公开(公告)号：US12143793B2

公开(公告)日：2024-11-12

申请号：US17986979

申请日：2022-11-15

Applicant: EM-TECH Co., Ltd.

Inventor： Byung Min Yu ,  Ji Young Lee

IPC: H04R9/02 ,  H04R1/44 ,  H04R7/18

Abstract: Provided are a diaphragm for a high water pressure waterproof microspeaker and a high pressure waterproof microspeaker including the same. The diaphragm for a high pressure waterproof microspeaker, which is provided in a microspeaker to reproduce sound, includes a center diaphragm and a side diaphragm, includes a center diaphragm attachment portion having a ring shape with a perforated center overall and attached to an outer periphery of the center diaphragm, a frame attachment portion attached to a frame, and a dome portion located between the center diaphragm attachment portion and the frame attachment portion and protruding upwardly or downwardly. The center diaphragm attachment portion of the side diaphragm includes an upper attachment portion attached to an upper surface of the center diaphragm and a lower attachment portion attached to a lower surface of the center diaphragm.

公开(公告)号：US12137311B2

公开(公告)日：2024-11-05

申请号：US17715537

申请日：2022-04-07

Applicant: EM-TECH Co., Ltd.

Inventor： Jun Hee Han ,  Yong Ju Ji ,  Young Seok Noh

IPC: H04R1/10 ,  H04R1/28 ,  H04R9/02

Abstract: The present disclosure provides an earphone with a duct unit dividing a pressure equilibrium hole and a back hole. The earphone includes a driver unit including a frame, a magnetic circuit, a voice coil, a diaphragm configured to reproduce sound, and a pressure equilibrium hole configured to improve a pressure difference between front and rear sides of the driver unit, and a back hole configured to smooth vibration of the diaphragm. A housing allows the driver unit to be installed therein and includes a vent hole. A duct unit provided in the housing adjusts a size of a back volume in the housing and provides a flow path from the pressure equilibrium hole to the vent hole.

公开(公告)号：US20240073586A1

公开(公告)日：2024-02-29

申请号：US18240137

申请日：2023-08-30

Applicant: EM-TECH Co., Ltd.

Inventor： Chan Ho Jeong ,  Young Seok Noh ,  Byung Min Yu

IPC: H04R1/24 ,  H04R9/02

CPC classification number: H04R1/24 ,  H04R9/025 ,  H04R2400/11

Abstract: A two-way speaker includes: a frame having a space for accommodating parts; a yoke partitioning the space of the frame vertically and having a lower surface and a side wall; a first speaker unit disposed below the yoke and having a magnet, a top plate, a voice coil, and a diaphragm; a protector disposed below the first speaker unit and protecting the diaphragm; a second speaker unit disposed above the yoke and having a magnetic circuit and a flexible-printed coil membrane (F-PCM) diaphragm having a coil pattern formed on a polymer film; and a sound emission yoke attached to an upper surface of the second speaker unit.

公开(公告)号：US20230389871A1

公开(公告)日：2023-12-07

申请号：US18335297

申请日：2023-06-15

Applicant: IMEDISYNC, INC. ,  EM-Tech. CO., LTD.

Inventor： Seung Wan Kang ,  Tae-gyun Jeong ,  Jong Myung Kim ,  Bo Hyon Sim

IPC: A61B5/00 ,  A61B5/369

CPC classification number: A61B5/6803 ,  A61B5/369

Abstract: The present disclosure relates to an EEG measuring device which is in close contact with a head of a subject while having an adjustable size to fit the head of the subject.

公开(公告)号：US20230156406A1

公开(公告)日：2023-05-18

申请号：US17986979

申请日：2022-11-15

Applicant: EM-TECH Co., Ltd.

Inventor： Byung Min Yu ,  Ji Young Lee

IPC: H04R9/02 ,  H04R7/18 ,  H04R1/44

CPC classification number: H04R9/025 ,  H04R7/18 ,  H04R1/44

Abstract: Provided are a diaphragm for a high water pressure waterproof microspeaker and a high pressure waterproof microspeaker including the same. The diaphragm for a high pressure waterproof microspeaker, which is provided in a microspeaker to reproduce sound, includes a center diaphragm and a side diaphragm, includes a center diaphragm attachment portion having a ring shape with a perforated center overall and attached to an outer periphery of the center diaphragm, a frame attachment portion attached to a frame, and a dome portion located between the center diaphragm attachment portion and the frame attachment portion and protruding upwardly or downwardly. The center diaphragm attachment portion of the side diaphragm includes an upper attachment portion attached to an upper surface of the center diaphragm and a lower attachment portion attached to a lower surface of the center diaphragm.

