CN114125665A

CN114125665A - Double-tone double-membrane pneumatic tweeter

Info

Publication number: CN114125665A
Application number: CN202111571585.9A
Authority: CN
Inventors: 陈坚强
Original assignee: Guoying Electronics Huizhou Co ltd
Current assignee: Guoying Electronics Huizhou Co ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-03-01
Also published as: WO2023115995A1

Abstract

The invention relates to the technical field of loudspeakers, and provides a double-tone double-membrane pneumatic tweeter, which comprises: the major structure, the major structure includes panel one, panel two, the magnetic ring, sound membrane one and sound membrane two, all be equipped with the sound hole on panel one and the panel two, magnetic ring fixed mounting is between panel two and panel one, sound membrane one encapsulates between panel one and magnetic ring, sound membrane two encapsulates between panel two and magnetic ring, form airtight space between sound membrane two and the sound membrane one, the air has in the airtight space, the major structure still includes the damping plate, damping plate fixed mounting is in the inside of magnetic ring, and the damping plate is made by the wool felt. The double-tone double-membrane pneumatic tweeter provided by the invention widens the working frequency range of the pneumatic tweeter, effectively improves the nonlinear harmonic distortion of the sound membrane, and solves the problem that the mechanical damping is difficult to solve by a single membrane and solves the industrial problem by the damping plate arranged between the first sound membrane and the second sound membrane.

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

The loudspeaker is actually a conversion equipment for converting electric energy into sound, when different electronic energy is transmitted to the coil, the coil generates magnetic field interaction of energy and the magnet, the interaction causes paper disc vibration, because the electronic energy changes at any time, the coil of the loudspeaker can move forwards or backwards, so that the paper disc of the loudspeaker can move along with the paper disc, and the action causes the density degree of air to change to generate sound.

The working frequency range of the existing pneumatic tweeter is small, the nonlinear harmonic distortion of a sound film is serious, the problem that the mechanical damping is difficult to solve by a single diaphragm exists, and the problem of the industry also exists.

Therefore, a double-tone double-membrane pneumatic tweeter is provided.

Disclosure of Invention

The invention aims to widen the working frequency range of the pneumatic tweeter, effectively improve the nonlinear harmonic distortion of the sound film, solve the difficult problem that the single diaphragm is difficult to solve the mechanical damping and solve the industrial problem, and provides the double-tone double-film pneumatic tweeter.

The specific technical scheme is as follows:

a dual-tone dual-membrane pneumatic tweeter comprising:

the main body structure comprises a first panel, a second panel, a magnetic ring, a first sound film and a second sound film, sound holes are formed in the first panel and the second panel, the magnetic ring is fixedly installed between the second panel and the first panel, the first sound film is packaged between the first panel and the magnetic ring, the second sound film is packaged between the second panel and the magnetic ring, a closed space is formed between the second sound film and the first sound film, and air is arranged in the closed space.

As a preferable scheme of the invention, the main body structure further comprises a damping plate, the damping plate is fixedly installed inside the magnetic ring, and the damping plate is made of wool felt.

As a preferable mode of the present invention, the second sound diaphragm and the sound diaphragm are symmetrically distributed on both sides of the damping plate.

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

As a preferable scheme of the present invention, threading grooves for passing through the positive and negative connecting wires are provided on both the inner side surface of the first panel and the inner side surface of the second panel.

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

As a preferable aspect of the present invention, the center positions of the first panel and the second panel both form a horn-shaped recess toward the magnetic ring.

As a preferable scheme of the present invention, the sound holes are all distributed at the trumpet-shaped depressions, and the sound holes at each trumpet-shaped depression are all arranged in an annular equal angle.

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

In a preferred embodiment of the present invention, the first panel and the second panel have the same structure, and the first sound diaphragm and the second sound diaphragm have the same structure.

