WO2022126763A1

WO2022126763A1 - Loudspeaker cabinet

Info

Publication number: WO2022126763A1
Application number: PCT/CN2020/141449
Authority: WO
Inventors: 任璋; 钟志威
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-12-18
Filing date: 2020-12-30
Publication date: 2022-06-23
Also published as: CN213906847U

Abstract

Provided is a loudspeaker cabinet. The loudspeaker cabinet comprises a shell with an accommodating space, a sound production unit accommodated in the shell and dividing the accommodating space into a front cavity and a rear cavity, and a soldering lug. The sound production unit comprises a diaphragm, a voice coil for driving the diaphragm to vibrate and produce sound, and a flexible circuit board electrically connected to the voice coil; the shell is further provided with a bottom wall which is opposite to the diaphragm and forms the front cavity with the diaphragm in an enclosing manner; a boss is formed by extending from the bottom wall to the interior of the rear cavity; the soldering lug is provided with an electrical connection portion fixed on the boss; the flexible circuit board extends to form a solder pad parallel to the bottom wall; the solder pad is arranged on the electrical connection portion; a through hole is formed in the solder pad in a penetrating manner; a protrusion penetrating through the through hole is arranged on the electrical connection portion; and the protrusion is tin-soldered to the solder pad. According to the loudspeaker cabinet provided in the present invention, it is ensured that the soldering lug and the flexible circuit board bear a certain pulling force in the horizontal direction, and furthermore, by means of the structure of the protrusion, a superficial area in contact with a tin layer is increased, thereby ensuring that the soldering lug and the flexible circuit board have good soldering and conduction effects.

Description

speaker box

technical field

The present invention relates to the field of sound and electricity, in particular to a speaker box used in portable electronic products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is the high-quality music function. Therefore, speaker boxes for playing sound are widely used in today's smart mobile devices.

The speaker box includes a casing and a sound generating unit accommodated in the casing. In the related art, the flexible circuit board inside the sounding unit is welded with the solder tab by means of hot-pressure melting tin welding. However, the single-panel welding has the problem of insufficient tension.

Therefore, it is necessary to provide a new speaker box to solve the above technical problems.

technical problem

The purpose of the present invention is to provide a loudspeaker box, which can not only ensure that the solder piece and the flexible circuit board bear a certain pulling force in the horizontal direction, but also increase the surface area in contact with the tin layer by the convex hull structure, so as to ensure the welding Sheets and flexible circuit boards have good soldering and conduction effects.

technical solutions

In order to achieve the above object, the present invention provides a speaker box, which includes a casing with a receiving space, a sounding unit and a soldering piece that are contained in the casing and divide the receiving space into a front cavity and a rear cavity. The sound generating unit includes a diaphragm, a voice coil that drives the diaphragm to vibrate and sound, and a flexible circuit board that is electrically connected to the voice coil. A bottom wall enclosing the front cavity is formed, a boss is formed extending from the bottom wall to the rear cavity, the solder tab has an electrical connection part fixed on the boss, and the flexible circuit board A pad is extended and formed parallel to the bottom wall, the pad is arranged on the electrical connection part, a through hole is formed on the pad, and a through hole is formed on the electrical connection part. The convex hull of the through hole, the convex hull and the pad are soldered with tin.

Preferably, a plurality of the pads are provided, and the plurality of the pads are distributed along the vibration direction perpendicular to the diaphragm.

Preferably, the soldering piece includes a main body portion fixed on the bottom wall, a first electrical connection portion extending from the main body portion to the outside of the receiving space and fixed on the bottom wall, a first electrical connection portion bent from the main body portion an extension part formed by folding and extending and fixed on the boss; and a second electrical connecting part formed by bending and extending from the extension part and fixed on the boss, the second electrical connecting part is away from the boss One side of the bottom wall is exposed, wherein the electrical connection portion is the second electrical connection portion.

Preferably, the main body part and the first electrical connection part are injection-molded and fixed on the bottom wall, the extension part is injection-molded and fixed in the boss, and the second electrical connection part is injection-fixed on the boss .

Preferably, the main body is provided with positioning holes.

Preferably, a surface of the second electrical connection portion on a side away from the extension portion and a surface of the boss on a side away from the bottom wall are coplanar.

Preferably, the housing includes a front cover and a rear cover that is enclosed with the front cover to form the receiving space, and the bottom wall and the boss are located on the front cover.

Preferably, the front cover includes a plastic part and a reinforcing rigid body that is injection-molded and fixed to the plastic part, and the solder tab is injection-molded and fixed to the plastic part.

Preferably, the reinforcing rigid body comprises a main body and a plurality of surrounding walls extending from the main body into the plastic part, the surrounding walls enclose a conical through hole, and the conical through hole is formed by the plastic part. The conical through hole includes a first opening and a second opening, the first opening and the second opening are respectively provided at both ends of the conical through hole, and the second openings are opposite to each other. As the first opening is closer to the receiving space, the size of the tapered through hole gradually decreases along the direction from the first opening to the second opening.

