Audio output device, earphone and ultra-linear multi-magnetic double membrane horn

Abstract

The acoustic output device and earphones include a first diaphragm, a driving member, a second diaphragm, and a case structure. A first cavity is formed by the second diaphragm and a space close to the driving member of the first diaphragm and the case structure, and a second cavity is formed by the space between the electroacoustic transducer and the second diaphragm and the case structure. In an operating state, the driving member drives the vibration of the first diaphragm and passively vibrates the second diaphragm. The volume of the second cavity is 1 / 5 or less of the equivalent volume of the electroacoustic transducer.

Description

[Technical field]

[0001] This application relates to the field of sound generating device technology, and in particular to sound output devices, earphones and ultra-linear multi-magnetic dual membrane horns. [Background technology]

[0002] 2. Description of the Related Art As society develops, the range of applications of sound output devices, such as earphones, becomes wider and wider, and the requirements for sound quality and comfort when wearing earphones become higher and higher.

[0003] The open-type earphones according to the related art are not inserted into the human ear canal, and therefore have relatively excellent comfort performance when worn. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application mainly aims to provide an audio output device, an earphone and an ultra-linear multi-magnetic double membrane horn, which is intended to improve the bass performance of the audio output device and the earphone, and ensure the linearity of the frequency response of the ultra-linear multi-magnetic double membrane horn. [Means for solving the problem]

[0005] In order to achieve the above object, in a first aspect, the present application provides an audio output device, the audio output device comprising: an electroacoustic transducer including a driving member and a first diaphragm provided on one side of the driving member and connected to the driving member; a second diaphragm provided on a side of the driving member away from the first diaphragm and spaced apart from the electroacoustic transducer; a case structure configured to support the electroacoustic transducer and the second diaphragm, wherein a first cavity is formed by a space between a surface of the second diaphragm close to the driving member and a surface of the first diaphragm close to the driving member and the case structure, and a second cavity is formed by a space between a surface of the electroacoustic transducer close to the second diaphragm and the second diaphragm and the case structure, In an operating state, the driving member drives the vibration of the first vibrating membrane, the first vibrating membrane moves to vibrate an air spring enclosed in the first cavity and passively vibrates the second vibrating membrane in accordance with the air spring, and the volume of the second cavity is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer.

[0006] In a second aspect, the present application further provides an earphone comprising an audio output device, the audio output device comprising: an electroacoustic transducer including a driving member and a first diaphragm provided on one side of the driving member and connected to the driving member; a second diaphragm provided on a side of the driving member away from the first diaphragm and spaced apart from the electroacoustic transducer; a case structure configured to support the electroacoustic transducer and the second diaphragm, wherein a first cavity is formed by a space between a surface of the second diaphragm close to the driving member and a surface of the first diaphragm close to the driving member and the case structure, and a second cavity is formed by a space between a surface of the electroacoustic transducer close to the second diaphragm and the second diaphragm and the case structure, In an operating state, the driving member drives the vibration of the first vibrating membrane, the first vibrating membrane moves to vibrate an air spring enclosed in the first cavity and passively vibrates the second vibrating membrane in accordance with the air spring, and the volume of the second cavity is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer.

[0007] In a third aspect, the present application provides an ultra-linear multi-magnetic double vibrating membrane horn comprising a bracket, a second copper ring is provided inside the bracket, a first copper ring is provided on an upper surface of the bracket, a composite vibrating membrane is provided on one side of the first copper ring, and a composite membrane piece is provided inside the bracket. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic structural diagram of a first type of audio output device provided by an embodiment of the present application; FIG. [Diagram 2] FIG. 2 is a structural schematic diagram of one of the second cavities of the acoustic output device provided by the embodiments of the present application. [Diagram 3] 1 is a schematic diagram of a three-dimensional structure of an audio output device provided according to an embodiment of the present application. [Figure 4] FIG. 2 is a structural schematic diagram of one of the third cavities of the acoustic output device provided by the embodiments of the present application. [Diagram 5] FIG. 13 is a structural schematic diagram of one of the fourth cavities of the acoustic output device provided by the embodiment of the present application. [Figure 6] FIG. 2 is a schematic diagram of a second type of structure of an audio output device provided by an embodiment of the present application. [Figure 7] FIG. 2 is a schematic structural diagram of a third type of audio output device provided by an embodiment of the present application. [Figure 8] FIG. 11 is a schematic structural diagram of a fourth type of audio output device provided by an embodiment of the present application. [Figure 9] FIG. 2 is a structural schematic diagram of an earphone provided according to an embodiment of the present application. [Figure 10] FIG. 10 is a structural schematic diagram of the earphone shown in FIG. 9 in another direction. [Figure 11] FIG. 10 is a structural schematic diagram of the earphone shown in FIG. 9 in another direction. [Figure 12] FIG. 10 is a structural schematic diagram of the earphone shown in FIG. 9 in another direction. [Figure 13] FIG. 10 is a schematic diagram of an application scene of the earphone shown in FIG. [Figure 14] FIG. 2 is an exploded view of an ultra-linear multi-magnetic dual membrane horn provided by an embodiment of the present application. [Figure 15] FIG. 2 is a schematic side view of the structure of an ultra-linear multi-magnetic double vibrating membrane horn provided by an embodiment of the present application. [Figure 16] FIG. 2 is a structural schematic diagram of a portion of a first insertion pin provided by an embodiment of the present application; [Figure 17] FIG. 2 is a schematic side view of the internal structure of the ultra-linear multi-magnetic double vibrating membrane horn provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0010] Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to Figures 1 to 13 in the embodiments of the present application. Of course, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor, all belong to the protection scope of the present application.

[0011] The embodiments of the present application provide an audio output device and an earphone, and the earphone may include an audio output device. When the audio output device or the earphone is attached to a human ear, the audio output device and the earphone may transmit an audio signal to the ear. The audio output device and the earphone provided by the embodiments of the present application have excellent bass performance and can solve the problem of insufficient bass of earphones in the related art. This will be described below with reference to the drawings.

[0012] Please refer to Fig. 1. Fig. 1 is a first structural schematic diagram of an acoustic output device 100 provided by an embodiment of the present application. The acoustic output device 100 includes an electro-acoustic transducer 110, a second vibrating membrane 120, and a case structure 130.

