A subwoofer micro speaker

Abstract

The utility model relates to a kind of ultra-low micro loudspeaker, including magnetic bowl, main magnetic steel, first deputy magnetic steel component, support, pole piece, second deputy magnetic steel component, voice coil, ball top and sound film;The lower surface of support is bonded on four first deputy magnetic steels;Support inner wall is embedded with support frame body;Two corner positions of the inner surface of support are each equipped with flexible circuit board;Pole piece is bonded on the upper surface of main magnetic steel;Second deputy magnetic steel component includes four second deputy magnetic steels, four second deputy magnetic steels are bonded in support frame body;Sound film is bonded on the upper surface of support;Ball top is bonded on the lower surface of sound film;The upper surface of voice coil is bonded on the lower surface of ball top, and two wiring ends of voice coil are respectively electrically connected on the positive electrode connecting end and negative electrode connecting end of flexible circuit board.The utility model is imported second deputy magnetic steel component by specific structure design, in the case of height limitation, sound pressure is improved instead.Guarantee the product height condition, still improve product performance.

Description

Technical Field

[0001] This utility model relates to the field of loudspeaker technology, and in particular to a miniature subwoofer. Background Technology

[0002] Miniature loudspeakers are miniaturized electronic components widely used in mobile devices, headphones, and audio equipment. They convert electrical signals into air vibrations to produce sound. Due to their small size, low power consumption, and good sound quality, they are very popular in the market. Miniature loudspeakers are typically less than 20 mm in diameter and less than 10 mm in height, possessing a certain sound-producing capability. They are usually composed of a diaphragm, magnet, and wires. Upon receiving an external electrical signal, the diaphragm vibrates under the influence of a magnetic field, thus producing sound. Various types of miniature loudspeakers are available on the market, such as 28mm internal magnet loudspeakers and cavity loudspeakers supplied directly by manufacturers, playing important roles in different application scenarios.

[0003] In the field of consumer electronics, research and development is increasingly focused on ultra-thin products, while the performance requirements for miniature speakers are becoming increasingly stringent. Currently, the common practice is to reduce the thickness of the various components of miniature speakers, which has a certain impact on the performance of the speakers.

[0004] Therefore, there is a need to provide a miniature subwoofer to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a miniature subwoofer speaker that, through a specific structural design and the introduction of a second magnet assembly, achieves increased sound pressure level despite height limitations. This improves product performance while maintaining a reasonable product height.

[0006] To achieve the above-mentioned purpose of the utility model, a miniature subwoofer is provided, including a magnetic cup, a main magnet, a first auxiliary magnet assembly, a bracket, pole pieces, a second auxiliary magnet assembly, a voice coil, a dome, and a diaphragm;

[0007] The first auxiliary magnet assembly includes four first auxiliary magnets, which are bonded to the inner wall of the magnetic bowl around the perimeter; the main magnet is bonded to the middle of the inner wall of the magnetic bowl, and a gap is left between the main magnet and the four first auxiliary magnets around the perimeter.

[0008] The bracket is a frame structure; the lower surface of the bracket is bonded to four first-stage magnets; a support frame is embedded in the inner wall of the bracket, and the support frame is made of magnetically conductive material;

[0009] Flexible circuit boards are provided at both corners of the inner surface of the bracket for connecting to an external power source.

[0010] The pole piece is bonded to the upper surface of the main magnet.

[0011] The second auxiliary magnet assembly includes four second auxiliary magnets, which are bonded to the support frame and distributed around the inner wall of the support frame.

[0012] The diaphragm is bonded to the upper surface of the bracket;

[0013] The dome is bonded to the lower surface of the diaphragm;

[0014] The upper surface of the voice coil is bonded to the lower surface of the dome, and the two terminals of the voice coil are electrically connected to the positive and negative terminals of the flexible circuit board, respectively.

[0015] Specifically, the support frame is embedded in the inner wall of the bracket by injection molding.

[0016] Preferably, spare flexible circuit boards are provided at the other two corners of the inner surface of the bracket.

[0017] Preferably, the front and rear edges of the magnetic bowl have limiting protrusions near their corners, and the height of the limiting protrusions is adapted to the thickness of the first pair of magnets; the front and rear edges of the bracket extend downward to form extension plates, and the extension plates correspond one-to-one with the limiting protrusions, and the position of the extension plates on the bracket is adapted to the limiting protrusions.

[0018] Preferably, the bottom of the voice coil is bonded to two flexible circuit boards and two spare flexible circuit boards.

