WO2013100862A2

WO2013100862A2 - Mirror vibration speaker

Info

Publication number: WO2013100862A2
Application number: PCT/SG2013/000071
Authority: WO
Inventors: Shihuang Li
Original assignee: Shihuang Li
Priority date: 2011-12-31
Filing date: 2013-02-22
Publication date: 2013-07-04
Also published as: WO2013100862A3

Abstract

This invention discloses a kind of mirror vibration speaker. A characteristic is that it contains a sealed speaker body. There is an output unit on top of this speaker body and this output unit includes at least one cone hole and one diaphragm hole; the loudspeaker unit is loaded on the said cone hole and sealed; the passive radiation unit has a passive diaphragm, and it is loaded on the said diaphragm hole and sealed; the vibration direction of the loudspeaker unit is the same as the vibration direction of the passive diaphragm of the said passive radiation unit; there is another mirror unit that has mirror symmetry in the opposite direction of the said vibration direction with the said output unit, as well as the above loudspeaker unit and passive radiation unit. The cone and passive diaphragm of the loudspeaker unit for this technical plan vibrate in a mirror manner in the same direction and with the same force. The instant momentum balance between the left and right of the entire speaker body prevents the vibration of the speaker body from causing a large number of additional and irrelevant harmonic waves which will result in coloration. This technical plan thus achieves a speaker with small volume and quality sound.

Description

Mirror Vibration Speaker

Technical Field

This invention involves a kind of speaker with mirror vibration characteristic.

Background Technology

There is a wide range of applications for the speaker in portable electric-acoustic conversion equipment. Relying on only a small volume, it is required to transform electrical audio signals to audio frequency while keeping the output true to the original sound. Based on the characteristics of the existing general electromagnetic loudspeaker speaker, there is a mutual constraint on performance and volume. When the volume becomes smaller, the sound restoration performance gets poorer, especially in the medium and low frequency bands; if phase inverter tubes, labyrinths and horns are additionally fitted based on the traditional method, the performance improvement is very limited. At the same time, it is inevitable that the speaker body will increase in volume and the internal structure will become complex. On the other hand, when the electromagnetic loudspeaker or passive diaphragm on the speaker body vibrates under high energy, it is inevitable that the speaker will have an impulse in the opposite direction. This causes severe vibration for the speaker body and unnecessary resonance for many of its parts. Consequently, the sound output is distorted due to coloration; in view of this, an effective plan to solve this problem is to make the speaker body solid and heavy. However, this is in direct conflict with its portability.

Invention Content

Pertaining to the above problems of coloration and poor restoration at medium and low frequencies for the portable speaker, this invention proposes a kind of mirror vibration speaker. Its technical plan is as follows:

The mirror vibration speaker contains a sealed speaker body. There is an output unit on top of this speaker body and this output unit includes at least one cone hole and one diaphragm hole; the loudspeaker unit is loaded on the said cone hole and sealed; the passive radiation unit has a passive diaphragm, and it is loaded on the said diaphragm hole and sealed; the vibration direction of the loudspeaker unit is the same as the vibration direction of the passive diaphragm of the said passive radiation unit; there is another mirror unit that has mirror symmetry in the opposite direction of the said vibration direction with the said output unit, as well as the above loudspeaker unit and passive radiation unit.

Below are several preferred improvements for this technical plan:

In a preferred embodiment, the said cone hole and diaphragm hole lie flat on one side of the mounting surface of the said output unit; there can be two further improvements: In a preferred embodiment, the spacing between both sides of the said mounting surface is smaller than the cone diameter of the said loudspeaker unit; in another preferred embodiment, the said loudspeaker unit and passive radiation unit cover the said mounting surface.

In a preferred embodiment, the effective area of the passive diaphragm on the said output unit is not smaller than the effective cone area of the said loudspeaker unit.

In a preferred embodiment that is based on a plan with mounting surface, there is a positioning column fastened between both sides of the said mounting surface at the periphery of the said loudspeaker unit or passive radiation unit.

In a preferred embodiment, the said loudspeaker unit is located in the said speaker body and it is loaded on the said cone hole using the back loading method.

In a preferred embodiment, the said loudspeaker unit is located outside the said speaker body and it is loaded on the said cone hole using the front loading method.

The beneficial effects of this invention are:

1. When the loudspeaker unit and its mirror are driven by the same audio signal, their cones will vibrate in a mirror manner in the same direction and with the same force. At the same time, the passive diaphragms will also vibrate in a mirror manner in the same direction and with the same force. There is thus instant momentum balance between the left and right for the entire speaker body. Even when driven by high power, the severe vibration of the passive diaphragms will also cancel out in the left and right mirror directions. This will prevent the vibration of the speaker body from causing a large number of additional and irrelevant harmonic waves which will result in coloration.

