CN111601221A

CN111601221A - High-pitch sound production device

Info

Publication number: CN111601221A
Application number: CN202010469464.2A
Authority: CN
Inventors: 薄云飞; 张迪; 周勇
Original assignee: Goertek Inc
Current assignee: Weifang geldanna Electronic Technology Co.,Ltd.
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-08-28

Abstract

The application discloses high pitch sound generating mechanism. This high pitch sound generating mechanism includes: the frame structure comprises a basin frame, the basin frame is provided with a containing groove, and a bearing table is formed above the containing groove; the magnetic circuit system comprises a central magnetic component, a through hole is formed in the central magnetic component, and the magnetic circuit system is arranged on the bearing table; the vibration assembly comprises a vibrating diaphragm, the edge of the vibrating diaphragm is connected with the frame structure, the vibrating diaphragm covers the through hole of the central magnetic part, and the vibrating diaphragm is communicated with the accommodating groove through the through hole; a sound-absorbing material disposed in the receiving groove. One technical effect of this application lies in having enlarged the space of high pitch sound generating mechanism back sound chamber.

Description

High-pitch sound production device

Technical Field

The application belongs to the technical field of electroacoustic transduction, specifically, this application relates to a high pitch sound generating mechanism.

Background

With the development of electroacoustic transducer technology, sound generating devices are widely used in people's daily life. The sound generating device is mounted on the special audio-visual equipment, for example, a vehicle or a building can also be provided with the sound generating device, so that the audio-visual equipment is convenient to use in daily life.

In the art, different types of sound generating devices can be designed according to different sound frequency segments to be generated and different sound volumes, so as to achieve better acoustic effect. For example, large woofers and tweeters are available in the art as home audio, car audio, and the like.

The overall structure of the tweeter is smaller relative to the woofer due to its own acoustic performance requirements. In order to meet the requirement of narrow assembling space, the high pitch loudspeaker is further designed to be compact by those skilled in the art. This design compresses the back volume of the tweeter. When the high pitch loudspeaker vibrates to produce sound, air pressure in the rear cavity is increased due to factors such as vibration and temperature. This causes the air in the back volume to resonate more easily, which in turn affects the acoustic performance of the tweeter.

Disclosure of Invention

It is an object of the present application to provide an improved treble sound generating apparatus.

According to an aspect of the present application, there is provided a high pitch sound generating apparatus including:

the frame structure comprises a basin frame, the basin frame is provided with a containing groove, and a bearing table is formed above the containing groove;

the magnetic circuit system comprises a central magnetic component, a through hole is formed in the central magnetic component, and the magnetic circuit system is arranged on the bearing table;

the vibration assembly comprises a vibrating diaphragm, the edge of the vibrating diaphragm is connected with the frame structure, the vibrating diaphragm covers the through hole of the central magnetic part, and the vibrating diaphragm is communicated with the accommodating groove through the through hole;

a sound-absorbing material disposed in the receiving groove.

Optionally, the sound-absorbing material has a hollow hole corresponding to the position of the through hole.

Optionally, the diameter of the hollowed-out hole is smaller than the diameter of the through hole.

Optionally, the sound absorbing material is sound absorbing foam or non-foaming sound absorbing material.

Optionally, a sound guide protrusion is formed on a bottom surface of the accommodating groove, the sound guide protrusion extends in a protruding manner in a direction close to the diaphragm along an axial direction of the through hole, and the sound absorbing material is disposed around the sound guide protrusion.

Optionally, the side surface of the sound guide projection is an inclined arc surface.

Optionally, the sound guide projection has an arc-shaped top surface.

Optionally, the size of the sound guide projection along the radial direction of the through hole is smaller than the diameter of the through hole.

Optionally, the height of the sound guide protrusion is lower than the depth of the accommodating groove.

Optionally, the frame structure includes an upper case, the upper case is fastened to the basin frame, the magnetic circuit system is located in the upper case, the upper case has a sound outlet, and one side of the diaphragm, which is far away from the magnetic circuit system, is communicated with the sound outlet.

