WO2023115995A1

WO2023115995A1 - Double-tone double-diaphragm pneumatic tweeter

Info

Publication number: WO2023115995A1
Application number: PCT/CN2022/112529
Authority: WO
Inventors: 陈坚强
Original assignee: 国英电子(惠州)有限公司
Priority date: 2021-12-21
Filing date: 2022-08-15
Publication date: 2023-06-29
Also published as: CN114125665A

Abstract

The present invention relates to the technical field of loudspeakers, and provides a double-tone double-diaphragm pneumatic tweeter. The tweeter comprises a main body structure, wherein the main body structure comprises a first panel, a second panel, a magnetic ring, a first diaphragm, and a second diaphragm, wherein the first panel and the second panel are both provided with sound holes, the magnetic ring is fixedly mounted between the second panel and the first panel, the first diaphragm is encapsulated between the first panel and the magnetic ring, the second diaphragm is encapsulated between the second panel and the magnetic ring, a closed space is formed between the second diaphragm and the first diaphragm, and air exists in the closed space; and the main body structure further comprises a damping plate, which is fixedly mounted inside the magnetic ring and made of wool felt. According to the double-tone double-diaphragm pneumatic tweeter provided by the present invention, the operating frequency range of a pneumatic tweeter is widened, and the nonlinear harmonic distortion of a diaphragm is effectively alleviated; and with the damping plate being arranged between the first diaphragm and the second diaphragm, the problem that mechanical damping is difficult to overcome by a single diaphragm is solved, thereby overcoming difficulties in the industry.

Description

Double-tone double-membrane pneumatic tweeter

technical field

The invention relates to the technical field of loudspeakers, in particular to a double-tone double-membrane pneumatic tweeter.

Background technique

The speaker is actually a conversion device that converts electrical energy into sound. When different electronic energies are transmitted to the coil, the coil generates an energy that interacts with the magnetic field of the magnet. This interaction causes the paper plate to vibrate, because the electronic energy changes at any time. The coil of the horn will move forward or backward, so the paper plate of the horn will move accordingly. This action changes the density of the air and produces sound.

The operating frequency range of the current pneumatic tweeter is relatively small, and the nonlinear harmonic distortion of the sound film is relatively serious. It is difficult to solve the problem of mechanical damping with a single diaphragm, which also leads to problems in the industry.

For this reason, a kind of two-tone double-membrane pneumatic tweeter is proposed.

Contents of the invention

The present invention provides a dual-tone and double-membrane pneumatic tweeter for the purpose of widening the operating frequency range of the pneumatic tweeter, effectively improving the nonlinear harmonic distortion of the sound film, solving the problem that a single diaphragm is difficult to solve the mechanical damping problem, and solving industry problems. trumpet.

The specific technical scheme is as follows:

A two-tone double-membrane pneumatic tweeter, comprising:

The main structure, the main structure includes a panel one, a panel two, a magnetic ring, a sound film one and a sound film two, the first panel and the second panel are provided with sound holes, and the magnetic ring is fixedly installed on the Between the panel two and the panel one, the sound film one is packaged between the panel one and the magnetic ring, and the sound film two is packaged between the panel two and the magnetic ring, so An airtight space is formed between the second sound membrane and the first sound membrane, and air is contained in the airtight space.

As a preferred solution of the present invention, the main structure further includes a damping plate, the damping plate is fixedly installed inside the magnetic ring, and the damping plate is made of wool felt.

As a preferred solution of the present invention, the second sound membrane and the first sound membrane are symmetrically distributed on both sides of the damping plate.

As a preferred solution of the present invention, both the second sound membrane and the first sound membrane have positive and negative connection lines, and both the positive and negative connection lines extend to the outside of the main structure.

As a preferred solution of the present invention, both the inner side of the first panel and the inner side of the second panel are provided with threading grooves for passing the positive and negative connecting wires.

As a preferred solution of the present invention, both the first panel and the second panel are made of plastic, and both the first panel and the second panel are circular.

As a preferred solution of the present invention, the central positions of the panel 1 and the panel 2 are both formed with horn-shaped depressions towards the magnetic ring.

As a preferred solution of the present invention, the sound holes are all distributed in the horn-shaped depressions, and the sound holes in each of the horn-shaped depressions are arranged in a circular and equiangular manner.

As a preferred solution of the present invention, the magnetic ring is made of magnetic steel.

As a preferred solution of the present invention, the structure of the first panel is completely the same as that of the second panel, and the structure of the first sound membrane is exactly the same as that of the second sound membrane.

