Multi-driver ultra-thin speakers

Abstract

The present invention discloses a multi-drive ultra-thin speaker, comprising a housing, a diaphragm connected and fixed to the housing, and at least two independent drive units, the drive unit comprising a voice coil unit and a magnetic circuit unit arranged corresponding to the voice coil unit, the housing comprising at least two mounting holes arranged side by side, the magnetic circuit unit being arranged in the mounting holes correspondingly, the voice coil unit being further connected and fixed with a centering support plate, the end of the centering support plate away from the voice coil unit being fixed to the housing, and a sound outlet hole for sound emission being arranged on the side wall of the housing. The multi-drive ultra-thin speaker of the present invention has a simple structure, high space utilization, a large effective radiation area, and good acoustic performance.

Description

Technical Field

[0001] The present invention relates to the field of electroacoustics, and in particular to a multi-driver ultra-thin speaker. Background Art

[0002] With the continuous progress and innovation of technology, more and more consumer electronic products are gradually entering the public's field of vision in different forms, such as flat-panel TVs, which have become popular. However, as electronic products are becoming increasingly lightweight and miniaturized, the thickness of TVs is also becoming thinner and thinner. Although it brings people high-definition and ultra-thin visual enjoyment, it inevitably leads to weak sound quality, which is even not as full and rich as the sound quality of CRT electroacoustics, and consumers' auditory needs are difficult to be met. Based on this, soundbar speaker products began to appear, which have a certain effect on improving the sound quality of flat-panel TVs.

[0003] Undoubtedly, for the design of any speaker product, the realization of its acoustic part is crucial, and among them, the speaker has become the main focus. In the prior art, such products usually use several circular monomers to be mechanically assembled and placed on the box. The effective radiation area of ​​the product is very limited, the acoustic performance is not ideal, and the product size and volume are large, occupying more box space. Considering that soundbar speaker products will play an increasingly important role in the speaker playback system of audio terminals such as flat-screen TVs, this application provides a new idea for the design of the speaker module, in order to better solve the above problems. Summary of the invention

[0004] In view of the above problems, the technical problem to be solved by the present invention is: to provide a multi-driver ultra-thin speaker, to increase the effective radiation area of ​​the product, and to obtain more optimized acoustic performance by using multi-magnetic circuit drive.

[0005] In order to solve the above problems, the technical solution of the present invention is:

[0006] A multi-drive ultra-thin speaker comprises a shell, a diaphragm connected and fixed to the shell, and at least two independent drive units; the drive unit comprises a voice coil unit and a magnetic circuit unit arranged corresponding to the voice coil unit, wherein the shell comprises at least two mounting holes arranged side by side, and the magnetic circuit unit is arranged correspondingly in the mounting holes; the voice coil unit is also connected and fixed with a centering support plate, and one end of the centering support plate away from the voice coil unit is fixed to the shell; and a sound outlet hole for sound emission is arranged on the side wall of the shell.

[0007] As an improvement, the diaphragm is provided with a rectangular diaphragm, including an edge portion bonded and fixed to the shell and a folded ring arranged on the inner side of the edge portion; a flat dome is combined with the center position of the diaphragm.

[0008] As an improvement, the dome is a foamed structure.

[0009] As an improvement, the dome is a PMI foam structure or a resin foam structure.

[0010] As an improvement, the shell is a rectangular structure, and a signal access terminal electrically connected to the lead wire of the voice coil is provided on the long axis side wall of the shell; the centering support plate is a rectangular ring structure, and a cut-out clearance portion is provided in the short axis direction of the centering support plate; the lead wire of the voice coil is led out from the clearance portion and electrically connected to the terminal.

[0011] As an improvement, the driving unit includes two voice coil units and two magnetic circuit units corresponding to the two voice coil units; the voice coil unit includes a voice coil and a frame supporting the voice coil; the magnetic circuit unit is designed to be circular, including a T-iron and a magnet and a washer mounted on the outer periphery of the T-iron.

[0012] As an improvement, the centering support plate includes an inner edge located on the inner side, an outer edge located on the outer side, and a connecting section arranged between the inner edge and the outer edge; the outer edge is bonded and fixed to the outer shell, and the inner edge is bonded and fixed to the outer surface of the frame.