[0013] The electroacoustic transducer 110 includes a driving member 112 and a first diaphragm 111 provided on a first side of the driving member 112 and connected to the driving member 112. The second diaphragm 120 is provided on a second side of the driving member 112 opposite to the first side, and the second diaphragm 120 may be located on a side of the driving member 112 away from the first diaphragm 111 such that the first diaphragm 111, the driving member 112, and the second diaphragm 120 are arranged in a layered manner along a direction H1 (thickness direction of the sound output device 100) from the first side toward the second side. The second diaphragm 120 is provided at a distance from the electroacoustic transducer 110, and the second diaphragm 120 is not physically connected to the electroacoustic transducer 110. The case structure 130 is configured to support the electroacoustic transducer 110 and the second vibrating membrane 120, and a first cavity 101 is formed by a space between a surface of the second vibrating membrane 120 close to the driving member 112 and a surface of the first vibrating membrane 111 close to the driving member 112 and the case structure 130, and the first cavity 101 can be formed into a sealed cavity by being positionally restricted by the first vibrating membrane 111, the second vibrating membrane 120, and the case structure 130, and the air sealed in the first cavity 101 can form an air spring (or a similar one) by receiving a biasing force due to vibration. When the sound output device 100 is in an operating state, the drive member 112 can drive the vibration of the first vibrating membrane 111, and the first vibrating membrane 111 can move the air spring sealed in the first cavity 101 to vibrate, and can passively vibrate the second vibrating membrane 120 according to the air spring. A second cavity 102 is formed by the space between the surface of the electro-acoustic transducer 110 close to the second vibrating membrane 120 and the second vibrating membrane 120 and the case structure 130, and the second cavity 102 may be a sub-cavity of the first cavity 101, and the volume of the second cavity 102 is less than or equal to 1 / 5 of the equivalent volume of the electro-acoustic transducer 110 (smaller or equal).

[0014] It should be understood that the equivalent volume of the acoustic output device 100 means that, after the acoustic output device 100 is placed in a box of a certain internal volume, the internal volume of the box becomes the equivalent volume of the acoustic output device 100 when the acoustic compliance of the air in the box is exactly equal to the acoustic compliance of the acoustic output device 100. The acoustic compliance can be converted into a force compliance or equivalent compliance depending on the area of ​​the vibrating membrane of the electro-acoustic transducer 110, i.e., the first vibrating membrane 111 in this example, and the force compliance can indicate the compliance of the displacement after the slack or force is applied to the suspension system of a sound generating device such as the acoustic output device 100. Force compliance = acoustic compliance / S 2 where S is the area of ​​the first diaphragm 111 of the electroacoustic transducer 110. A high-compliance sound output device 100 or sound generating device has a large displacement after a force is applied to the diaphragm, and has a low resonant frequency when the mass of the diaphragm is the same, and the unit of compliance is meters per newton (m / N).

[0015] In the embodiment of the present application, the first vibrating membrane 111 is connected to the driving member 112 and receives the driving force of the driving member 112, and the second vibrating membrane 120 is spaced apart from the driving member 112 and passively vibrates under the action of the air spring, whereby a dual-membrane vibration system can be formed by the first vibrating membrane 111, the driving member 112, the air spring, and the second vibrating membrane 120 of the present application. Under the action of vibration of the two vibrating membranes, the sound output device 100 of the present application can transmit an acoustic signal to the outside of the sound output device 100 from the side of the first vibrating membrane 111 that is away from the driving member 112 and the side of the second vibrating membrane 120 that is away from the driving member 112. At this time, the low-frequency resonance frequency of the sound output device 100 is affected by the mass and compliance of the air spring and the mass and compliance of the second vibrating membrane 120.

[0016] When the volume of the second cavity 102 formed by the second vibrating membrane 120, the surface of the electro-acoustic transducer 110 close to the second vibrating membrane 120, and the case structure 130 is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer 110, the volume of the second cavity 102 is small, the compliance of the air spring is small, and the elasticity of the air spring is large, so that more of the energy of the first vibrating membrane 111 can be transmitted to the second vibrating membrane 120, and the second vibrating membrane 120 can provide the acoustic output device 100 with a low low-frequency resonant frequency, and the acoustic output device 100 can provide low-frequency signals with a wider frequency spectrum, so that the acoustic output device 100 has excellent bass performance.

[0017] In some embodiments, the volume of the second cavity 102 may even be 1 / 6, 1 / 8, 1 / 10, 1 / 15, etc., or less of the equivalent volume of the electro-acoustic transducer 110, in which case the volume of the second cavity 102 is smaller, the frequency spectrum of the low-frequency signal output from the acoustic output device 100 is wider, and the bass performance of the acoustic output device 100 is better. The embodiments of the present application do not particularly limit the volume of the second cavity 102.

[0018] In some embodiments, the driving member 112 includes a mounting bracket 1121, a magnetic circuit assembly 1122, and a voice coil 1123, the magnetic circuit assembly 1122 may be disposed on the mounting bracket 1121, the voice coil 1123 can cut the magnetic induction line of the magnetic circuit assembly 1122, and the voice coil 1123 is fixedly connected to the first vibrating membrane 111, for example, adhesion between the first vibrating membrane 111 and the voice coil 1123 can be achieved using an adhesive, but is not limited to this. When an electrical signal passes through the voice coil 1123, the voice coil 1123 and the magnetic circuit assembly 1122 interact to cause the vibration of the first vibrating membrane 111, which then causes the air spring in the first cavity 101 to vibrate and can cause the second vibrating membrane 120 to passively vibrate according to the air spring, where the first vibrating membrane 111 may be an active membrane of the acoustic output device 100 and the second vibrating membrane 120 may be a passive membrane of the acoustic output device 100.

[0019] In some embodiments, the second diaphragm 120 may be fixedly connected to the case structure 130 and spaced apart from the driving member 112, for example, but not limited to, the second diaphragm 120 may be adhered and fixed to the case structure 130 using an adhesive. A space is provided between the second diaphragm 120 and a surface of the driving member 112 that is away from the first diaphragm 111, such that the second diaphragm 120 is a passive membrane of the audio output device 100.

[0020] In the acoustic output device 100 of the embodiment of the present application, through the action of the electro-acoustic transducer 110, the second vibrating membrane 120, and the case structure 130, a dual vibrating membrane vibration sound generating system can be formed by the first vibrating membrane 111, the driving member 112, the air spring in the first cavity 101, and the second vibrating membrane 120, and the acoustic output device 100 has small attenuation in low-frequency acoustic signals due to the vibration of the two vibrating membranes, and the acoustic output device 100 has excellent low-frequency performance. Furthermore, when the volume of the second cavity 102 formed by the second vibrating membrane 120, the surface of the electro-acoustic transducer 110 close to the second vibrating membrane 120, and the case structure 130 is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer 110, the volume of the second cavity 102 is small and more of the energy of the first vibrating membrane 111 can be transmitted to the second vibrating membrane 120, and since the second vibrating membrane 120 has a certain area (in the present application, the area of ​​the second vibrating membrane 120 is much larger than the cross-sectional area of ​​the sound-guiding tube, compared to the solution in the related art of sound guidance by a sound-guiding tube), the vibration amplitude of the second vibrating membrane 120 becomes lower, and the second vibrating membrane 120 can provide a low low-frequency resonant frequency to the audio output device 100, and the audio output device 100 can provide low-frequency signals with a wider frequency spectrum, so that the audio output device 100 has better bass performance. In addition, since the first cavity 101 is a sealed space, compared to a solution using a sound guide tube, the sound output device 100 of the present application does not produce friction noise caused by squeezing air, which can further improve the sound quality of the sound output device 100. Furthermore, compared to the solution in the related art of arranging two independent electro-acoustic transducers 110, the second diaphragm 120 of the present application is a passive membrane and occupies a small space, which can realize a miniaturized design of the sound output device 100 and the earphone 10 of the present application, making the earphone 10 more compact and easier to wear.