The invention has the following beneficial effects:

1. the first sound film and the second sound film are integrated through the air bag type closed space, so that the structural strength of the sound film is enhanced, the split vibration of the sound film is reduced, and the harmonic distortion is reduced;

2. the nonlinear harmonic distortion of the sound film is improved by utilizing the air damping of the air bag type closed space;

3. the first sound film and the second sound film of the air bag type closed space structure are symmetrically arranged back to back, and nonlinear distortion generated by the asymmetrical shapes of the two sound films can be counteracted in the push-pull work, so that the effect of improving harmonic distortion is achieved;

4. the damping plate is made of a mechanical damping material, namely the damping plate, is arranged between the first sound film and the second sound film in the air bag type closed space structure, the damping effect of the pneumatic diaphragm can be adjusted by selecting the damping plate made of wool felt and the number of the damping plates, so that the nonlinear harmonic distortion of the diaphragm during working is further improved and improved, the problem that the mechanical damping of a single diaphragm is difficult to solve is solved by the damping plate arranged between the first sound film and the second sound film, and the problem of the industry is solved.

Drawings

Fig. 1 is a schematic structural diagram of a dual-tone dual-membrane pneumatic tweeter according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a dual-tone dual-membrane pneumatic tweeter according to an embodiment of the present invention;

fig. 3 is a schematic front view of a dual-tone dual-membrane pneumatic tweeter according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view taken along A-A of FIG. 3;

fig. 5 is a schematic structural diagram of a first panel of a dual-tone dual-membrane pneumatic tweeter according to an embodiment of the present invention;

fig. 6 is a graph showing the frequency variation of the mono-tone membrane operating mode of the dual-tone dual-membrane pneumatic tweeter according to the embodiment of the present invention;

fig. 7 is a graph showing frequency variations of a dual-tone film positive push-pull operating mode of the dual-tone dual-film pneumatic tweeter according to an embodiment of the present invention;

fig. 8 is a graph showing frequency variations of a double-tone membrane reverse push-pull operation mode of the double-tone double-membrane pneumatic tweeter according to an embodiment of the present invention;

fig. 9 is a graph showing the improvement and comparison of harmonic distortion of a dual-tone dual-membrane pneumatic tweeter according to an embodiment of the present invention.

In the drawings:

1. a first panel; 2. a second panel; 3. a magnetic ring; 4. a damping plate; 5. a first sound film; 6. a second sound film; 7. a sound hole; 8. a threading groove.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being fixed or detachable or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The pneumatic tweeter with double sound and double membranes provided by the embodiment of the invention is shown in fig. 1-5, and comprises: the main body structure comprises a panel I1, a panel II 2, a magnetic ring 3, a sound film I5 and a sound film II 6, sound holes 7 are formed in the panel I1 and the panel II 2, the magnetic ring 3 is fixedly installed between the panel II 2 and the panel I1, the sound film I5 is packaged between the panel I1 and the magnetic ring 3, the sound film II 6 is packaged between the panel II 2 and the magnetic ring 3, a closed space is formed between the sound film II 6 and the sound film I5, and air is arranged in the closed space.

As shown in fig. 1-4, the main structure further includes a damping plate 4, the damping plate 4 is fixedly installed inside the magnetic ring 3, the damping plate 4 is made of wool felt, and the thickness of the damping plate 4 can be determined according to actual process standards.

Adopt above-mentioned technical scheme's pneumatic tweeter of two membranes of two tones mainly comprises panel one 1, panel two 2, magnetic ring 3, sound membrane one 5 and sound membrane two 6 for this pneumatic tweeter of two membranes of two tones simple structure is particularly suitable for mass production.

The working principle is as follows: a closed space (an air bag type space) is formed among the magnetic ring 3, the first sound film 5 and the second sound film 6, and air (air is used as a medium) is arranged in the closed space, so that the first sound film 5 and the second sound film 6 can be integrated through air interaction, and in operation, the first sound film 5 and the second sound film 6 can perform mutual push-pull, mutual damping and mutual compensation through the air in the closed space to perform operation;

meanwhile, in operation, a closed space structure formed among the magnetic ring 3, the first sound film 5 and the second sound film 6 plays an important role in improving nonlinear harmonic distortion of pneumatic high-pitch sound.

