WO2022110369A1

WO2022110369A1 - Micro speaker

Info

Publication number: WO2022110369A1
Application number: PCT/CN2020/136977
Authority: WO
Inventors: 梁平
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-11-30
Filing date: 2020-12-16
Publication date: 2022-06-02
Also published as: CN213661927U

Abstract

Provided is a micro speaker, comprising: a basket; and a vibration system and a magnetic circuit system respectively received in the basket. The magnetic circuit system is used to drive the vibration system to vibrate and generate sound. The magnetic circuit system has a magnetic gap. The vibration system comprises a first diaphragm fixed to the basket and a voice coil inserted into the magnetic gap and used to drive the first diaphragm to vibrate. The basket comprises multiple side walls arranged at intervals and a fixing portion connecting two adjacent side walls. The thickness of the fixing portion is greater than the thickness of the side wall. The fixing portion of the basket in the micro speaker has increased thickness, thereby increasing fixing areas thereof at which other elements can be fixed. Accordingly, the micro speaker has a stable structure, and a product has a small size and meets the requirement of compactness.

Description

Micro speaker

technical field

The invention relates to the field of electro-acoustic conversion, in particular to a micro speaker.

Background technique

In recent years, with the rapid development of mobile communication technology, consumers are increasingly using mobile communication devices with voice functions, such as cellular phones, handheld game consoles, and laptop computers. As a voice playback device, the micro-speaker's design directly affects the voice performance of mobile communication equipment products of related technologies. In order to meet the requirements of product thinning and high sound quality, miniature speakers are required to develop in the direction of thinning and high power as much as possible.

In the related art, the miniature speaker includes a basin frame, a magnetic circuit system and a vibration system respectively accommodated in the basin frame, and a lower plate supporting the magnetic circuit system. The magnetic circuit system includes a main magnet located in the middle, a secondary magnet surrounding the main magnet, and a pole core. The vibration system includes a diaphragm and a voice coil that drives the diaphragm to vibrate and sound, and the voice coil is arranged around the main magnet. However, the sound frequency band of such a conventional loudspeaker is narrow, and the structure of the loudspeaker is not stable enough.

Therefore, it is necessary to propose a new technical solution to solve the above problems.

technical problem

The technical problem to be solved by the present invention is to provide a micro-speaker with a sound frequency bandwidth and a stable structure.

technical solutions

The present invention is realized through the following technical solutions: it comprises a basin frame, a vibration system respectively accommodated in the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and emit sound, the magnetic circuit system has a magnetic gap, and the The vibration system includes a first diaphragm fixed on the basin frame, a voice coil inserted in the magnetic gap to drive the first diaphragm to vibrate, wherein the basin frame includes a plurality of side walls arranged at intervals and A fixing part connecting two adjacent side walls, the thickness of the fixing part is greater than the thickness of the side walls.

Preferably, the micro-speaker further includes an elastic sheet fixed on the basin frame, the elastic sheet is electrically connected to the voice coil, and the elastic sheet includes a base sheet and a pair extending from two ends of one side of the base sheet A first fixing piece, the base piece is fixed on the side wall of the basin frame, and the first fixing sheet is fixed on the fixing part of the basin frame.

Preferably, the first vibrating film includes a first vibrating portion, a second vibrating portion located inside the first vibrating portion, a first fixing portion connected to the first vibrating portion and away from the second vibrating portion, and a first vibrating portion extending through the first vibrating portion. the first through hole of the second vibrating part.

Preferably, the basin frame includes an upper surface and an outer surface extending from the upper surface in a direction away from the diaphragm, and the first fixing portion of the first diaphragm is wrapped and fixed on the upper surface and the outer surface of the basin frame at the same time. .

Preferably, the vibration system further comprises a dome assembled on the lower surface of the first diaphragm, a bracket supporting the dome, and a second diaphragm connected to the side of the bracket away from the first diaphragm, the elastic sheet It also includes a pair of curved connecting pieces extending from the two ends of the other side of the base sheet and a pair of second fixing pieces connecting the curved connecting pieces, and the base piece of the elastic sheet is sandwiched between the second diaphragm and the basin frame .

Preferably, the bracket includes a base plate with a second through hole in the center, a wall portion extending from the edge of the base plate in a direction close to the first diaphragm, and a second fixing portion extending from the wall portion, the second fixing portion Connected with the dome, the second fixing piece of the elastic sheet is connected with the base plate of the bracket.

Preferably, the bracket further includes a connecting portion extending from the base plate and disposed around the second through hole, and the voice coil is fixed to the connecting portion.

beneficial effect

The miniature loudspeaker of the invention has the following advantages: the internal space of the loudspeaker is fully utilized, the performance of the whole frequency band is provided, and the product structure is stable.

Description of drawings

FIG. 1 is a three-dimensional combined view of the micro-speaker of the present invention.