[0021] In some embodiments, a projection portion of the electro-acoustic transducer 110 where a first orthogonal projection on a first reference plane parallel to the first diaphragm 111 and a second orthogonal projection on the first reference plane of the second diaphragm 120 overlap has a first area. The projection having a larger area out of the first orthogonal projection and the second orthogonal projection has a second area, and the value of the ratio between the first area and the second area may be between 0.7-1 (the value of the ratio may be equal to 0.7 or 1, and the numerical ranges in this application are inclusive of the values ​​of the end points unless otherwise specified and will not be repeated below), and the value of the ratio between the first area and the second area may be between 0.7 and 1. Preferably, the value of the ratio between the first area and the second area may be between 0.8-1, and more preferably, the value of the ratio may be between 0.9-1. Based on the volume formula, when the value of the ratio between the first area and the second area is between 0.7-1, the volume of the second cavity 102 formed by the space between the second vibrating membrane 120 and the face of the driving member 112 away from the first vibrating membrane 111 and the case is small, and the audio output device 100 has excellent bass performance.

[0022] Please refer to Fig. 2. Fig. 2 is a structural schematic diagram of one of the second cavities 102 of the acoustic output device 100 provided by the embodiments of the present application, in some embodiments, the thickness dimension D1 of the second cavity 102 may be less than or equal to 3 mm along the direction H1 from the first side to the second side, preferably the thickness dimension D1 of the second cavity 102 is less than or equal to 2 mm, more preferably the thickness dimension D1 of the second cavity 102 is less than or equal to 1 mm. The thickness dimension of the second cavity 102 may be the maximum distance between the surface of the driving member 112 close to the second vibrating membrane 120 and the second vibrating membrane 120 along the direction H1 from the first side to the second side. Based on the volume formula, when the thickness dimension of the second cavity 102 is less than or equal to 3 mm, the volume of the second cavity 102 is small, and the acoustic output device 100 has excellent bass performance.

[0023] In some embodiments, the first vibration system may be formed by the first vibrating membrane 111 and the voice coil 1123, and the second vibration system may be formed by the second vibrating membrane 120, and the resonant frequency of the second vibration system may be lower than that of the first vibration system so that the acoustic output device 100 has excellent bass performance due to the action of the two vibration systems. For example, in some embodiments, the ratio value of the resonant frequency of the second vibration system to the resonant frequency of the first vibration system may be greater than 0 but less than or equal to 0.7. It is preferable that the ratio value of the resonant frequency of the second vibration system to the resonant frequency of the first vibration system is greater than 0 but less than or equal to 0.6. It is even more preferable that the ratio value of the resonant frequency of the second vibration system to the resonant frequency of the first vibration system is greater than 0 but less than or equal to 0.5.

[0024] In some embodiments, the compliance of the second vibration system is greater than the compliance of the first vibration system, and the value of the ratio between the compliance of the second vibration system and the compliance of the first vibration system is greater than or equal to 1.5. Preferably, the value of the ratio between the compliance of the second vibration system and the compliance of the first vibration system is greater than or equal to 2. More preferably, the value of the ratio between the compliance of the second vibration system and the compliance of the first vibration system is greater than or equal to 3.

[0025] It should be understood that the acoustic output device 100 of the present application may be set so that the ratio between the resonant frequency of the second vibration system and the resonant frequency of the first vibration system is 0.7 or less, or the ratio between the compliance of the second vibration system and the compliance of the first vibration system is 1.5 or more, or the ratio between the resonant frequency of the second vibration system and the resonant frequency of the first vibration system is set so that the ratio between the compliance of the second vibration system and the compliance of the first vibration system is set so that the ratio between the resonant frequency of the second vibration system and the resonant frequency of the first vibration system is 0.7 or less and the ratio between the compliance of the second vibration system and the compliance of the first vibration system is set so that the ratio between the resonant frequency of the second vibration system and the compliance of the first vibration system is 1.5 or more. In this case, the second vibration system has a large compliance (i.e., small elasticity) and a small mass, and the second vibration system can provide a low-frequency resonant frequency for the acoustic output device 100, thereby improving the bass performance of the acoustic output device 100.

[0026] In some embodiments, the mass of the second vibration system may be smaller than the mass of the first vibration system, and the ratio between the mass of the second vibration system and the mass of the first vibration system is less than or equal to 0.7 (greater than 0 but less than or equal to 0.7). Preferably, the ratio between the mass of the second vibration system and the mass of the first vibration system is less than or equal to 0.6, and more preferably, the ratio between the mass of the second vibration system and the mass of the first vibration system is less than or equal to 0.5. In this case, the second vibration system with a small mass can be easily driven by the air spring, thereby providing a low-frequency resonant frequency for the device.

[0027] In some embodiments, the mass of the second vibrating membrane 120 may be smaller than the mass of the first vibrating membrane 111, so that the second vibrating membrane 120 is lighter than the first vibrating membrane 111 and has a smaller mass. In this case, the second vibrating membrane 120 can be easily driven by the air spring sealed in the first cavity 101, and the second vibrating membrane 120 can provide the audio output device 100 with a lower low-frequency resonant frequency than the first vibration system, further improving the bass performance of the audio output device 100.

[0028] In some embodiments, the compliance of the second vibrating membrane 120 may be greater than the compliance of the first vibrating membrane 111, such that the second vibrating membrane 120 is softer than the first vibrating membrane 111, and the second vibrating membrane 120 can provide a lower low-frequency resonant frequency for the acoustic output device 100.

[0029] It should be understood that in the acoustic output device 100 of the present application, the mass of the second vibrating membrane 120 may be set to be smaller than the mass of the first vibrating membrane 111, or the compliance of the second vibrating membrane 120 may be set to be greater than the compliance of the first vibrating membrane 111, or the mass of the second vibrating membrane 120 may be set to be smaller than the mass of the first vibrating membrane 111 and the compliance of the second vibrating membrane 120 may be set to be greater than the compliance of the first vibrating membrane 111.

[0030] In some embodiments, the area of ​​the second diaphragm 120 (e.g., the area of ​​the orthogonal projection of the second diaphragm 120 on a reference plane parallel to the second diaphragm 120) may be equal to or greater than the area of ​​the first diaphragm 111 (e.g., the area of ​​the orthogonal projection of the first diaphragm 111 on a reference plane parallel to the first diaphragm 111), and the ratio of the area of ​​the second diaphragm 120 to the area of ​​the first diaphragm 111 may be equal to or greater than 1 (greater than 1 or equal to 1). Preferably, the ratio of the area of ​​the second diaphragm 120 to the area of ​​the first diaphragm 111 may be equal to or greater than 1.3, and more preferably, the ratio of the area of ​​the second diaphragm 120 to the area of ​​the first diaphragm 111 may be equal to or greater than 1.5. In this case, the second vibrating membrane 120 having a larger area can receive more vibration energy transmitted from the air spring, thereby enabling the second vibrating membrane 120 to further provide the audio output device 100 with a lower low-frequency resonant frequency to a higher extent than the first vibration system, thereby improving the bass performance of the audio output device 100.

