Circuit and sound generating device

Abstract

The present invention provides a circuit and a sound generating device. [Solution] The circuit includes a first audio signal input terminal, a second audio signal input terminal, a power amplifier, a capacitor, a low-frequency sound module, and a high-frequency sound module, the first audio signal input terminal is used for receiving a sound signal having high and low tones, the second audio signal input terminal is used for receiving a speech signal, the first audio signal input terminal is connected to the positive input terminal of the power amplifier, the negative input terminal of the power amplifier is connected to ground, the output terminal of the power amplifier is respectively connected to the input terminal of the low-frequency sound module and the first terminal of the capacitor, the second terminal of the capacitor is connected to the first input terminal of the high-frequency sound module, and the second audio signal input terminal is connected to the second input terminal of the high-frequency sound module. The sound device is applied with the above circuit provided by the present invention. Compared with the prior art, the power amplifier adopting the technical solution of the present invention is less in number, has a simple structure, and has a wide range of applications.

Description

[Technical Field]

[0001] The present invention relates to the field of electro-acoustic conversion, and more particularly to circuits and sound-generating devices applied in portable mobile electronic products. [Background technology]

[0002] Sound generating devices are widely used in mobile phones and other portable electronic products to convert audio signals into sounds and play them back. The loudness of the sound generating devices is large, and the effect of low-frequency and high-frequency sounds is strong. The circuits for driving the sound generating devices are also an important part of portable mobile electronic products.

[0003] In the prior art, a sound generating device circuit includes a plurality of sound generating devices, a power amplifier, and a capacitor.

[0004] However, in the sound device circuit of the prior art, multiple sound devices are required for application in terminal equipment. For example, a mobile phone requires multiple sound devices to produce low-frequency and high-frequency sounds and to be used as a handset. As shown in Figure 1, Figure 1 is a configuration block diagram of an application scenario of a sound device of the prior art in a terminal device, where a power amplifier P1 is used to produce low-frequency and high-frequency sounds. In a specific application, a music signal device S1 splits a music signal into two signals through the power amplifier P1, one of which is sent directly to a bass speaker U1 and the other to a treble speaker U2 via a series-connected capacitor C, and the audio signal device S2 also sends an audio signal to a receiver U3. In this application scenario, the treble speaker U2 and the receiver U3 are two independent speakers with separate drivers. As shown in Figure 2, which is a configuration block diagram of another application scenario in a terminal device of a conventional sound device, the music signal device S1 transmits its music signal to the bass speaker U1 via the power amplifier P1, the music signal device S2 transmits its music signal to the bass speaker U2 via the power amplifier P2 and capacitor C connected in series, and the audio signal device S2 transmits the audio signal to the receiver U3. In this application scenario, the bass speaker U, the treble speaker U2, and the receiver U3 are three independent speakers with separate drivers, requiring at least two power amplifiers. The above technical solutions require many devices, making the driving circuits complex and inconvenient for integrated applications.

[0005] Therefore, it is necessary to provide a new circuit and sound generating device to solve the above technical problems. Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit and a sound generating device which have a small number of power amplifiers, a simple structure, and are widely applicable. [Means for solving the problem]

[0007] In order to achieve the above object, in a first aspect, the present invention provides a circuit applicable to a sound generation device, the circuit including a first audio signal input terminal, a second audio signal input terminal, a power amplifier, a capacitor, a low-frequency sound generation module, and a high-frequency sound generation module, wherein the first audio signal input terminal is used to receive a sound signal having high and low tones, the second audio signal input terminal is used to receive a speech signal, the first audio signal input terminal is connected to the positive input terminal of the power amplifier, the negative input terminal of the power amplifier is connected to ground, the output terminal of the power amplifier is respectively connected to the input terminal of the low-frequency sound generation module and the first terminal of the capacitor, the second terminal of the capacitor is connected to the first input terminal of the high-frequency sound generation module, and the second audio signal input terminal is connected to the second input terminal of the high-frequency sound generation module.

[0008] In a second aspect, the present invention provides a sound generation device, to which the above-mentioned circuit provided by the present invention is applied, the sound generation device including a first vibration system for vibrating to generate low-pitched sounds and a second vibration system for vibrating to generate high-pitched sounds, the second vibration system being capable of functioning as a receiver to generate sounds, wherein the output end of the power amplifier is connected to the first vibration system, and the second end of the capacitor and the second audio signal input terminal are both connected to the second vibration system.