2. The sound will be emitted from both sides and it will radiate all around. It has the "true sound effect" which simulates the actual sound source. At the same time, this invention helps to achieve thin speakers that are small and compact. It also allows a multiple cascade modular form.

3. The form of a sealed speaker body with passive diaphragm is conducive to sound restoration. In particular, a thin speaker body helps to improve the load of the loudspeaker unit and restore to a high degree sound signals at medium and low frequencies.

4. The loudspeaker unit and passive radiation unit lie flat over the entire mounting surface. This is conducive to maximizing the utilization of the speaker body surface.

5. The structure with an additional positioning column improves the strength of the speaker body. This further prevents additional vibration for the speaker body which will cause coloration.

Description of Attached Diagrams

The following diagrams provide further description for the embodiments of this invention:

Figure 1 is the sectional schematic diagram for embodiment 1 of this invention;

Figure 2 is the left view diagram for the embodiment in Figure 1 ;

Figure 3 is the cutaway view diagram for embodiment 2 of this invention;

Figure 4 is the left view diagram for the embodiment in Figure 3;

Figure 5 is the cutaway view diagram for embodiment 3 of this invention;

Figure 6 is the cutaway view diagram for embodiment 4 of this invention;

Figure 7 is the left view diagram for the embodiment in Figure 6.

Description of Preferred Embodiments

Embodiment 1 :

As per Figure 1 , the sectional schematic diagram for embodiment 1 of this invention; Figure 2 is the left view diagram for the embodiment in Figure 1; the following explanation is with reference to these two diagrams:

Speaker body 1 is a box body with six symmetrical sides. It has an output unit 10 on its left and this output unit includes a flat mounting surface 13. Mounting surface 13 has a cone hole 11 and a diaphragm hole 12. A loudspeaker unit 21 is located in speaker body 1 and it is loaded on the said cone hole 11 using the back loading method; a passive radiation unit 22 is loaded on the diaphragm hole 12; further, loudspeaker unit 21 and passive radiation unit 22 are sealed with the mounting surface. Therefore, speaker body 1 is in a sealed state. Passive radiation unit 22 has a passive diaphragm 23. When loudspeaker 21 is driven to vibrate, passive diaphragm 23 will be driven to resonate by the air within speaker body space 2.

The vibration direction of the cone of loudspeaker unit 21 is the same as the vibration direction of passive diaphragm 23 of passive radiation unit 22 i.e. the horizontal arrow in Figure 1 ; there is another mirror unit 10' that has mirror symmetry in the opposite direction of the said vibration direction with output unit 10, as well as the above loudspeaker unit 21 and passive radiation unit 22. Therefore with this structure, when loudspeaker unit 21 and its mirror 21' are simultaneously driven using the same audio signal, their cones will vibrate in a mirror manner in the same direction and with the same force. At the same time, passive diaphragms 23 and 23' will also vibrate in a mirror manner in the same direction and with the same force. There is thus instant momentum balance between the left and right for the entire speaker body. Even when driven by high power, the severe vibration of passive diaphragms 23 and 23' will also cancel out in the left and right mirror directions. This prevents the vibration of speaker body 1 from causing a large number of additional and irrelevant harmonic waves which will result in coloration; at the same time, passive diaphragms 23 and 23' have both been designed to resonate with loudspeaker units 21 and 21' in a certain low frequency band. This causes the output sound of speaker body 1 to have good output in the same direction and there will be no phenomenon of acoustic short circuit. Therefore, on the one hand, coloration caused by the vibration of the speaker body is avoided; on the other hand, it ensures the restoration capability of the entire speaker at medium and low frequencies.

Embodiment 2:

Figure 3 is the cutaway view diagram for embodiment 2 of this invention; Figure 4 is the left view diagram for the embodiment in Figure 3; the following explanation is with reference to these two diagrams:

The mirror manner of loudspeaker units 21 and 21', as well as passive radiation units 22 and 22', is similar to the case for embodiment 1. The difference is that in this embodiment, compared with thickness H of speaker body 1 i.e. the spacing between both sides of the mounting surface, diameter D of loudspeaker units 21 and 21' is larger. And so, the load for the cone of the loudspeaker unit will be larger and the sound quality obtained will be further improved; in particular, because thickness H can be made smaller, the said speaker body 1 can become very thin, even to the extent of being just twice the thickness of the loudspeaker unit. It is thus suitable to be used in electroacoustic musical instruments and tablet devices. Passive diaphragms 23 and 23' on the two sides can emit sound from both sides and radiate all around. The speaker can simulate the "true sound effect" of musical instruments and other sound sources. This is one advantage which a single- sided speaker would not have. At the same time, the effective area of passive diaphragms 23 and 23' is not smaller than the effective cone area of the said loudspeaker units 21 and 21'. This further increases the load of the loudspeaker cone and raises its sound restoration effect at low frequencies.

