Miniature loudspeaker

Abstract

The invention relates to the technical field of loudspeakers, in particular to a miniature loudspeaker which comprises a box body composed of an upper shell and a lower shell, and a loudspeaker and BASS powder arranged in a cavity of the box body. A first metal sheet and a second metal sheet are embedded in the upper shell and the lower shell through injection molding in an integrated mode, and metal is used for reinforcement. The metal sheet is pretreated to increase the roughness, and multiple structures such as the material passing hole with the countersunk head chamfer and the first folded edge with the clamping groove are designed, so that the binding force of the metal sheet and the plastic is enhanced, and the firm combination of the metal and the plastic is realized. The internal cavity is divided into an independent positioning cavity and an independent filling cavity through the support, the positioning cavity and the filling cavity are used for installing the loudspeaker and filling BASS powder respectively, and the acoustic structure is optimized in cooperation with the canning hole and the protective screen cloth. In addition, due to the design of positioning hole sets, destressing holes, fillets, lightening holes and the like on the metal sheet, the manufacturability and reliability of the product are further improved. According to the invention, the loudspeaker is ultrathin, high in strength, high in reliability and excellent in acoustic performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of loudspeakers, in particular to a micro loudspeaker. BACKGROUND

[0002] With the rapid development of portable electronic devices, such as smart phones, wearable devices and ultra-thin earphones, etc., higher requirements are put forward for the size and performance of internal components. The structural design of micro loudspeakers, as key acoustic components in such devices, directly affects the overall thickness and sound quality performance of the device. Traditional micro loudspeakers usually adopt plastic materials to form an upper shell and a lower shell through injection molding process, and internally accommodate a loudspeaker unit and fill acoustic adjusting materials such as BASS powder to improve low frequency response and acoustic performance.

[0003] In the prior art, in order to meet the demand for light and thin devices, the height direction size of the loudspeaker is usually reduced by reducing the wall thickness of the shell or reducing the size of the internal cavity. However, this simple thinning method is prone to cause insufficient shell structure strength, and deformation or resonance is easy to occur during assembly or use, thereby affecting the stability of acoustic performance. In addition, ordinary plastic shells have poor size stability when subjected to temperature changes or mechanical stress, which can easily cause changes in the shape of the internal cavity, thereby causing acoustic parameter drift, reducing the output performance and reliability of the loudspeaker.

[0004] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the present disclosure and is not intended to be recognized or implied in any form that this information constitutes prior art well known by those skilled in the art. SUMMARY

[0005] The present application provides a micro loudspeaker which can effectively solve the problems in the background art.

[0006] In order to achieve the above purpose, the technical solution adopted by the present application is: A micro loudspeaker, comprising a box body and a loudspeaker and BASS powder arranged therein, the box body comprising an upper shell and a lower shell, the loudspeaker and the BASS powder being arranged in a cavity formed by the upper shell and the lower shell; A first metal sheet is embedded in the upper shell, and a second metal sheet is embedded in the lower shell, the first metal sheet being integrally formed with the upper shell by injection molding, and the second metal sheet being integrally formed with the lower shell by injection molding.

[0007] Further, a first recess and a second recess are respectively arranged on the upper shell and the lower shell, the first recess cooperating with the second recess to form the cavity; The first recess is divided into a first mounting groove and a first filling groove by a first support, and the second recess is divided into a second mounting groove and a second filling groove by a second support.

[0008] Furthermore, both the first bracket and the second bracket are rectangular in shape corresponding to the speaker. The first mounting groove and the second mounting groove form a positioning cavity, and the first filling groove and the second filling groove form a filling cavity. The speaker and the BASS powder are respectively disposed in the positioning cavity and the filling cavity.

[0009] Furthermore, a filling hole is provided on the lower shell, and the filling hole is located in the second filling groove.

[0010] Furthermore, both the first metal sheet and the second metal sheet are made of stainless steel.

[0011] Furthermore, multiple material passage holes are provided on both the first metal sheet and the second metal sheet, and a countersunk structure is provided at one end of the material passage hole, with the end of the countersunk structure being chamfered.

[0012] Furthermore, both the first metal sheet and the second metal sheet are provided with a group of positioning holes. The group of positioning holes includes positioning round holes arranged in a triangular pattern, a first positioning waist hole and a second positioning waist hole, with the first positioning waist hole and the second positioning waist hole being arranged perpendicular to each other in their length directions.

[0013] Furthermore, stress-relieving holes are formed on the first metal sheet. The stress-relieving holes have a U-shaped structure and include multiple irregularly shaped holes with hollowed-out edges and corners. Multiple weight-reducing holes are provided on the second metal sheet. The weight-reducing holes are set in a waist shape and are set at a 45° angle with the edge of the second metal sheet.

