WO2006042448A1

WO2006042448A1 - Loudspeaker diaphragm

Info

Publication number: WO2006042448A1
Application number: PCT/CN2005/000644
Authority: WO
Inventors: Guang Cheng
Original assignee: Guang Cheng
Priority date: 2004-10-21
Filing date: 2005-05-10
Publication date: 2006-04-27
Also published as: CN1764327A

Abstract

The present invention relates to a loudspeaker and diaphragm thereof, especially to a loudspeaker diaphragm that can reduce the divided vibration, decrease the distortion, and make the vibration of the diaphragm well responsive to the driven signal to attain a HI-Fl reproduced effect. The diaphragm have main ribs and sub ribs, the main ribs are arranged at the location from which the loudspeaker diaphragm are connected to the voice coil, and extend along the radial direction of the diaphragm. The sub ribs are set in the direction which crosses the radial direction. The main ribs are perpendicular to the excircle of the voice coil, and the sub ribs are perpendicular to the main ribs. Compared to the existing technology, by using the ribs construction, the present invention improves the buckling strength of the diaphragm, especially reduces the divided vibration and the distortion, improves the efficiency and the rigidity of the diaphragm, and enables the vibration of the diaphragm well responsive to the driven signal. Thus a HI-Fl loudspeaker diaphragm made by less expensive materials can be attained.

Description

Speaker diaphragm technology

The present invention relates to a speaker and a diaphragm thereof, particularly a speaker diaphragm which can reduce splitting vibration, reduce distortion, and cause the vibration of the diaphragm to follow the driving signal well, in order to achieve a high-fidelity playback effect.

Background technique

As shown in Fig. 10, the conventional speaker is mainly composed of a folding ring 1, a voice coil 4, a diaphragm 5, a magnetic conducting plate and a magnetic guiding column 6, a bracket 7, a centering piece 8, a magnetic conducting plate 9, and a magnet 10. When the signal current flows through the voice coil 4, the voice coil 4 is moved by the electromagnetic force in the magnetic field, and the voice coil 4 is connected to the root of the diaphragm 5 to drive the diaphragm 5 to move, and the force is transmitted from the root of the diaphragm 5, Acting on the air before and after it, it vibrates to make a sound. The ideal motion of the loudspeaker diaphragm 5 is linear with the change of the electrical signal. The air vibration before and after it is linear with the change of the electrical signal. The ideal loudspeaker can re-discharge the signal without distortion. The actual speaker is not uniform due to the magnetic field, the nonlinearity of the centering piece 8, the deformation and distortion of the diaphragm 5, and the nonlinearity of the ring 1 cause nonlinear distortion of the reproduced sound. The coil 4, the magnet 10, the centering piece 8, and the folding ring 1 have different roles in vibration, but the vibration mode is relatively simple. The diaphragm 5 is different. The sound coil is connected to the voice coil 4, and the driving force is transmitted to the entire diaphragm 5. The diaphragm is restrained by the elastic constraint of the ring 1 and the elasticity of the air. The conventional speaker The diaphragm 5 can be regarded as a flexible body, which deforms itself and generates resonance during the transmission of force, so that the entire vibration process becomes very complicated and the distortion is large. Traditional speakers are a lot more complicated The spring vibration system is difficult to simplify as an equivalent system for calculation. So today, when computing technology is so developed, it is still impossible to calculate it accurately.