The technical effect of this application lies in, has increased the interior sound cavity volume of high pitch sound generating mechanism, improves high pitch sound generating mechanism's acoustic performance.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a side cross-sectional view of a high pitch sound device in accordance with an embodiment of the present application;

fig. 2 is a side cross-sectional view of a high pitch sound device according to another embodiment of the present application;

fig. 3 is a schematic illustration of the effect on airflow of a high pitch sound device as provided herein;

fig. 4 is a comparison graph of the sensitivity test of the high-pitch sound device provided by the present application and the prior art.

Description of reference numerals:

11. a basin stand; 111. accommodating grooves; 112. a sound guide projection; 12. an upper shell; 21. a central magnetic component; 211. a through hole; 22. an edge magnetic member; 23. a magnetic gap; 31. vibrating diaphragm; 32. a coil; 4. a sound absorbing material; 41. and (6) hollowing out the holes.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

An improved treble sound generator is provided comprising a frame structure, a magnetic circuit, a vibration assembly and sound absorbing material 4. As shown in fig. 1, the frame structure includes a frame 11, the frame 11 is used for supporting and manufacturing various components of the high-pitched sound generating apparatus, and the frame 11 is generally located at the bottom of the high-pitched sound generating apparatus. The basin frame 11 is formed with an accommodating groove 111, and the accommodating groove 111 can be a sunken groove structure. The tub frame 11 is formed with a bearing table above the receiving groove 111. The frame 11 may support the treble sounding device through the receiving groove 111 and the bearing table.

The magnetic circuit system is used for forming a magnetic field in the high-pitch sounding device so as to provide electromagnetic driving force to the conductive part of the vibration assembly to enable the conductive part to vibrate. The magnetic circuit system comprises a central magnetic part 21, which central magnetic part 21 is adapted to form a magnetic field around it. The central magnetic member 21 may be a magnet, an electromagnet, or a magnetically conductive member. The other components of the magnetic circuit system are capable of forming a magnetic field in the frame structure in combination with the central magnetic component 21 to provide a driving action on the vibrating assembly. The central magnetic member 21 has a through hole 211 formed therethrough, as shown in fig. 1. The magnetic circuit system is integrally positioned on the bearing platform, and the through hole 211 and the accommodating groove positioned below the bearing platform form a communication relation.

The vibration assembly comprises a diaphragm 31, the edge of the diaphragm 31 being connected to the frame structure, as shown in fig. 1. The diaphragm 31 is encapsulated over the entire structure of the frame structure. The diaphragm 31 may be connected to a coil 32 or a conductive part such as a conductive circuit, which extends into the magnetic field generated by the magnetic circuit system. After the current is introduced into the conductive part, the current and the magnetic field generate electromagnetic acting force, so that the vibration component is driven to move and vibrate. Through this kind of vibration principle, the vibration subassembly can vibrate the sound production. The diaphragm 31 covers the through hole 211 of the central magnetic member 21, and the diaphragm 31 can communicate with the accommodating groove 111 through the through hole 211.

The application provides a high pitch sound generating mechanism is through seting up the through-hole that link up on magnetic circuit's central magnetic component for the space of the inside back sound chamber of one side of vibrating diaphragm intercommunication to high pitch sound generating mechanism can increase. Furthermore, the through holes play a role in guiding the circulation and compression of air. When the high pitch sound generating device vibrates to generate sound, the frame structure is internally provided with a vibrating diaphragm communicated to the whole space of the containing groove through the through hole to form a rear sound cavity. The vibration of the diaphragm and the temperature rise can cause the air in the rear sound cavity to flow and compress along the axial direction of the through hole. The through hole in the central magnetic component effectively increases the internal space of the high-pitch sound production device, and the problem that the acoustic performance is influenced by the fact that the internal air pressure is obviously increased under the working state of the high-pitch sound production device is solved.