[0009] Preferably, the sound-producing device further includes a frame and a magnetic circuit system fixed to the frame, the first vibration system and the second vibration system being coaxially installed and located on opposite sides of the magnetic circuit system, the first vibration system including a first diaphragm fixed to the frame and a first voice coil fixed to the first diaphragm, the second vibration system including a second diaphragm fixedly supported by the magnetic circuit system and a second voice coil that drives the second diaphragm to vibrate and emit sound, the magnetic circuit system including a first magnetic gap and a second magnetic gap, the first magnetic gap being arranged to surround the second magnetic gap, the first voice coil being inserted in the first magnetic gap and driving the first diaphragm to vibrate and emit low-pitched sounds, and the second voice coil being inserted in the second magnetic gap and driving the second diaphragm to vibrate and emit high-pitched sounds.

[0010] Preferably, the magnetic circuit system includes a yoke, a main magnet steel assembly fixed to a side of the yoke close to the first diaphragm, and a sub-magnet steel assembly surrounding the main magnet steel assembly, the sub-magnet steel assembly and the main magnet steel assembly being spaced apart to form the first magnetic gap, the yoke being annular, the main magnet steel assembly including a main magnet steel having an annular shape, a main magnetic pole core fixed to cover a side of the main magnet steel away from the yoke, and sub-magnet steel, and the inner wall of the main magnet steel and the inner wall of the yoke are both insulated. the main pole core includes a main pole core body fixed to the main magnet steel, and a main pole core protrusion portion bent from the inner peripheral edge of the main pole core body and extending into the inner cavity, the auxiliary magnet steel is fixed so as to cover the side of the main pole core body away from the yoke, the main magnet steel and the yoke together surround the main pole core protrusion portion and are spaced apart from the main pole core protrusion portion to form the second magnetic gap with an opening facing the second vibration system, and the main pole core protrusion portion has a hollow annular shape.

[0011] Preferably, the sound-producing device further includes an annular support frame, the support frame being fixed to the side of the yoke away from the frame, the peripheral edge of the second diaphragm being supported and fixed to the side of the support frame away from the yoke, the magnetic circuit system and the second vibration system together surrounding and forming a bottom cavity, and the bottom cavity communicating with the second magnetic gap.

[0012] Preferably, the second diaphragm includes a second diaphragm vibration portion spaced apart from the yoke, a second diaphragm surround portion that bends and extends from the outer peripheral edge of the second diaphragm vibration portion, and a second diaphragm connection portion that bends and extends from the second diaphragm surround portion to the support frame, the second diaphragm connection portion being fixed to the support frame, and the second vibration system further includes a second bobbin, the side of the second bobbin closer to the magnetic circuit system being fixed to the second voice coil and the side of the second bobbin away from the magnetic circuit system being fixed to the second diaphragm vibration portion.

[0013] Preferably, the second bobbin includes a first fixed portion having an annular shape, a resilient arm that bends and extends from the inside of the first fixed portion, and a second fixed portion that extends from the resilient arm in a direction away from the first fixed portion, the second diaphragm connection portion and the support frame are fixed to opposite sides of the first fixed portion, the second diaphragm vibrating portion and the second voice coil are fixed to opposite sides of the second fixed portion, and the sub-magnet steel assembly is fixed to the yoke 5. the second bobbin further includes a third fixed portion that bends and extends from the outside of the first fixed portion toward the frame, the sub-pole core is fixed to the frame, and the third fixed portion is fixed to the side of the sub-pole core that is away from the frame, the frame is rectangular, and there are two sub-pole cores, and the two sub-pole cores are located on opposite sides of the long axis of the frame.

[0014] Preferably, the first diaphragm has an annular shape, an inner circumferential side of the first diaphragm is fixed to the auxiliary magnet steel, and an outer circumferential side of the first diaphragm is fixed to the frame.

[0015] Preferably, the first vibration system further includes a first bobbin having an annular shape, the first voice coil is fixed to a side of the first bobbin closer to the magnetic circuit system, the first diaphragm includes a first surround having an annular shape and a second surround having an annular shape, the first surround is arranged to surround the second surround and is spaced apart from the second surround, the second surround is arranged to surround the auxiliary magnet steel, the inner peripheral side of the second surround is fixed to the outside of the auxiliary magnet steel, the first bobbin functions as a dome of the first diaphragm, the outer peripheral side of the first bobbin is fixed to the inner peripheral side of the first surround, the inner peripheral side of the first bobbin is fixed to the outer peripheral side of the second surround, and the outer peripheral side of the first surround is fixed to the frame.