[0019] Preferably, the bending area of ​​the diaphragm is provided with a plurality of protrusions evenly distributed.

[0020] Preferably, the upper surface edge of the electrode is recessed downward to form a clearance area.

[0021] The advantages of this miniature subwoofer compared to existing technologies are as follows:

[0022] (1) By reducing the overall thickness of the miniature loudspeaker, the sound pressure level was increased by 2dB under height constraints by redesigning the magnetic circuit system, introducing a washer auxiliary magnet, and increasing the product's BL. This improved product performance and broadened its applicability while maintaining the same sound quality, all while ensuring the product's height.

[0023] (2) Simple structure and easy to use. Attached Figure Description

[0024] Figure 1 This is an exploded view of a miniature subwoofer according to this embodiment;

[0025] Figure 2 This is a schematic diagram of the structure of a miniature subwoofer according to this embodiment;

[0026] Figure 3 This is a schematic diagram of the magnetic bowl structure in this embodiment.

[0027] Figure 4 This is a cross-sectional view of the bracket in this embodiment;

[0028] Figure 5 This is a schematic diagram of the electrode structure in this embodiment;

[0029] Figure 6 This is a cross-sectional view of a miniature subwoofer according to this embodiment. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] In this embodiment, Figure 1 The diaphragm is not shown in the exploded view due to its transparent state.

[0032] like Figure 1 and Figure 2 As shown, a miniature subwoofer of this utility model includes a magnetic cup 1, a main magnet 2, a first auxiliary magnet assembly, a bracket 3, a pole piece 4, a second auxiliary magnet assembly, a voice coil 5, a dome 6, and a diaphragm 7.

[0033] The first auxiliary magnet assembly includes four first auxiliary magnets 8, which are bonded to the inner wall of the magnetic bowl 1. The main magnet 2 is bonded to the middle of the inner wall of the magnetic bowl 1, and there is a gap between the main magnet 2 and the four first auxiliary magnets 8.

[0034] The bracket 3 is a frame structure; the lower surface of the bracket 3 is bonded to four first auxiliary magnets 8; a support frame 9 is embedded in the inner wall of the bracket 3, and the support frame 9 is made of magnetically conductive material.

[0035] In this embodiment, the support frame 9 is embedded in the inner wall of the bracket 3 by injection molding.

[0036] Flexible circuit boards 10 are provided at both corners of the inner surface of the bracket 3 for connecting to an external power source to achieve conductivity.

[0037] In this embodiment, spare flexible circuit boards 11 are provided at the other two corners on the inner surface of the bracket 3. On the one hand, this keeps the bracket 3 in a balanced state, and on the other hand, the spare flexible circuit boards 11 serve as backups.

[0038] In this embodiment, as Figure 3As shown, the front and rear edges of the magnetic bowl 1 have limiting protrusions 12 near their corners. The height of the limiting protrusions 12 is adapted to the thickness of the first set of magnets 8. Figure 4 As shown, the front and rear edges of the bracket 3 extend downward to form extension plates 13. The extension plates 13 correspond one-to-one with the limiting protrusions 12, and the position of the extension plates 13 on the bracket 3 is adapted to the limiting protrusions 12. With this arrangement, when the bracket 3 is attached to the four first set of magnets 8, the side of the limiting protrusions 12 contacts the side of the extension plates 13, which plays a guiding role. When the lower surface of the bracket 3 contacts the lower surface of the extension plates 13, the upper surface of the four first set of magnets 8 is just bonded to the lower surface of the bracket 3, realizing the function of quick positioning and installation.

[0039] The pole piece 4 is bonded to the upper surface of the main magnet 2.

[0040] The second auxiliary magnet assembly includes four second auxiliary magnets 14, which are bonded to the support frame 9 and distributed around the inner wall of the support frame 9.

[0041] By installing a second magnet assembly on the support frame 9 of bracket 3, according to the principle of electromagnetic induction, when an audio current is passed through the voice coil, it will experience an Ampere force (driving force) in the magnetic field of the magnetic gap, as expressed by the formula F = BIL (where B is the magnetic field strength, I is the current, and L is the effective length of the voice coil). A stronger magnetic field (a larger B) will directly increase the driving force F. The driving force determines the diaphragm vibration amplitude: a larger driving force can drive the diaphragm to vibrate with a larger amplitude, and the larger the diaphragm vibration amplitude, the stronger the compression / stretching of the surrounding air, and the higher the sound energy (sound pressure) radiated.

