Loudspeaker

Abstract

The utility model relates to a loudspeaker, which belongs to the technical field of loudspeakers and comprises magnetic steel, a diaphragm assembly, an FPC (flexible printed circuit), a voice coil, a support for fixing the diaphragm assembly and the magnetic steel, an upper shell and a lower shell, pole pieces are respectively arranged on the outer walls of two sides of the support, supporting parts are respectively arranged inside two sides of the support, and the magnetic steel is uniformly arranged at the upper parts and the lower parts of the supporting parts. A gap is formed between the two supporting parts, the voice coil is arranged in the gap, the voice coil is composed of two voice coil layers, and the two ends of the voice coil are respectively and reversely folded to the side surfaces of the magnetic steel. The structure is compact and small, a bidirectional magnetic field in a magnetic circuit and a uniform magnetic field directly provided by the magnetic steel are fully utilized, and the voice coil is driven by sufficient and uniform magnetic field intensity; the circuit board structure design of the voice coil overcomes the defects of a traditional voice coil wound by an enameled wire, has the advantages of various structures, foldability and difficulty in damage, and can fully utilize a magnetic field.

Description

Technical Field

[0001] The utility model relates to a loudspeaker, belongs to the technical field of loudspeakers, and is widely used in sound-generating electronic products such as Bluetooth headsets, smart glasses, and mobile phones. Background Art

[0002] With the market demand, the size and volume of sound-generating electronic products such as Bluetooth headsets, smart glasses, and mobile phones are constantly decreasing and becoming thinner and lighter. This requires that the size and volume of the speakers also need to be reduced accordingly. The reduction in the size of the speakers will also lead to a decrease in the loudness of the speakers. Therefore, there needs to be sufficient loudness when the speaker volume is reduced.

[0003] A small volume and high loudness solution is now available in the market. Its structure is a longitudinal flat voice coil assembled in the magnetic circuit, using the magnetic field distribution of the magnetic circuit and designing a balanced vibration system. However, this design is also restricted by the voice coil, specifically:

[0004] The current voice coil production method is to use a winding machine to wind the enameled wire, and then go through processes such as melting glue, stretching, and shaping. In order to ensure the high precision of the voice coil, it is necessary to import expensive winding machines from Japan. Usually, an automatic production line requires about 6 winding machines, and the total price is about 3.6 million RMB.

[0005] At the same time, the selection of wires is also very important. Poor wires have problems such as uneven wire diameter, pores in the glue layer, low tensile strength, and a large fluctuation range of resistance. Often, only imported wires can be selected, which undoubtedly increases the overall cost.

[0006] The wound voice coil is also easy to deform and damage, and it is often unable to meet the requirements for some complex structures and small sizes. Even if it can be done, it will require huge costs.

[0007] Traditional flat voice coils cannot fully utilize the magnetic field distribution of the magnetic circuit, resulting in waste of performance or space.

[0008] In order to achieve sufficient loudness while reducing the size of the speaker, the following patent CN116033318 A "Loudspeaker and Electronic Equipment" uses an enameled wire-wound flat voice coil placed in the magnetic gap, and the two opposite sides of the voice coil are connected to a diaphragm structure. This patent design has the following two main advantages:

[0009] 1. Improve the overall vibration stiffness of the vibration component and ensure the overall vibration stability of the vibration component.

[0010] 2. Under the condition of the same effective radiation area, the speaker with voice coil-dual diaphragm design can achieve a larger amplitude and higher loudness on the basis of miniaturization.

[0011] However, this invention design has the following three disadvantages:

[0012] 1. The manufacturing and assembly of the flat voice coil to the speaker are complex, and the assembly yield rate is low, greatly increasing its cost.

[0013] 2. The structural strength of the voice coil is low, and it is prone to bending under force during vibration, affecting the basic performance of the speaker.

[0014] 3. The current direction of the short side of the voice coil is the up-and-down longitudinal direction, and the force direction in the magnetic field is the left-and-right transverse direction, while the diaphragm vibrates and emits sound in the up-and-down longitudinal direction. Therefore, the short side of the voice coil is wasted in the magnetic field, and the magnetic field of the speaker cannot be fully utilized. At the same time, restricted by the single structure of the traditional voice coil, the structure cannot be diversified, and the applicable scenarios are few.