[0031] It should be understood that the embodiment of the present application can further improve the bass performance of the sound output device 100 by improving one, two or three elements of the mass, compliance and area of ​​the second diaphragm 120. Even if the area of ​​the second diaphragm 120 is larger than the area of ​​the first diaphragm 111, the mass of the second diaphragm 120 can be made smaller than the mass of the first diaphragm 111 by designing the material of the second diaphragm 120, a locally thinned structure, or the like.

[0032] In the audio output device 100 of the embodiment of the present application, the mass, compliance, area, and other elements of the second vibrating membrane 120 are improved, and the resonant frequency, compliance, mass, and other elements of the first and second vibration systems are improved, so that the second vibrating membrane 120 can receive the vibration energy transmitted from the first vibration system to a higher extent, and the vibration amplitude is also reduced. The second vibrating membrane 120 can provide a lower low-frequency resonant frequency than the first vibration system, thereby improving the bass performance of the audio output device 100, thereby reducing the nonlinear distortion of the audio output device 100 and the earphones 10. At the same time, the first cavity 101 formed by the space between the surface of the second vibrating membrane 120 close to the driving member 112 and the surface of the first vibrating membrane 111 close to the driving member 112 and the case structure 130 is a sealed cavity. Compared with the means in the related art of transmitting sound through a sound guide tube, the dual vibrating membrane vibration system of the present application does not produce frictional noise caused by squeezing the air, and can further improve the sound quality of the audio output device 100.

[0033] Based on the above structure of the acoustic output device 100, please refer to Fig. 1 again. The acoustic output device 100 may further include a third cavity 103.

[0034] The third cavity 103 is formed by the surface of the first vibrating membrane 111 away from the driving member 112 and the case structure 130. For example, the third cavity 103 may be formed by being surrounded by the case structure 130 located on the side of the first vibrating membrane 111 away from the driving member 112 and the first vibrating membrane 111. The case structure 130 may further include at least one first sound output hole 131, which may be disposed in the case structure 130 on the side of the first vibrating membrane 111 away from the driving member 112, and the first sound output hole 131 may penetrate the case structure 130 along the thickness direction of the case structure 130, and the first sound output hole 131 may communicate with the third cavity 103 to realize acoustic coupling. In an operating state, the driving member 112 can drive the vibration of the first vibrating membrane 111 to radiate an acoustic signal to the third cavity 103, and the acoustic signal can be guided to the outside of the acoustic output device 100 via the first sound output hole 131.

[0035] In some embodiments, the case structure 130 may be provided with one or more first sound output holes 131. Please refer to Fig. 3. Fig. 3 is a schematic diagram of one three-dimensional structure of the sound output device 100 provided by the embodiment of the present application. The case structure 130 on the side away from the driving member 112 of the first vibrating membrane 111 may include a protrusion structure 133 and a first surface 134, the protrusion structure 133 may be connected to and protrude from the first surface 134, the protrusion structure 133 may be provided with a first end face 135, and one or more first sound output holes 131 may be formed in the first end face 135. When one first sound output hole 131 is formed on the first end face 135, the cross-sectional area of ​​the first sound output hole 131 may be made large so as to lead out more acoustic signals to the outside of the acoustic output device 100, but when multiple first sound output holes 131 are formed on the first end face 135, the multiple first sound output holes 131 may be provided on the first end face 135 at uniform or non-uniform intervals.

[0036] It should be understood that one or more first sound output holes 131 may be provided in the case structure 130 arranged directly opposite the first vibration membrane 111, or may be provided in the case structure 130 facing or not facing the first vibration membrane 111 side. As shown in FIG. 3, when the audio output device 100 or the earphone 10 is worn by a person, the minimum distance between one edge of the protrusion structure 133 or the first end face 135 (for example, the edge of the protrusion structure 133 or the first end face 135 closer to the ear when the audio output device 100 or the earphone 10 is worn by a person's ear) and the first surface 134 (along the thickness direction H1 of the audio output device 100) along the width direction H2 of the protrusion structure 133 may be made smaller than the minimum distance between the other edge and the first surface 134 (along the thickness direction H1 of the audio output device 100) so that the first end face 135 on which the first sound output hole 131 is arranged is an inclined surface (for example, the first end face 135 in FIG. 3 is an inclined surface lower on the left and higher on the right), and it should be understood that the distance between the first sound output hole 131 and the entrance of the ear canal of the ear is shortened, thereby further improving the acoustic performance of the audio output device 100 and the earphone 10. As shown in Fig. 3, when the sound output device 100 or the earphone 10 is worn by a person along the width direction H2 of the protruding structure 133, the first surface 134 includes a first side close to the ear and a second side away from the ear, and it should be understood that the minimum distance between the projection of the first end face 135 on the first surface 134 and the first side is made smaller than the minimum distance between the projection and the second side so that the first end face 135 is shifted toward the ear (for example, the first end face 135 in Fig. 3 is shifted away from the central axis extending along the length direction of the first surface 134). At this time, the distance between the first sound output hole 131 and the entrance of the ear canal of the ear is shortened, so that the acoustic performance of the sound output device 100 and the earphone 10 can be further improved.

[0037] It should be understood that the one or more first sound holes 131 may be circular, elliptical, polygonal, or other irregular shapes, and the embodiments of the present application are not limited thereto.

[0038] In some embodiments, please refer to Fig. 4. Fig. 4 is a structural schematic diagram of one of the third cavities 103 of the acoustic output device 100 provided by the embodiments of the present application. A part or all of the cavity inner surface of the third cavity 103 may be a first arcuate surface 139. The first arcuate surface 139 in this specification may be an integral arcuate surface or a plurality of spaced arcuate surfaces. For example, the cavity inner surface of the third cavity 103 may include a first surface 136, a second surface 137, and a third surface 138, the first surface 136 and the third surface 138 are disposed opposite to each other, and the second surface 137 may be disposed opposite to the first vibrating membrane 111, and the first surface 136 and the second surface 137, and the second surface 137 and the third surface 138 may be smoothly transitioned and connected via a first arcuate surface 139, where the first arcuate surface 139 may include two spaced apart arcuate surfaces. Of course, in another embodiment, one or more of the first surface 136, the second surface 137, and the third surface 138 may be the first arcuate surface 139.

[0039] It should be understood that the arc radius of the first arcuate surface 139 may be 1.5 millimeters or more, preferably 2 millimeters or more, more preferably 2.5 millimeters or more, and even more preferably 3 millimeters or more. The arc degree of the first arcuate surface 139 may be 30° or more, preferably 40° or more, and even more preferably 45° or more. The present application may implement the above design for either the arc radius or the arc degree of the first arcuate surface 139, or may implement the above design for both the arc radius and the arc degree of the first arcuate surface 139.

[0040] Based on the above structure of the acoustic output device 100, please refer to Figures 1 to 4 again. The acoustic output device 100 may further include a fourth cavity 104.

