Super-bass miniature loudspeaker

Abstract

The invention relates to a super-bass miniature loudspeaker which comprises a magnetic bowl, main magnetic steel, a first auxiliary magnetic steel assembly, a support, a pole piece, a second auxiliary magnetic steel assembly, a voice coil, a dome and a voice diaphragm. The lower surface of the bracket is adhered to the four pieces of first auxiliary magnetic steel; a supporting frame body is embedded in the inner wall of the bracket; flexible circuit boards are arranged at two corners of the inner surface of the bracket; the pole piece is adhered to the upper surface of the main magnetic steel; the second auxiliary magnetic steel assembly comprises four second auxiliary magnetic steels, and the four second auxiliary magnetic steels are bonded in the supporting frame body; the voice diaphragm is adhered to the upper surface of the bracket; the dome is adhered to the lower surface of the voice diaphragm; the upper surface of the voice coil is adhered to the lower surface of the dome, and two wiring ends of the voice coil are electrically connected to the positive electrode connecting end and the negative electrode connecting end of the flexible circuit board respectively. Through the specific structural design, the second auxiliary magnetic steel assembly is introduced, and the sound pressure is increased on the contrary under the condition that the height is limited. And under the condition of ensuring the product height, the product performance is still improved.

Description

TECHNICAL FIELD

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

[0002] A micro loudspeaker is a small electronic component widely used in mobile devices, earphones and sound equipment. It can convert electrical signals into air vibrations to produce sound. Due to its small size, low power consumption and good sound quality, it is very popular in the market. The diameter of a micro loudspeaker is usually less than 20 mm, and the height is less than 10 mm, with a certain sound producing capacity. It is usually composed of a diaphragm, a magnet, a wire, etc. After receiving external electrical signals, the diaphragm is affected by the magnetic field and vibrates to produce sound. There are many types of micro loudspeakers on the market, such as 28mm inner magnetic horn loudspeakers and cavity horns supplied directly by manufacturers, which play an important role in different application scenarios.

[0003] In electronic consumer products, the research and development direction is increasingly towards ultra-thin products, while the performance of micro loudspeakers is becoming increasingly demanding. Currently, the common approach is to reduce the thickness of each component of the micro loudspeaker, which has a certain impact on the performance of the loudspeaker.

[0004] Therefore, it is necessary to provide a micro loudspeaker with super low sound to solve the above technical problems. SUMMARY

[0005] The purpose of the present application is to provide a micro loudspeaker with super low sound, which introduces a second auxiliary magnetic steel assembly through specific structural design, and the sound pressure is improved under the condition of limited height. It ensures that the product height is still improved under the condition of product performance.

[0006] To achieve the above-mentioned purpose of the application, a micro loudspeaker with super low sound is provided, which comprises a magnetic bowl, a main magnetic steel, a first auxiliary magnetic steel assembly, a support, a pole piece, a second auxiliary magnetic steel assembly, a voice coil, a ball top and a sound film.

[0007] The first auxiliary magnetic steel assembly comprises four first auxiliary magnetic steels, which are bonded around the inner wall of the magnetic bowl; the main magnetic steel is bonded at the middle position of the inner wall of the magnetic bowl, and the four first auxiliary magnetic steels are spaced around the main magnetic steel;

[0008] The support is a frame structure; the lower surface of the support is bonded on the four first auxiliary magnetic steels; a support frame is embedded on the inner wall of the support, and the material of the support frame is magnetic conductive material;

[0009] Two corner positions of the inner surface of the support are provided with flexible circuit boards for connecting external power supply;

[0010] The pole piece is bonded on the upper surface of the main magnetic steel.

[0011] The second sub-magnetic steel assembly comprises four second sub-magnetic steels, which are bonded in the support frame and distributed around the inner wall of the support frame.

[0012] The sound film is bonded to the upper surface of the support frame.

[0013] The ball top is bonded to the lower surface of the sound film.

[0014] The upper surface of the voice coil is bonded to the lower surface of the ball top, and the two wire ends of the voice coil are respectively electrically connected to the positive and negative connection ends of the flexible circuit board.

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

[0016] Preferably, the inner surface of the support frame is provided with two spare flexible circuit boards at other two corner positions.

[0017] Preferably, the front and rear side edges of the magnetic bowl are provided with limiting protruding plates near the corner positions, the height of the limiting protruding plate is matched with the thickness of the first sub-magnetic steel; the front and rear side edges of the support frame are extended downward to form extension plates, the extension plates correspond to the limiting protruding plates one by one, and the positions of the extension plates on the support frame are matched with the limiting protruding plates.

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

[0019] Preferably, the bending area of the sound film is uniformly provided with a plurality of protrusions.

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

[0021] Compared with the prior art, the micro loudspeaker of the present application has the following advantages:

[0022] (1) In the case of reducing the thickness of the entire micro loudspeaker, the magnetic circuit system is redesigned, the sub-magnetic steel of the Hua Si is introduced, and the product Bl is increased. In the case of height limitation, the sound pressure is improved by 2dB. It is ensured that the product height is still improved in the case of product performance, the applicability is wide, and the product sound quality is unchanged;

[0023] (2) Simple structure, convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an exploded view of the micro loudspeaker of the present application;

[0025] Figure 2Structure diagram of a subwoofer micro speaker in the embodiment;

[0026] Figure 3 Structure diagram of a magnetic bowl in the embodiment

[0027] Figure 4 Sectional view of a support in the embodiment;

[0028] Figure 5 Structure diagram of a pole piece in the embodiment;

[0029] Figure 6 Sectional view of a subwoofer micro speaker in the embodiment. DETAILED DESCRIPTION

[0030] The application is further described below in combination with the drawings and specific embodiments.

