attached to a bottom surface of the yoke at a distance from a side surface of the yoke, a top plate attached to a top surface of the permanent magnet, a frame coupled to an outer periphery of the yoke and injection-molded with an elastic material, a protector disposed on the frame, and a coil secured to the protector, with a lower end positioned between the permanent magnet and the side surface of the yoke. The frame includes a yoke coupling portion coupled to the yoke, a fixing portion spaced apart from the yoke coupling portion and coupled to the protector, and two or more bridges for elastically connecting the yoke coupling portion and the fixing portion.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: January 26, 2021
    Assignee: EM-TECH. CO., LTD.
    Inventors: Ki Hyun Nam, Jae Baek Jang, Young Uk Jo
  • 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
  • Patent number: 10863266
    Abstract: The present disclosure provides a reliable structure which can prevent disconnection of a voice coil lead wire, while employing a voice coil embodied as an aluminum coil to improve the mid-frequency band SPL of a slim high-pressure water resistant microspeaker. According to the present disclosure, there is provided a high-pressure water resistant microspeaker with an improved coil structure, including an FPCB attached to the outer surface of a frame, a pad of the FPCB extending inside the frame and another part of the FPCB extending outside the frame. The upper end of the voice coil is attached to an overlapping position of a side diaphragm and a center diaphragm, and the lower end of the voice coil is supported by the part of the FPCB extending inside the frame.
    Type: Grant
    Filed: February 5, 2018
    Date of Patent: December 8, 2020
    Assignee: EM-TECH. CO., LTD.
    Inventors: Ji Hoon Kim, Gang Tae Kim, Jeong Seong Park
  • Patent number: 10728672
    Abstract: A sound converter includes a rectangular frame, a first suspension seated on an upper side of the frame to vibrate, a second suspension attached to a bottom surface of the first suspension and electrically connected to a voice coil to vibrate, a magnetic circuit including a center magnet, a plurality of sub-magnets spaced apart from the center magnet by a certain distance to define a magnetic gap, a plurality of top plates positioned above the center magnet and each sub-magnet, and a bottom plate positioned below the center magnet and each sub-magnet, and a third suspension connecting a lower end or a lower end lateral surface of the voice coil to the frame to vibrate. The voice coil is attached to a bottom surface of the second suspension. The third suspension is positioned through spaces defined by the sub-magnets being spaced apart from each other.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: July 28, 2020
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Cheon Myeong Kim, Sung Chul Jung, Seul Ki Nam, Gyung Bo Ha
  • 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
  • Patent number: 10516945
    Abstract: The present invention relates to a high power microspeaker having a separate sub-diaphragm on a top end surface of a coil, in addition to a diaphragm and a suspension. The present invention provides a structure in which an acoustic system including a main diaphragm and a conductive suspension of a microspeaker is attached to a top end surface of a coil and a separate sub-diaphragm is attached to the same surface of the coil.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: December 24, 2019
    Assignee: EM-TECH Co., Ltd.
    Inventors: Cheon Myeong Kim, Ji Hoon Kim, Sung Chul Jung, Seul Ki Nam
  • Patent number: 10484789
    Abstract: The present invention relates to a micro-speaker for use in a small electronic device, and more particularly, to a micro-speaker having an enclosure applied thereto and having an air adsorbent which can improve the low frequency sound quality. According to the present invention, it is possible to provide a micro-speaker which shows excellent improvement in the low frequency characteristics, regardless of a mass ratio of silicon to aluminum of an air adsorbent, and also possible to provide a micro-speaker which shows excellent improvement in the low frequency characteristics at a low cost, by reducing a mass ratio of silicon to aluminum, as compared with the conventional micro-speaker having an air adsorbent.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: November 19, 2019
    Assignee: EM-TECH. CO., Ltd.