[0041] A fourth cavity 104 is formed by the surface of the second vibrating membrane 120 away from the electroacoustic transducer 110 and the case structure 130. For example, the fourth cavity 104 can be formed by being surrounded by the case structure 130 on the side of the second vibrating membrane 120 away from the electroacoustic transducer 110 and the second vibrating membrane 120. The case structure 130 further includes at least one second sound output hole 132, which may be disposed in the case structure 130 on the side of the second vibrating membrane 120 away from the electroacoustic transducer 110, and the second sound output hole 132 can penetrate the case structure 130 along the thickness direction of the case structure 130, and the second sound output hole 132 can communicate with the fourth cavity 104 to realize acoustic coupling. In an operating state, the driving member 112 drives the vibration of the first vibrating membrane 111 to move the air spring to vibrate, and also passively vibrates the second vibrating membrane 120 to radiate an acoustic signal into the fourth cavity 104, and the acoustic signal is output to the outside of the audio output device 100 via the first sound output hole 131.

[0042] It should be understood that the case structure 130 may be provided with one or more second sound output holes 132. The one or more second sound output holes 132 may be arranged in the case structure 130 directly opposite the second vibrating membrane 120, diagonally opposite, or not opposite. The one or more second sound output holes 132 may be circular, elliptical, polygonal, or other irregular shapes. The embodiment of the present application is not limited here to the arrangement position and shape of the second sound output hole 132.

[0043] In some embodiments, please refer to Fig. 5. Fig. 5 is a structural schematic diagram of one of the fourth cavities 104 of the acoustic output device 100 provided by the embodiments of the present application. A part or all of the cavity inner surface of the fourth cavity 104 may be the second arcuate surface 143. The second arcuate surface 143 in this specification may be an integral arcuate surface or a plurality of spaced arcuate surfaces. For example, the cavity inner surface of the fourth cavity 104 may include a fourth surface 140, a fifth surface 141, and a sixth surface 142, the fourth surface 140 and the sixth surface 142 are disposed opposite to each other, and the fifth surface 141 may be disposed opposite to the second vibrating membrane 120, and the fourth surface 140 and the fifth surface 141, and the fifth surface 141 and the sixth surface 142 may be smoothly transitioned and connected via a second arc-shaped surface 143, in which case the second arc-shaped surface 143 may include two spaced apart arc-shaped surfaces. Of course, in another embodiment, one or more of the fourth surface 140, the fifth surface 141, and the sixth surface 142 may be the second arc-shaped surface 143.

[0044] It should be understood that the arc radius of the second arcuate surface 143 may be 1.5 millimeters or more, preferably 2 millimeters or more, more preferably 2.5 millimeters or more, and even more preferably 3 millimeters or more. The arc degree of the second arcuate surface 143 may be 30° or more, preferably 40° or more, and even more preferably 45° or more. The present application may implement the above design for either the arc radius or the arc degree of the second arcuate surface 143, or may implement the above design for both the arc radius and the arc degree of the second arcuate surface 143.

[0045] The acoustic output device 100 of the embodiment of the present application may have both a third cavity 103 and a fourth cavity 104, and the third cavity 103 and the fourth cavity 104 may be the front cavity and the rear cavity of the acoustic output device 100, respectively. The acoustic output device 100 radiates sound to the outside through the two cavities and the sound output holes arranged on the cavities, so that the acoustic output device 100 has excellent acoustic generation performance. At the same time, when the inner surfaces of the third cavity 103 and the fourth cavity 104 have an arc-shaped structure, the volumes of the third cavity 103 and the fourth cavity 104 can be reduced and the propagation direction of the acoustic signal in the two cavities can be any direction. As a result, the probability of standing wave energy generation is reduced, and the acoustic output device 100 has better acoustic performance.

[0046] To further reduce the detrimental effects of standing waves, please refer to Fig. 6. Fig. 6 is a second structural schematic diagram of the acoustic output device 100 provided by the embodiment of the present application. The acoustic output device 100 may not include the fourth cavity 104, for example, the case structure 130 may not include the case structure on the side of the second vibrating membrane 120 away from the electro-acoustic transducer 110. In this case, the sound generated by the second vibrating membrane 120 can be directly propagated to the outside of the acoustic output device 100, and the acoustic signal emitted from the second vibrating membrane 120 is less likely to undergo a reflection phenomenon during propagation, thereby reducing the probability of standing wave energy generation.

[0047] Please refer to Fig. 7. Fig. 7 is a schematic diagram of a third structure of an audio output device 100 provided according to an embodiment of the present application, where the audio output device 100 may further include a protective structure 150.

[0048] The protective structure 150 is arranged on the side of the second vibrating membrane 120 opposite the electroacoustic transducer 110, the protective structure 150 can be connected to the case structure 130, and the protective structure 150 is configured to separate the second vibrating membrane 120 from the outside of the acoustic output device 100 and to propagate sound emitted from the second vibrating membrane 120 to the outside of the acoustic output device 100.

[0049] It should be understood that the protective structure 150 may be a filtering mesh structure, for example, the protective structure 150 may be a metal mesh cover, or a plate-like structure having at least one hole structure formed therein.

[0050] The acoustic output device 100 of the embodiment of the present application is provided with a protective structure 150. At this time, the acoustic output device 100 does not form a fourth cavity 104 formed by the surface of the second vibrating membrane 120 facing away from the electroacoustic transducer 110 and the case structure 130. Therefore, the protective structure 150 does not basically play a role of blocking or reflecting the sound emitted from the second vibrating membrane 120. The protective structure 150 mainly plays a role of protecting the second vibrating membrane 120. The acoustic signal emitted from the second vibrating membrane 120 is less likely to cause a standing wave phenomenon during propagation. The second vibrating membrane 120 directly radiates the acoustic signal to the outside of the acoustic output device 100, and can effectively cancel the sound in the far field with the signal emitted from the first sound output hole 131. This can reduce sound leakage from the acoustic output device 100 and the earphones 10.

[0051] 1 to 5, the sound output device 100 of the present application may include the third cavity 103 and the fourth cavity 104, or may include the third cavity 103 but not the fourth cavity 104 as shown in FIG. 6, or may include the third cavity 103 but not the fourth cavity 104 and include the protective structure 150 as shown in FIG. 7. Of course, the sound output device 100 of the embodiment of the present application may include the fourth cavity 104 but not the third cavity 103, or may not include both the third cavity 103 and the fourth cavity 104, or may include the protective structure 150 but not the third cavity 103. The embodiment of the present application does not limit the specific structure of the sound output device 100.

[0052] Please refer to Figures 1 to 7 and 8. Figure 8 is a schematic diagram of a fourth type of structure of an audio output device provided by an embodiment of the present application. The second vibrating membrane 120 of the audio output device 100 of the present application may include a vibrating membrane body 121 and a flat plate-shaped intermediate patch 122.

[0053] The diaphragm body 121 includes an intermediate flat portion 1211 and a folded ring portion 1212 connected in sequence, the folded ring portion 1212 may protrude from the intermediate flat portion 1211 along the side away from the electroacoustic transducer 110, the intermediate flat portion 1211 may be formed within the area surrounded by the folded ring portion 1212, and the second diaphragm 120 and the case structure 130 can be fixedly connected by connecting the folded ring portion 1212 to the case structure 130. The flat intermediate patch 122 is attached to the surface of the intermediate flat portion 1211, and "attached" in this specification means that the flat intermediate patch 122 is arranged in a stack on one side of the surface of the intermediate flat portion 1211 and is connected to the surface, for example, but not limited to, the flat intermediate patch 122 may be adhered to the surface of the intermediate flat portion 1211 away from the electroacoustic transducer 110. At least a portion of the flat intermediate patch 122 may be disposed opposite the intermediate flat portion 1211 , and the orthogonal projection of at least a portion of the flat intermediate patch 122 on the vibration membrane body 121 may overlap with the intermediate flat portion 1211 .