[0013] As an improvement, the connecting sections of the centering support plate are evenly spaced, each of the connecting sections is an upwardly protruding structure, and the protruding heights of the connecting sections are all the same.

[0014] As an improvement, the sound outlet holes are arranged on the long-axis side wall of the shell, and two sound outlet holes are arranged on each long-axis side wall.

[0015] As an improvement, a front acoustic cavity is formed between the front space of the diaphragm and the side wall of the shell; and a rear acoustic cavity is formed between the rear space of the diaphragm and the side wall and the bottom wall of the shell.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are:

[0017] Since the multi-driver ultra-thin speaker involved in the present invention includes at least two independent driver units, and the magnetic circuit units are correspondingly installed in the mounting holes on the outer shell, this structural design can maximize the use of the volume of the product. At the same time, with the help of the driving force of multiple magnetic circuits, its acoustic performance will be better than that of the existing structural design.

[0018] Since there is a centering support plate connected between the voice coil unit and the housing, the centering support plate can be adaptively designed according to the product's external dimensions, maximizing the product's compliance and improving the low-frequency response while playing a good centering role. In addition, since there is a cut-out clearance portion in the short axis direction of the centering support plate, the voice coil lead wire is easy to lead out. In this way, when working at high power, even if the amplitude of the vibration system is large, the voice coil lead wire will not hit other components to prevent noise.

[0019] Due to the multi-driver ultra-thin speaker of the present invention, multiple magnetic circuit units share a rectangular diaphragm and a flat dome. This flat dome structure can maximize the use of the effective radiation area and further optimize the acoustic performance of the product. In addition, since the dome is designed as a foaming structure, it has low density, light weight and good rigidity, which can not only ensure high sensitivity, but also make the product not easy to polarize, and the product has a good frequency response.

[0020] To sum up, the multi-drive ultra-thin speaker of the present invention can not only obtain greater driving force through the setting of multiple magnetic circuits, but also form a large-area radiation system between the diaphragm, the centering support and the frame. Combined with the good centering effect of the centering support, it can provide consumers with better sound quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an exploded view of a multi-driver ultra-thin speaker according to an embodiment of the present invention;

[0022] Figure 2 4 is a cross-sectional view of a multi-driver ultra-thin speaker according to an embodiment of the present invention.

[0023] The reference numerals include: 1, dome, 2, diaphragm, 3, centering support, 31, outer edge, 32, inner edge, 33, connecting section, 34, yielding portion, 4, voice coil unit, 41, voice coil, 411, lead wire, 42, frame, 5, shell, 6, washer, 7, magnet, 8, T iron, 9, signal access terminal, 10, sound outlet hole, 11, front sound cavity, 12, rear sound cavity. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] The multi-drive ultra-thin speaker of the present invention is a multi-drive sound generator structure, including at least two independent drive units, each of which includes a voice coil unit and a magnetic circuit unit that cooperates with the voice coil unit and is correspondingly arranged. For ease of description, the following is a detailed description of the implementation of two drive units as an example.

[0026] Example:

[0027] like Figure 1 , Figure 2 As shown together, the multi-drive ultra-thin speaker of this embodiment includes two drive units, namely, two voice coil units 4 and two corresponding magnetic circuit units, wherein the voice coil unit 4 includes a voice coil 41 and a skeleton 42 supporting the voice coil, and the voice coil 41 is connected to a vibration component (for example, connected to the dome 1) through the skeleton 42. The vibration component includes a rectangular diaphragm 2 and a dome 1 combined in the middle position of the diaphragm 2, and the dome 1 is designed to be flat. It should be noted that the diaphragm 2 and the dome 1 here are both similar to long strip structures. This structural design can maximize the use of the effective radiation area and further optimize the acoustic performance of the product. The diaphragm 2 includes an edge portion bonded and fixed to the outer shell 5 and a folding ring arranged on the inner side of the edge portion, and the folding ring can be a convex or concave structure.