[0016] Preferably, the first bobbin includes a first portion having an annular shape, a second portion that bends and extends from the inner circumferential side of the first portion toward the first voice coil, and a third portion that bends and extends from the inner circumferential side of the first portion toward the yoke, the first voice coil is fixed to a side of the second portion closer to the yoke and a side of the second portion away from the yoke is fixed to an outer circumferential side of the second surround, the first vibration system further includes an elastic support assembly installed at a distance from the first surround, one end of the elastic support assembly is fixed to the frame and the other end of the elastic support assembly is fixed to the third portion. [Effects of the Invention]

[0017] Compared with the prior art, the circuit of the present invention is applied to a sound generating device, and is connected to the positive input terminal of the power amplifier via a first audio signal input terminal having high and low tones. The power amplifier then splits the signal into two signals, high and low, with the split low-pitched signal being directly input to the low-frequency sound generating module to generate sound, and the split high-pitched signal being connected in series with the capacitor and then input to the high-frequency sound generating module to generate sound. This structure allows the low-frequency sound generating module to generate low tones and the high-frequency sound generating module to generate high tones. In the circuit of the present invention, a speech signal is input to the second input terminal of the high-frequency sound generating module via the second audio signal input terminal. When the high-frequency sound generating module of the present invention is used as a receiver, the low-frequency sound generating module can function as an anti-phase noise canceling device. The circuit of the present invention can achieve multiple application functions with just one power amplifier, and has a simple structure and a wide range of applications. [Brief explanation of the drawings]

[0018] In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings necessary for the description of the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without inventive work, among which: [Figure 1] FIG. 1 is a block diagram of one application scenario of a circuit of the related art in a terminal device. [Figure 2] FIG. 2 is a block diagram of another application scenario of the circuit of the related art in a terminal device. [Figure 3] FIG. 3 is a diagram showing the configuration of a circuit according to the present invention. [Figure 4] FIG. 4 is a perspective view showing the configuration of the sound producing device according to the present invention. [Figure 5] FIG. 5 is an exploded schematic diagram of a partial three-dimensional configuration of the sound producing device according to the present invention. [Figure 6] FIG. 6 is an exploded schematic view of a partial three-dimensional configuration of the sound producing device according to the present invention, seen from another angle. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. [Figure 8] FIG. 8 is an enlarged view of a portion B in FIG. [Figure 9] FIG. 9 is a diagram showing the assembly of a three-dimensional configuration of the main magnet steel assembly, the sub-magnet steel assembly, and the first voice coil of the sound producing device according to the present invention. [Figure 10] FIG. 10 is a diagram showing the assembly of the three-dimensional configuration of the yoke, main pole core protrusion, and second voice coil of the sound generating device according to the present invention. [Figure 11] FIG. 11 is a diagram showing the three-dimensional configuration of the main magnet steel assembly of the sound producing device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by those skilled in the art without inventive work based on the embodiments of the present invention shall fall within the protection scope of the present invention.

[0020] The present invention provides a circuit 200 and a sound generating device 100, wherein the circuit 200 is applied to the sound generating device 100.

[0021] The circuit 200 includes a first audio signal input terminal IN1, a second audio signal input terminal IN2, a power amplifier 201, a capacitor 202, a low-frequency sound generation module 101, and a high-frequency sound generation module .

[0022] The first audio signal input terminal IN1 is used to receive an audio signal having high and low tones, such as a music signal.

[0023] The second audio signal input terminal IN2 is used to receive a speech signal.

[0024] The low-frequency sound module 101 is used to generate low-frequency sounds.

[0025] The high frequency sound module 102 is used to generate high frequency sounds, and also functions as a receiver to generate sounds.

[0026] As shown in Fig. 3, Fig. 3 is a diagram showing the configuration of a circuit 200 according to the present invention. The circuit connection relationship of the circuit 200 is as follows: The first audio signal input terminal IN1 is connected to the positive input terminal of the power amplifier 201. The negative input terminal of the power amplifier 201 is connected to ground. The output terminal of the power amplifier 201 is connected to the input terminal of the low-frequency sound module 101 and the first terminal of the capacitor. The second terminal of the capacitor is connected to the first input terminal of the high-frequency sound module 102, and the second audio signal input terminal IN2 is connected to the second input terminal of the high-frequency sound module 102.

[0027] The working principle of the circuit 200 is as follows. The first audio signal input terminal IN1 splits a music signal having high and low tones into two signals after passing through a power amplifier 201. One signal is directly sent to the input terminal of the low-frequency sound generation module 101, causing the low-frequency sound generation module 101 to generate a low-frequency sound. The other signal is sent to the first input terminal of the high-frequency sound generation module 102 via a series-connected capacitor 202, causing the high-frequency sound generation module 102 to generate a high-frequency sound. The second audio signal input terminal IN2 directly sends a speech signal to the second input terminal of the high-frequency sound generation module 102. When the high-frequency sound generation module 102 is used as a receiver, the low-frequency sound generation module 101 can also be used as an anti-phase noise reduction device. Therefore, the circuit 200 of the present invention can achieve multiple application functions with only one power amplifier, has a simple structure, and is applicable in a wide range of applications.