The present invention has the following beneficial effects:

1. The sound membrane 1 and the sound membrane 2 are integrated through the airbag-type closed space, which enhances the structural strength of the sound membrane, reduces the split vibration of the sound membrane and reduces harmonic distortion, and this airbag-type closed space structure improves the structural strength of the sound membrane , it will not increase the resonance frequency of the sound film, and even reduce the resonance frequency of the sound film, broadening the operating frequency range of the pneumatic tweeter;

2. Use the air damping of the airbag-type closed space to improve the nonlinear harmonic distortion of the sound film;

3. The sound membrane 1 and the sound membrane 2 of this kind of airbag-type closed space structure are set back to back and symmetrically, which can offset the nonlinear distortion produced by the asymmetric shape of the two sound membranes in the push-pull work, so as to improve the harmonic effect of distortion;

4. In this airbag-type closed space structure, a mechanical damping material, that is, a damping plate, is set between the first sound membrane and the second sound membrane. The damping effect of the pneumatic diaphragm can be adjusted by selecting the damping plate made of wool felt and the number, thereby further Improve the nonlinear harmonic distortion of the diaphragm when it is working. The damping plate installed between the first and second diaphragms solves the problem that a single diaphragm is difficult to solve the mechanical damping problem. It can be said that it has solved the problem of the industry.

Description of drawings

Fig. 1 is the structural representation of the two-tone double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the explosive structure of the dual-tone and double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 3 is a schematic diagram of the front view structure of the dual-tone and double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 4 is a schematic cross-sectional structural view cut along A-A in Fig. 3;

5 is a schematic structural view of panel 1 of the dual-tone and double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 6 is a frequency change diagram of the single-tone membrane working mode of the dual-tone double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 7 is a frequency change diagram of the dual-tone membrane positive push-pull working mode of the dual-tone double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 8 is a frequency change diagram of the double-tone membrane anti-push-pull working mode of the dual-tone double-membrane pneumatic tweeter provided by the embodiment of the present invention;

Fig. 9 is a comparative diagram of the improvement of harmonic distortion of the dual-tone and double-membrane pneumatic tweeter provided by the embodiment of the present invention.

In the attached picture:

1. Panel 1; 2. Panel 2; 3. Magnetic ring; 4. Damping plate; 5. Sound film 1; 6. Sound film 2; 7. Sound hole; 8. Threading groove.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.

In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred devices or elements must It has a specific orientation, is constructed and operated in a specific orientation, so the terms describing the positional relationship in the drawings are for illustrative purposes only, and should not be understood as limitations on this patent. For those of ordinary skill in the art, the specific understanding of the specific meaning of the above terms.

In the description of the present invention, unless otherwise clearly stipulated and limited, if the term "connection" or the like indicates the connection relationship between parts, the term should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two parts or the interaction relationship between two parts. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The double-tone double-membrane pneumatic tweeter provided by the embodiment of the present invention, as shown in Figures 1-5, includes: a main structure, the main structure includes a panel 1, a panel 2, a magnetic ring 3, a sound film 5 and a sound film Two 6, the panel one 1 and the panel two 2 are provided with sound holes 7, the magnetic ring 3 is fixedly installed between the panel two 2 and the panel one 1, the sound film one 5 is encapsulated between the panel one 1 and the magnetic ring 3, The sound film two 6 is encapsulated between the panel two 2 and the magnetic ring 3, and a closed space is formed between the sound film two 6 and the sound film one 5, and there is air in the closed space.

Among them, as shown in Figures 1-4, more perfectly, the main structure also includes a damping plate 4, the damping plate 4 is fixedly installed inside the magnetic ring 3, and the damping plate 4 is made of wool felt, and the damping plate 4 The thickness can be determined according to the actual process standard.

The two-tone double-membrane pneumatic tweeter adopting the above technical scheme is mainly composed of panel one 1, panel two 2, magnetic ring 3, sound film one 5 and sound film two 6, so that the structure of the two-tone double-membrane pneumatic tweeter is simple, especially Suitable for mass production.

Its working principle is: a closed space (airbag space) is formed between the magnetic ring 3, the sound film 1 5 and the sound film 2 6, and there is air (air as the medium) in the closed space, so that the sound film 1 5 and the sound film 2 6 can form a whole through the interaction of air. During work, the sound membrane 1 5 and the sound membrane 2 6 can push and pull each other, damp each other, and compensate each other through the air in the confined space;

At the same time, during work, the closed space structure formed between the magnetic ring 3, the first sound film 5 and the second sound film 6 plays an important role in improving the nonlinear harmonic distortion of the aerodynamic treble.