FIG. 2 is an exploded perspective view of the micro-speaker of the present invention.

FIG. 3 is an exploded perspective view of the micro-speaker of the present invention from another angle.

FIG. 4 is a cross-sectional view taken along the A-A direction in FIG. 1 .

FIG. 5 is a top view of the basin frame of the micro-speaker of the present invention.

FIG. 6 is a partial combined view of the micro-speaker of the present invention with the bottom plate, the lower magnetic bowl, the second diaphragm and the partition plate removed.

Embodiments of the present invention

The present invention will be further described below with reference to the accompanying drawings and embodiments.

The micro-speaker of the present invention can be applied to portable mobile communication devices, such as electronic products such as mobile phones and game machines.

As shown in FIG. 1 to FIG. 6 , the micro-speaker 100 of the present invention includes a vibration system 1 , a magnetic circuit system 2 and a basin frame 3 respectively accommodating the magnetic circuit system 2 of the vibration system 1 .

As shown in FIG. 2 , the vibration system 1 includes a first diaphragm 11 assembled on the basin frame 3 , a dome 12 assembled on the lower surface of the first diaphragm 11 , a bracket 13 supporting the dome 12 , and connected to both sides of the bracket 13 . A pair of elastic sheets 14 , a pair of second diaphragms 15 respectively connected to the elastic sheets 14 , a voice coil 16 fixed to the bracket 13 , and a diaphragm 17 assembled to the second diaphragm 15 . The elastic sheet 14 is electrically connected to the voice coil 16 . The second diaphragm 15 is connected to the side of the bracket 13 away from the first diaphragm 11 .

The first vibrating film 11 includes an annular first vibrating portion 111 , an annular second vibrating portion 112 located inside the first vibrating portion 111 , a first fixing portion 113 located in the outer ring, and a first vibrating portion 112 penetrating the middle of the second vibrating portion 112 . Via 1120. In this embodiment, the first vibrating portion 111 protrudes toward the elastic sheet 14 , and the second vibrating portion 112 protrudes away from the elastic sheet 14 .

As shown in FIGS. 2 to 4 , the bracket 13 includes a base plate 131 , a second through hole 130 penetrating the middle of the base plate 131 , a wall portion 132 extending from the edge of the base plate 131 to the direction close to the first diaphragm 11 , and a self-contained wall portion 132 . The upper end of the surrounding wall portion 132 is a second fixing portion 133 extending horizontally. The upper surface of the second fixing portion 133 is fixed to the dome 12, and the two can be fixed by gluing. A plurality of through holes 1320 are defined in the wall portion 132 . The bracket 13 further includes a connecting portion 134 extending from the base plate 131 and disposed around the second through hole 130 . The voice coil 16 is fixed to the connecting portion 134 of the bracket 13 .

As shown in FIGS. 2 and 4 , the elastic sheet 14 includes a base sheet 141 , a pair of first fixing sheets 142 extending from two ends of one side of the base sheet 141 , and a pair of curved sheets extending from both ends of the other side of the base sheet 141 The connecting piece 143 and a pair of second fixing pieces 144 connecting the curved connecting piece 143 . The upper surface of the second fixing piece 144 is fixed to the lower surface of the base plate 131 of the bracket 13 . The substrate 141 is fixed to the second diaphragm 15 . Specifically, the substrate 141 is sandwiched between the second diaphragm 15 and the basin frame 3 . In this embodiment, the elastic sheet 14 is made of FPC material.

The second diaphragm 15 includes a vibrating portion 151 protruding in a direction away from the first vibrating film 11 , and a third fixing portion 152 located on both sides of the vibrating portion 151 . The third fixing portion 152 is fixed to the lower surface of the base sheet 141 of the elastic sheet 14 and the second fixing sheet 143 . The diaphragm 17 is assembled under the second diaphragm 15 .

As shown in FIGS. 2 to 5 , the basin frame 3 includes four side walls 31 that together form the receiving space 30 and four fixing portions 32 that connect two adjacent side walls 31 . The basin frame 3 includes an upper surface 33 and an outer surface 34 bent from the upper surface 33 and extending in a direction away from the first diaphragm 11 . The thickness of the fixing portion 32 is D, and the thickness of the side wall 31 is d. In this embodiment, the thickness D of the fixing portion 32 is greater than the thickness d of the side wall 31 . Preferably, the ratio of the thickness D of the fixing portion 32 to the thickness d of the side wall 31 is 2:1, which is more conducive to the stable connection between the elastic sheet 14 and the basin frame 3 .

The first fixing portion 113 of the first diaphragm 11 is wrapped and fixed on the upper surface 33 and the outer surface 34 of the basin frame 3 . The first fixing piece 142 of the elastic piece 14 is fixed to the fixing portion 32 of the basin frame 3 , because the thickness of the fixing portion 32 is greater than the thickness of the side wall 31 . Through such a design, the fixed area of the first diaphragm 11 , the elastic sheet 14 and the basin frame 13 can be increased, thereby improving the stability of the structure.