The existing speaker diaphragms mainly include the following: 1), the diaphragm is a homogeneous thick film, 2), the diaphragm is a unequal thick film, ₃₎ , the diaphragm is a coated composite film, 4), the diaphragm For the sandwich composite membrane, 5), the diaphragm is a diaphragm with a ring-shaped rib, 6), the diaphragm is a pleated diaphragm with a pleated rib. For example, the first edition of the book "Practical Speaker Technology Handbook" published by the Defense Industry Press and edited by Wang Yizhen (April 2003) points out the problems of existing speakers on pages 62-71. For different frequencies, the diaphragm produces a circular or radial split vibration. In addition to this steady-state split vibration, transient characteristics are exacerbated. The force transmitted by the voice coil causes the diaphragm to deform, and the elastic force generated by the deformation gradually propagates outward. When the transmission is not completed, the signal reversals cancel each other out. Therefore, it is particularly important to reduce the radial deformation of the speaker diaphragm. The main disadvantages of the traditional method are: 1) Thickening the diaphragm will increase the quality of the vibrating body, increase the inertia, and reduce the sensitivity. 2), the sandwich composite film increases the manufacturing cost, increases the quality of the vibrating body, and the transient response is not good. 3), the composite film has limited ability to resist distortion and has limited ability to suppress vibration. 4), corrugated (pleated) type ribs (ribs) The diaphragm has limited resistance to twisting and deformation, and the splitting vibration suppression ability is limited. The corrugated reinforcing ribs are often formed into a ring shape, which can suppress radial (radial) splitting vibration and cannot suppress the ring. The vibration is divided to reduce the intensity of the vibration force transmission direction, and the circular segmentation vibration is more serious. If the radial (radial) setting is used, the ring-shaped segmentation vibration can be suppressed, and the radial (radial) segmentation vibration cannot be suppressed, and the vibration can be reduced. The strength perpendicular to the direction of vibrational vibration makes the radial splitting vibration more serious. If corrugated (pleated) ribs (ribs) are provided in two directions perpendicular to each other, the folds in two directions will be generated. The ring vibration produces many complex small resonances that distort the sound. 5), high-strength materials such as carbon fiber have a certain effect on improving the rigidity-quality ratio of the diaphragm, but The price is high.

The traditional scheme has a certain effect on improving the sound quality of the speaker, but it can not avoid the defects of the "membrane" type vibration. The main disadvantage of "membrane" vibration is that its vibration does not follow the signal very well. Like the tympanic membrane, the drumstick hits (drive signal), the tympanic membrane vibrates for a long time (not synchronized with the drive signal), and there is resonance and distortion.

Figure 10 is a cross-sectional view of a conventional speaker, Figure 1 1-1, Figure 1 1 - 2, Figure 1 1 - 3, Figure 1 1-4 is a schematic diagram of diaphragm deformation (steady state) when the voice coil is displaced upward; 12- 1~ Figure 12-6 shows the distortion (dynamic) of the diaphragm when the voice coil vibrates up and down. In Figure 12-5, the vibration phases of a and b are opposite, and the sound energy emitted by each other cancels. For some frequencies, the resonance shown in Figure 12-6 is formed on the diaphragm, and the acoustic energy loss is greater, which is the main cause of the poor intermediate frequency characteristics of the speaker.

Summary of the invention

In view of the problems existing in the conventional speaker diaphragm, the present invention provides a novel speaker diaphragm which can effectively reduce the radial and circumferential deformation of the diaphragm, and performs overall motion under the action of the driving signal instead of "membrane" vibration. Its motion can better follow the drive signal, achieving the purpose of reducing distortion, improving efficiency, and reproducing high sound quality.

The technical solution for achieving the above object of the present invention is as follows: The main keel is provided with a main keel and a sub keel, and the main keel is disposed outwardly from the joint between the speaker diaphragm and the voice coil, and the auxiliary keel is disposed in a direction crossing the same.

The main keel of the diaphragm of the present invention is perpendicular to the outer circle of the voice coil, and the secondary keel is perpendicular to the main keel.

The main and auxiliary keels of the present invention are disposed on the back or front side of the diaphragm.

The main and auxiliary keels of the present invention are disposed on the same side of the diaphragm or on both sides of the diaphragm. The primary and secondary keels of the present invention are hollow or solid.

The shape of the diaphragm of the present invention is tapered, dome-shaped, elliptical or planar.

The main keel of the diaphragm of the present invention is arranged in the same direction as the normal direction of the voice coil. The angle between the main and auxiliary keels of the present invention is 60°~120.

The speaker of the present invention comprises a speaker diaphragm with a main sub-keel, the root of which is connected to the voice coil; and a magnetic circuit is also provided at the same time.

The speaker of the present invention further comprises a folding ring, a magnetic conductive plate and a magnetic conductive column, a bracket, a centering piece, a magnetic conductive plate and a magnet, and the folding ring is connected to the outer end of the diaphragm and the bracket, and the bracket passes through the magnetic conductive plate and the magnet Connected; the magnetic column is located at the core of the magnet.