[0054] In some embodiments, the intermediate flat portion 1211 may have a first through hole 123 that may penetrate the intermediate flat portion 1211 along the thickness direction of the intermediate flat portion 1211, and the first through hole 123 contributes to dissipation of heat generated during operation of the electro-acoustic transducer 110.

[0055] In some embodiments, the flat intermediate patch 122 may have a second through hole 124 communicating with the first through hole 123. For example, the second through hole 124 is provided in a region of the flat intermediate patch 122 facing the intermediate flat portion 1211, and the second through hole 124 may be disposed directly opposite the first through hole 123 and communicate with it, and the first through hole 123 may communicate with the fourth cavity 104 through the second through hole 124, and the first through hole 123 and the second through hole 124 further contribute to dissipation of heat generated during the operation of the electro-acoustic transducer 110. Note that the second through hole 124 may be disposed partially offset from the first through hole 123 and communicate with it, and the present application does not limit the specific positions of the second through hole 124 and the first through hole 123.

[0056] In some embodiments, the second diaphragm 120 may include one or two of a first blocking member and a second blocking member. The first blocking member may include a mesh structure, and the first blocking member may be connected to the diaphragm body 121, and the first blocking member may be arranged to match the first through-hole 123 so as to cover the first through-hole 123. It should be understood that the first blocking member may be arranged in the first through-hole 123 (including the case where the first blocking member is arranged at the opening in the intermediate flat portion 1211 of the first through-hole 123), or the first blocking member may be arranged on the side of the intermediate flat portion 1211 away from the flat intermediate patch 122 so as to cover the first through-hole 123. The second blocking member may include a mesh structure, and the second blocking member may be connected to the flat intermediate patch 122, and the second blocking member may be arranged to match the second through-hole 124 so as to cover the second through-hole 124. It should be understood that the second blocking member may be positioned within the second through hole 124 (including the case where it is positioned at the opening in the flat intermediate patch 122 of the second through hole 124), or the second blocking member may be positioned on the side away from the intermediate flat portion 1211 of the flat intermediate patch 122 so as to cover the second through hole 124.

[0057] At least one of the first and second barrier members may be a waterproof gas-permeable membrane or a mesh structure with low air permeability. It should be understood that the waterproof gas-permeable membrane may be prepared using any one of materials such as polytetrafluoroethylene, expandable polytetrafluoroethylene, polyurethane resin, thermoplastic polyurethane elastomer, etc.

[0058] The intermediate flat portion 1211 of the second vibrating membrane 120 of the present application is provided with a first through hole 123, and the flat intermediate patch 122 is provided with a second through hole 124, and the second vibrating membrane 120 further includes a first blocking member covering the first through hole 123 and a second blocking member covering the second through hole 124. In one embodiment, the above structure of the second vibrating membrane 120 can achieve the purpose of waterproofing, and at the same time, can dissipate heat generated during the operation of the electro-acoustic transducer 110, and can also be useful for releasing the pressure of the internal cavity of the acoustic output device 100, and can balance the air pressure of the first cavity 101 and the fourth cavity 104.

[0059] The first vibrating membrane 111 may have a structure similar to that of the second vibrating membrane 120, in which case the sound output device 100 can further dissipate heat generated during operation of the electroacoustic transducer 110 and can balance the air pressures in the third cavity 103 and the fourth cavity 104. The specific structure of the first vibrating membrane 111 is not described in detail in this specification. In the embodiment shown in Figs. 1 to 7, the second vibrating membrane 120 may include a vibrating membrane main body 121 and a flat intermediate patch 122.

[0060] Based on the above sound output device 100, the embodiment of the present application further provides an earphone 10, which may be a wireless earphone structure, a wired earphone structure, an inner-ear type earphone structure, a semi-inner-ear type earphone structure, an earplug type earphone structure, an open type earphone structure, etc. The embodiment of the present application does not limit the specific type of the earphone 10.

[0061] Please refer to Fig. 9 to Fig. 12. Fig. 9 is a structural schematic diagram of one of the earphones 10 provided by the embodiment of the present application, Fig. 10 is a structural schematic diagram of the earphone 10 shown in Fig. 9 in another direction, Fig. 11 is a structural schematic diagram of the earphone 10 shown in Fig. 9 in another direction, and Fig. 12 is a structural schematic diagram of the earphone 10 shown in Fig. 9 in another direction. The earphone 10 can include the sound output device 100 of any one of the above-mentioned embodiments. The earphone 10 can further include a function structure 200, an ear-hanging structure 300, and a transition structure 400, and the sound output device 100 is also called the sound generating structure of the earphone 10.

[0062] Please refer to Figures 9 to 12 and 13. Figure 13 is a schematic diagram of one application scene of the earphone 10 shown in Figure 9. When the earphone 10 is worn by a person, the functional structure 200 may be located behind the pinna of the human ear, and a part of the functional structure 200 may be hidden between the rear side of the pinna and the human head, the so-called rear side of the pinna is the surface of the pinna close to the human head. The ear-hanging structure 300 may be connected to the functional structure 200, and the ear-hanging structure 300 may be connected to the sound-generating structure (i.e., the sound output device 100) through the transition structure 400, the ear-hanging structure 300 can support the earphone 10 to be worn on the pinna, and further, the transition structure 400 and the sound-generating structure (the sound output device 100) can be located in front of the pinna, the so-called front side of the pinna is the surface of the pinna away from the human head.

[0063] It should be understood that the earphone 10 may further include structures such as a battery and a motherboard, which may be disposed in the functional structure 200. Of course, the earphone 10 may further include other structures, such as, but not limited to, a Bluetooth antenna module, a USB charging module, and the embodiments of the present application are not limited thereto.

[0064] For the earphone 10 of the embodiment of the present application, the dual diaphragm vibration sound generating system may be formed by the first diaphragm 111, the driving member 112, the air spring in the first cavity 101, and the second diaphragm 120 of the sound output device 100, and the sound output device 100 has small attenuation in low-frequency sound signals due to the vibration of the two diaphragms. When the volume of the second cavity 102 formed by the second diaphragm 120, the surface of the electro-acoustic transducer 110 close to the second diaphragm 120, and the case structure 130 is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer 110, the volume of the second cavity 102 becomes small, and the second diaphragm 120 can provide the sound output device 100 with a low low-frequency resonant frequency, and the sound output device 100 can provide a low-frequency signal with a wider frequency spectrum, so that the sound output device 100 has excellent bass performance. In addition, the second cavity 102 is a sealed space, and compared with the solution of a sound guide tube, the sound output device 100 of the present application does not produce friction noise caused by squeezing air, which can further improve the sound quality of the sound output device 100. Furthermore, compared with the solution in the related art of arranging two independent electro-acoustic transducers 110, the second diaphragm 120 of the present application is a passive membrane and occupies a small space, which can realize a miniaturized design of the earphone 10 of the present application, and the earphone 10 is more compact and easier to wear.