The magnetic circuit system 2 includes a lower magnetic bowl 22 , a first main magnetic steel 23 assembled in the lower magnetic bowl 22 , a bottom plate 4 assembled in the lower magnetic bowl 22 and disposed away from the first main magnetic steel 23 , and located in the first main magnetic steel. The four auxiliary magnets 24 around the steel 23, the first pole core 25 assembled to the first main magnet 23, the second main magnet 26 assembled to the first pole core 25, the The upper magnetic bowl 21 and the collar 27 assembled to the upper magnetic bowl 21 .

The upper magnetic bowl 21 includes a top plate 211 , four side plates 212 extending from four sides of the top plate 211 in a direction away from the first diaphragm 11 , and four flanges 213 extending horizontally from each side plate 212 . The top plate 211 is fixed to the second main magnetic steel 26 , the side plate 212 surrounds the second main magnetic steel 26 and the first pole core 25 , and the four flanges 213 are respectively fixed to the four auxiliary magnetic steels 24 . The upper surface area of the top plate 211 is less than or equal to the area of the first through hole 1120 of the first diaphragm 11 . The collar 27 is sleeved on the top plate 211 .

The lower magnetic bowl 22 is in the shape of a disk, and includes fixing plates 221 on both sides of the lower magnetic bowl 22 and receiving grooves 220 for receiving the first main magnetic steel 23 and the auxiliary magnetic steel 24 . The fixing plate 221 is fixed to the partition plate 17 .

According to this design, the first main magnetic steel 23 , the second main magnetic steel 26 , the secondary magnetic steel 22 , the upper magnetic bowl 21 and the lower magnetic bowl 22 together form a magnetic gap 27 . The voice coil 15 is suspended in the magnetic gap 27 , the voice coil 15 is electrically connected to the elastic sheet 14 , and the bottom plate 4 is assembled to the lower magnetic bowl 22 .

The micro-speaker 100 of the present invention adopts a plurality of diaphragms and a plurality of magnetic steels, and makes full use of the internal space of the loudspeaker, thereby increasing the working frequency band and improving the acoustic performance, and by thickening the local thickness of the basin frame, thereby strengthening other components The fixation with the basin frame improves the stability of the product.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims

A miniature loudspeaker comprises a basin frame, a vibration system respectively accommodated in the basin frame and a magnetic circuit system for driving the vibration system to vibrate and emit sound, the magnetic circuit system has a magnetic gap, and the vibration system includes a The first diaphragm of the basin frame, and the voice coil inserted in the magnetic gap to drive the vibration of the first diaphragm, is characterized in that: the basin frame includes a plurality of side walls arranged at intervals and a connection between adjacent two The fixing portion of each side wall, the thickness of the fixing portion is greater than the thickness of the side wall.
The micro-speaker according to claim 1, wherein the micro-speaker further comprises an elastic sheet fixed on the basin frame, the elastic sheet is electrically connected with the voice coil, and the elastic sheet comprises a base sheet and a self- A pair of first fixing pieces extending from two ends of one side of the base sheet, the base sheet is fixed to the side wall of the basin frame, and the first fixing sheet is fixed to the fixing part of the basin frame.
The micro-speaker according to claim 2, wherein the first vibrating film comprises a first vibrating part, a second vibrating part located inside the first vibrating part, connected to the first vibrating part and away from the The first fixing part of the second vibrating part and the first through hole passing through the second vibrating part.
The micro-speaker according to claim 3, wherein the basin frame includes an upper surface and an outer surface extending from the upper surface in a direction away from the diaphragm, and the first fixing portion of the first diaphragm is wrapped and fixed at the same time on the upper and outer surfaces of the pot holder.
The micro-speaker according to claim 4, wherein the vibration system further comprises a dome assembled on the lower surface of the first diaphragm, a bracket supporting the dome, and a side of the bracket away from the first diaphragm Connected second diaphragms, the elastic sheet further includes a pair of curved connecting sheets extending from two ends of the other side of the base sheet and a pair of second fixing sheets connecting the curved connecting sheets, the base sheet clip of the elastic sheet It is arranged between the second diaphragm and the basin frame.
The micro-speaker according to claim 5, wherein the bracket comprises a base plate with a second through hole in the center, a wall portion extending from the edge of the base plate in a direction close to the first diaphragm, and a wall portion extending from the wall portion. A second fixing part, the second fixing part is connected with the dome, and the second fixing piece of the elastic sheet is connected with the base plate of the bracket.
The micro-speaker according to claim 6, wherein the bracket further comprises a connecting portion extending from the base plate and disposed around the second through hole, and the voice coil is fixed to the connecting portion.