[0042] The diaphragm 7 is bonded to the upper surface of the bracket 3.

[0043] The dome 6 is bonded to the lower surface of the diaphragm 7.

[0044] The upper surface of the voice coil 5 is bonded to the lower surface of the dome 6, and the two terminals of the voice coil 5 are electrically connected to the positive terminal and the negative terminal of the flexible circuit board 10, respectively.

[0045] In this embodiment, the bottom of the voice coil 5 is bonded to two flexible circuit boards 10 and two spare flexible circuit boards 11 respectively, so as to achieve effective positioning and installation.

[0046] In this embodiment, the bending area of ​​the diaphragm 7 is uniformly provided with several protrusions (not shown in the figure), which effectively improves the strength of the bending area of ​​the diaphragm.

[0047] In this embodiment, as Figure 5 As shown, the upper surface edge of the electrode 4 is recessed downward to form a clearance area 15. When the glue at the connection between the voice coil 5 and the diaphragm 7 overflows and flows downward to solidify, when the voice coil 5 vibrates up and down, it prevents the solidified glue from colliding with the electrode 4, generating noise, and affecting the sound quality.

[0048] like Figure 6 As shown, when an audio current passes through the voice coil, according to Ampere's law, a current-carrying conductor in a magnetic field experiences a force. Since the voice coil 5 is located in the magnetic field of the permanent magnet, it experiences a force related to the magnitude and direction of the current. The audio current is an alternating current that changes with time, so the magnitude and direction of the force on the voice coil 5 also change over time. Under this force, the voice coil 5 reciprocates within the magnetic field of the permanent magnet. The movement of the voice coil 7 is transmitted to the diaphragm through the dome, causing the diaphragm 7 to also reciprocate. The vibration of the diaphragm 7 causes the surrounding air to vibrate, thus generating sound waves, which we can hear. Audio currents of different frequencies and amplitudes cause the voice coil to vibrate at different frequencies and amplitudes, allowing the product to withstand higher power, and consequently, enabling the diaphragm to emit sounds of different pitches and loudnesses. This achieves the conversion of electrical signals into sound signals.

[0049] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A miniature subwoofer, characterized in that, It includes a magnetic cup, main magnet, first auxiliary magnet assembly, bracket, pole piece, second auxiliary magnet assembly, voice coil, dome and diaphragm; The first auxiliary magnet assembly includes four first auxiliary magnets, which are bonded to the inner wall of the magnetic bowl around the perimeter; the main magnet is bonded to the middle of the inner wall of the magnetic bowl, and a gap is left between the main magnet and the four first auxiliary magnets around the perimeter. The bracket is a frame structure; the lower surface of the bracket is bonded to four first-stage magnets; a support frame is embedded in the inner wall of the bracket, and the support frame is made of magnetically conductive material; Flexible circuit boards are provided at both corners of the inner surface of the bracket for connecting to an external power source. The pole pieces are bonded to the upper surface of the main magnet; The second auxiliary magnet assembly includes four second auxiliary magnets, which are bonded to the support frame and distributed around the inner wall of the support frame. The diaphragm is bonded to the upper surface of the bracket; The dome is bonded to the lower surface of the diaphragm; The upper surface of the voice coil is bonded to the lower surface of the dome, and the two terminals of the voice coil are electrically connected to the positive and negative terminals of the flexible circuit board, respectively.

2. A miniature subwoofer as described in claim 1, characterized in that, The support frame is embedded in the inner wall of the bracket by injection molding.

3. A miniature subwoofer as described in claim 1, characterized in that, Spare flexible circuit boards are provided at the other two corners of the inner surface of the bracket.

4. A miniature subwoofer as described in any one of claims 1 to 3, characterized in that, The magnetic bowl has limiting protrusions on its front and rear sides near its corners. The height of the limiting protrusions is adapted to the thickness of the first pair of magnets. The front and rear sides of the bracket extend downward to form extension plates. The extension plates correspond one-to-one with the limiting protrusions, and the position of the extension plates on the bracket is adapted to the limiting protrusions.

5. A miniature subwoofer as described in claim 3, characterized in that, The bottom of the voice coil is bonded to two flexible circuit boards and two spare flexible circuit boards, respectively.

6. A miniature subwoofer as described in claim 1, characterized in that, The diaphragm has several protrusions evenly distributed in its bending area.

7. A miniature subwoofer as described in claim 1, characterized in that, The upper surface edge of the electrode is recessed downward to form a clearance zone.

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