Compared with the prior art, the invention greatly improves the anti-twisting strength of the diaphragm due to the use of the keel structure, in particular, can reduce the splitting vibration, reduce the distortion, improve the efficiency, improve the rigidity-to-mass ratio of the diaphragm, and vibrate the diaphragm. The drive signal is well followed, thereby improving the synchronization of the vibration of the diaphragm following the electrical signal, and the speaker with excellent sound quality can be produced with less expensive materials, achieving high fidelity playback.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view showing the structure of a speaker according to a preferred embodiment of the present invention.

Figure 2 is a bottom plan view of the diaphragm of Figure 1.

Figure 3 is a front elevational view of the diaphragm of Figure 1.

Figure 4 is a cross-sectional view taken along line B-B' of the diaphragm of Figure 2;

Figures 5-1, Figures 5-2, and 5-3 are schematic views of other embodiments of the modification of the A-A' cross-sectional view of Figure 3 in accordance with an embodiment of the present invention. The shape of the keel section varies from hollow to solid or solid.

Figure 6 is another embodiment of a modification of the cross-sectional view taken along line A-A' of Figure 3 in accordance with an embodiment of the present invention. The main keel and the secondary keel are respectively disposed on both sides of the diaphragm. 7' and 7 are schematic views of the assembly process of the keel.

Figures 8' and 8 are schematic views of the assembly process of another keel.

Figure 9 is a schematic illustration of an embodiment of a modification in accordance with an embodiment of the present invention.

Fig. 10 is a schematic structural view of a conventional speaker.

Figure 1 1- 1 to Figure 1 1 - 4 is a schematic diagram of displacement deformation of a conventional loudspeaker diaphragm.

Figure 12-1 to Figure 12-6 are schematic diagrams showing vibration distortion of a conventional speaker diaphragm.

detailed description

The invention will now be described in further detail by way of specific examples and in conjunction with the accompanying drawings.

For ease of understanding, a brief description of the structure of the present invention will be made prior to describing a particular embodiment. Referring to Fig. 1, there is shown a speaker comprising a folding ring 1, a voice coil 4, a diaphragm 5, a magnetic conducting plate and a magnetic guiding column 6, a bracket 7, a centering piece 8, a magnetic conducting plate 9 and a magnet 10 Etc., the folding ring 1 is connected to the diaphragm 5 and the outer end of the bracket, the bracket is connected to the magnet 10 via the magnetic conductive plate 9, the root of the diaphragm 5 is connected to the voice coil 4, and the magnetic column 6 is located at the core of the magnet 10. .

As shown in FIG. 2, FIG. 3 and FIG. 4, the diaphragm 5 is provided with a main keel 3 and a sub keel 2, and the main keel 3 is disposed outwardly from the joint of the speaker diaphragm 5 and the voice coil 4 (radial direction). The sub keel 2 is disposed in a direction perpendicular (intersecting) thereto, and the main keel 3 of the diaphragm 5 is perpendicular to the outer circumference of the voice coil 4. The vibration force of the voice coil 5 is transmitted in the direction of the main keel 3. Due to the presence of the main keel 3, the deformation of the diaphragm 5 in the direction of vibrational force transmission is small; likewise, due to the presence of the secondary keel 2, the diaphragm 5 is on its circumference. The deformation in the direction is also small; the splitting vibration is small, the acoustic energy loss due to diaphragm resonance is reduced in the middle and high frequency bands, the distortion is small, and the frequency response is greatly improved. Due to the presence of the secondary keel 2 and the main keel 3, the rigidity and strength are greatly improved compared with the conventional diaphragm, and the diaphragm can be made thinner and thinner than the conventional speaker diaphragm, and the overall strength is strong. Higher degrees.

The main keel transmits the vibration of the voice coil evenly and effectively to the diaphragm 5, which greatly reduces the radial deformation of the diaphragm. The secondary keel strengthens the strength of the diaphragm in the other direction, reduces the zonal resonance, and makes the diaphragm integrally Synchronize with the voice coil.