[0014] Furthermore, a first folded edge is provided at the edge of the first metal sheet, and the first folded edge is bent toward the lower shell; Multiple slots are provided on the first folded edge, and the total area of ​​the slot outlines is greater than the total area of ​​the first folded edge outlines.

[0015] Furthermore, a second folded edge is provided at the edge of the second metal sheet, the second folded edge is bent toward the upper shell and is set as an L-shaped structure; The outer side of the connecting bend and the structural bend of the second fold is rounded, while the inner side is set as a right angle.

[0016] The beneficial effects of this invention are as follows: In this invention, by using an in-mold injection molded metal sheet structure in the upper and lower shells, the high strength of the metal material is used to compensate for the lack of rigidity caused by the thinning of the plastic shell, effectively preventing shell deformation and resonance, and providing a stable and reliable support structure for acoustic performance. This allows the speaker to achieve a significant reduction in overall thickness while fundamentally ensuring structural strength and durability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the miniature loudspeaker in this invention; Figure 2 This is a cross-sectional schematic diagram of the miniature loudspeaker in this invention; Figure 3 This is a schematic diagram of the explosion of the miniature loudspeaker in this invention; Figure 4 This is a schematic diagram of the upper shell structure in this invention; Figure 5 This is a schematic diagram of the structure of the first metal sheet in this invention; Figure 6 for Figure 5 A schematic diagram of the local structure at point A in the middle; Figure 7 This is a schematic diagram of the structure of the second metal sheet in this invention; Figure 8 This is a schematic diagram of the second folded edge in this invention.

[0019] Reference numerals: 1. Box body; 11. Cavity; 111. Positioning cavity; 112. Filling cavity; 2. Upper shell; 21. First groove; 211. First mounting groove; 212. First filling groove; 22. First bracket; 23. First metal sheet; 231. Stress relief hole; 232. Irregular hole; 233. First folded edge; 234. Slot; 24. Positioning hole group; 241. Positioning round hole; 242. First positioning waist hole; 243. Second positioning waist hole; 3. Lower shell; 31. Second groove; 311. Second mounting groove; 312. Second filling groove; 32. Second bracket; 33. Second metal sheet; 331. Material passage hole; 332. Weight reduction hole; 333. Second folded edge; 34. Canning hole; 4. Horn; 5. Bass powder. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] This invention provides a miniature loudspeaker, such as Figures 1 to 8 As shown, the design aims to achieve an ultra-thin and high-performance device. The speaker includes a housing 1 and a speaker 2 and a bass powder 3 disposed therein. The housing 1 includes an upper shell 2 and a lower shell 3. The speaker 2 and the bass powder 3 are both disposed within the cavity 11 formed by the upper shell 2 and the lower shell 3. A first metal sheet 23 is embedded in the upper shell 2, and a second metal sheet 33 is embedded in the lower shell 3. The first metal sheet 23 is integrally formed with the upper shell 2 by injection molding, and the second metal sheet 33 is integrally formed with the lower shell 3 by injection molding.

[0024] To meet the requirements of the ultra-thin design and ensure the structural strength of the shell, this invention embeds a first metal sheet 23 inside the upper shell 2 and a second metal sheet 33 inside the lower shell 3. The first metal sheet 23 is integrally formed with the upper shell 2 through injection molding, and the second metal sheet 33 is integrally formed with the lower shell 3 through injection molding. By using in-mold insert injection molding, the high strength of the metal material can be effectively utilized to reinforce the plastic shell, which may be weakened due to the reduction in thickness, preventing it from deforming or resonating under stress, thereby providing a stable structural foundation for acoustic performance.

[0025] In practice, after die casting or machining, the surface of the metal sheet will have oil or dirt. If the surface of the metal sheet is oily or too smooth, it will severely weaken its bonding force with the plastic, causing them to easily separate during subsequent use. Therefore, the first metal sheet 23 and the second metal sheet 33 can be pretreated before injection molding, for example, by cleaning with strong alkalis, strong acids, or other chemical reagents, or by using physical methods such as plasma treatment or sandblasting. Pretreatment can effectively remove oil and dirt from the surface of the metal sheet and significantly increase its surface roughness, thereby greatly enhancing the bonding strength between the metal sheet and the plastic after injection molding.

[0026] In this embodiment, as Figures 2 to 4 As shown, a first groove 21 and a second groove 31 are respectively provided on the upper shell 2 and the lower shell 3. The first groove 21 and the second groove 31 form a cavity 11. The first groove 21 is divided into a first mounting groove 211 and a first filling groove 212 by the first bracket 22. The second groove 31 is divided into a second mounting groove 311 and a second filling groove 312 by the second bracket 32.