Preferably, the reinforcing rigid body is made of metal material.

beneficial effect

Compared with the related art, in the speaker box of the present invention, a through hole structure is arranged on the pad, and a bump hull passing through the through hole is added to the solder pad, and the bump hull and the pad are soldered with tin. . In this way, not only can the mating structure of the convex hull and the through hole ensure that the solder tab and the flexible circuit board bear a certain pulling force in the horizontal direction, but also the convex hull structure increases the surface area in contact with the tin layer, so as to ensure the solder lug and the flexible circuit. The board has good soldering and conduction effect.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

FIG. 1 is an exploded view of a preferred embodiment of the speaker box of the present invention.

FIG. 2 is a schematic structural diagram of a sound-generating unit in the speaker box shown in FIG. 1 .

FIG. 3 is a schematic structural diagram of a soldering piece in the speaker box shown in FIG. 1 .

FIG. 4 is a schematic structural diagram of the speaker box shown in FIG. 1 after the front cover and the solder tab are assembled.

FIG. 5 is a schematic structural diagram of the assembled speaker box shown in FIG. 1 .

FIG. 6 is a cross-sectional view of the speaker box shown in FIG. 5 along the direction A-A.

FIG. 7 is an enlarged view of part a in the speaker box shown in FIG. 6 .

FIG. 8 is a cross-sectional view of the speaker box shown in FIG. 5 along the B-B direction.

Embodiments of the present invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1 to FIG. 8 , the speaker box includes a housing 1 having a accommodating space 1A, a sounding unit 3 accommodated in the housing 1 and dividing the accommodating space 1A into a front cavity 1B and a rear cavity 1C and solder tab 4. Wherein, the casing 1 is further provided with a sound guiding channel 2 that communicates with the outside world and the front cavity 1B.

The sound generating unit 3 includes a diaphragm 31 , a voice coil 33 that drives the diaphragm 31 to vibrate and sound, and a flexible circuit board 35 that is electrically connected to the voice coil 33 . The voice coil can drive the diaphragm 31 to vibrate and emit sound after being energized, and the sound generated by the vibration of the diaphragm 31 is transmitted to the outside through the front cavity 1B and the sound guide channel 2 in sequence.

The housing 1 also has a bottom wall 1D which is arranged opposite the diaphragm 31 and encloses the diaphragm 31 to form the front cavity 1B, and extends from the bottom wall 1D to the rear cavity 1C. There are bosses 5.

The solder tab 4 has an electrical connection portion fixed to the boss 5 .

In this embodiment, the solder tab 4 includes a main body portion 41 fixed on the bottom wall 1D, a first electrical circuit extending from the main body portion 41 to the outside of the receiving space 1A and fixed on the bottom wall 1D. The connection portion 43 , the extension portion 45 formed by bending and extending from the main body portion 41 and fixed to the boss 5 , and the second electrical connection formed by bending and extending from the extension portion 45 and fixed to the boss 5 part 47 , wherein the first electrical connection part 43 is electrically connected to an external circuit, the electrical connection part is the second electrical connection part 47 , and the second electrical connection part 47 is far away from the boss 5 One side of the bottom wall 1D is exposed.

In this embodiment, the main body portion 41 and the first electrical connection portion 43 are injection-molded and fixed to the bottom wall 1D, the extension portion 45 is injection-molded and fixed in the boss 5 , and the second electrical connection is performed. The portion 47 is injection-molded and fixed to the boss 5 .

As shown in FIG. 4 , the solder pad 351 is far away from the outer contour of the product (the solder pad 4 has a longer length), and the first electrical connection of the solder pad 4 cannot be guaranteed depending on the strength of the solder pad 4 itself The relative position of the part 43 and the second electrical connection part 47 in the injection mold. In this embodiment, the main body portion 41 is provided with a positioning hole 411 . By arranging the positioning holes 411 on the main body portion 41 , the relative positions of the first electrical connection portion 43 and the second electrical connection portion 47 in the injection mold can be ensured.

In this embodiment, the surface of the second electrical connection portion 47 on the side away from the extension portion 45 and the surface of the boss 5 away from the bottom wall 1D are coplanar.

The flexible circuit board 35 is extended with pads 351 parallel to the bottom wall 1D, and the pads 351 are provided on the electrical connection portion 47 .

A through hole 353 is formed through the bonding pad 351 , and a bump 471 passing through the through hole 353 is formed on the electrical connection portion 47 , and the bump 471 and the bonding pad 351 are soldered with tin.

In this embodiment, a plurality of the pads 351 are provided, and the plurality of the pads 351 are distributed along the vibration direction perpendicular to the diaphragm 31 .

As shown in FIG. 1 , FIG. 2 and FIG. 4 , there are two pads 351 and two pads 4 , and the two pads are positive pads and negative pads respectively, and are located in the sounding unit. On the same side of the body 3, the two welding pieces 4 are the positive electrode welding piece and the negative electrode welding piece respectively. It can be understood that, in other embodiments, grounding pads and grounding pads may also be provided.