[0015] Therefore, it is necessary to design a voice coil that can reduce costs while having high precision, high consistency, stable structure, and not easily damaged. It can be made into various complex structures to be applicable to various different application solutions and scenarios. While the product is made thinner and lighter, it can also take into account excellent acoustic performance. Summary of the Invention

[0016] The purpose of the present utility model is to overcome the deficiencies of the above-mentioned traditional technologies and provide a speaker with a compact and small structure, which makes full use of the bidirectional magnetic field in the magnetic circuit and the uniform magnetic field directly provided by the magnet. There is sufficient uniform magnetic field intensity to drive the voice coil; the circuit board structure design of the voice coil eliminates the drawbacks of the traditional enameled wire wound voice coil, has the advantages of diverse structures, foldable, and not easily damaged, and can make more full use of the magnetic field.

[0017] The purpose of the present utility model is achieved by the following technical measures: A speaker, including a magnet, a diaphragm assembly, an FPC, a voice coil, a bracket for fixing the diaphragm assembly and the magnet, an upper shell and a lower shell. Pole pieces are respectively provided on the outer walls on both sides of the bracket, and support parts are respectively provided inside the two sides of the bracket. The magnet is uniformly arranged on the upper and lower parts of the support part, and there is a gap between the two support parts. The voice coil is arranged in the gap, and the voice coil is composed of two layers of voice coil layers. The two ends of the voice coil are respectively folded back to the sides of the magnet.

[0018] As a further improvement of the above technical solution:

[0019] The voice coil is in the shape of a "work" character.

[0020] The magnet is bonded to the bracket, the diaphragm assembly is bonded to the bracket, the FPC is bonded to the lower end of the bracket, one end of the voice coil is bonded to the FPC, the connection pin of the voice coil is welded to the FPC, and the other end of the voice coil is inserted into the bracket and bonded to the diaphragm assembly.

[0021] The voice coil layer comprises a base layer, conductor wires and glue. The conductor wires are evenly spaced on both sides of the base layer, and the glue is arranged in the gaps between the conductor wires.

[0022] The conductor wire is made of a conductive material selected from the group consisting of Cu, Ag, Al, and alloys, with a thickness of 0.06 to 0.2 mm and a density of 6.7 to 10.5 mg / mm³.

[0023] The base layer is a lightweight hard material such as PI, PET, or a polymer material, with a thickness of 0.012 to 0.03 mm and a density of 1.1 to 1.2 mg / mm³.

[0024] A connecting pad is provided in the middle of the two voice coil layers.

[0025] The two voice coil layers are bonded together using heat-resistant glue.

[0026] The upper shell is arranged at the upper end of the bracket, the lower shell is arranged at the lower end of the bracket, and the upper shell is provided with a sound outlet.

[0027] The voice coil is in a zigzag shape.

[0028] Due to the adoption of the above technical solution, compared with the prior art, the advantages of the utility model are: the utility model has a compact structure, makes full use of the bidirectional magnetic field in the magnetic circuit and the uniform magnetic field directly provided by the magnetic steel, and has sufficient uniform magnetic field strength to drive the voice coil; the circuit board structure design of the voice coil eliminates the disadvantages of the traditional enameled wire winding voice coil, has the advantages of diverse structures, foldable, and not easy to damage, and can make more full use of the magnetic field. It can be used for the sound of narrow structure products, such as the glasses legs of smart glasses, reading pens, smart translation pens, etc., and can also be used as a tweeter unit and placed in products such as headphones.

[0029] The voice coil in the utility model has a high yield and low cost. The voice coil line is formed by etching or photolithography, with high precision and diverse line layout designs. At the same time, its double-layer structure is simple, the thickness is small, and the structure is stable and not easy to damage.

[0030] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of a speaker in an embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of the exploded structure of a speaker in an embodiment of the utility model;

[0033] Figure 3 This is a schematic cross-sectional view of a loudspeaker in an embodiment of the utility model;

[0034] Figure 4 This is a schematic diagram of the structure of the voice coil in the embodiment of the utility model when it is not folded;

[0035] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the AA direction;

[0036] Figure 6 It is a schematic diagram of the three-dimensional structure of the voice coil and the magnetic steel in the embodiment of the utility model;

[0037] Figure 7 This is a schematic diagram of the structure of the voice coil in the embodiment of the utility model;

[0038] Figure 8 It is a schematic structural diagram of a zigzag voice coil in an embodiment of the utility model.