    Inventor: Ghi Yuun Kang
  • Patent number: 10419848
    Abstract: The present invention discloses a microspeaker enclosure with porous materials, including a microspeaker, an enclosure with the microspeaker therein, the enclosure defining a resonance space and having an upper casing and a lower casing, a sound absorber arranged in the resonance space and defining a space, and porous materials filled in the space defined by the sound absorber.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: September 17, 2019
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Kyu Dong Choi, Seul Ki Nam, Heung Woo Jeong
  • Patent number: 10419847
    Abstract: The present invention discloses a microspeaker enclosure with porous materials, including a microspeaker, an enclosure with the microspeaker therein, the enclosure defining a resonance space and having an upper casing and a lower casing, porous materials filled in the resonance space of the enclosure, and an anti-noise structure which prevents at least one of a collision between the porous materials, a collision between the porous materials and the enclosure, a collision between the porous materials and the microspeaker, and introduction of the porous materials into the microspeaker.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: September 17, 2019
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Kyu Dong Choi, Jong Heon Ha, Hyeon Taek Oh
  • Patent number: 10334342
    Abstract: The present invention relates to a neckband-type wireless sound transducer, and more particularly, to a neckband-type wireless sound transducer that prevents sound from being transferred to the surroundings of the wearer. The neckband-type wireless sound transducer according to the present invention, includes: a main body part configured to be seated on a human body; a main speaker part mounted on the main body part and configured to emit sound to the inside of the main body part; an auxiliary speaker part mounted on the main body part and configured to emit sound for leakage reduction to offset the sound emitted by the main speaker part and leaked to the outside of the main body part; and a controller configured to apply an electric signal for sound emission to the main speaker part and an electric signal for leakage reduction to the auxiliary speaker part.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: June 25, 2019
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Choong Sheek Hong, Joong Hak Kwon
  • Patent number: 10298105
    Abstract: A linear vibrator includes a bracket having a plate shape, a casing having a hexahedral shape with an open bottom and coupled to the bracket, a circuit board on the bracket, a coil on the circuit board, a pair of magnets spaced apart from each other and disposed over the coil at an interval from the coil, a plate having a pair of magnet attachment surfaces attached to top surfaces of the pair of magnets and a connection surface downwardly bent with a step difference from the magnet attachment surfaces and connecting the pair of magnet attachment surfaces, a weight on top of the plate, and a spring on top of the connection surface and formed in a strip shape with two ends secured to the casing and a center portion secured to the connection surface. The spring is bilateral symmetric and has at least a pair of inwardly-bent portions.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: May 21, 2019
    Assignee: EM-TECH, Co., Ltd.
    Inventors: Jong Dae Kim, Keun Yong Hwang
  • Patent number: 10251000
    Abstract: A hearing assistance device for informing about the state of a wearer includes: an input part configured to receive a selection input for either an ambient listening function or a music listening function; at least one microphone configured to pick up ambient sound; a speaker configured to send the ambient sound to the wearer; a communication part configured to perform wired or wireless communication with an external electronic communication device; an indication part configured to indicate that the ambient listening function or the music listening function is being performed; and a controller configured to perform the ambient listening function to pick up ambient sound from the microphone according to a selection input from the input part and send the ambient sound to the speaker, or perform the music listening function to play stored music or music received from the communication part and send the music to the speaker.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: April 2, 2019
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Choong Sheek Hong, Dong Sung Kim, Yong Jun Kwon, Taek Jin Han
  • Patent number: 10057678
    Abstract: The present invention aims to provide a microspeaker with enhanced low frequency characteristics, by arranging an adsorbent for adsorbing the air in a resonance space and defining a virtual back volume by the air adsorption of the adsorbent. According to an aspect of the present invention, there is provided a microspeaker enclosure with an air adsorbent, including a microspeaker, an enclosure with the microspeaker provided therein, the enclosure defining a resonance space, and an air adsorbent applied to the resonance space of the enclosure, wherein an air adsorption mole ratio per unit volume of the air adsorbent based on a change in the unit pressure is 40.6 mol/m3·atm.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: August 21, 2018
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Joong Hak Kwon, Ghi Yuun Kang, Hwan Ock Choe
  • Patent number: 9900703