The invention has the following four aspects for improving nonlinear harmonic distortion:

1. the first sound film 5 and the second sound film 6 are integrated through the air bag type closed space, so that the structural strength of the sound films is enhanced, the split vibration of the sound films is reduced, and the harmonic distortion is reduced;

3. the first sound film 5 and the second sound film 6 of the air bag type closed space structure are symmetrically arranged back to back, and nonlinear distortion generated by the asymmetrical shapes of the two sound films can be counteracted in the push-pull work, so that the effect of improving harmonic distortion is achieved;

4. in the air bag type closed space structure, the damping plate 4 which is a mechanical damping material is arranged between the first sound film 5 and the second sound film 6, and the damping effect of the pneumatic diaphragm can be adjusted by selecting the damping plate 4 made of wool felt and the number of the damping plates, so that the nonlinear harmonic distortion of the diaphragm during working is further improved and improved.

The damping plate 4 arranged between the first sound film 5 and the second sound film 6 solves the problem that the single diaphragm is difficult to solve the mechanical damping, so that the industrial problem is solved.

It should be noted that the specific material of the damping plate 4 may be adjusted according to the application of the speaker and the requirements of the application scenario, such as the material (damping coefficient) of the damping plate and the thickness (number and density) of the damping material. In practical application, the damping plate 4 can be flexibly adjusted, and in the embodiment, the damping plate 4 is made of wool felt, so that the damping effect of the pneumatic diaphragm adjusted by the damping plate 4 made of wool felt is better.

Specifically, in this embodiment:

1. single voice diaphragm working mode: the circuit is only connected with one group of diaphragms (one of the first diaphragm 5 and the second diaphragm 6) to work, when the single diaphragm works, one group of diaphragms are in an active working state, the other group of diaphragms are driven to work passively through air coupling in the air bag type closed space structure, the mode forms a double-resonance peak state, the working frequency range of the diaphragms is wider, one group of diaphragms actively radiate sound, the other group of diaphragms passively radiate sound, front and back radiation inverted 8-shaped directivity is formed, and the front radiation sound pressure is about 6db higher than the back radiation sound pressure.

2. Double-sound-film positive push-pull working mode: two groups of diaphragms (a first diaphragm 5 and a second diaphragm 6) on a circuit work in opposite phases (the same is in series connection and parallel connection), when the double diaphragms work, as the double diaphragms are arranged back to back and connected in opposite phases, the double diaphragms are in the push-pull vibration state in the same direction and both work actively and drive the push-pull mutually, the mode forms a single resonance peak state, but the resonance frequency is lower, the resonance peak is higher, the output sound pressure is higher, the working frequency range of the sound diaphragm at the moment is widest, and the output sound pressure is about 3db higher than that of the single diaphragm mode. Because the double-film actively radiates before and after working, the double-film also presents the inverted 8-shaped directivity. It features that the front and back radiation sound pressures are same but the sound phases are opposite.

3. Double-sound film anti-push-pull working mode: two sets of diaphragms (a diaphragm one 5 and a diaphragm two 6) work in the same phase (in series and in parallel) on the circuit at the same time. When the double-sound film works, the double-sound film is arranged back to back and the circuits are connected in phase, the double-sound film is in a reverse opposite push-pull vibration state, the double-sound film works actively and drives the double-sound film to push and pull reversely, a single resonance peak state is formed in the mode, however, the resonance frequency is higher, and the frequency response curve shifts to the high frequency direction. The working frequency range of the sound film is narrow, and the output sound pressure is the same as the positive push-pull working mode of the double sound films. Because the double-film actively radiates before and after working, the double-film also presents the inverted 8-shaped directivity. It features the same front and back radiation sound pressure, narrow frequency response range and the same sound phase.

Specifically, in the present embodiment, in order to further improve the nonlinear harmonic distortion of the first and

second diaphragms

5 and 6 during operation, the second and

first diaphragms

6 and 5 are symmetrically disposed on two sides of the damping plate 4.