[0028] The magnetic circuit unit includes a T-iron 8, a magnet 7 and a washer 6 mounted on the T-iron 8, wherein the T-iron 8 includes a circular base and a core column extending vertically upward from the middle of the base, the magnet 7 and the washer 6 are both circular, and have holes in the middle, and the diameter of the holes should be larger than the outer diameter of the core column of the T-iron 8. The gap between the two forms a magnetic gap of the magnetic circuit system, and the lower end of the voice coil 41 is accommodated in the magnetic gap.

[0029] To facilitate assembly, two mounting holes can be arranged side by side on the outer shell 5, and the magnetic circuit unit is correspondingly assembled at each mounting hole. During implementation, the bottom of the outer shell can be a hollow design, or a part corresponding to the size of the magnetic circuit can be dug out on the bottom wall of the outer shell, mainly depending on the size of the base of the T-iron 8.

[0030] The housing 5 is also provided with a signal access terminal 9, which may be a conductive structure such as a spring, a pad or an FPCB (flexible printed circuit board). Taking the spring as an example, it may be integrally injection molded with the housing 5, and the molding process is simple.

[0031] The usual electrical connection structure is: the lead wire 411 of the voice coil is electrically connected to the signal input terminal 9, and the signal input terminal 9 is connected to the external circuit, so that the current signal is input into the voice coil 41, and the voice coil 41 will make a reciprocating motion of cutting the magnetic flux lines under the action of the electromagnetic field, and drive the diaphragm 2 to vibrate through the skeleton 42, and the sound waves generated by the vibration can be radiated to the outside through the sound outlet 10 on the shell 5. In this embodiment, the sound outlet 10 is opened on the two long-axis side walls of the shell 5, and there can be two or more sound outlet holes on each long-axis side wall, preferably evenly arranged at equal intervals, so that the sound waves radiate outward more evenly. Of course, for the present technical solution, the number of sound outlet holes 10 is not limited to two or more, and it is only a schematic enumeration here, and it can be designed to be one.

[0032] In addition, the centering support plate 3 of the multi-drive ultra-thin speaker of this embodiment can be designed according to the external dimensions of the product, rather than adopting the traditional circular design. In this embodiment, the centering support plate 3 is designed to be rectangular in shape, which can maximize the compliance of the product, improve the low-frequency response, and also play a good centering role. In the traditional speaker structure, the voice coil lead wire 411 usually needs to be led out from between the centering support plate and the dome, but this lead-out method is easy to hit other components when the product is working at high power. This part is also improved in this technical solution, that is, the centering support plate 3 is cut in the short axis direction, so that the voice coil lead wire 411 can be easily led out and connected to the signal access terminal 9. Specifically, welding conduction, conductive adhesive bonding, etc. can be used, which will not be repeated here.

[0033] As mentioned above, the centering support 3 of this embodiment is actually a ring with a rectangular outline, including an outer edge 31, an inner edge 32, and a connecting section 33 connecting the outer edge 31 and the inner edge 32, wherein the outer edge 31 is bonded and fixed to the side wall of the housing 5, and the inner edge 32 is bonded and fixed to the outer side of the frame 42, which plays a centering role. It is not difficult to see that the centering support 3 is different from the centering support structure in the traditional speaker structure, and its connecting section 33 is not a closed structure, but is disconnected, and the disconnected part is the aforementioned cut-off part. Because the centering support 3 has a rectangular outline, the centering support 3 can be defined as including two long axes and two short axes, and can be specifically cut in a direction parallel to the short axis, and the cut-off part is used as a make-away portion 34 for the lead-out wire 411 to be led out. In this way, when working at high power, even if the amplitude of the vibration system is large, the voice coil lead-out wire will not hit other components to prevent noise.

[0034] The connecting segments 33 referred to herein include a plurality of connecting segments 33, which are evenly spaced, each of which is a structure protruding upward, and the protruding heights of the connecting segments are the same. Of course, the specific structural design of the centering support 3 can be adaptively adjusted according to the shape and size of the product. This is just a specific implementation example and is not limited thereto.

[0035] Preferably, the dome 1 is a foam structure, which can be specifically PMI foam or resin foam, or a combination of foam material and glass fiber, wood board, etc., that is, the dome 1 can be a single-layer foam structure or a composite structure. The flat dome 1 adopts a foam structure with low density, light weight and good rigidity, which can ensure high sensitivity and ensure that the product is not easy to polarize and has good frequency response.