[0039] In the figure, 1-magnetic steel, 2-diaphragm assembly, 3-FPC, 4-voice coil, 5-bracket, 6-upper shell, 7-lower shell, 8-pole piece, 9-support part, 10-base layer, 11-conductor wire, 12-connecting pad, 13-glue. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined. Example

[0043] like Figure 1-7 As shown, a loudspeaker comprises a magnetic steel 1, a diaphragm assembly 2, an FPC 3, a voice coil 4, a bracket 5 for fixing the diaphragm assembly 2 and the magnetic steel 1, an upper shell 6 and a lower shell 7, pole pieces 8 are respectively provided on the outer walls on both sides of the bracket 5, support parts 9 are respectively provided inside the two sides of the bracket 5, the magnetic steel 1 is evenly arranged at the upper and lower parts of the support parts 9, the magnetic steel 1 is bonded to the bracket 5, a gap is provided between the two support parts 9, the voice coil 4 is arranged in the gap, the voice coil 4 is composed of two layers of voice coil layers, the two ends of the voice coil 4 are respectively folded back to the side of the magnetic steel, so that the voice coil forms an "I" shape, the diaphragm assembly 2 is bonded to the bracket 5, the FPC 3 is bonded to the lower end of the bracket 5, one end of the voice coil 4 is bonded to the FPC 3, the voice coil 4 connecting pin is welded to the FPC 3, the other end of the voice coil 4 is inserted into the bracket 5 and bonded to the diaphragm assembly 2; the upper shell 6 is arranged at the upper end of the bracket 5, and the lower shell 7 is arranged at the lower end of the bracket 5.

[0044] The diaphragm assembly 2 and FPC 3 work together to form a double suspension system; the magnet 1 is bonded to the bracket 5, and the magnetic circuit is a four-magnet design structure with upper and lower magnetic circuits to provide a magnetic field; the voice coil 4 is a circuit board type, assembled into the magnetic gap, and powered on to drive the diaphragm assembly 2 to vibrate and make sound; the upper shell 6 and the lower shell 7 play a protective role, and at the same time, a sound outlet is provided on the upper shell 6, and the sound is emitted from the sound outlet.

[0045] The voice coil 4 is an integrated circuit board formed by etching or photolithography. The voice coil 4 is composed of two voice coil layers, each of which includes a base layer 10, a conductor wire 11 and glue 13. The conductor wires 11 are evenly spaced on both sides of the base layer 10, and the glue 13 is arranged in the gap between the conductor wires 11. The material of the conductor wire 11 is a conductive material such as Cu, Ag, Al, and an alloy, with a thickness of 0.06~0.2mm and a density of 6.7~10.5 mg / mm³. The base layer 10 is a lightweight hard material such as PI, PET, and a polymer material, with a thickness of 0.012~0.03mm and a density of 1.1~1.2mg / mm³.

[0046] The conductor wire 11 of the voice coil 4 can be arranged in a variety of arrangements such as a ring or horizontal and vertical arrangement. In the present embodiment, it is a runway-type ring arrangement. The density of the conductor wire 11 is greater than the density of the base layer 10 and the glue. It is best that the conductor wire 11 accounts for more than 85% of the total mass of the voice coil 4. The higher the density of the conductor wire 11, the higher its mass share, and the lower the resistivity, which can provide a higher driving force in the magnetic field.

[0047] A connecting pad 12 is provided in the middle of the two voice coil layers, which are connected by electroplating. The two voice coil layers are bonded with heat-resistant glue, and are connected by electroplating, spot coating of conductive materials, brushing of conductive silver paste, etc. The short side of the voice coil, that is, the ineffective magnetic field part, is not coated with glue when making the voice coil, but glue is applied in the middle of the long side of the voice coil, and the middle of the long side is bonded together, and the ineffective magnetic field part of the voice coil is folded back to the side of the magnetic steel, leaving a vibration safety spacing of 0.11~0.2mm. The number of voice coil layers can also be multiple layers, preferably an even number of layers, to match the required resistance value, wire length, voice coil quality, and size.