Specifically, in this embodiment, as shown in fig. 2, in order to facilitate the connection between the second sound film 6 and the first sound film 5, the second sound film 6 and the first sound film 5 are provided with positive and negative connection lines, and the positive and negative connection lines extend to the outside of the main structure, so as to facilitate the connection through the positive and negative connection lines.

Specifically, in this embodiment, as shown in fig. 2, in order to facilitate the leading-out of the positive and negative connecting wires, threading grooves 8 for passing through the positive and negative connecting wires are provided on the inner side surface of the first panel 1 and the inner side surface of the second panel 2.

Specifically, in the present embodiment, as shown in fig. 1-4, in order to eliminate the interference of the first panel 1 and the second panel 2 on the second sound film 6 and the first sound film 5, the first panel 1 and the second panel 2 are both made of plastic, and the first panel 1 and the second panel 2 are both circular.

Specifically, in the present embodiment, as shown in fig. 2, in order to improve the sound quality of the dual-tone dual-membrane pneumatic tweeter, the center positions of the panel 1 and the panel 2 are both formed into horn-shaped recesses toward the magnetic ring 3, the sound holes 7 are distributed in the horn-shaped recesses, and the sound holes 7 in each horn-shaped recess are all arranged in an annular equal angle.

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

Specifically, in the present embodiment, in order to further improve and improve the nonlinear harmonic distortion of the dual-tone dual-membrane pneumatic tweeter during operation, as shown in fig. 2, the structures of the panel one 1 and the panel two 2 are completely the same, the panel one 1 and the panel two 2 are symmetrically disposed, the structures of the diaphragm one 5 and the diaphragm two 6 are completely the same, and the diaphragm one 5 and the diaphragm two 6 are symmetrically disposed.

Specifically, in this embodiment, the performance of the dual-tone dual-membrane pneumatic tweeter provided in this embodiment is tested as follows:

As can be seen from the data shown in fig. 6 to 9, the dual-tone dual-membrane pneumatic tweeter provided by the present embodiment has the following advantages:

4. the mechanical damping material, namely the damping plate 4, is arranged between the first sound film 5 and the second sound film 6 in the air bag type closed space structure, the damping effect of the pneumatic diaphragm can be adjusted by selecting the damping plate 4 made of wool felt and the number of the damping plates, so that the nonlinear harmonic distortion of the diaphragm during working is further improved and improved, the problem that the mechanical damping of a single diaphragm is difficult to solve is solved by the damping plates 4 arranged between the first sound film 5 and the second sound film 6, and the problem of the industry is solved.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a pneumatic tweeter of two sound bimembranes which characterized in that includes:

2. The dual-tone dual-membrane pneumatic tweeter of claim 1, wherein the main structure further comprises a damping plate fixedly mounted inside the magnetic ring, and the damping plate is made of wool felt.

3. The dual-tone dual-membrane pneumatic tweeter of claim 2, wherein the second membrane is symmetrically disposed on both sides of the damping plate.

4. The dual-tone dual-membrane pneumatic tweeter of claim 3, wherein the second membrane and the first membrane each have positive and negative connecting wires, and the positive and negative connecting wires extend to the outside of the main structure.

5. The pneumatic tweeter of claim 4, wherein the inner surface of the first panel and the inner surface of the second panel are provided with threading slots for passing through the positive and negative connecting wires.

6. The dual-tone dual-membrane pneumatic tweeter of claim 5, wherein the first and second panels are made of plastic and are circular.

7. The dual-tone dual-membrane pneumatic tweeter of claim 6, wherein the center of each of the first and second panels forms a horn-like recess toward the magnetic ring.

8. The dual-tone dual-membrane pneumatic tweeter of claim 7, wherein the sound holes are distributed in the horn-shaped recesses, and the sound holes in each of the horn-shaped recesses are circumferentially arranged at equal angles.

9. The dual-tone dual-membrane pneumatic tweeter of claim 1, wherein the magnetic ring is made of magnetic steel.

10. The dual-tone dual-membrane pneumatic tweeter of claim 1, wherein the first panel and the second panel are identical in structure, and the first membrane and the second membrane are identical in structure.