[0065] Working Example

[0066] As shown in Figures 14-17, an embodiment of the present invention provides an ultra-linear multi-magnetic double diaphragm horn having a first insert pin 1, a second insert pin 2 is provided on one side of the outer wall of the first insert pin 1, the outer walls of the first insert pin 1 and the second insert pin 2 are provided inside a bracket 15, a second copper ring 14 is provided inside the bracket 15, a second FPC 13 is provided on one side of the inner side of the bracket 15, a first FPC 9 is provided on the other side of the inner side of the bracket 15, a first copper ring 8 is provided on the upper surface of the bracket 15, a composite diaphragm 7 is provided on one side of the first copper ring 8, and a composite diaphragm piece 11 is provided inside the bracket 15, and an ultra-linear structure is applied, and the ultra-linear speaker is one in which the frequency response linearity of the horn is relatively excellent.

[0067] A first folded ring 3 is provided inside a first copper ring 8, a magnet 5 is provided above a composite membrane piece 11, and a first washer 6 that provides a cushioning effect is provided on one side of the magnet 5.

[0068] A magnetic guide plate 4 is provided above the magnet 5, and below the first bent ring 3, and the magnet 5 exerts an adsorption effect. A pair of upper and lower first copper rings 8 are provided on the outer wall of the bracket 15, and a first side magnet 17 exerting further adsorption and fixing effects is provided on one side of the inside of the bracket 15.

[0069] A second side magnet 18 is provided on the other side inside the bracket 15, and a second washer 16 is provided above the second side magnet 18 and the first side magnet 17. A second folded ring 19 is provided below the bracket 15, and a symmetrical voice coil 12 is provided above the composite membrane piece 11.

[0070] The ultra-linear multi-magnetic double vibrating membrane horn adopts neodymium iron boron magnetic steel, which is a square multi-magnetic circuit structure obtained by sintering and cutting rare earth materials, and its magnetic field strength is significantly higher than that of ferrite magnetic steel, step 1; Step 2: adopting a composite material as the diaphragm (double diaphragm), the purpose of the composite diaphragm is to improve the rigidity of the diaphragm, reduce the density, and have suitable internal damping; The reason for adopting the ultra-linear structure is that some mobile phone speakers will have a slight change in the sound emitted when muted sound out during use, resulting in distortion. Step 3; and step 4, if the mobile phone uses an ultra-linear speaker, the sound emitted from the mobile phone is not distorted while the speaker is in use.

[0071] Working principle: when the ultra-linear multi-magnetic double vibrating membrane horn needs to be used, firstly, the first insertion pin 1 and the second insertion pin 2 are applied to facilitate installation, then the magnetic guide plate 4 and the magnet 5 are applied to achieve the effect of adsorption, and the device adopts neodymium iron boron magnetic steel, which is a square multi-magnetic circuit structure obtained by sintering and cutting rare earth materials, and its magnetic field strength is significantly higher than that of ferrite magnetic steel, and the device uses a composite material as the vibrating membrane (double vibrating membrane), and the purpose of the composite vibrating membrane is to improve the rigidity of the vibrating membrane, reduce the density, and have suitable internal damping.

[0072] In addition, in describing the embodiments of the present application, the directions or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like are based on the directions or positional relationships shown in the drawings, and are merely intended to facilitate and simplify the description of the present application, and are not intended to indicate or suggest that the devices or components shown must have a specific orientation, be configured, or operate in a specific direction, and therefore should not be construed as limiting the present application.

[0073] In the description of the embodiments of the present application, the terms "first", "second", "third", etc. are used only to distinguish similar objects, and should not be construed as indicating or suggesting the relative importance or the number of technical features shown. Thus, a feature defined by "first", "second", "third" may explicitly or implicitly include one or more of such features. In the description of the present application, "plurality" shall mean two or more, unless otherwise clearly specified.

[0074] In this application, unless otherwise expressly specified and limited, the terms "attach," "couple," "connect," "fix," and the like should be interpreted broadly, for example, connected, detachably connected, or integral, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected so as to be in communication within two components or an interactive relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0075] In this application, a first feature being "above" or "below" a second feature may include direct contact between the first feature and the second feature, or may include contact between the first feature and the second feature through another feature between the first feature and the second feature without direct contact. Furthermore, a first feature being "above," "upper," or "on the top surface" of a second feature may include direct and diagonally above the second feature, or simply mean that the first feature has a higher horizontal height than the second feature. A first feature being "below," "below," or "on the bottom surface" of a second feature may include direct and diagonally below the second feature, or simply mean that the first feature has a lower horizontal height than the second feature.

[0076] In the present application, the description of terms such as "one embodiment," "several embodiments," "examples," "specific examples," or "several examples" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, a general description of the above terms should not be interpreted as necessarily being directed to the same embodiment or example. In addition, the particular features, structures, materials, or characteristics described may be appropriately combined in any one or more embodiments or examples. Furthermore, a person skilled in the art may combine and combine various embodiments or examples described herein.

[0077] The above provides a detailed introduction of the sound output device and earphones provided by the embodiments of the present application, and the present application uses specific examples to explain the principles and embodiments of the present application, but the above examples are only intended to help understand the method and core concept of the present application, and those skilled in the art may make changes to the specific embodiments and application scope in light of the concept of the present application. As described above, the contents of this specification should not be construed as limiting the present application.

[0078] This application claims priority to a Chinese utility model filed with the National Intellectual Property Office of China on October 10, 2023, bearing application number 202322717683.X and entitled "Audio Output Device and Earphone", priority to a Chinese patent application filed with the National Intellectual Property Office of China on February 10, 2023, bearing application number 202310145578.5 and entitled "Ultra-linear multi-magnetic double vibrating membrane horn", and priority to a Chinese utility model filed with the National Intellectual Property Office of China on February 10, 2023, bearing application number 202320184066.5 and entitled "Ultra-linear multi-magnetic double vibrating membrane horn", the entire contents of which are incorporated herein by reference. [Explanation of symbols]

[0079] 10. Earphones 100, audio output device 200, functional structure 300, ear hook structure 400, Transitional Structure 110, electroacoustic transducer 120, second diaphragm 130, case structure 150, protective structure 111, first diaphragm 112, driving member 121, diaphragm body 122, flat intermediate patch 123, first through hole 124, second through hole 131, first sound hole 132, second sound hole 133, protrusion structure 134, first surface 135, first end face 136, first page 137, second side 138, Third Side 139 - the first arcuate surface 140, The Fourth Side 141, The Fifth Side 142, 6th side 143, the second arc surface 1121, Mounting bracket 1122, Magnetic circuit assembly 1123, Voice coil 1211, intermediate plate-like part 1212, folding ring part 101, First Cavity 102, the second cavity 103, the third cavity 104, 4th Cavity 1, first insertion pin 2, the second insertion pin 3. First folding ring 4. Magnetic guide plate 5. Magnet 6. First washer 7. Composite diaphragm 8. First copper ring 9. First FPC 19. Second folding ring 11, Composite membrane piece 12. Voice coil 13. The second FPC 14. Second copper ring 15. Bracket 16, second washer 17, first side magnet 18, second side magnet

Claims

1. 1. An audio output device, comprising: an electro-acoustic transducer including a driving member and a first diaphragm provided on one side of the driving member and connected to the driving member; a second diaphragm provided on a side of the driving member away from the first diaphragm and spaced apart from the electroacoustic transducer; a case structure configured to support the electroacoustic transducer and the second diaphragm, wherein a first cavity is formed by a space between a surface of the second diaphragm close to the driving member and a surface of the first diaphragm close to the driving member and the case structure, and a second cavity is formed by a space between a surface of the electroacoustic transducer close to the second diaphragm and the second diaphragm and the case structure, In an operating state, the driving member drives the vibration of the first vibrating membrane, the first vibrating membrane moves to vibrate an air spring sealed in the first cavity and passively vibrates the second vibrating membrane in accordance with the air spring, and the volume of the second cavity is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer.

