A miniature loudspeaker

Abstract

This invention provides a miniature loudspeaker, including a housing, a magnetic circuit system, a vibration system, a spider, and a control circuit. The magnetic circuit system is disposed within the housing's accommodating space, and the vibration system, comprising a diaphragm and a voice coil, is disposed at the opening of the housing. The spider is connected to the magnetic circuit system and the diaphragm at its two ends, respectively. A resonance cavity is formed between the magnetic circuit system and the housing. The magnetic circuit system has a first tuning hole, the diaphragm has a second tuning hole, and the spider is configured in a ring shape to form a third tuning hole. The first, third, and second tuning holes cooperate to form a sound-conducting channel connecting the outside world to the resonance cavity. The control circuit inputs a DC bias current to the voice coil to adjust the initial position of the diaphragm, and the spider extends or shortens accordingly so that different DC currents correspond to different sound-conducting channel lengths. Thus, by setting up a resonance cavity and a variable sound-conducting channel, the frequency response of a specific frequency band can be amplified under the constraint of the miniature loudspeaker's external size, thereby achieving maximum volume output.

Description

Technical Field

[0001] This invention relates to the field of audio equipment, and more particularly to a miniature loudspeaker. Background Technology

[0002] Miniature loudspeakers are a commonly used electroacoustic transducer. Moving-coil loudspeakers work by applying an electrical signal to a voice coil located in a magnetic gap created by a magnetic circuit system. This causes the voice coil to move under the Ampere force, driving the diaphragm to vibrate and thus pushing air to produce sound. Currently, most miniature loudspeakers on the market are designed for the entire frequency range and cannot amplify the frequency response of specific frequency bands. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a miniature loudspeaker that amplifies the frequency response of a specific frequency band under the condition of limited size.

[0004] This invention provides a miniature loudspeaker, comprising: a housing with an opening at the top forming an accommodating space; a magnetic circuit system disposed within the accommodating space, the magnetic circuit system being spaced from the housing to form a resonant cavity, the magnetic circuit system having a first tuning hole communicating with the resonant cavity; a vibration system disposed at the opening of the housing and including a diaphragm and a voice coil, the diaphragm having a second tuning hole communicating with the outside; a spider, the spider being configured as a ring structure to form a third tuning hole, the two ends of the spider being connected to the magnetic circuit system and the diaphragm respectively; and a control circuit configured to input a DC bias current to the voice coil to adjust the initial position of the diaphragm; wherein the first tuning hole, the third tuning hole, and the second tuning hole cooperate to form a sound guiding channel, the spider lengthening or shortening following the initial position change of the diaphragm so that different DC currents correspond to different sound guiding channel lengths.

[0005] Furthermore, the outer casing is provided with at least one fixing part, and the outer casing is fixedly connected to the magnetic circuit system through the fixing part.

[0006] Furthermore, the magnetic circuit system includes: a magnetic cup, which has a gap with the outer shell to form a resonant cavity, and the magnetic cup is fixedly connected to the fixing part; a magnet, which is disposed above the magnetic cup; and a top plate, which is disposed above the magnet; wherein, the first tuning hole passes through the magnetic cup, the magnet and the top plate.

[0007] Furthermore, the two ends of the spider are connected to the top plate and the diaphragm, respectively.

[0008] Furthermore, the magnetic bowl includes: a main body; and a side portion, the side portion extending upward from the edge of the main body and fixedly connected to the fixing portion; wherein, a magnet is disposed above the main body, and a first tuning hole penetrates the main body.

[0009] Furthermore, the housing includes: a base plate having a gap with the main body; and a side wall extending upward from the edge of the base plate and having a gap with the side portion, the side wall extending inward to form a fixing portion.

[0010] Furthermore, a receiving groove is formed on the side of the side portion facing the side wall; the fixing part extends into the receiving groove to be fixedly connected with the side portion.

[0011] Furthermore, the receiving groove is located at the top of the side portion.