[0028] The present invention further provides the sound production device 100 to which the circuit 200 is applied. Specifically, the sound production device 100 includes a frame 10, a first vibration system 20 fixed to the frame 10 and vibrating to produce low-pitched sounds, a second vibration system 30 fixed to the frame 10 and vibrating to produce high-pitched sounds, and a magnetic circuit system 40 fixed to the frame 10.

[0029] Here, the first vibration system 20 and the second vibration system 30 are installed coaxially and are respectively located on opposite sides of the magnetic circuit system 40. With this structure, the second vibration system 30 can be installed on the rear side of the first vibration system 20 to generate sound, and the first vibration system 20 and the second vibration system 30 can achieve coaxial generation of sound over the entire frequency band, thereby improving the acoustic effect of the circuit 200 of the present invention.

[0030] At the same time, the second vibration system 30 can also function as a receiver to emit sound. Specifically, the second vibration system 30 can be combined with the magnetic circuit system 40 to function as a receiver, and the speaker formed by the first vibration system 10 and the magnetic circuit system 40 can thus function as an anti-phase noise reduction device.

[0031] In this embodiment, the first vibration system 20 and the magnetic circuit system 40 form the low-frequency sound generation module 101. The second vibration system 30 and the magnetic circuit system 40 form the high-frequency sound generation module .

[0032] In this embodiment, the circuit connection relationship of the circuit 200 applied to the sound generation device 100 is as follows. The first audio signal input terminal IN1 is connected to the positive input terminal of the power amplifier 201, and the negative input terminal of the power amplifier 201 is connected to ground; The output terminal of the power amplifier 201 is respectively connected to the first input terminal of the sound generating device 100 and the first terminal of the capacitor 202; The second end of the capacitor 202 is connected to the second input end of the sound generating device 100; The second audio signal input terminal IN2 is connected to the third input terminal of the sound generating device 100; Here, the first input terminal of the sound-producing device 100 is connected to the first vibration system 20 , and the second input terminal of the sound-producing device 100 and the third input terminal of the sound-producing device 100 are both connected to the second vibration system 30 .

[0033] In this embodiment, the working principle of the circuit 200 applied to the sound generating device 100 is as follows. The first audio signal input terminal IN1 splits a music signal having high and low tones into two signals after passing through a power amplifier 201, one of which is sent directly to a bass speaker formed by the magnetic circuit system 40 of the sound production device 100 and the second vibration system 20, and the other is sent via a series-connected capacitor 202 to a treble speaker formed by the magnetic circuit system 40 of the sound production device 100 and the second vibration system 30. In addition, the second audio signal input terminal IN2 sends a speech signal directly to a treble speaker formed by the magnetic circuit system 40 of the sound production device 100 and the second vibration system 30. When the speaker formed by the second vibration system 30 and the magnetic circuit system 40 of the sound production device is used as a receiver, the speaker formed by the first vibration system 20 and the magnetic circuit system 40 can be an anti-phase noise canceling device. Therefore, the circuit 200 of the present invention can realize multiple application functions with only one power amplifier, and has a simple structure and a wide range of applications.

[0034] In this embodiment, as shown in Figures 4 to 11, the sound production device 100 includes the frame 10, and the first vibration system 20, the second vibration system 30, the magnetic circuit system 40, and a front cover 50, which are each fixed to the frame 10.

[0035] The frame 1 has an annular shape.

[0036] The first vibration system 20 includes a first diaphragm 1 fixed to the frame 10, a first voice coil 201 fixed to the first diaphragm 1, a first bobbin 2 having an annular shape, and an elastic support assembly 202. The first voice coil 201 is fixed to the side of the first bobbin 2 that is closer to the magnetic circuit system 40.

[0037] The second vibration system 30 is installed at a distance from the first vibration system 20 on the side of the magnetic circuit system 40 that is away from the first vibration system 20. The second vibration system 30 includes a second diaphragm 3 fixedly supported by the magnetic circuit system 40, a second voice coil 301 that drives the second diaphragm 3 to vibrate and generate sound, and a second bobbin 4.

[0038] The magnetic circuit system 40 includes a yoke 5, a main magnet steel assembly 6 fixed to the side of the yoke 5 closer to the first diaphragm 1, and a sub-magnet steel assembly 7 surrounding the main magnet steel assembly 6.

[0039] The yoke 5 has an annular shape. The second diaphragm 3 is disposed at a distance from the yoke 5.