The housing 1 includes a front cover 11 and a rear cover 13 enclosed with the front cover 11 to form the accommodating space 1A, the bottom wall 1D and the boss 5 are located on the front cover 11 , the The sound guide channel 2 is formed on the front cover 11 .

In this embodiment, the front cover 11 includes a plastic part 111 and a reinforcing rigid body 113 which is injection-molded and fixed to the plastic part 111 , and the welding piece 4 is injection-molded and fixed to the plastic part 111 . That is to say, at least a part of the plastic part 111 is located on the bottom wall 1D so that the main body part 41 and the first electrical connection part 43 can be injection-molded and fixed on the bottom wall 1D, the plastic part 111 at least Another part constitutes the boss 5 so that the extension part 45 and the second electrical connection part 47 can be injection-molded and fixed to the boss 5 .

Wherein, the sound guiding channel 2 is formed on the plastic part 111 .

The reinforcing rigid body 113 includes a main body 114 and a plurality of surrounding walls 115 extending from the main body 114 into the plastic part 111 . The surrounding walls 115 enclose a conical through hole 116 , and the conical through hole 116 is filled with the plastic of said plastic piece 111 .

The tapered through hole 116 includes a first opening 117 and a second opening 118, the first opening 117 and the second opening 118 are respectively provided at both ends of the tapered through hole 116, and the second opening 118 is closer to the receiving space 1A than the first opening 117 , and the size of the tapered through hole 116 gradually decreases along the direction from the first opening 117 to the second opening 118 . The size of the tapered through hole 116 is set to gradually decrease along the direction from the first opening 117 to the second opening 118 , so that the reinforcing rigid body 113 has a higher height after being fixed to the plastic part 111 by injection molding. connection strength.

In this embodiment, the reinforcing rigid body 113 is made of metal material. The reinforcing rigid body 113 made of metal material not only helps to strengthen the strength of the front cover 11, but also helps to dissipate heat from the speaker box. Normally, the reinforcing rigid body 113 is made of steel material.

It can be understood that, in other embodiments, the composition of the front cover 11 is not limited to this, for example, the front cover 11 can also be configured to be made of plastic only.

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 loudspeaker box includes a casing with a receiving space, a sound-producing unit and a soldering piece that are contained in the casing and divide the receiving space into a front cavity and a rear cavity, and the sound-producing unit includes a vibrating membrane, a driver The diaphragm vibrates and emits a voice coil and a flexible circuit board that is electrically connected to the voice coil, and the casing also has a bottom opposite to the diaphragm and enclosing the diaphragm to form the front cavity a wall, a boss extending from the bottom wall to the rear cavity is formed, the solder tab has an electrical connection part fixed on the boss, and the flexible circuit board is extended and formed parallel to the bottom wall The pad is arranged on the electrical connection part, and it is characterized in that a through hole is formed through the pad, and a protrusion passing through the through hole is arranged on the electrical connection part. The convex hull is soldered with the solder pad by tinning.
The speaker box according to claim 1, wherein a plurality of the pads are provided, and the plurality of the pads are distributed along a vibration direction perpendicular to the diaphragm.
The speaker box according to claim 1, wherein the soldering piece comprises a main body portion fixed to the bottom wall, a first portion extending from the main body portion to the outside of the accommodating space and fixed to the bottom wall an electrical connection portion, an extension portion formed by bending and extending from the main body portion and fixed to the boss, and a second electrical connection portion formed by bending and extending from the extension portion and fixed on the boss, the The second electrical connection portion is exposed on the side of the boss away from the bottom wall, wherein the electrical connection portion is the second electrical connection portion.
The speaker box according to claim 3, wherein the main body part and the first electrical connection part are injection-molded and fixed to the bottom wall, the extension part is injection-molded and fixed in the boss, and the first electrical connection part is injection-molded and fixed to the bottom wall. The two electrical connection parts are injection-molded and fixed on the boss.
The speaker box according to claim 4, wherein a positioning hole is provided on the main body.
The speaker box according to claim 4, wherein a surface of the second electrical connection portion on a side away from the extension portion and a surface of the boss on a side away from the bottom wall are coplanar.
The speaker box according to any one of claims 2-6, wherein the casing comprises a front cover and a rear cover enclosed with the front cover to form the accommodating space, the bottom wall and the The boss is located on the front cover.
The speaker box according to claim 7, wherein the front cover comprises a plastic part and a reinforcing rigid body injection-molded and fixed to the plastic part, and the solder tab is injection-molded and fixed to the plastic part.
The speaker box according to claim 8, wherein the reinforcing rigid body comprises a main body and a plurality of surrounding walls extending from the main body into the plastic part, the surrounding walls enclosing a conical through hole , the conical through hole is filled with the plastic of the plastic part, the conical through hole includes a first opening and a second opening, and the first opening and the second opening are respectively provided in the conical through hole At both ends of the hole, the second opening is closer to the receiving space than the first opening, and the size of the tapered through hole gradually decreases along the direction from the first opening to the second opening.
The speaker box according to claim 9, wherein the reinforcing rigid body is made of a metal material.