[0012] Furthermore, multiple fixed parts are spaced apart to cooperate with the magnetic circuit system to form a leak that connects the resonant cavity.

[0013] Furthermore, the first tuning hole, the second tuning hole, and the third tuning hole together form a sound guide channel that is wider at the top and narrower at the bottom.

[0014] Furthermore, the opening of the outer shell is provided with a positioning groove; the edge positioning of the diaphragm is set in the positioning groove.

[0015] Furthermore, the spider includes: a support portion configured as a ring structure; a first connecting portion extending from the upper end of the support portion toward a direction away from the sound guide channel and connected to the diaphragm; and a second connecting portion extending from the lower end of the support portion toward a direction away from the sound guide channel and connected to the magnetic circuit system.

[0016] Furthermore, the cross-section of the support is set in a V shape and is recessed in the direction away from the sound guide channel.

[0017] Furthermore, the cross-section of the support is set to be sawtooth-shaped.

[0018] Furthermore, the cross-section of the support is set to be arc-shaped and recessed in the direction away from the sound guide channel.

[0019] Furthermore, the diaphragm includes: a diaphragm body; and a reinforcing member, which is attached to the diaphragm body; wherein, the second tuning hole passes through the diaphragm body and the reinforcing member.

[0020] Furthermore, the miniature speaker is configured as a rotating structure.

[0021] Furthermore, the diameter of the first tuning hole is the same as that of the second tuning hole.

[0022] Furthermore, the diameter of the third tuning hole is the same as that of the first and second tuning holes.

[0023] Furthermore, the diameter of the third tuning hole is larger than that of the first and second tuning holes.

[0024] This invention provides a miniature loudspeaker, comprising a housing, a magnetic circuit system, a vibration system, a spider, and a control circuit. The magnetic circuit system is housed within the housing's accommodating space, while the vibration system, located at the opening of the housing, includes a diaphragm and a voice coil. The spider is connected to both ends of the magnetic circuit system and the diaphragm, respectively. A resonance cavity is formed between the magnetic circuit system and the housing. The magnetic circuit system has a first tuning hole, the diaphragm has a second tuning hole, and the spider is configured in a ring shape to form a third tuning hole. The first, third, and second tuning holes cooperate to form a sound-conducting channel connecting the external environment to the resonance cavity. The control circuit inputs a DC bias current to the voice coil to adjust the initial position of the diaphragm. The spider extends or shortens following the initial position of the diaphragm, so that different DC currents correspond to different sound-conducting channel lengths. Therefore, by setting up a resonance cavity and a variable sound-conducting channel, the frequency response of a specific frequency band can be amplified within the constraints of the miniature loudspeaker's external dimensions, thereby achieving maximum volume output. Attached Figure Description

[0025] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0026] Figure 1 This is a schematic diagram of the structure of a miniature loudspeaker provided in an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of a miniature loudspeaker provided in an embodiment of the present invention;

[0028] Figure 3 This is an exploded schematic diagram of a miniature loudspeaker provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of a spring wave structure provided in an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of a shell provided in an embodiment of the present invention;

[0031] Figure 6 This is an installation diagram of a magnetic circuit system provided in an embodiment of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of a magnetic bowl provided in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of a diaphragm provided in an embodiment of the present invention;

[0034] Figure 9 This is a cross-sectional schematic diagram of another type of elastic wave provided in an embodiment of the present invention;

[0035] Figure 10This is a cross-sectional schematic diagram of another type of elastic wave provided in an embodiment of the present invention;

[0036] Figure 11 This is a cross-sectional schematic diagram of another miniature loudspeaker provided in an embodiment of the present invention;

[0037] Figure 12 This is a cross-sectional schematic diagram of another miniature loudspeaker provided in an embodiment of the present invention;