[0048] Magnetic field analysis: The magnetic circuit is a four-magnetic steel structure, divided into an upper and lower magnetic circuit. The upper and lower magnetic circuits each contain two left and right magnets. The magnetic field directions of these two magnets are consistent, and the magnetic field distribution is in the left and right directions. The upper and lower magnetic fields are relative, and the outer side of the magnetic circuit is a pole piece 8. Pole piece 8 can use magnetic conductive materials such as SPCC to guide and converge magnetic flux lines and enhance the magnetic field strength at the voice coil position. The entire magnetic circuit constitutes an internal loop and is concentrated in the magnetic field gap.

[0049] The upper and lower parts of the voice coil are both subject to an upward electromagnetic force; when the direction of the voice coil current changes to the opposite direction, the voice coil is subject to a downward electromagnetic force; therefore, the voice coil vibrates up and down after the AC signal is connected, thereby driving the diaphragm to make a sound, and the bidirectional magnetic field of the magnetic circuit plays an electromagnetic driving role in the vibration of the voice coil, thereby improving the utilization rate of the magnetic field and having a more uniform magnetic field distribution; at the same time, the upper and lower parts of the voice coil are in magnetic fields in opposite directions, which can balance and reduce the nonlinearity of the magnetic field on the voice coil, helping to reduce speaker distortion.

[0050] like Figure 8 As shown, the voice coil 4 can also be in a zigzag shape. This structure can also save space inside the speaker and improve the high-frequency performance of the speaker. However, this folded structure will cause a slight mass asymmetry, which is not conducive to the balanced vibration of the speaker. Therefore, other mass blocks need to be stacked to balance the mass.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A loudspeaker, characterized in that: The invention comprises a magnetic steel (1), a diaphragm assembly (2), an FPC (3), a voice coil (4), a bracket (5) for fixing the diaphragm assembly (2) and the magnetic steel (1), an upper shell (6) and a lower shell (7), wherein pole pieces (8) are respectively arranged on the outer walls on both sides of the bracket (5), and support parts (9) are respectively arranged inside the two sides of the bracket (5), the magnetic steel (1) is evenly arranged on the upper and lower parts of the support parts (9), a gap is provided between the two support parts (9), the voice coil (4) is arranged in the gap, the voice coil (4) is composed of two voice coil layers, and the two ends of the voice coil (4) are respectively folded in opposite directions to the side of the magnetic steel.

2. A loudspeaker according to claim 1, characterized in that: The voice coil (4) is in the shape of a Chinese character "I".

3. A loudspeaker according to claim 1 or 2, characterized in that: The magnetic steel (1) is bonded to the bracket (5), the diaphragm assembly (2) is bonded to the bracket (5), the FPC (3) is bonded to the lower end of the bracket (5), one end of the voice coil (4) is bonded to the FPC (3), the connecting pin of the voice coil (4) is welded to the FPC (3), and the other end of the voice coil (4) is inserted into the bracket (5) and bonded to the diaphragm assembly (2).

4. A loudspeaker according to claim 1 or 2, characterized in that: The voice coil layer comprises a base layer (10), conductor wires (11) and glue (13); the conductor wires (11) are evenly spaced on both sides of the base layer (10), and the glue (13) is arranged in gaps between the conductor wires (11).

5. A loudspeaker according to claim 4, characterized in that: The conductor wire (11) is made of a conductive material selected from the group consisting of Cu, Ag, Al and alloy, and has a thickness of 0.06-0.2 mm and a density of 6.7-10.5 mg / mm³.

6. A loudspeaker according to claim 4, characterized in that: The base layer (10) is a lightweight hard material such as PI, PET, or a polymer material, with a thickness of 0.012-0.03 mm and a density of 1.1-1.2 mg / mm³.

7. A loudspeaker according to claim 1, characterized in that: A connecting pad (12) is provided in the middle of the two voice coil layers.

8. The loudspeaker according to claim 1, characterized in that: The two voice coil layers are bonded together using heat-resistant glue.

9. The loudspeaker according to claim 1, characterized in that: The upper shell (6) is arranged at the upper end of the bracket (5), the lower shell (7) is arranged at the lower end of the bracket (5), and a sound outlet is provided on the upper shell (6).

10. The loudspeaker according to claim 1, characterized in that: The voice coil (4) is in a zigzag shape.

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