[0031] In the embodiment, Figure 1 The sound membrane is not shown in the exploded view of the subwoofer micro speaker in the embodiment due to its transparent state.

[0032] As shown in Figure 1 and Figure 2 , the subwoofer micro speaker comprises a magnetic bowl 1, a main magnetic steel 2, a first auxiliary magnetic steel assembly, a support 3, a pole piece 4, a second auxiliary magnetic steel assembly, a voice coil 5, a ball top 6, and a sound membrane 7.

[0033] The first auxiliary magnetic steel assembly comprises four first auxiliary magnetic steels 8, which are bonded around the inner wall of the magnetic bowl 1; the main magnetic steel 2 is bonded at the middle position of the inner wall of the magnetic bowl 1, and the periphery of the main magnetic steel 2 is spaced apart from the four first auxiliary magnetic steels 8.

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

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

[0036] The inner surface of the support 3 is provided with a flexible circuit board 10 at two corner positions, which is used to connect an external power supply to realize conduction.

[0037] In the embodiment, the inner surface of the support 3 is provided with a standby flexible circuit board 11 at the other two corner positions, which plays a role of standby on the one hand and makes the support 3 in a balanced state on the other hand.

[0038] In the embodiment, as shown in Figure 3As shown, the front and rear edges of the magnetic bowl 1 are provided with limiting protrusions 12 near the corners, the height of the limiting protrusions 12 is adapted to the thickness of the first auxiliary magnetic steel 8. Figure 4 As shown, the front and rear edges of the support frame 3 are provided with extension plates 13 extending downward, the extension plates 13 correspond to the limiting protrusions 12, and the positions of the extension plates 13 on the support frame 3 are adapted to the limiting protrusions 12; in this way, when the support frame 3 is attached to the four first auxiliary magnetic steels 8, the side surface of the limiting protrusions 12 is in contact with the side surface of the extension plates 13, thereby playing a guiding role; when the lower surface of the support frame 3 is in contact with the lower surface of the extension plates 13, at this time, the upper surface of the four first auxiliary magnetic steels 8 is just bonded to the lower surface of the support frame 3, thereby achieving the effect of quick positioning and installation.

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

[0040] The second auxiliary magnetic steel assembly includes four second auxiliary magnetic steels 14, the four second auxiliary magnetic steels 14 are bonded in the support frame 9, and are distributed around the inner wall of the support frame 9.

[0041] According to the principle of electromagnetic induction, when the voice coil is connected to audio current, it will be subjected to Ampere force (driving force) in the magnetic field of the magnetic gap, the formula is F = BIL (B is the magnetic field strength, I is the current, and L is the effective length of the voice coil). A stronger magnetic field (B is larger) will directly increase the driving force F. The driving force determines the vibration amplitude of the diaphragm: a larger driving force can push the diaphragm to vibrate with a larger amplitude, and the larger the vibration amplitude of the diaphragm, the stronger the compression / stretching degree of the surrounding air, and the higher the sound energy (sound pressure) ultimately radiated. The driving force determines the vibration amplitude of the diaphragm: a larger driving force can push the diaphragm to vibrate with a larger amplitude, and the larger the vibration amplitude of the diaphragm, the stronger the compression / stretching degree of the surrounding air, and the higher the sound energy (sound pressure) ultimately radiated.

[0042] The diaphragm 7 is bonded to the upper surface of the support frame 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 wire ends of the voice coil 5 are respectively electrically connected to the positive and negative connection ends of the flexible circuit board 10.

[0045] In this embodiment, the bottom of the voice coil 5 is bonded to two flexible circuit boards 10 and two backup flexible circuit boards 11, thereby achieving effective positioning and installation.

[0046] In the embodiment, the bending areas of the diaphragm 7 are uniformly provided with protrusions (not shown in the figure) to effectively improve the strength of the bending areas of the diaphragm.

[0047] In the embodiment, as shown in Figure 5 the upper surface edge of the pole piece 4 is recessed downward to form an avoiding area 15. When the glue at the connecting position between the voice coil 5 and the diaphragm 7 overflows and flows downward to solidify, the solidified glue will not collide with the pole piece 4 when the voice coil 5 vibrates up and down, so as to avoid the generation of noise and affect the quality of sound.

[0048] As shown in Figure 6 when the audio current passes through the voice coil, the conductor will be subjected to force in the magnetic field according to Ampere's law. Since the voice coil 5 is in the magnetic field of the permanent magnet, the voice coil 5 will be subjected to a force related to the size and direction of the current. The audio current is an alternating current that changes with time, so the size and direction of the force acting on the voice coil 5 will also change with time. Under the action of the force, the voice coil 5 will make reciprocating motion in the magnetic field of the permanent magnet. The motion of the voice coil 7 is transmitted to the diaphragm through the ball top, so that the diaphragm 7 also makes reciprocating vibration. The vibration of the diaphragm 7 will cause the surrounding air to vibrate, thereby generating sound waves, so that we can hear the sound. Different frequency and amplitude of the audio current will make the voice coil produce different frequency and amplitude of vibration, so that the product can withstand higher power, and then the diaphragm emits sound of different pitch and loudness, so as to realize the conversion of electrical signal to sound signal.

[0049] The preferred embodiments of the application have been specifically described above, but the application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present 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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