[0038] Figure 13 This is a cross-sectional schematic diagram of another miniature loudspeaker provided in an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Outer shell; 11-Resonating cavity; 12-Sound guide channel; 13-Fixing part; 14-Positioning groove; 15-Base plate; 16-Side wall; 17-Leakage hole; 2-Magnetic circuit system; 21-First tuning hole; 22-Magnetic cup; 221-Main body; 222-Side part; 2221-Receiving groove; 23-Magnet; 24-Top plate; 25-Gap; 3-Vibration system; 31-Second tuning hole; 32-Diaphragm; 321-Diaphragm body; 322-Reinforcing member; 33-Voice coil; 34-Outer through hole; 4-Spider; 41-Third tuning hole; 42-Support part; 43-First connecting part; 44-Second connecting part. Detailed Implementation

[0041] The present invention is described below based on embodiments, but the invention is not limited to these embodiments. In the detailed description of the invention below, certain specific details are described in detail. Those skilled in the art will fully understand the invention even without these details. To avoid obscuring the essence of the invention, well-known methods, processes, flows, elements, and circuits are not described in detail.

[0042] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0043] Unless the context explicitly requires it, words such as "including" or "contains" throughout the application documents should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to".

[0044] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] For ease of explanation, spatially related terms such as “inner,” “outer,” “below,” “below,” “lower,” “above,” “upper,” “left,” “right,” etc., are used herein to describe the relationship between one element or feature illustrated in the figure and another element or feature. It will be understood that spatially related terms may be intended to encompass different orientations of the device in use or operation besides those depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would then be positioned “above” those other elements or features. Thus, the exemplified term “below” can encompass both above and below orientations.

[0046] Figure 1 This is a schematic diagram of the structure of a miniature loudspeaker provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the miniature speaker provided in this embodiment of the invention is configured as a cylindrical structure, that is, a rotating structure. As an optional implementation, the cross-section of the miniature speaker can also be configured as a rectangle, ellipse, or other shapes. Further, Figure 2 This is a cross-sectional schematic diagram of a miniature loudspeaker provided in an embodiment of the present invention. Figure 3 This is an exploded schematic diagram of a miniature loudspeaker provided in an embodiment of the present invention, combined with... Figure 2 and Figure 3 As shown, the miniature loudspeaker includes a housing 1, a magnetic circuit system 2, a vibration system 3, and a spider 4. Specifically, the top opening of the housing 1 forms an accommodating space communicating with the outside. The magnetic circuit system 2 is disposed within the accommodating space inside the housing 1 and is adapted to form a magnetic gap region for generating a magnetic field. Figure 2 As shown, the magnetic circuit system 2 has a gap with the outer shell 1, thereby dividing the interior of the outer shell 1 to form a resonant cavity 11 in conjunction with the bottom of the outer shell 1. Simultaneously, the magnetic circuit system 2 is provided with a first tuning hole 21 communicating with the resonant cavity 11. Combined with... Figure 2 and Figure 3 As shown, the vibration system 3 is located at the opening of the housing 1 and includes a diaphragm 32 and a voice coil 33. The diaphragm 32 is provided with a second tuning hole 31 that communicates with the outside. Figure 4 This is a schematic diagram of a spring wave structure provided in an embodiment of the present invention, combined with... Figure 2 and Figure 4 As shown, the spider 4 is configured as a ring structure to form a third tuning hole 41. At the same time, the two ends of the spider 4 are connected to the magnetic circuit system 2 and the diaphragm 32 respectively, so that the third tuning hole 41 is aligned with and connected to the first tuning hole 21 and the second tuning hole 31 respectively.