The sound-absorbing material 4 is disposed in the receiving groove 111, as shown in fig. 1. The sound-absorbing material 4 can absorb vibration and air molecules. Since the diaphragm 31 communicates with the receiving groove 111 through the through hole 211, the sound-absorbing material 4 can effectively absorb the vibration inside the high-pitched sound generator, reducing the risk of resonance. When the inside atmospheric pressure of high pitch sound generating mechanism risees, sound absorbing material 4 also can absorb the air molecule to a certain extent, plays the effect that is equivalent to increase back sound chamber to alleviate the problem that atmospheric pressure risees.

This application is through the through-hole of seting up on the central magnetic part and inhale the cooperation of sound material for the inside space of high pitch sound generating mechanism obtains make full use of, is showing to increase the back sound chamber and can be to atmospheric pressure, vibration formation effective absorption's space. The air in back sound chamber can receive the guide effect of through-hole for vibration can be directional transmit to on the sound absorbing material, thereby by sound absorbing material absorption, buffering. The technical scheme of this application can effectively reduce high pitch sound generating mechanism's resonant frequency FO, improves high pitch sound generating mechanism's acoustic performance.

Optionally, the sound absorbing material 4 has a hollowed-out hole 41, as shown in fig. 2. The positions of the through holes 41 correspond to the positions of the through holes 211. By forming the hollow holes 41 at the positions corresponding to the through holes 211, the contact area between the air at the through holes 211 and the sound-absorbing material 4 can be increased, and the response speed of the sound-absorbing material 4 to the absorption of air molecules and vibration can be increased. The shape of the hollow hole 41 may match the shape of the through hole. For example, if the through hole is a cylindrical hole or a rectangular hole, the hollow hole 41 is also a cylindrical hole or a rectangular hole. The through holes are parallel to the axial direction of the hollow holes 41, or are coaxially arranged. This design allows the aperture 41 to better accommodate the air guidance of the through-hole. The through-hole can the air play along the effect of axial guide, the shape of fretwork hole and through-hole, gesture match can make the more smooth and easy circulation of air molecule fully contact in the sound absorbing material around in the fretwork hole, realize that quick absorption air is breathed out the vibration.

Optionally, the diameter of the hollow hole 41 is smaller than the diameter of the through hole. The sound-absorbing material 4 shields a part of the end surface of the through-hole, so that the vibration transmitted to the through-hole can be directly absorbed by the sound-absorbing material 4. The greater the volume of the sound-absorbing material 4 in a limited space, the greater the ability to absorb air molecules and vibrations. If the size of the hollow hole 41 is too large, the space utilization of the housing groove is lost, and the sound-absorbing material 4 as a whole is affected in the improvement of the acoustic performance. Design into the diameter of fretwork hole 41 and be less than the diameter of through-hole, the space of utilization holding tank that can be better makes the abundant vibration production absorption, the cushioning effect to in the through-hole of sound absorbing material.

Optionally, the sound absorbing material may be foam or non-foamed sound absorbing material. Both the foam and the non-foam sound-absorbing material have porous structures. The porous structure can absorb air molecules and vibration, and effectively buffer air pressure change and vibration. The present application does not limit the concrete structure and material of the sound-absorbing material. In alternative embodiments, the present application may employ means for adhesively securing the foam within the receiving channel; the non-foamed sound absorbing material may be made into particles, and the particles may be enclosed by a ventilation member and then entirely placed in the housing tank.

Alternatively, as shown in fig. 2, a sound guide protrusion 112 is formed on the bottom surface of the receiving groove 111, and the sound guide protrusion 112 protrudes upward from the bottom surface of the receiving groove 111. The extending direction of the sound guide protrusion 112 is along the axial direction of the through hole 211, and it protrudes and extends for a distance toward the direction of the diaphragm 31. The position of the sound guide projection 112 corresponds to the position of the through hole 211. The sound-absorbing material 4 may be disposed around the sound guide protrusion 112.