[0040] The main magnet steel assembly 6 includes an annular main magnet steel 61 and a main magnetic pole core 62 fixed so as to cover the side of the main magnet steel 61 that faces away from the yoke 5. The inner wall of the main magnet steel 61 and the inner wall of the yoke 5 together surround and form an inner cavity 402.

[0041] The magnetic circuit system 40 includes a first magnetic gap 401 and a second magnetic gap 403, and the first magnetic gap 401 is provided to surround the second magnetic gap 403. In this embodiment, the second magnetic gap 403 is provided on the side of the magnetic circuit system 40 that is away from the first vibration system 20. Specifically, the main pole core 62 includes a main pole core body 621 fixed to the main magnet steel 61, and a main pole core protrusion 622 that bends from the inner peripheral edge of the main pole core body 621 and extends into the inner cavity 402. The main magnet steel 61 and the yoke 5 together surround the main pole core protrusion 622 and are spaced apart from the main pole core protrusion 622, thereby forming the second magnetic gap 403 whose opening faces the second vibration system 30. The second voice coil 301 is inserted into the second magnetic gap 403 and drives the second diaphragm 3 to vibrate and generate sound. Thus, the second vibration system 30 and the magnetic circuit system 40 form a high-pitched speaker, and the sound-generating device 100 realizes the function of providing high-pitched sound effects and can also be used as a receiver. Therefore, the circuit 200 has a simple structure and a wide range of applications.

[0042] The sub-magnetic steel assembly 7 and the main magnetic steel assembly 6 are spaced apart to form the first magnetic gap 401. The first voice coil 201 is inserted into the first magnetic gap 401 and drives the first diaphragm 1 to vibrate and generate sound. With this structure, the first voice coil 201 of the first vibration system 20 is inserted into the first magnetic gap 401 and drives the first diaphragm 1 to vibrate and generate low-frequency sound, and the first vibration system 20 and the magnetic circuit system 40 form a bass speaker, so that the sound-generating device 100 can provide a bass sound effect function. The circuit 200 has good acoustic performance and a wide range of applications.

[0043] The second diaphragm 3 and the first diaphragm 1 are respectively provided on opposite sides of the sound producing device 100. The second voice coil 301 and the first voice coil 201 are installed coaxially. With this structure, the second vibration system 30 of the formed treble speaker is installed behind the first vibration system 20 of the formed woofer to generate sound, and the first vibration system 20 and the second vibration system 30 can achieve coaxial full-frequency sound production, thereby improving the acoustic performance of the sound producing device 100 of the present invention. When the treble speaker formed by the second vibration system 30 and the magnetic circuit system 40 of the sound producing device 100 of the present invention is used as a receiver, the woofer formed by the first vibration system 20 and the magnetic circuit system 40 can be used as an anti-phase noise reduction device. In addition, the circuit 200 of the present invention can achieve multiple application functions with only one power amplifier, so the circuit 200 has a simple structure and a wide range of applications.

[0044] In this embodiment, the main pole core 62 has a through hole 620 that passes through it, and the through hole 620 passes through the main pole core body 621 and the main pole core protrusion 622 in that order. The provision of the through hole 620 allows the main pole core 62 to be hollow, and the main pole core protrusion 622 extends to the inner cavity 402, so that the through hole 620 communicates with the inner cavity 402 to form a large cavity that improves the high-frequency performance of the sound producing device 100. This structure is advantageous for improving the acoustic performance of the treble speaker formed by the second vibration system 30 and the magnetic circuit system 40, and also provides excellent acoustic performance as a receiver.

[0045] In this embodiment, in order to strengthen the magnetic field of the main magnet steel assembly 6, the main magnet steel assembly 6 further includes an auxiliary magnet steel 63 fixed to cover the side of the main pole core body 621 that is away from the yoke 5. By sealing the middle hole 620 with the auxiliary magnet steel 63, the treble speaker formed by the second vibration system 30 and the magnetic circuit system 40 has excellent acoustic performance, and the acoustic performance when used as a receiver is also excellent.

[0046] In this embodiment, the first diaphragm 1 has an annular shape. An inner circumferential side of the first diaphragm 1 is fixed to the auxiliary magnet steel 63. An outer circumferential side of the first diaphragm 1 is fixed to the frame 10. Specifically, the first diaphragm 1 includes an annular first surround 11 and an annular second surround 12. The first surround 11 is disposed so as to surround the second surround 12 and is spaced apart from the second surround 12. The second surround 12 is disposed so as to surround the auxiliary magnet steel 63. An inner circumferential side of the second surround 12 is fixed to the outside of the auxiliary magnet steel 63. The first bobbin 2 functions as a dome for the first diaphragm 1, and an outer circumferential side of the first bobbin 2 is fixed to an inner circumferential side of the first surround 11, and an inner circumferential side of the first bobbin 2 is fixed to an outer circumferential side of the second surround 12. The outer periphery of the first surround 11 is fixed to the frame 10. With this structure, the thickness of the sound generating device 100 in the present invention reuses the height of the magnetic circuit system 40, and the first diaphragm 1 of the first vibration system 20 is disposed outside the auxiliary magnetic steel 63, thereby reducing the thickness of the sound generating device 100 occupied by the woofer of the first vibration system 20 and the magnetic circuit system 40, while increasing the size of the woofer, thereby improving the acoustic performance of the bass side of the sound generating device 100. The circuit 200 has excellent acoustic performance and a wide range of applications.