The present invention improves the nonlinear harmonic distortion in the following four aspects:

1. The sound film 1 5 and the sound film 2 6 are integrated through the airbag-type closed space, which enhances the structural strength of the sound film, reduces the split vibration of the sound film and reduces harmonic distortion, and this air-bag closed space structure improves the sound of the sound film. The structural strength will not increase the resonance frequency of the sound film, and even reduce the resonance frequency of the sound film, which broadens the operating frequency range of the pneumatic tweeter;

3. The sound membrane 1 5 and the sound membrane 2 6 of this airbag closed space structure are set back to back and symmetrically, which can offset the nonlinear distortion produced by the asymmetric shape of the two sound membranes during push-pull work, thereby achieving improvement The role of harmonic distortion;

4. In this airbag-type closed space structure, a mechanical damping material, that is, a damping plate 4, is set between the sound film 1 5 and the sound film 2 6. The damping of the pneumatic diaphragm can be adjusted by selecting the damping plate 4 and the number made of wool felt effect, thereby further improving the nonlinear harmonic distortion of the diaphragm during work.

The damping plate 4 installed between the first 5 and the second 6 pieces of the sound membrane solves the problem that a single diaphragm is difficult to solve the mechanical damping problem. It can be said that it solves the problem of the industry.

In addition, it should be noted that the specific material of the damping plate 4 can be adjusted according to the use of the speaker and the requirements of the application scene. The material (damping coefficient) and the thickness (quantity, density) of the damping plate can be adjusted. In practical applications, it can be adjusted flexibly. In this embodiment, the damping plate 4 is made of wool felt because the damping plate 4 made of wool felt has a better damping effect in adjusting the pneumatic diaphragm.

Specifically, in this embodiment:

1. Single-sound film working mode: Only one set of diaphragms (one of sound film 1 5 and sound film 2 6) is connected to the circuit to work. When a single diaphragm works, one group of diaphragms is in an active working state. The air coupling in the airbag-type closed space structure drives another set of diaphragms to work passively. This mode forms a "double resonance peak state". The operating frequency range of the sound diaphragm is relatively wide. One set of diaphragms actively radiates sound, and the other set of diaphragms The sheet passively radiates sound, forming an inverted figure-of-eight directivity of front and rear radiation. The characteristic is that the sound pressure of the front radiation is about 6db higher than that of the rear radiation.

2. Dual-sound membrane positive push-pull working mode: on the circuit, two groups of diaphragms (sound membrane 1 5 and sound membrane 2 6) work in reverse phase at the same time (series connection and parallel connection are the same). The membranes are set back to back and the circuit is connected in reverse phase. The dual-sound membranes are in the push-pull vibration state in the same direction, both of which are actively working and drive each other to push-pull. This mode forms a "single resonance peak state", but the resonance frequency is lower and the resonance peak is higher. , the output sound pressure is higher. At this time, the sound membrane has the widest operating frequency range, and the output sound pressure is about 3db higher than that of the single membrane mode. Due to the radiation before and after the active work of the double membrane, it also presents an inverted figure-of-eight directivity. The characteristic is that the front and rear radiation sound pressure is the same, but the sound phase is opposite.

3. Dual-sound film anti-push-pull working mode: On the circuit, two sets of diaphragms (sound film 1 5 and sound film 2 6) work in phase at the same time (series connection and parallel connection are also the same). When the dual-sound membranes are working, because the dual-sound membranes are set back to back and the circuit is connected in phase, the dual-sound membranes are in the opposite push-pull vibration state, and they are all actively working, driving each other in reverse push-pull. This mode also forms a "single resonance peak State", but the resonant frequency is relatively high, and the frequency response curve shifts to the high frequency direction. At this time, the working frequency range of the sound film is narrow, and the output sound pressure is the same as that of the double sound film positive push-pull working mode. Due to the radiation before and after the active work of the double membrane, it also presents an inverted figure-of-eight directivity. The characteristic is that the front and rear radiation sound pressure is the same, the frequency response working range is narrow, but the sound phase is the same.

Specifically, in this embodiment, in order to further improve the nonlinear harmonic distortion of the first sound membrane 5 and the second sound membrane 6 when they are working, the second sound membrane 6 and the second sound membrane 5 are symmetrically distributed on both sides of the damping plate 4. side.

Specifically, in this embodiment, as shown in Figure 2, in order to facilitate wiring between the sound film two 6 and the sound film one 5, the set sound film two 6 and the sound film one 5 all have positive and negative connection lines, and the positive and negative The pole connecting wires all extend to the outside of the main structure, which is convenient for wiring through the positive and negative pole connecting wires.