As shown in Fig. 7', a diaphragm is pressed into a tapered basin of a horizontal and vertical groove, and the other diaphragm is pressed into a tapered basin which can be closely adhered to the tapered surface of the diaphragm (similar to the conventional one). The diaphragm is coated with glue between the two diaphragms and bonded together. As shown in Fig. 7, a keel diaphragm as shown in Fig. 3 is formed.

Another method is to bond the keel shown in Fig. 8' to a tapered basin (similar to a conventional diaphragm) to form a structure as shown in Fig. 8.

It can also be molded into a diaphragm with a keel using a one-shot method.

Fig. 6 shows another embodiment of the modification of the A-A' sectional view of Fig. 3 according to an embodiment of the present invention, in which the main keel and the secondary keel are respectively disposed on both sides of the diaphragm.

As shown in Fig. 9, the diaphragm with a keel can also be directly pressed into a diaphragm.

The present invention can also employ a keel in one direction and a corrugated rib in the other direction.

When the speaker diaphragm can be approximated as a rigid body, the speaker vibration system can be simplified, and the calculation result will be closer to the real situation. The concept of "film" will be weakened, and it should be more accurate to refer to the speaker "vibration" as the speaker "vibration body". Choosing a lightweight, strong material structure is an important means of improving speaker quality.

The main and auxiliary keels of the present invention may be provided on the back surface of the diaphragm or on the front surface of the diaphragm; the main keel and the sub keel may be provided on the same side of the diaphragm, or may be provided on both sides of the diaphragm. The cross section of the keel can be made into various shapes, either hollow or solid; the material of the keel can be the same as or different from the diaphragm. The shape of the diaphragm can be Conical, dome-shaped, elliptical or flat.

The direction of the main keel of the present invention may be the same as or different from the normal direction of the voice coil (there may be a certain angle), the keel may be formed together with the diaphragm or may be attached by pasting or other methods; between the main and the auxiliary keels Can be perpendicular to each other or not perpendicular. The length of the keel is the same as the inside of the diaphragm (connected to the voice coil) (connected to the loop). The distance between the loops can be equal or different. The length of each main keel can be equal or different. The cross section of each main keel. They may be equal or different, and the sections of different positions of the same main keel may be equal or different.

Claims

Rights request

A speaker diaphragm, characterized in that: the diaphragm (5) is provided with a main keel (3) and a sub keel (2), and the main keel (3) is from a speaker diaphragm (5) and a voice coil ( 4) Set the joint to the outward direction and set the secondary keel (2) in the direction intersecting it.

2. The loudspeaker diaphragm according to claim 1, wherein: the main keel (3) of the diaphragm (5) is perpendicular to the outer circumference of the voice coil (4), the secondary keel (2) and the main keel

(3) Vertical.

The speaker diaphragm according to claim 1 or 2, characterized in that the main and auxiliary keels (3, 2) are provided on the back or front side of the diaphragm (5).

The speaker diaphragm according to claim 1 or 2, wherein the main and auxiliary keels (3, 2) are disposed on the same side of the diaphragm (5) or on both sides of the diaphragm (5) .

The speaker diaphragm according to claim 1 or 2, characterized in that the main and auxiliary keels (3, 2) are hollow or solid.

The speaker diaphragm according to claim 1 or 2, wherein: the diaphragm

The shape of (5) is a cone, a dome, an ellipse or a plane.

The speaker diaphragm according to claim 1, wherein the main keel (3) of the diaphragm (5) is disposed in the same direction as the normal direction of the voice coil (4).

The speaker diaphragm according to claim 1 or 2, characterized in that the angle between the main and auxiliary keels (3, 2) is 60 to 120.

A speaker, characterized in that the speaker comprises the speaker diaphragm (5) according to claim 1 or 2, the root of the speaker diaphragm (5) being connected to the voice coil (4); There is also a magnetic circuit.

10. The speaker according to claim 9, wherein: the speaker further comprises a folding ring (1), a magnetic conducting plate and a magnetic guiding column (6), a bracket (7), and a centering piece (8) , the magnetic conductive plate (9) and the magnet (10), the folding ring (1) is connected to the outer end of the diaphragm (5) and the bracket (7), and the bracket (7) is connected to the magnet (10) via the magnetic conductive plate (9) ; The magnetic column (6) is located at the core of the magnet (10).