[0047] like Figure 2As shown, the first tuning hole 21, the third tuning hole 41, and the second tuning hole 31 are located on the same axis and cooperate with each other to form a sound guiding channel 12 connecting the resonance cavity 11 with the outside world. The sound guiding channel 12 is located at the center of the miniature loudspeaker to ensure vibration stability. It should be noted that by setting the resonance cavity 11, the sound signal can be physically divided based on the Helmholtz resonance principle to optimize the listening experience. It should be further noted that the spider 4 is elastic and can undergo elastic deformation in the vertical direction. The miniature loudspeaker also includes a control circuit, which can input a DC bias current to the voice coil 33, thereby adjusting the initial position of the diaphragm 32 by moving the voice coil 33. At the same time, the spider 4 can undergo elastic deformation with the movement of the diaphragm 32 to change the length of the sound guiding channel 12. That is, when the initial position of the diaphragm 32 changes, the spider 4 lengthens or shortens accordingly, thereby increasing or decreasing the length of the third tuning hole 41, and thus different DC currents correspond to different sound guiding channel lengths. It is easy to understand that when the diaphragm 32 moves upward, the spider 4 is stretched, and the sound guide channel 12 becomes longer; when the diaphragm 32 moves downward, the spider 4 is compressed, and the sound guide channel 12 becomes shorter. Therefore, by setting up the sound guide channel 12 connecting the resonant cavity 11 and the outside world, the sound waves from the resonant cavity can be conducted and amplified along the sound emission direction using the sound guide design. This allows for amplification of the frequency response of a specific frequency band to achieve maximum volume output within the constraints of the miniature speaker's size. Simultaneously, the length of the sound guide channel 12 can be changed using the control circuit and the elastic deformation structure of the spider 4, thereby altering the resonant frequency and maximizing the output sound pressure at a specific frequency.

[0048] Figure 5 This is a schematic diagram of the structure of a shell provided in an embodiment of the present invention, such as... Figure 5 As shown, in one embodiment, the outer casing 1 is provided with at least one fixing part 13. It is readily understood that the outer casing 1 is fixedly connected to the magnetic circuit system 2 via the fixing part 13. That is, the magnetic circuit system 2 is suspended within the accommodating space of the outer casing 1 by being fixedly connected to the fixing part 13, i.e., it is installed inside the outer casing 1.

[0049] Figure 6 This is an installation diagram of a magnetic circuit system provided in an embodiment of the present invention, as shown below. Figure 6 As shown, in one embodiment, multiple fixing parts 13 are spaced apart, thereby cooperating with the magnetic circuit system 2 to form a vent 17 that connects to the resonant cavity 11. Thus, when the miniature speaker is operating, internal air can flow through the vent 17, ensuring the formation of a Helmholtz resonant cavity and improving the miniature speaker's heat dissipation capacity, thereby helping to avoid distortion.

[0050] like Figure 2As shown, in one embodiment, the magnetic circuit system 2 includes a magnetic cup 22, a magnet 23, and a top plate 24. Specifically, the magnetic cup 22 has a gap with the outer shell 1, thereby forming a resonant cavity 11. It is easy to understand that the magnetic cup 22 is fixedly connected to the fixing part 13. Further, the magnet 23 is disposed above the magnetic cup 22, and the top plate 24 is disposed above the magnet 23. Even further, a first tuning hole 21 passes through the magnetic cup 22, the magnet 23, and the top plate 24. That is, the magnetic cup 22, the magnet 23, and the top plate 24 are provided with through holes that are matched in position to form the first tuning hole 21. In this embodiment, the magnetic circuit system 2 generates a magnetic field through the magnetic cup 22, the magnet 23, and the top plate 24, so that the voice coil 33 drives the diaphragm 32 to vibrate under the action of the magnetic field.

[0051] Figure 7 This is a schematic diagram of the structure of a magnetic bowl provided in an embodiment of the present invention, as shown below. Figure 7 As shown, in one embodiment, the magnetic bowl 22 includes a disc-shaped main body 221 and an annular side portion 222 extending upward from the edge of the main body 221. It is readily understood that the first tuning hole 21 passes through the main body 221, and the magnetic bowl 22 is fixedly connected to the fixing portion 13 via the side portion 222. Figure 6 As shown, a gap 25 is formed between the side portion 222, the magnet 23, and the top plate 24, which forms a magnetic gap region.