Specifically, in this embodiment, as shown in Figure 2, in order to facilitate the extraction of the positive and negative connecting wires, the inner side of the set panel one 1 and the inner side of the panel two 2 are provided with holes for passing through the positive and negative electrodes. Threading slot 8 for connecting wire.

Specifically, in this embodiment, as shown in Figures 1-4, in order to eliminate the interference of panel one 1 and panel two 2 on sound film two 6 and sound film one 5, the set panel one 1 and panel two 2 are Made of plastic, and the first panel 1 and the second panel 2 are circular.

Specifically, in this embodiment, as shown in Figure 2, in order to improve the sound quality of the two-tone double-membrane pneumatic tweeter, the central positions of the set panel one 1 and panel two 2 all form a horn-shaped depression towards the magnetic ring 3 , the sound holes 7 are all distributed in the horn-shaped depressions, and the sound holes 7 in each horn-shaped depression are arranged in a circular and equiangular manner.

Specifically, in this embodiment, in order to improve the performance of the magnetic ring 3, the magnetic ring 3 provided is made of magnetic steel.

Specifically, in this embodiment, in order to further enhance and improve the nonlinear harmonic distortion of the dual-tone and double-film pneumatic tweeter at work, as shown in Figure 2, the structures of the set panel one 1 and panel two 2 are completely The same, and the first panel 1 and the second panel 2 are symmetrically arranged, the structure of the first sound film 5 and the second sound film 6 are exactly the same, and the first sound film 5 and the second sound film 6 are arranged symmetrically.

Specifically, in this embodiment, the performance test results of the dual-tone and double-membrane pneumatic tweeter provided in this embodiment are as follows:

From the data shown in Figures 6-9, it can be known that the dual-tone and double-film pneumatic tweeter provided by this embodiment has the following advantages:

4. In this airbag-type closed space structure, a mechanical damping material, that is, a damping plate 4, is set between the sound film 1 5 and the sound film 2 6. The damping of the pneumatic diaphragm can be adjusted by selecting the damping plate 4 and the number made of wool felt effect, so as to further improve the nonlinear harmonic distortion of the diaphragm when it is working. The damping plate 4 set between the 6 pieces of the sound film 1 and the sound film 2 solves the problem that a single diaphragm is difficult to solve the mechanical damping. It can be said that cracking problems of the industry.

The above are only preferred embodiments of the present invention, and are not intended to limit the implementation and protection scope of the present invention. For those skilled in the art, they should be able to realize the equivalent replacement and The solutions obtained by obvious changes shall all be included in the protection scope of the present invention.

Claims

A two-tone double-membrane pneumatic tweeter is characterized in that it comprises:

The main structure, the main structure includes a panel one, a panel two, a magnetic ring, a sound film one and a sound film two, the first panel and the second panel are provided with sound holes, and the magnetic ring is fixedly installed on the Between the panel two and the panel one, the sound film one is packaged between the panel one and the magnetic ring, and the sound film two is packaged between the panel two and the magnetic ring, so An airtight space is formed between the second sound membrane and the first sound membrane, and air is contained in the airtight space.
The double-tone and double-membrane pneumatic tweeter according to claim 1, wherein the main structure further includes a damping plate, the damping plate is fixedly installed inside the magnetic ring, and the damping plate is made of wool felt production.
The double-tone double-membrane pneumatic tweeter according to claim 2, wherein the second sound membrane and the first sound membrane are symmetrically distributed on both sides of the damping plate.
The double-tone double-membrane pneumatic tweeter according to claim 3, characterized in that, both the second sound membrane and the first sound membrane have positive and negative connection lines, and the positive and negative connection lines extend to the exterior of the main structure.
The double-tone and double-membrane pneumatic tweeter according to claim 4, characterized in that, the inside surface of the first panel and the inner surface of the second panel are provided with holes for passing through the positive and negative connecting wires. Wire groove.
The double-tone and double-membrane pneumatic tweeter according to claim 5, wherein the first panel and the second panel are both made of plastic, and both the first panel and the second panel are circular.
The double-tone and double-membrane pneumatic tweeter according to claim 6, wherein the central positions of the first panel and the second panel both form a horn-shaped depression toward the magnetic ring.
The double-tone double-membrane pneumatic tweeter according to claim 7, wherein the sound holes are all distributed in the horn-shaped depressions, and the sound holes in each of the horn-shaped depressions are circular. Arranged at equal angles.
The double-tone double-film pneumatic tweeter according to claim 1, wherein the magnetic ring is made of magnetic steel.
The double-tone and double-membrane pneumatic tweeter according to claim 1, characterized in that the structure of the first panel is completely the same as that of the second panel, and the structure of the first sound membrane is exactly the same as that of the second sound membrane.