    Abstract: The present invention relates to a suspension structure for a high power micro speaker and, more particularly, to a shape of a suspension which ensures a lightweight of the suspension as well as high reliability and a conductive pattern which applies electric signals. The present invention provides a suspension for a high power micro speaker that includes an outer peripheral portion, a central portion and a connection portion, is provided with a conductive pattern, and is formed in a rectangular shape, wherein land portions for use in soldering or welding lead-in wires of a voice coil are formed on long connection portions disposed on long sides.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: February 20, 2018
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Cheon Myeong Kim, Kyu Dong Choi, In Ho Jeong
  • Patent number: 9832557
    Abstract: A microspeaker includes a frame, magnetic circuit, voice coil configured to generate vibration by mutual electromagnetic force with the magnetic circuit, vibration plate configured to vibrate together according to the vibration of the voice coil to generate a sound, and suspension configured to guide a vibration direction of the vibration plate and voice coil. The suspension has a central portion attached to the voice coil, an annular outer circumferential portion formed to be spaced apart from the central portion by a predetermined interval, and a connection portion connecting the central and outer circumferential portions and configured to perform a damping function. The central portion has an outer end having the same height as the connection and outer circumferential portions, an inner end positioned to be higher than the outer end, and a step portion connecting the outer end and inner end. The voice coil is attached to the inner end.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: November 28, 2017
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Kil Dong Park, Seul Ki Nam, Ji Hoon Kim, Min Chang Kim
  • Patent number: 9693145
    Abstract: The present invention relates to a suspension structure for a high power micro speaker and, more particularly, to a shape of a suspension which ensures a lightweight of the suspension as well as high reliability and a conductive pattern which applies electric signals. The present invention provides a suspension for a high power micro speaker that includes an outer peripheral portion, a central portion and a connection portion, is provided with a conductive pattern, and is formed in a rectangular shape, wherein land portions for use in soldering or welding lead-in wires of a voice coil are formed on long connection portions disposed on long sides.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: June 27, 2017
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Cheon Myeong Kim, Kyu Dong Choi, In Ho Jeong
  • Patent number: 9473837
    Abstract: The present invention discloses a sound transducer with a ventilation structure capable of securing a flow path of air introduced from within and outside of the sound transducer to the maximum. The sound transducer with a ventilation structure includes a frame, a magnetic circuit installed within the frame, a voice coil vibrating according to mutual electromagnetic force with the magnetic circuit upon receiving an electrical signal, a vibration plate vibrating according to vibrations of the voice coil to generate a sound, and a drain hole formed to be adjacent to the corner of the frame and allowing air to flow between the interior and exterior of the frame.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: October 18, 2016
    Assignee: Em-Tech. Co., Ltd.
    Inventors: Kyu Dong Choi, Kil Dong Park, Ji Hoon Kim, Joong Hak Kwon
  • Patent number: 9277305
    Abstract: An object of the present invention is to provide a suspension for a sound transducer which has a central portion serving as a center diaphragm and which has a cover layer and a copper pattern partially removed to prevent a decrease in sound pressure from being caused by an increase in weight of a vibration system. According to the present invention, there is provided a suspension for a sound transducer which includes a central portion, a peripheral portion, and a support portion for connecting the central portion to the peripheral portion, the suspension comprising: a base film, a conductive film attached on the base film by means of an adhesive, and a cover layer attached on the conductive film by an adhesive, wherein at least part of the cover layer disposed on the central portion is removed.
    Type: Grant
    Filed: July 29, 2013
    Date of Patent: March 1, 2016
    Assignee: EM-TECH. Co., Ltd.
    Inventors: Joong Hak Kwon, Ho Il Jeong, Kyu Dong Choi, In Ho Jeong
  • Patent number: 9185477
    Abstract: The present invention relates to a suspension for a sound transducer. The present invention discloses a suspension for a sound transducer, to which a diaphragm and voice coil of the sound transducer are attached and which guides the vibrations of the diaphragm and voice coil, comprising: a central portion to which a voice coil is attached; an outer peripheral portion resting on a frame; and a connecting portion connecting the central portion and the outer peripheral portion, wherein the central portion has a mold portion, which is molded by heat or pressure to take the place of a center diaphragm.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: November 10, 2015
    Assignee: EM-TECH Co., Ltd.
    Inventors: Ji Hoon Kim, Joong Hak Kwon, Jung Hyung Lee, Hyeon Taek Oh