公开(公告)号：US20230156405A1

公开(公告)日：2023-05-18

申请号：US17986480

申请日：2022-11-14

Applicant: EM-TECH Co., Ltd.

Inventor： Byung Min Yu ,  Jae Hwa Lim ,  Young Uk Jo ,  Yong Hee Oh ,  Yong Dae So

IPC: H04R9/02 ,  H05K1/16 ,  H05K1/02

CPC classification number: H04R9/025 ,  H05K1/16 ,  H05K1/028

Abstract: A microspeaker in which a diaphragm and a voice coil are replaced with a flexible printed circuit board (FPCB) is provided. The microspeaker includes: a magnetic circuit having a yoke and a magnet; and an FPCB diaphragm installed on the magnetic circuit and having a conductive coil pattern formed on a non-conductive film. When an electric signal is applied to the conductive coil pattern of the FPCB diaphragm, the FPCB diaphragm vibrates by mutual electromagnetic force with the magnetic circuit to generate sound.

公开(公告)号：US20230023601A1

公开(公告)日：2023-01-26

申请号：US17869404

申请日：2022-07-20

Applicant: EM-TECH Co., Ltd.

Inventor： Yong Hee Oh ,  Jae Hwa Lim

IPC: H04R1/28

Abstract: The present disclosure provides a microspeaker enclosure including a block formed of a porous material. The microspeaker enclosure including a block formed of a porous material includes a microspeaker, an enclosure case in which the microspeaker is mounted, the enclosure case including a back volume communicating with the microspeaker, a porous block installed in the back volume, having 3-nm pores having air adsorption performance and 6-nm pores serving as a passage for air circulation in a predetermined ratio, and including porous particles combined as a block, and a film attached to one surface of the porous block.

公开(公告)号：US20230022009A1

公开(公告)日：2023-01-26

申请号：US17869338

申请日：2022-07-20

Applicant: EM-TECH Co., Ltd.

Inventor： Yong Hee Oh ,  Jae Hwa Lim

IPC: H04R1/28 ,  H04R1/02

Abstract: The present disclosure provides a microspeaker enclosure including a block formed of a porous material. The microspeaker enclosure includes a microspeaker, an enclosure case in which the microspeaker is mounted, the enclosure case including a back volume communicating with the microspeaker, and a porous block installed in the back volume and prepared by mixing first porous particles having excellent adsorption capacity of nitrogen or oxygen and second porous particles having a porosity of 50% or more.

公开(公告)号：US11564026B2

公开(公告)日：2023-01-24

申请号：US17363922

申请日：2021-06-30

Applicant: EM-TECH Co., Ltd.

Inventor： Yong Ju Ji ,  Jun Hee Han ,  Young Woo Kim

IPC: H04R1/10 ,  H04R9/02

Abstract: Provided is an earphone having a pressure equilibrium structure capable of preventing a decrease in acoustic characteristics or sound pressure, while having a structure capable of achieving equilibrium within an ear canal. The earphone includes a receiver including a frame, a magnetic circuit, a voice coil, and a diaphragm, a front housing surrounding a front and a side surface of the receiver and including a sound tube, a rear housing attached to a rear of the receiver and coupled to the front housing, and a duct located between the diaphragm and the sound tube. An acoustic path through which sound is emitted is formed from the receiver to an end of the sound tube. The front housing or the rear housing includes a leakage hole. An inner end of the duct is connected to the acoustic path. An outer end of the duct is connected to the leakage hole.

公开(公告)号：US20220038810A1

公开(公告)日：2022-02-03

申请号：US17388139

申请日：2021-07-29

Applicant: EM-TECH Co., Ltd.

Inventor： Yong Ju Ji ,  Young Woo Kim

IPC: H04R1/10 ,  H04R7/06 ,  H04R7/18 ,  H04R9/04

Abstract: A receiver having a pressure equilibrium structure includes a magnetic circuit including a yoke, a permanent magnet coupled to the yoke, and a top plate attached to the permanent magnet, a voice coil configured to vibrate by mutual electromagnetic force with the magnetic circuit, a diaphragm allowing the voice coil to be attached thereto and vibrated by the voice coil to generate sound, and a protector coupled to an upper surface of the diaphragm and surrounding an outer side of the magnetic circuit with a gap from an outer periphery of the magnetic circuit, wherein the protector has a hole communicating with a gap portion with the magnetic circuit and an air path is formed by the hole of the protector and the gap between the magnetic circuit and the protector.