[0052] Combination Figure 2 and Figure 3 As shown, in one embodiment, the diaphragm 32 is connected to the opening of the housing 1. Corresponding to the cylindrical miniature loudspeaker, the diaphragm 32 is circular. It should be noted that the diaphragm 32 is typically made of a thin sheet material with low density and good rigidity, such as a paper disc, plastic diaphragm, or glass fiber diaphragm. Figure 8 This is a schematic diagram of the structure of a diaphragm provided in an embodiment of the present invention, combined with... Figure 2 and Figure 8 As shown, the diaphragm 32 is provided with a second tuning hole 31, that is, the second tuning hole 31 penetrates the diaphragm 32. Furthermore, combined with... Figure 2 As shown, the voice coil 33 is inserted into the gap 25 formed between the side portion 222 and the magnet 23 and the top plate 24. That is, the voice coil 33 is located in the magnetic gap region formed by the magnetic circuit system 2, thereby allowing the diaphragm 32 to vibrate in a controlled manner. Specifically, the voice coil 33 moves under the influence of the magnetic field formed within the magnetic circuit system 2 according to the electrical signal generated by the external electrical signal generator and transmitted through the conductive connector, driving the diaphragm 32 to vibrate, causing changes in the density of the surrounding air to produce sound.

[0053] like Figure 8As shown, in one embodiment, the diaphragm 32 includes a diaphragm body 321 and a reinforcing member 322 attached to the diaphragm body 321. The reinforcing member 322 can increase the strength at the center of the diaphragm 32, thereby stabilizing the vibration posture of the diaphragm 32 and improving the sound quality of the miniature loudspeaker. It should be noted that the second tuning hole 31 penetrates through the diaphragm body 321 and the reinforcing member 322.

[0054] like Figure 5 As shown, in one embodiment, the outer casing 1 includes a base plate 15 configured as a disc and a sidewall 16 extending upward from the edge of the base plate 15. Further, a gap exists between the base plate 15 and the main body portion 221, while a gap exists between the sidewall 16 and the side portion 222, thereby forming a resonant cavity 11. It is readily understood that the fixing portion 13 is formed by extending inward from the sidewall 16.

[0055] like Figure 7 As shown, in one embodiment, a receiving groove 2221 is recessed on the side of the side portion 222 facing the sidewall 16. (This is in conjunction with...) Figure 2 It is easy to understand that the fixing part 13 extends into the receiving groove 2221, thereby achieving a fixed connection with the side part 222, that is, realizing the installation of the magnetic circuit system 2 on the outer shell 1. It should be noted that in this embodiment, the outer shell 1 is provided with the fixing part 13, and the side part 222 is correspondingly provided with the receiving groove 2221. As an optional embodiment, the side part 222 is provided with a protrusion, and the outer shell 1 is correspondingly provided with a groove, so that the magnetic circuit system 2 is installed on the outer shell 1 by the protrusion and the groove.

[0056] like Figure 7 As shown, in one embodiment, the receiving groove 2221 is located at the top of the side portion 222. It is readily understood that the receiving groove 2221 is configured as a ring structure. This facilitates the fitting of the fixing portion 13 into the receiving groove 2221, thereby facilitating the installation of the magnetic circuit system 2.

[0057] like Figure 5 As shown, in one embodiment, the fixing part 13 is configured as a sheet-like structure. It is easy to understand that the sheet-like fixing part 13 has a large contact area when it mates with the receiving groove 2221, which helps to improve the installation strength between the fixing part 13 and the receiving groove 2221, thereby ensuring that the magnetic circuit system 2 can be stably installed on the housing 1.

[0058] In one embodiment, the sheet-like fixing portion 13 is arranged in a horizontal direction. Simultaneously, corresponding to the dimensional difference between the sidewall 16 and the side portion 222, the cross-section of each fixing portion 13 is an isosceles trapezoid. That is, the size of the fixing portion 13 gradually decreases from the sidewall 16 towards the side portion 222, thereby ensuring that the fixing portion 13 has sufficient structural strength while allowing the orifice 17 to be large enough for airflow.