[0036] In the present technical solution, the front space of the centering support 3 forms a front acoustic cavity 11, and the rear space of the centering support 3 forms a rear acoustic cavity 12. Specifically, the space between the centering support 3, the skeleton 42, the diaphragm 2 and the side wall of the outer shell 5 forms the front acoustic cavity 11, and the space between the centering support 3, the magnetic circuit unit and the side wall of the outer shell 5 forms the rear acoustic cavity 12, wherein the sound outlet 10 and the front acoustic cavity 11 are interconnected, and the rear acoustic cavity 12 needs to be designed to be acoustically sealed, and the front acoustic cavity 11 and the rear acoustic cavity 12 are also isolated from each other.

[0037] Compared with the prior art, the multi-driver ultra-thin speaker of the present invention can be made thinner when applied to products similar to soundbar speakers. It is a long and narrow sound-emitting device, and utilizes a structure of multiple magnetic circuits + multiple voice coils + multiple centering supports + a diaphragm + a flat dome to maximize the use of product space, greatly increase the effective radiation area of ​​the product, and help improve the sound quality of the product.

[0038] The above are merely implementation examples of the present invention and are not intended to limit the present invention. Any equivalent modifications or changes made by ordinary technicians in the field based on the contents disclosed in the present invention should be included in the protection scope recorded in the claims.

Claims

1. A multi-driver ultra-thin speaker, comprising a housing, a diaphragm connected and fixed to the housing, and at least two independent drive units; the drive unit comprises a voice coil unit and a magnetic circuit unit corresponding to the voice coil unit, the voice coil unit comprises a voice coil and a frame supporting the voice coil; characterized in that: The shell includes at least two mounting holes arranged side by side, and the magnetic circuit unit is correspondingly arranged in the mounting holes; the voice coil unit is connected and fixed with a centering support plate, and one end of the centering support plate away from the voice coil unit is fixed on the shell; the shell is a rectangular structure, and a signal access terminal electrically connected to the lead wire of the voice coil is arranged on the long axis side wall of the shell, and a sound outlet hole for sound emission is arranged on the side wall of the shell; the centering support plate is a ring with a rectangular contour, and a cut-out paving portion is arranged in the short axis direction of the centering support plate, and the centering support plate includes an inner edge located on the inner side, an outer edge located on the outer side, and a connecting section arranged between the inner edge and the outer edge, the outer edge is bonded and fixed to the shell, and the inner edge is bonded and fixed to the outer surface of the frame, wherein the connecting section is not a closed structure, and has a disconnection, and the disconnection is a cut-out portion; the lead wire of the voice coil is led out from the paving portion and is electrically connected to the terminal.

2. The multi-driver ultra-thin speaker according to claim 1, characterized in that: The diaphragm is provided with a rectangular diaphragm, including an edge portion bonded and fixed to the shell and a folding ring arranged on the inner side of the edge portion; a flat ball top is combined at the center position of the diaphragm.

3. The multi-driver ultra-thin speaker according to claim 2, characterized in that: The dome is a foaming structure.

4. The multi-driver ultra-thin speaker according to claim 3, characterized in that: The dome is a PMI foam structure or a resin foam structure.

5. The multi-driver ultra-thin speaker according to claim 1, characterized in that: The driving unit includes two voice coil units and two magnetic circuit units corresponding to the two voice coil units; the magnetic circuit unit is designed to be circular, including a T-iron and a magnet and a washer sleeved on the outer circumference of the T-iron.

6. The multi-driver ultra-thin speaker according to claim 5, characterized in that: The connecting sections of the centering support plates are arranged at even intervals, each of the connecting sections is an upwardly protruding structure, and the protruding heights of the connecting sections are all the same.

7. The multi-driver ultra-thin speaker according to claim 1, characterized in that: The sound outlet holes are arranged on the long-axis side wall of the shell, and two sound outlet holes are arranged on each long-axis side wall.

8. The multi-driver ultra-thin speaker according to claim 7, characterized in that: The space between the centering support plate, the frame, the diaphragm and the side wall of the shell forms a front sound cavity; the space between the centering support plate, the magnetic circuit unit and the side wall of the shell forms a rear sound cavity; the sound outlet is connected to the front sound cavity.

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