Hybrid microspeaker

Patent metadata

Field	Value
Publication number	US-12470862-B2
Application number	US-202318136403-A
Country	US
Kind code	B2
Filing date	Apr 19, 2023
Priority date	Apr 21, 2022
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A hybrid microspeaker includes a low-frequency range speaker and a high-frequency range speaker. The low-frequency range speaker includes a frame, a low-frequency range magnetic circuit installed inside the frame, a voice coil configured to vibrate by mutual electromagnetic force with the low-frequency range magnetic circuit, and a diaphragm seated on the frame and configured to vibrate with the voice coil to generate sound. The high-frequency range speaker includes a bracket coupled to an upper portion of the frame, a high-frequency range magnetic circuit installed inside the bracket, and a flexible printed circuit board (FPCB) seated on the bracket and including a pattern configured to vibrate by mutual electromagnetic force with the high-frequency range magnetic circuit to generate sound.

First claim

What is claimed is:

1 . A hybrid microspeaker comprising:
a low-frequency range speaker including a frame, a low-frequency range magnetic circuit installed inside the frame, a voice coil configured to vibrate by mutual electromagnetic force with the low-frequency range magnetic circuit, and a diaphragm seated on the frame and configured to vibrate with the voice coil to generate sound; and a high-frequency range speaker including a bracket coupled to an upper portion of the frame, a high-frequency range magnetic circuit installed inside the bracket, and a flexible printed circuit board (FPCB) seated on the bracket and including a pattern configured to vibrate by mutual electromagnetic force with the high-frequency range magnetic circuit to generate sound, wherein the low-frequency range speaker further includes a low-frequency range speaker terminal exposed to the outside of the frame to be connected to the voice coil to supply an electrical signal, wherein the high-frequency range speaker further includes a high-frequency range speaker terminal exposed to the outside of the bracket to be connected to the FPCB to supply an electrical signal, wherein the low-frequency range speaker terminal is configured in the form of a pin terminal, wherein the high-frequency range speaker terminal is configured such that a portion of the FPCB extends to be exposed to the outside of the bracket, wherein a cutout portion of the high-frequency range speaker terminal is connected to the low-frequency range speaker terminal.

2 . The hybrid microspeaker of claim 1 , wherein the low-frequency range magnetic circuit includes:
a yoke coupled to an inner circumferential surface and a lower side of the frame; a magnet disposed inside the yoke with an air gap therebetween; and a top plate disposed above the magnet, wherein a lower end of the voice coil is disposed in the air gap between a side surface of the yoke and the magnet.

3 . The hybrid microspeaker of claim 1 , wherein the high-frequency range magnetic circuit includes a first magnetic circuit forming a magnetic field below the FPCB.

4 . The hybrid microspeaker of claim 3 , wherein the first magnetic circuit includes:
a first inner magnet disposed below the FPCB; a first outer magnet arranged to form an air gap outside the first inner magnet; and a first yoke disposed below the first inner magnet and the first outer magnet.

5 . The hybrid microspeaker of claim 4 , wherein the high-frequency range magnetic circuit further includes a second magnetic circuit forming a magnetic field symmetrical to the first magnetic circuit above the FPCB.

6 . The hybrid microspeaker of claim 5 , wherein the second magnetic circuit includes:
a second inner magnet disposed above the FPCB; a second outer magnet disposed to form an air gap outside the second inner magnet; and a second yoke disposed above the second inner magnet and the second outer magnet and including a sound hole communicating with the air gap.

7 . The hybrid microspeaker of claim 1 , wherein the FPCB further includes a capacitor operating only in a high frequency range.

Assignees

• Em Tech Co Ltd

Inventors

• Yu Byung Min

Classifications

• H04R9/063

  using a plurality of acoustic drivers (H04R1/24 and H04R1/403 take precedence) · CPC title

• H04R9/046

  Construction · CPC title

• H04R9/045

  Mounting (H04R9/043 takes precedence) · CPC title

• H05K1/189

  characterised by the use of flexible or folded printed circuits · CPC title

• H04R9/025

  Magnetic circuit · CPC title