Coaxial speaker

Patent metadata

Field	Value
Publication number	US-12156007-B2
Application number	US-202217914362-A
Country	US
Kind code	B2
Filing date	Jul 20, 2022
Priority date	Jun 30, 2022
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

A coaxial speaker includes a frame, a vibration system, and a magnetic circuit system. The vibration system includes a vibrating diaphragm and a voice coil. The magnetic circuit system includes a transmission cavity, an inner magnetic gap, and an outer magnetic gap. The transmission cavity penetrates through the magnetic circuit system. The vibrating diaphragm includes a first vibrating diaphragm, a second vibrating diaphragm, and a third vibrating diaphragm. The first vibrating diaphragm and the third vibrating diaphragm seal the transmission cavity. The coaxial speaker not only increases a range of frequency bands, improves conversion efficiency of high pitch sound, shortens a length of a front cavity from a vibration system to a sound outlet so as to reduce energy loss caused by front cavity resonance, but also ensures waterproofness of tweeter units, and achieves a private call function in an assembly application process for a complete machine.

First claim

What is claimed is:

1. A coaxial speaker, comprising:
a frame;
a vibration system; and
a magnetic circuit system;
wherein the vibration system and the magnetic circuit system are fixed to the frame; the vibration system comprises a vibrating diaphragm and a voice coil, the magnetic circuit system comprises a transmission cavity, an inner magnetic gap, and an outer magnetic gap, the inner magnetic gap is defined around the transmission cavity, the outer magnetic gap is defined around the inner magnetic gap, the transmission cavity penetrates through the magnetic circuit system; the vibrating diaphragm comprises a first vibrating diaphragm, a second vibrating diaphragm, and a third vibrating diaphragm; the second vibrating diaphragm is disposed around the first vibrating diaphragm, an outer periphery of the first vibrating diaphragm and an inner periphery of the second vibrating diaphragm are both fixed to the magnetic circuit system, an outer periphery of the second vibrating diaphragm is fixed to the frame, an outer periphery of the third vibrating diaphragm is fixed to one side, facing away from the first vibrating diaphragm, of the magnetic circuit system; the first vibrating diaphragm and the third vibrating diaphragm seal the transmission cavity; the voice coil comprises a first voice coil and a second voice coil, the first voice coil is inserted into the inner magnetic gap and drives the third vibrating diaphragm to vibrate, the second voice coil is inserted into the outer magnetic gap and drives the second vibrating diaphragm to vibrate; the second vibrating diaphragm is configured to emit bass sound, and high pitch sound emitted by the third vibrating diaphragm is transmitted through the transmission cavity and is emitted out by the first vibrating diaphragm;
the second vibrating diaphragm comprises an inner diaphragm body, an outer diaphragm body, and a framework; the outer diaphragm body is disposed around the inner diaphragm body, the framework comprises a flat plate portion and a first connecting portion, the flat plate portion is connected to the inner diaphragm body and the outer diaphragm body, the first connecting portion extends from the flat plate portion to the outer magnetic gap, and the first connecting portion is connected to the second voice coil.

2. The coaxial speaker according to claim 1 , wherein the magnetic circuit system comprises a magnetic yoke and a primary magnetic portion, the primary magnetic portion is surrounded by the outer magnetic gap; the primary magnetic portion comprises a first magnet, a second magnet, and a primary pole core; the first magnet is fixedly disposed on the magnetic yoke, the second magnet is disposed on one side, facing the first vibrating diaphragm, of the first magnet; the outer periphery of the first vibrating diaphragm and the inner periphery of the second vibrating diaphragm are both fixed to the second magnet; the outer periphery of the third vibrating diaphragm is fixed to one side, facing away from the primary magnetic portion, of the magnetic yoke; a first through hole penetrates through the first magnet, and a second through hole penetrates through the second magnet; the primary pole core comprises a wall portion and a plate portion, the wall portion is inserted into the first through hole, the wall portion divides the first through hole into the inner magnetic gap and an enclosing cavity, the plate portion is connected to the wall portion, the plate portion is clamped between the first magnet and the second magnet; a third through hole penetrates through the magnetic yoke, and the transmission cavity comprises the second through hole, the third through hole, and the enclosing cavity.

3. The coaxial speaker according to claim 2 , wherein the wall portion is of a continuous annular structure.

4. The coaxial speaker according to claim 2 , wherein the magnetic circuit system further comprises a secondary magnetic portion, the secondary magnetic portion is fixedly disposed between the magnetic yoke and the frame, and the secondary magnetic portion and the primary magnetic portion are spaced to form the outer magnetic gap.

5. The coaxial speaker according to claim 4 , wherein the secondary magnetic portion comprises a third magnet and a secondary pole core, the third magnet is fixedly disposed on the magnetic yoke, and the secondary pole core is fixedly disposed between the third magnet and the frame.

6. The coaxial speaker according to claim 5 , wherein the first magnet, the second magnet, and the third magnet are all magnetized along a vibration direction of the vibrating diaphragm, the first magnet and the second magnet are oppositely disposed at a same magnetic pole, and magnetizing directions of the first magnet and the third magnet are opposite.

7. The coaxial speaker according to claim 1 , wherein the framework further comprises a second connecting portion, the second connecting portion extends from the flat plate portion, and the second connecting portion is spaced apart from the first connecting portion; the vibration system further comprises elastic supporting components, a first end of each of the elastic supporting components is connected to the second connecting portion, and a second end of each of the elastic supporting components is connected to the frame.

8. The coaxial speaker according to claim 1 , wherein fixing frames are fixedly disposed on two opposite sides of the magnetic circuit system, the outer periphery of the first vibrating diaphragm and the outer periphery of the third vibrating diaphragm are fixed to inner walls of the fixing frames.

9. The coaxial speaker according to claim 8 , wherein the third vibrating diaphragm comprises a third diaphragm body and a third dome, an outer periphery of the third diaphragm body is fixed to the inner walls of the fixing frames, and an inner periphery of the third diaphragm body is fixed to the third dome.

Assignees

• Aac Microtech Changzhou Co Ltd

Inventors

• Ren Zhang
• Zhong Zhiwei

Classifications

• H04R11/02

  Loudspeakers · CPC title

• H04R9/063

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

• H04R9/025

  Magnetic circuit · CPC title

• H04R7/04 Primary

  Plane diaphragms · CPC title

• H04R1/24 Primary

  Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges · CPC title