[0059] like Figure 5 As shown, in one embodiment, a positioning groove 14 is provided at the opening of the housing 1, that is, at the top of the side wall 16. It is readily understood that the edge of the diaphragm 32 is positioned within the positioning groove 14. Therefore, by providing the positioning groove 14, it is helpful to position and install the diaphragm 32, avoiding quality problems in the miniature speaker caused by installation deviations of the diaphragm 32.

[0060] like Figure 2 As shown, in one embodiment, the two ends of the spider 4 are connected to the top plate 24 and the diaphragm 32, respectively. Specifically, as... Figure 4 As shown, in one embodiment, the spider 4 includes a support portion 42, a first connecting portion 43, and a second connecting portion 44. Specifically, the support portion 42 is configured as a ring structure to form a third tuning hole 41. Further, the first connecting portion 43 extends from the upper end of the support portion 42 in a direction away from the sound guide channel 12 and is connected to the diaphragm 32, that is, to the vibration system 3. Correspondingly, the second connecting portion 44 extends from the lower end of the support portion 42 in a direction away from the sound guide channel 12 and is connected to the top plate 24, that is, to the magnetic circuit system 2. Thus, by installing the spider 4 between the magnetic circuit system 2 and the vibration system 3, the third tuning hole 41 cooperates with the first tuning hole 21 and the second tuning hole 31 to form the sound guide channel 12.

[0061] Combination Figure 2 As is easily understood, in one embodiment, the cross-section of the support portion 42 is set in a V-shape. It should be noted that the V-shaped support portion 42 is recessed in the direction away from the sound guide channel 12. Thus, through the design of the support portion 42 structure, it can be ensured that when the diaphragm 32 shifts, the spring wave 4 can undergo elastic deformation synchronously, thereby changing the length of the sound guide channel 12 and adjusting the resonant frequency.

[0062] Figure 9 This is a cross-sectional schematic diagram of another type of elastic wave provided in an embodiment of the present invention, as shown below. Figure 9 As shown, in one embodiment, the cross-section of the support portion 42 is set in a sawtooth shape. Therefore, through the design of the support portion 42 structure, it can be ensured that the spring wave 4 can undergo elastic deformation synchronously when the diaphragm 32 shifts, thereby changing the length of the sound guide channel 12 and adjusting the resonant frequency.

[0063] Figure 10 This is a cross-sectional schematic diagram of another type of elastic wave provided in an embodiment of the present invention, such as... Figure 10 As shown, in one embodiment, the cross-section of the support portion 42 is set to an arc shape. It should be noted that the arc-shaped support portion 42 is recessed in the direction away from the sound guide channel 12. Therefore, through the design of the support portion 42 structure, it can be ensured that the diaphragm 32 shifts and the spring wave 4 can undergo elastic deformation simultaneously, thereby changing the length of the sound guide channel 12 and thus adjusting the resonant frequency.

[0064] It should be noted that, corresponding to the rotating structure of the miniature speaker in this embodiment, the sound guide channel 12 in this embodiment is generally set as a circular hole. Combined with... Figure 2 As is easily understood, in one embodiment, the first tuning hole 21 and the second tuning hole 31 are set as round holes, and the diameter of the first tuning hole 21 is equal to that of the second tuning hole 31.

[0065] like Figure 2 As shown, in one embodiment, the diameter of the third tuning hole 41 is equal to the diameter of the first tuning hole 21 and the second tuning hole 31. Thus, sound waves can be stably transmitted through the straight sound-conducting channel 12. Figure 11 This is a cross-sectional schematic diagram of another miniature loudspeaker provided in an embodiment of the present invention, as shown below. Figure 11 As shown, in one embodiment, the diameter of the third tuning hole 41 is larger than the diameters of the first tuning hole 21 and the second tuning hole 31. Therefore, the structural change in the sound guide channel 12 helps to adjust the sound waves.