The sound guide protrusion 112 may guide air inside the high-pitched sound generating apparatus. In a state where the diaphragm 31 vibrates to cause air flow and air pressure change, the sound guide projection 112 extends in the axial direction of the through hole 211, so that the air flowing through the through hole 211 is guided and branched to the periphery of the sound guide projection 112, and the air and vibration are guided to the sound-absorbing material 4 located around the sound guide projection. Air and vibration can be absorbed by sound absorbing material by efficient through leading protruding dredging of leading sound to wholly reduce high pitch sound generating mechanism's resonant frequency, avoid high pitch sound generating mechanism to take place acoustics problems such as resonance, show better high frequency vibration performance.

Alternatively, as shown in fig. 2, the sidewall of the sound guide protrusion 112 may be a curved surface. That is, the side surface of the sound guide projection 112 is an inclined arc surface. The sound guide protrusion 112 has an arc-shaped protrusion structure with a bottom gradually shrinking to a top along an axial section. The curved surface can better guide the airflow in the through hole 211. In the embodiment shown in fig. 2 and 3, the air flowing through the through hole 211 flows down to the arc-shaped side surface of the sound guide protrusion 112 after the receiving groove 111 to guide the air to the periphery of the sound guide protrusion 112, so that the vibration can be smoothly transmitted to the sound-absorbing material.

Optionally, the top of the sound guide projection 112 is an arc-shaped top surface, as shown in fig. 2. The arc-shaped surfaces of the arc-shaped top surface and the side surfaces can play a role in guiding air flow and air vibration. Have smooth upper surface for leading the sound arch, the curved top surface can be more smooth and easy leads the air current to sound absorbing material on every side, reduces the hindrance, the bounce-back effect to the air current.

Optionally, the size of the sound guide projection 112 along the radial direction of the through hole 211 is smaller than the diameter of the through hole 211. For example, the sound guide protrusion 112 may have a cylindrical structure, and an axis of the cylindrical structure may overlap with an axis of the through hole 211, and a diameter of the cylindrical structure is smaller than a diameter of the through hole 211. If the diameter of the sound guide projection 112 is too large, the sound guide projection 112 may block the through hole 211, that is, the sound guide projection 112 may obstruct and bounce the airflow in the through hole 211. This phenomenon makes it difficult for the housing groove to constitute a part of the rear sound cavity, and also impairs the sound absorption function that the sound absorbing material can exert. Therefore, by designing the dimension of the sound guide projection in the radial direction of the through hole to be smaller than the diameter of the through hole, the sound guide projection can reduce the blocking effect of the formation of the sound guide projection under the condition of playing the role of guiding the air flow as much as possible. The actual effective space of the rear sound cavity in the high-pitch sound production device is improved, and the sound absorption effect of the sound absorption material is exerted to the maximum extent.

Optionally, the height of the sound guide protrusion 112 is lower than the depth of the receiving groove 111. In the embodiment shown in fig. 2 and 3, the sound guide projection 112 protrudes upward from the bottom surface of the receiving groove 111, the sound guide projection 112 is entirely located in the receiving groove 111, and the top end of the sound guide projection 112 is lower than the upper end edge of the receiving groove 111. This embodiment can prevent the sound guide projection from extending into the through hole from the receiving groove as much as possible, and can reduce the possibility of the sound guide projection blocking the through hole. If the height of the sound guide bulge is too high, the sound guide bulge protrudes upwards into the through hole, air in the through hole cannot smoothly circulate, and the pressure relief capacity of the rear sound cavity is reduced.

The application provides a high pitch sound generating mechanism has effectively increased the space in inside sound chamber to can form the guide effect to the air current in the back sound chamber. This design can effectively reduce sound generating mechanism's resonant frequency F0, the frequency width of the product of widening, and this structure makes sound generating mechanism's high frequency listening effect better to the guide effect of intracavity air.