[0027] See further Figure 7 As shown, the first bracket 22 and the second bracket 32 ​​are both rectangular corresponding to the speaker 2. The first mounting groove 211 and the second mounting groove 311 form a positioning cavity 111. The first filling groove 212 and the second filling groove 312 form a filling cavity 112. The speaker 2 and the BASS powder 3 are respectively placed in the positioning cavity 111 and the filling cavity 112.

[0028] Specifically, the inner side of the upper shell 2 is provided with a first groove 21, and the inner side of the lower shell 3 is provided with a second groove 31. When the upper shell 2 and the lower shell 3 are joined together, the first groove 21 and the second groove 31 cooperate with each other to form a closed cavity 11. In order to optimize the internal space layout of the cavity 11, the shapes of the first bracket 22 and the second bracket 32 ​​are adapted to the shape of the speaker 2 and are set as rectangles. When the upper shell 2 and the lower shell 3 are closed, the first mounting groove 211 and the second mounting groove 311 together form a positioning cavity 111 for precise positioning and installation of the speaker 2; the first filling groove 212 and the second filling groove 312 together form a filling cavity 112 for accommodating the BASS powder 3. The speaker 2 is securely installed in the positioning cavity 111, and the BASS powder 3 is filled in the filling cavity 112. This partitioned cavity 11 design ensures that the speaker 2 and the BASS powder 3 each have their own position and do not interfere with each other, ensuring the stability and consistency of acoustic performance.

[0029] Furthermore, to facilitate the filling of BASS powder 3, a filling hole 34 is provided on the lower shell 3, which is located within the second filling groove 312. In addition, to prevent BASS powder 3 from entering the interior of the speaker 2 during filling or use and causing damage, a 3D mesh can be provided on one side of the speaker 2 corresponding to the filling cavity 112. This mesh fits tightly with the shape of the speaker 2, providing effective isolation and protection.

[0030] In this embodiment, as Figure 5 and Figure 7 As shown, both the first metal sheet 23 and the second metal sheet 33 are made of stainless steel. SUS304½H or SUS304¾H grade stainless steel is typically used, with SUS304½H being a superior choice due to its lower springback during forming, which better ensures molding accuracy. It is important to note that aluminum alloy is not suitable for the metal sheets. This is because, firstly, aluminum alloy has relatively insufficient strength, making it difficult to provide adequate structural reinforcement; secondly, under injection pressures of up to hundreds of tons, aluminum alloy is prone to deformation due to its inherent properties; and more importantly, the shrinkage rate of plastic materials during cooling is much greater than that of aluminum alloy (approximately 7-8 times that of aluminum alloy). This significant difference in shrinkage leads to extremely high internal stress at the bonding interface, causing severe deformation of the aluminum alloy insert and ultimately compromising the integrity of the bond between the metal and the plastic.

[0031] Furthermore, multiple material passage holes 331 are provided on both the first metal sheet 23 and the second metal sheet 33. A countersunk structure is provided at one end of the material passage hole 331, and the end of the countersunk structure is chamfered.

[0032] During injection molding, molten plastic flows into the feed hole 331 and overflows from the other end. After cooling, a plastic structure resembling a rivet head is formed at the feed hole 331, which is anchored within the countersunk structure. This "plastic rivet" effect mechanically locks the metal sheet, significantly improving the strength of the bond between the two.

[0033] To ensure the precise positioning of the metal sheet in the mold and to accommodate its thermal deformation, a positioning hole group 24 is provided on both the first metal sheet 23 and the second metal sheet 33. The positioning hole group 24 includes a positioning circular hole 241 arranged in a triangular pattern, a first positioning waist hole 242 and a second positioning waist hole 243. The first positioning waist hole 242 and the second positioning waist hole 243 are arranged perpendicular to each other in the length direction.

[0034] The positioning circular hole 241 is used to achieve precise initial positioning, while the length directions of the first positioning waist hole 242 and the second positioning waist hole 243 are set perpendicular to each other. The three points determine a plane for basic positioning, the circular hole provides the main positioning, and the two waist-shaped holes with perpendicular directions can effectively absorb the thermal expansion and contraction of the metal sheet caused by temperature changes, avoiding internal stress caused by over-constraint in positioning.

[0035] Furthermore, stress-relieving holes 231 are formed on the first metal sheet 23. The stress-relieving holes 231 have a U-shaped structure and include multiple irregularly shaped holes 232 with rounded corners. As a large-sized flat plate, the first metal sheet 23 can effectively release the internal stress generated during injection molding and cooling, reducing overall warping deformation. See also... Figure 6 As shown, replacing the sharp corners in the stamping holes, including the material passage hole 331 and the positioning hole, with rounded corners can fundamentally prevent sharp corners from appearing on the corresponding punch and die on the stamping die, prevent the sharp corners of the punch from breaking due to stress concentration during stamping, and improve the die life and processing quality.