[0066] Figure 12 This is a cross-sectional schematic diagram of another miniature loudspeaker provided in an embodiment of the present invention, as shown below. Figure 12 As shown, in one embodiment, the diaphragm 32 has multiple external through holes 34 surrounding the second tuning hole 31, connecting the interior of the miniature speaker to the outside. It should be noted that the multiple external through holes 34 are arranged in a ring array to prevent the diaphragm 32 from being polarized by interference. Furthermore, the external through holes 34 penetrate the diaphragm body 321 and the reinforcing member 322. Thus, by adding multiple external through holes 34 to the second tuning hole 31, airflow is facilitated, thereby both amplifying the frequency response of a specific frequency band in conjunction with the sound guide channel 12 and improving the heat dissipation capacity of the miniature speaker.

[0067] Figure 13 This is a cross-sectional schematic diagram of another miniature loudspeaker provided in an embodiment of the present invention, as shown below. Figure 13In one embodiment, the first tuning hole 21, the second tuning hole 31, and the third tuning hole 41 together form the sound guiding channel 12, which is wider at the top and narrower at the bottom. The tapered through-hole structure reduces the diameter at one end, increasing airflow velocity and decreasing pressure, while the other end expands, reducing acoustic resistance and thus amplifying sound. Furthermore, this sound guiding channel 12 also resembles a Venturi tube structure, exhibiting an ejection effect that accelerates gas flow. This allows the sound waves from the resonating cavity to be conducted, superimposed, and amplified along the sound emission direction using the sound guiding design, thereby improving the sound emission efficiency of the miniature loudspeaker.

[0068] This invention provides a miniature loudspeaker, comprising a housing, a magnetic circuit system, a vibration system, a spider, and a control circuit. The magnetic circuit system is housed within the housing's accommodating space, while the vibration system, located at the opening of the housing, includes a diaphragm and a voice coil. The spider is connected to both ends of the magnetic circuit system and the diaphragm, respectively. A resonance cavity is formed between the magnetic circuit system and the housing. The magnetic circuit system has a first tuning hole, the diaphragm has a second tuning hole, and the spider is configured in a ring shape to form a third tuning hole. The first, third, and second tuning holes cooperate to form a sound-conducting channel connecting the external environment to the resonance cavity. The control circuit inputs a DC bias current to the voice coil to adjust the initial position of the diaphragm. The spider extends or shortens following the initial position of the diaphragm, so that different DC currents correspond to different sound-conducting channel lengths. Therefore, by setting up a resonance cavity and a variable sound-conducting channel, the frequency response of a specific frequency band can be amplified within the constraints of the miniature loudspeaker's external dimensions, thereby achieving maximum volume output.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can be modified and varied in various ways. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of protection of the present invention.

Claims

1. A micro speaker, characterized by, The micro speaker comprises: a shell (1) having a top opening forming a containing space; a magnetic circuit system (2) disposed in the containing space, having a spacing from the shell (1) to form a resonance cavity (11), and being provided with a first tuning hole (21) communicating with the resonance cavity (11); a vibration system (3) disposed at the opening of the shell (1) and comprising a diaphragm (32) and a voice coil (33), the diaphragm (32) being provided with a second tuning hole (31) communicating with the outside; a spider (4) disposed in a ring structure to form a third tuning hole (41), and having two ends connected with the magnetic circuit system (2) and the diaphragm (32) respectively; and a control circuit configured to input a direct current bias current to the voice coil (33) to adjust the initial position of the diaphragm (32); wherein the first tuning hole (21), the third tuning hole (41) and the second tuning hole (31) cooperate to form a sound guide channel (12), and the spider (4) is elongated or shortened following the change of the initial position of the diaphragm (32) to make different direct currents correspond to different sound guide channel lengths.