2. a third cavity is formed by a surface of the first vibrating membrane away from the driving member and the case structure, and the case structure further includes a first sound output hole acoustically coupled to the third cavity; 2. The acoustic output device of claim 1, wherein in an operating state, the driving member drives the vibration of the first vibrating membrane to radiate an acoustic signal into the third cavity, and the acoustic signal is guided to the outside of the acoustic output device via the first sound output hole.

3. The acoustic output device according to claim 2 , wherein a part or all of the inner cavity surface of the third cavity is the first arcuate surface.

4. a fourth cavity is formed by a surface of the second diaphragm away from the electroacoustic transducer and the case structure, and the case structure further includes a second sound output hole acoustically coupled to the fourth cavity; 2. The acoustic output device of claim 1, wherein in an operating state, the second vibrating membrane passively vibrates in accordance with the air spring to radiate an acoustic signal into the fourth cavity, and the acoustic signal is guided to the outside of the acoustic output device via the second sound output hole.

5. The acoustic output device according to claim 4 , wherein a part or all of the inner cavity surface of the fourth cavity is the second arcuate surface.

6. The sound output device is The acoustic output device of claim 1, further comprising a protective structure provided on the side of the second diaphragm opposite the electro-acoustic transducer, separating the second diaphragm from the outside of the acoustic output device and configured to allow sound emitted from the second diaphragm to propagate to the outside of the acoustic output device.

7. The second vibrating membrane includes: a diaphragm body including a connected intermediate flat portion and a folded ring portion; a flat intermediate patch attached to a surface of the intermediate flat portion; The sound output device according to claim 1 , wherein a first through hole is provided in the intermediate flat portion.

8. The sound output device according to claim 7 , wherein the flat intermediate patch is provided with a second through hole communicating with the first through hole.

9. The second vibrating membrane further includes at least one of a first blocking member and a second blocking member, The first blocking member is connected to the vibration membrane body in a mesh structure, and the first blocking member is arranged to match the first through hole and cover the first through hole, The acoustic output device of claim 8 , wherein the second blocking member includes a mesh structure and is connected to the flat intermediate patch, and the second blocking member is positioned in alignment with the second through hole so as to cover the second through hole.

10. 2. The acoustic output device of claim 1, wherein the distance between the second diaphragm and a surface of the electro-acoustic transducer closest to the second diaphragm is 3 millimeters or less along the direction in which the first diaphragm, the driving member, and the second diaphragm are arranged.

11. a projection portion of the electro-acoustic transducer where a first orthogonal projection on a first reference plane parallel to the first diaphragm and a second orthogonal projection of the second diaphragm on the first reference plane overlap has a first area; The acoustic output device of claim 1, wherein the projection having a larger area between the first orthogonal projection and the second orthogonal projection has a second area, and a value of a ratio between the first area and the second area is between 0.7 and 1.

12. 2. The acoustic output device of claim 1, wherein the ratio between the area of ​​the second vibrating membrane and the area of ​​the first vibrating membrane is 1 or more, and / or the mass of the second vibrating membrane is smaller than the mass of the first vibrating membrane, and / or the compliance of the second vibrating membrane is greater than the compliance of the first vibrating membrane.

13. the driving member includes a voice coil, the voice coil is connected to the first vibrating membrane, the first vibrating membrane and the voice coil form a first vibration system, and the second vibrating membrane forms a second vibration system; The acoustic output device according to claim 1 , wherein a ratio between the resonant frequency of the second vibration system and the resonant frequency of the first vibration system is equal to or less than 0.

7.

14. 14. The acoustic output device of claim 13, wherein a ratio between the compliance of the second vibration system and the compliance of the first vibration system is 1.5 or more, and / or a ratio between the mass of the second vibration system and the mass of the first vibration system is 0.7 or less.

15. An earphone including an audio output device, the audio output device comprising: an electro-acoustic transducer including a driving member and a first diaphragm provided on one side of the driving member and connected to the driving member; a second diaphragm provided on a side of the driving member away from the first diaphragm and spaced apart from the electroacoustic transducer; a case structure configured to support the electroacoustic transducer and the second diaphragm, wherein a first cavity is formed by a space between a surface of the second diaphragm close to the driving member and a surface of the first diaphragm close to the driving member and the case structure, and a second cavity is formed by a space between a surface of the electroacoustic transducer close to the second diaphragm and the second diaphragm and the case structure, In an operating state, the driving member drives the vibration of the first diaphragm, the first diaphragm moves an air spring sealed in the first cavity to vibrate, and passively vibrates the second diaphragm in accordance with the air spring, and the volume of the second cavity is 1 / 5 or less of the equivalent volume of the electro-acoustic transducer.

16. An ultra-linear multi-magnetic double-membrane horn comprising a bracket, a second copper ring provided inside the bracket, a first copper ring provided on an upper surface of the bracket, a composite membrane provided on one side of the first copper ring, and a composite membrane piece provided inside the bracket.

17. The ultra-linear multi-magnetic double vibrating membrane horn of claim 16, wherein a first folded ring is provided inside the first copper ring, a magnet is provided above the composite membrane piece, a first washer is provided on one side of the magnet, a magnetic guide plate is provided above the magnet, and the magnetic guide plate is provided below the first folded ring.

18. The ultra-linear multi-magnetic double vibrating membrane horn of claim 16, wherein a pair of first copper rings, one above the other, are provided on the outer wall of the bracket, a first side magnet is provided on one side of the interior of the bracket, a second side magnet is provided on the other side of the interior of the bracket, and a second washer is provided above the second side magnet and the first side magnet.

19. 17. The super-linear multi-magnetic dual membrane horn as claimed in claim 16, wherein a second folded ring is provided below said bracket, and a symmetrical voice coil is provided above said composite membrane piece.

20. The ultra-linear multi-magnetic double-membrane horn of claim 16, wherein the magnetic circuit structure of the ultra-linear multi-magnetic double-membrane horn is a rectangular multi-magnetic circuit structure, and the rectangular multi-magnetic circuit structure includes neodymium iron boron magnetic steel made by sintering and cutting rare earth element materials.

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