[0047] In this embodiment, the side of the first bobbin 2 closer to the magnetic circuit system 40 is fixed to the first voice coil 201. Specifically, the first bobbin 2 includes an annular first portion 21, a second portion 22 bending and extending from the inner periphery of the first portion 21 toward the first voice coil 201, and a third portion 23 bending and extending from the inner periphery of the first portion 21 toward the yoke 5. The first voice coil 201 is fixed to the side of the second portion 22 closer to the yoke 5. The side of the second portion 22 away from the yoke 5 is fixed to the outer periphery of the second surround 12. The structure of the first bobbin 2 reduces the thickness of the sound generation device 100, increases the size of the bass speaker, and improves the bass acoustic performance of the sound generation device 100. The circuit 200 has excellent acoustic performance and a wide range of applications.

[0048] In this embodiment, the first vibration system 20 further includes an elastic support assembly 202 spaced apart from the first surround 11. One end of the elastic support assembly 202 is fixed to the frame 10. The other end of the elastic support assembly 202 is fixed to the third part 23. The elastic support assembly 202 enhances the vibration effect of the first diaphragm 1 and improves the acoustic performance of the sound production device 100, while balancing the swing of the first vibration system 20 and improving the stability of the sound production device 100. The sound production device 100 has excellent acoustic performance and a wide range of applications.

[0049] In this embodiment, the frame 10 has a rectangular shape. There are two elastic support assemblies 202. The two elastic support assemblies 202 are located on opposite sides of the minor axis of the frame 10. The two elastic support assemblies 202 are symmetrically distributed, which provides more stable support for the first voice coil 201 and better vibration reliability.

[0050] In this embodiment, the sound producing device 100 further includes an annular support frame 60. The support frame 60 is fixed to the side of the yoke 5 that faces away from the frame 10. The periphery of the second diaphragm 3 is supported and fixed to the side of the support frame 60 that faces away from the yoke 5.

[0051] The magnetic circuit system 40 and the second vibration system 30 together surround and form a bottom cavity 404. The bottom cavity 404 communicates with the second magnetic gap 403.

[0052] Specifically, the support frame 60 is provided with a leak hole 600 passing therethrough. The bottom cavity 404 is in communication with the outside through the leak hole 600. The provision of the leak hole 600 helps to balance the air pressure between the bottom cavity 404 and the outside, thereby improving the acoustic performance of the high-frequency speaker formed by the magnetic circuit system 40 and the second vibration system 30 and enabling it to be more effectively converted into a receiver. Thus, the sound producing device 100 has excellent acoustic performance and a wide range of applications.

[0053] In this embodiment, the second diaphragm 3 includes a second diaphragm vibrating portion 31 spaced apart from the yoke 5, a second diaphragm surround portion 32 that bends and extends from the outer periphery of the second diaphragm vibrating portion 31, and a second diaphragm connecting portion 33 that bends and extends from the second diaphragm surround portion 32 to the support frame 60. The second diaphragm connecting portion 33 is fixed to the support frame 60.

[0054] A side of the second bobbin 4 closer to the magnetic circuit system 40 is fixed to the second voice coil 301. A side of the second bobbin 4 away from the magnetic circuit system 40 is fixed to the second diaphragm vibrating part 31. Specifically, the second bobbin 4 includes a first fixed part 41 having an annular shape, an elastic arm 42 bending and extending from the inside of the first fixed part 41, and a second fixed part 43 extending from the elastic arm 42 in a direction away from the first fixed part 41.

[0055] Here, the second diaphragm connecting part 33 and the support frame 60 are fixed to opposite sides of the first fixed part 41. The second diaphragm vibrating part 31 and the second voice coil 301 are fixed to opposite sides of the second fixed part 43. The structure of the second bobbin 4 fixes the second diaphragm 3 to the support frame 60 and the second voice coil 301, respectively, which favors the elasticity of the elastic arm 42 of the second bobbin 4, strengthens the vibration effect of the second diaphragm vibrating part 31, improves the reliability of the second diaphragm vibrating part 31, and improves the stability and acoustic performance of the sound generating device 100. The circuit 200 has excellent acoustic performance and a wide range of applications.