On the other hand, the form of this speaker body 1 allows easy realization of multiple combination or cascade modular effects as per requirements. Different loudspeaker units and passive diaphragms can be selected for different frequency bands so as to achieve a rich and complete sound restoration effect.

Embodiment 3:

As per Figure 5, the cutaway view diagram for embodiment 3 of this invention; speaker body 1 in this embodiment is similar to that in embodiment 2. The difference is that its thickness can be smaller than twice the thickness of loudspeakers 21 and 21'. This further compresses the volume within speaker body space 2. Loudspeaker units 21 and 21' in this plan are secured on speaker body 1 by means of front loading. The loudspeaker body itself is located outside speaker body 1. This plan can be considered for sites where a certain thickness is required or where it is constrained. Loudspeaker units 21 and 21' will just need to be appropriately covered by other parts that are not constrained. This plan achieves the thinnest result as the thickness of speaker body 1 is no longer constrained by any internal component.

Embodiment 4:

As per Figure 6, the cutaway view diagram for embodiment 4 of this invention; Figure 7 is the left view diagram for the embodiment in Figure 6; the following explanation for embodiment 4 is with reference to these two diagrams:

Loudspeaker units 21 and 21' in this embodiment still use the back loading method and there are two each of passive radiation units 22 and 22'. The two sides of loudspeaker units 21 and 21' are laid flat on one side of the mounting surface. And so, loudspeakers units 21 and 21', as well as passive radiation units 22 and 22', cover almost the entire mounting surface. The entire outer surface of speaker body 1 is thus utilized to the maximum.

There is a positioning column 9 fastened between both sides of mounting surface 13 at the peripheries of loudspeaker units 21 and 21'. On the one hand, this positioning column reinforces the strength of the entire speaker body 1 ; on the other hand, it also effectively prevents mounting surface 13 from experiencing excessive additional vibration that will cause coloration for the sound output. Such a combination allows the small and thin speaker body 1 to have a very large advantage: it can be used in fields which have strict restrictions placed on the size. It will also not have excess vibration and the original sound will be restored to a high degree.

The description above only covers the preferred embodiments of this invention and it is not meant to limit its implementation scope i.e. any equivalent changes or modifications made within the patent scope of this invention or based on its specification content should all fall within the scope of this invention.

Claims

O 2013/100862 ' ClailTIS PCT/SG2013/000071

1. A characteristic of the mirror vibration speaker is that it contains a sealed speaker body. There is an output unit on top of this speaker body and this output unit includes at least one cone hole and one diaphragm hole; the loudspeaker unit is loaded on the said cone hole and sealed; the passive radiation unit has a passive diaphragm, and it is loaded on the said diaphragm hole and sealed; the vibration direction of the loudspeaker unit is the same as the vibration direction of the passive diaphragm of the said passive radiation unit; there is another mirror unit that has mirror symmetry in the opposite direction of the said vibration direction with the said output unit, as well as the above loudspeaker unit and passive radiation unit.

2. As per the mirror vibration speaker described in patent claim 1 , a characteristic is that the said cone hole and diaphragm hole lie flat on one side of the mounting surface of the said output unit.

3. As per the mirror vibration speaker described in patent claim 1 , a characteristic is that the effective area of the passive diaphragm on the said output unit is not smaller than the effective cone area of the said loudspeaker unit.

4. As per the mirror vibration speaker described in patent claim 2, a characteristic is that the spacing between both sides of the said mounting surface is smaller than the cone diameter of the said loudspeaker unit.

5. As per the mirror vibration speaker described in patent claim 4, a characteristic is that in the said speaker body, there is a positioning column fastened between both sides of the said mounting surface at the periphery of the said loudspeaker unit or passive radiation unit.

6. As per the mirror vibration speaker described in patent claim 1, a characteristic is that the said loudspeaker unit is located in the said speaker body and it is loaded on the said cone hole using the back loading method.

7. As per the mirror vibration speaker described in patent claim 1 , a characteristic is that the said loudspeaker unit is located outside the said speaker body and it is loaded on the said cone hole using the front loading method. O 2013/100862 Claims PCT/SG2013/000071

8. As per the mirror vibration speaker described in patent claim 2, a characteristic is that the said loudspeaker unit and passive radiation unit cover the said mounting surface.