[0036] Multiple weight-reducing holes 332 are provided on the second metal sheet 33. The weight-reducing holes 332 are designed as waist-shaped holes and are set at a 45° angle with the edge of the second metal sheet 33. This effectively reduces the weight of the component while ensuring structural strength.

[0037] Furthermore, a first folded edge 233 is provided at the edge of the first metal sheet 23, and the first folded edge 233 is bent toward the lower shell 3; a plurality of slots 234 are provided on the first folded edge 233, and the total area of ​​the outline of the slots 234 is greater than the total area of ​​the outline of the first folded edge 233.

[0038] During injection molding, the plastic material fills these slots 234. After cooling, numerous interlocking snap-fit ​​structures are formed between the metal fold and the plastic. Because the metal is hard and the plastic is relatively soft, reducing the proportion of metal and increasing the proportion of plastic in this interlocking structure allows the plastic to more fully encapsulate the metal, thereby greatly promoting the bonding strength.

[0039] See further Figure 8 As shown, a second folded edge 333 is provided at the edge of the second metal sheet 33. The second folded edge 333 is bent toward the upper shell 2 and is set as an L-shaped structure. The outer side of the connecting bend and the structural bend of the second folded edge 333 is a rounded structure, and the inner side is set as a right angle.

[0040] When the inner side of the second fold 333 at the connection bend and the structural bend is rounded, it is easy to cause the "unsealed glue" phenomenon during injection molding, where the plastic cannot be properly sealed or tightly covered. In this embodiment, the inner side is changed to a right angle, which ensures that the plastic material can tightly fill and cover the fold, and obtain a reliable injection molding sealing and bonding effect.

[0041] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A miniature loudspeaker, characterized in that, The device includes a housing and a speaker and bass powder disposed therein. The housing includes an upper shell and a lower shell, and the speaker and the bass powder are both disposed within the cavity formed by the upper shell and the lower shell. A first metal sheet is embedded in the upper shell, and a second metal sheet is embedded in the lower shell. The first metal sheet is integrally formed with the upper shell by injection molding, and the second metal sheet is integrally formed with the lower shell by injection molding.

2. The miniature loudspeaker according to claim 1, characterized in that, A first groove and a second groove are respectively provided on the upper shell and the lower shell, and the first groove and the second groove form the cavity; The first groove is divided into a first mounting groove and a first filling groove by a first bracket, and the second groove is divided into a second mounting groove and a second filling groove by a second bracket.

3. The miniature loudspeaker according to claim 2, characterized in that, Both the first bracket and the second bracket are rectangular in shape corresponding to the speaker. The first mounting groove and the second mounting groove form a positioning cavity, and the first filling groove and the second filling groove form a filling cavity. The speaker and the BASS powder are respectively disposed in the positioning cavity and the filling cavity.

4. The miniature loudspeaker according to claim 3, characterized in that, A filling hole is provided on the lower shell, and the filling hole is located in the second filling groove.

5. The miniature loudspeaker according to claim 1, characterized in that, Both the first metal sheet and the second metal sheet are made of stainless steel.

6. The miniature loudspeaker according to claim 1, characterized in that, Multiple material passage holes are provided on both the first metal sheet and the second metal sheet. A countersunk structure is provided at one end of each material passage hole, and the end of the countersunk structure is chamfered.

7. The miniature loudspeaker according to claim 1, characterized in that, A group of positioning holes is provided on both the first metal sheet and the second metal sheet. The group of positioning holes includes positioning round holes arranged in a triangle, a first positioning waist hole and a second positioning waist hole. The first positioning waist hole and the second positioning waist hole are arranged perpendicular to each other in the length direction.

8. The miniature loudspeaker according to claim 1, characterized in that, Stress-relieving holes are formed on the first metal sheet. The stress-relieving holes have a U-shaped structure and include multiple irregularly shaped holes with hollowed-out edges and corners. Multiple weight-reducing holes are provided on the second metal sheet. The weight-reducing holes are set in a waist shape and are set at a 45° angle with the edge of the second metal sheet.

9. The miniature loudspeaker according to claim 1, characterized in that, A first folded edge is provided at the edge of the first metal sheet, and the first folded edge is bent toward the lower shell; Multiple slots are provided on the first folded edge, and the total area of ​​the slot outlines is greater than the total area of ​​the first folded edge outlines.

10. The miniature loudspeaker according to claim 1, characterized in that, A second folded edge is provided at the edge of the second metal sheet. The second folded edge is bent toward the upper shell and is configured as an L-shaped structure. The outer side of the connecting bend and the structural bend of the second fold is rounded, while the inner side is set as a right angle.

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