[0056] In this embodiment, the secondary magnet steel assembly 7 includes a secondary magnet steel 71 fixed to the yoke 5, and a secondary magnetic pole core 72 fixed so as to cover the side of the secondary magnet steel 71 facing away from the yoke 5.

[0057] The second bobbin 4 further includes a third fixing portion 44 that is bent and extends from the outer side of the first fixing portion 41 toward the frame 10 .

[0058] The sub-pole core 72 is fixed to the frame 10. The third fixing portion 44 is fixed to the side of the sub-pole core 72 that faces away from the frame 10. Here, the frame 10 has a rectangular shape. There are two sub-pole cores 72. The two sub-pole cores 72 are located on opposite sides of the longitudinal axis of the frame 10. This structure is advantageous for fixing the second diaphragm 3 to the frame 10, and can improve the stability and acoustic performance of the sound generation device 100.

[0059] The front cover 50 is fixed to cover the second diaphragm 3 and, together with the second diaphragm 3, surrounds a front sound cavity 51. The front cover 50 has a front sound hole 52 passing therethrough. The front sound cavity 51 communicates with the outside through the front sound hole 52. The structure of the front sound cavity 51 is advantageous for improving the high-frequency sound generation effect of the second diaphragm 3. The front cover 50 protects the second diaphragm 3 from external damage, is advantageous for use as a receiver, and can improve the stability and acoustic performance of the sound generating device 100. The circuit 200 has excellent acoustic performance and a wide range of applications.

[0060] Compared with the prior art, the circuit of the present invention is applied to a sound generating device, and is connected to the positive input terminal of the power amplifier via a first audio signal input terminal having high and low tones. The power amplifier then splits the signal into two signals, high and low, with the split low-pitched signal being directly input to the low-frequency sound generating module to generate sound, and the split high-pitched signal being connected in series with the capacitor and then input to the high-frequency sound generating module to generate sound. This structure allows the low-frequency sound generating module to generate low tones and the high-frequency sound generating module to generate high tones. In the circuit of the present invention, a speech signal is input to the second input terminal of the high-frequency sound generating module via the second audio signal input terminal. When the high-frequency sound generating module of the present invention is used as a receiver, the low-frequency sound generating module can function as an anti-phase noise canceling device. The circuit of the present invention can achieve multiple application functions with just one power amplifier, and has a simple structure and a wide range of applications.

[0061] The above is merely an embodiment of the present invention, and it should be noted here that those skilled in the art may make modifications without departing from the creative idea of ​​the present invention, and all such modifications are within the scope of protection of the present invention.

Claims

1. A circuit for use in a sound generating device, comprising: the circuit includes a first audio signal input terminal, a second audio signal input terminal, a power amplifier, a capacitor, a low-frequency sound generation module, and a high-frequency sound generation module; the first audio signal input terminal is used to receive an audio signal having high and low tones; the second audio signal input terminal is used to receive a speech signal; the first audio signal input terminal is connected to the positive input terminal of the power amplifier; The negative input of the power amplifier is connected to ground; The output terminal of the power amplifier is respectively connected to the input terminal of the low-frequency sound module and the first terminal of the capacitor; The second end of the capacitor is connected to the first input end of the high-frequency sound generation module; The second audio signal input terminal is connected to the second input terminal of the high frequency sound module; the sound-producing device includes a first vibration system for vibrating to produce a low-pitched sound and a second vibration system for vibrating to produce a high-pitched sound; the second vibration system is capable of functioning as a telephone receiver and emitting sound; the input end of the low-frequency sound module is the first input end of the sound generating device; the first input terminal of the high-frequency sound generating module is the second input terminal of the sound generating device; the second input terminal of the high-frequency sound module is the third input terminal of the sound generating device; wherein a first input end of the sound-producing device is connected to the first vibration system, and a second input end of the sound-producing device and a third input end of the sound-producing device are both connected to the second vibration system; 1. A circuit comprising:

2. A sound generating device using the circuit according to claim 1, the sound-producing device further includes a frame and a magnetic circuit system fixed to the frame, the first vibration system and the second vibration system being coaxially installed and located on opposite sides of the magnetic circuit system, the first vibration system including a first diaphragm fixed to the frame and a first voice coil fixed to the first diaphragm, the second vibration system including a second diaphragm fixedly supported by the magnetic circuit system and a second voice coil driving the second diaphragm to vibrate and generate sound, the magnetic circuit system including a first magnetic gap and a second magnetic gap, the first magnetic gap surrounding the second magnetic gap, the first voice coil inserted in the first magnetic gap and driving the first diaphragm to vibrate and generate low-pitched sounds, and the second voice coil inserted in the second magnetic gap and driving the second diaphragm to vibrate and generate high-pitched sounds. A sound generation device characterized by:

3. The magnetic circuit system includes a yoke, a main magnet steel assembly fixed to a side of the yoke close to the first diaphragm, and a sub-magnet steel assembly surrounding the main magnet steel assembly, the sub-magnet steel assembly and the main magnet steel assembly being spaced apart to form the first magnetic gap, the yoke being annular, the main magnet steel assembly including a main magnet steel having an annular shape, a main magnetic pole core fixed to cover the side of the main magnet steel away from the yoke, and sub-magnet steel, and the inner wall of the main magnet steel and the inner wall of the yoke are both inner walls. a cavity is formed by surrounding the main pole core, the main pole core including a main pole core body fixed to the main magnet steel, and a main pole core protrusion portion bent from an inner peripheral edge of the main pole core body and extending into the inner cavity, the auxiliary magnet steel is fixed so as to cover the side of the main pole core body away from the yoke, the main magnet steel and the yoke together surround the main pole core protrusion portion and are spaced apart from the main pole core protrusion portion to form the second magnetic gap with an opening facing the second vibration system, and the main pole core protrusion portion has a hollow annular shape; 3. The sound generating device according to claim 2.

4. the sound-producing device further includes an annular support frame, the support frame being fixed to a side of the yoke away from the frame, the periphery of the second diaphragm being supported and fixed to the side of the support frame away from the yoke, the magnetic circuit system and the second vibration system together surrounding and forming a bottom cavity, the bottom cavity communicating with the second magnetic gap; 4. The sound generating device according to claim 3.

5. the second diaphragm includes a second diaphragm vibration portion spaced apart from the yoke, a second diaphragm surround portion that bends and extends from an outer periphery of the second diaphragm vibration portion, and a second diaphragm connection portion that bends and extends from the second diaphragm surround portion to the support frame, the second diaphragm connection portion being fixed to the support frame, the second vibration system further including a second bobbin, a side of the second bobbin closer to the magnetic circuit system being fixed to the second voice coil, and a side of the second bobbin remote from the magnetic circuit system being fixed to the second diaphragm vibration portion, 5. The sound generating device according to claim 4.

6. the second bobbin includes a first fixed portion having an annular shape, an elastic arm bending and extending from the inside of the first fixed portion, and a second fixed portion extending from the elastic arm in a direction away from the first fixed portion, the second diaphragm connection portion and the support frame are fixed to opposite sides of the first fixed portion, the second diaphragm vibration portion and the second voice coil are fixed to opposite sides of the second fixed portion, the sub-magnetic steel assembly includes a sub-magnetic steel fixed to the yoke and a sub-pole core fixed so as to cover the side of the sub-magnetic steel away from the yoke, the second bobbin further includes a third fixed portion bending and extending from the outside of the first fixed portion toward the frame, the sub-pole core is fixed to the frame, and the third fixed portion is fixed to the side of the sub-pole core away from the frame, and the frame is rectangular.

6. The sound generating device according to claim 5.

7. the first diaphragm has an annular shape, an inner circumferential side of the first diaphragm is fixed to the auxiliary magnet steel, and an outer circumferential side of the first diaphragm is fixed to the frame; 4. The sound generating device according to claim 3.

8. the first vibration system further includes a first bobbin having an annular shape, the first voice coil is fixed to a side of the first bobbin close to the magnetic circuit system, the first diaphragm includes a first surround having an annular shape and a second surround having an annular shape, the first surround is disposed so as to surround the second surround and is spaced apart from the second surround, the second surround is disposed so as to surround the auxiliary magnet steel, an inner peripheral side of the second surround is fixed to an outer side of the auxiliary magnet steel, the first bobbin functions as a dome of the first diaphragm, an outer peripheral side of the first bobbin is fixed to an inner peripheral side of the first surround, the inner peripheral side of the first bobbin is fixed to an outer peripheral side of the second surround, and the outer peripheral side of the first surround is fixed to the frame.

8. The sound generating device according to claim 7.

9. the first bobbin includes a first portion having an annular shape, a second portion bending and extending from an inner peripheral side of the first portion toward the first voice coil, and a third portion bending and extending from an outer peripheral side of the first portion toward the yoke, the first voice coil being fixed to a side of the second portion closer to the yoke and a side of the second portion away from the yoke being fixed to an outer peripheral side of the second surround, the first vibration system further including an elastic support assembly installed at a distance from the first surround, one end of the elastic support assembly being fixed to the frame and the other end of the elastic support assembly being fixed to the third portion, 9. The sound generating device according to claim 8.

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