Fig. 4 shows the response sensitivity of the high-pitch sound generating apparatus provided by the present application to a sound signal as a function of the frequency of the sound signal. The high-pitch sound production device provided by the application can show higher response sensitivity in a sound vibration frequency range of 8KHz-20KHz compared with the prior art. This shows that the rear sound cavity inside the high-pitch sound generating device can exert the more obvious effects of absorbing vibration and stabilizing air pressure, so that the diaphragm can show more excellent vibration sensitivity. Wherein 10KHz-20KHz is as higher vibration frequency range, the high pitch sound generating device of this application obviously has more excellent response sensitivity, and acoustic performance is better. In the acoustics product that has the equidimension, the back sound chamber of the high pitch sound generating mechanism of this application can better play the acoustics effect, improves the high frequency vibration performance of vibration subassembly.

Optionally, the frame structure may further include an upper shell 12, as shown in fig. 1 and 2, the upper shell 12 is fastened to the frame 11, and both of them constitute a complete receiving structure. The magnetic circuit system is positioned in a space surrounded by the upper shell 12, and the basin stand 11 supports the upper shell 12 and the magnetic circuit system. The upper case 12 is formed with a sound outlet. The diaphragm 31 may be disposed in the upper case 12, or may be disposed on the magnetic circuit system. One side of the diaphragm 31 is in communication with the sound outlet. For example, one side of the diaphragm 31 may face the sound outlet. The space between the diaphragm 31 and the sound outlet hole is used for air circulation, so that sound vibration can be transmitted from the sound outlet hole. The side of the diaphragm 31 facing away from the sound outlet hole communicates with the receiving groove 111 through the through hole 211, and this space serves as a rear sound chamber of the high-pitched sound generating apparatus. The frame 11 may be made of a plastic material to reduce weight. Through this kind of structural design, frame construction can provide whole supporting role to magnetic circuit, vibration subassembly on the one hand, and the upper cover and the basin frame of the mutual lock of on the other hand are convenient for form confined space with magnetic circuit to reach the performance needs that the high pitch takes place.

Optionally, the magnetic circuit system may further include an edge magnetic component 22, as shown in fig. 1. A magnetic gap 23 is formed between the side magnetic member 22 and the center magnetic member 21. In an alternative embodiment, the edge magnetic component 22 may be a magnet, and the central magnetic component 21 is a magnetic conductive T-iron; alternatively, both the center magnetic member 21 and the edge magnetic member 22 may be magnets; alternatively, the side magnetic member 22 is a magnetic conductive member, and the center magnetic member 21 is a magnet. By forming the magnetic gap 23, a stable, uniform magnetic field can be provided to the conductive members on the vibrating assembly. The conductive member of the vibration assembly may be a coil 32, as shown in FIG. 1.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. A high pitch sound generating apparatus, comprising:

a sound-absorbing material disposed in the receiving groove.

2. The high-pitch sound production device according to claim 1, wherein the sound-absorbing material has a hollow hole corresponding to the through hole.

3. The high pitch sound generating apparatus of claim 2, wherein the diameter of the hollow hole is smaller than the diameter of the through hole.

4. The high pitch sound generating apparatus of claim 1, wherein the sound absorbing material is a sound absorbing foam or a non-foamed sound absorbing material.

5. The apparatus as claimed in any one of claims 1 to 4, wherein a sound guide protrusion is formed on a bottom surface of the receiving groove, the sound guide protrusion is protruded and extended in a direction approaching the diaphragm along an axial direction of the through hole, and the sound absorbing material is disposed around the sound guide protrusion.

6. A sound-generating apparatus according to claim 5, characterised in that the side surfaces of said sound-guiding projection are inclined arcuate surfaces.

7. A sound-producing treble device as claimed in claim 5, characterized in that the sound-guiding projection has an arcuate top surface.

8. A sound-producing treble device as claimed in claim 5, characterized in that the sound-guiding projection has a smaller dimension in the radial direction of the through-hole than the diameter of the through-hole.

9. The device of claim 5, wherein the height of the sound guide protrusion is lower than the depth of the receiving groove.

10. The apparatus of claim 1, wherein the frame structure comprises an upper case, the upper case is fastened to the frame, the magnetic circuit is disposed in the upper case, the upper case has a sound outlet, and a side of the diaphragm away from the magnetic circuit is in communication with the sound outlet.