2. The microspeaker of claim 1, wherein, The shell (1) is provided with at least one fixing part (13), and the shell (1) is fixedly connected with the magnetic circuit system (2) through the fixing part (13).

3. The microspeaker of claim 2, wherein, The magnetic circuit system (2) comprises: a magnetic bowl (22) having a spacing from the shell (1) to form the resonance cavity (11), and being fixedly connected with the fixing part (13); a magnet (23) disposed above the magnetic bowl (22); and a top sheet (24) disposed above the magnet (23); wherein the first tuning hole (21) penetrates through the magnetic bowl (22), the magnet (23) and the top sheet (24).

4. The microspeaker of claim 3, wherein, The two ends of the spider (4) are connected with the top sheet (24) and the diaphragm (32) respectively.

5. The microspeaker of claim 3, wherein, The magnetic bowl (22) comprises: a main body part (221); and a side edge part (222) extending upward from the edge of the main body part (221) and being fixedly connected with the fixing part (13); wherein the magnet (23) is disposed above the main body part (221), and the first tuning hole (21) penetrates through the main body part (221).

6. The microspeaker of claim 5, wherein, The shell (1) comprises: a bottom plate (15) having a spacing from the main body part (221); and a side wall (16) extending upward from the edge of the bottom plate (15) and having a spacing from the side edge part (222), and the side wall (16) extends toward the inside to form the fixing part (13).

7. The microspeaker of claim 6, wherein, The side edge part (222) is recessed toward one side of the side wall (16) to form an accommodating groove (2221). The fixing part (13) extends into the accommodating groove (2221) to be fixedly connected with the side part (222).

8. The microspeaker of claim 7, wherein, The accommodating groove (2221) is located at the top end of the side part (222).

9. The microspeaker of any of claims 2-8, wherein, A plurality of fixing parts (13) are arranged at intervals to form a leakage hole (17) communicating with the resonance cavity (11) in cooperation with the magnetic circuit system (2).

10. The microspeaker of claim 1, wherein, The first tuning hole (21), the second tuning hole (31) and the third tuning hole (41) jointly form the sound guide channel (12) which is wide at the top and narrow at the bottom.

11. The microspeaker of claim 1, wherein, The opening of the shell (1) is provided with a positioning groove (14). The edge of the diaphragm (32) is positioned in the positioning groove (14).

12. The microspeaker of claim 1, wherein, The elastic wave (4) comprises: A support part (42) arranged in a ring structure; A first connecting part (43) extending from the upper end of the support part (42) in a direction away from the sound guide channel (12) and connected with the diaphragm (32); and A second connecting part (44) extending from the lower end of the support part (42) in a direction away from the sound guide channel (12) and connected with the magnetic circuit system (2).

13. The microspeaker of claim 12, wherein, The cross section of the support part (42) is V-shaped and recessed in a direction away from the sound guide channel (12).

14. The microspeaker of claim 12, wherein, The cross section of the support part (42) is sawtooth-shaped.

15. The microspeaker of claim 12, wherein, The cross section of the support part (42) is circular arc-shaped and recessed in a direction away from the sound guide channel (12).

16. The microspeaker of claim 1, wherein, The diaphragm (32) comprises: A diaphragm body (321); and A reinforcing member (322) attached to the diaphragm body (321); The second tuning hole (31) penetrates the diaphragm body (321) and the reinforcing member (322).

17. The microspeaker of claim 1, wherein, The micro speaker is arranged in a rotary body structure.

18. The microspeaker of claim 1, wherein, The aperture of the first tuning hole (21) is equal to that of the second tuning hole (31).

19. The microspeaker of claim 18, wherein, The aperture of the third tuning hole (41) is equal to that of the first tuning hole (21) and the second tuning hole (31).

20. The microspeaker of claim 18, wherein, The aperture of the third tuning hole (41) is greater than that of the first tuning hole (21) and the second tuning hole (31).

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