Loudspeaker

Abstract

The utility model provides a loudspeaker, which belongs to the field of electroacoustics and comprises a basin stand, a vibrating diaphragm arranged on one side of the basin stand, a dome arranged on one side of the vibrating diaphragm facing the basin stand, a voice coil arranged on the inner side of the dome, a centering disk and a magnetic circuit arranged on the other side of the basin stand, and an auxiliary diaphragm laminated layer, the auxiliary film lamination layer is located between the cone frame and the centering support chip, one end of the auxiliary film lamination layer is fixed on the cone frame, and the other end of the auxiliary film lamination layer is fixed on the voice coil. In the working process of the loudspeaker, the piezoelectric film generates internal stress by supplying power to the piezoelectric film, so that additional force is provided for a vibration system of the loudspeaker, the downward vibration driving force and the upward vibration driving force of the vibration film are approximately consistent by adjusting the direction and the size of the applied voltage, and the BLX symmetry of the loudspeaker is improved.

Description

Technical Field

[0001] The utility model relates to a loudspeaker. Background Art

[0002] With the development of electronic devices such as mobile phones and wearables, customers have higher and higher requirements for loudspeakers, and customers have higher and higher requirements for the BLX symmetry of loudspeakers. Since the upper length and the lower length of the voice coil of the loudspeaker in the magnetic field are inconsistent, and the vibration system is affected by its own weight, the driving force of the loudspeaker when vibrating upward is smaller than that when vibrating downward, and the BLX symmetry is poor.

[0003] Generally, there are two solutions:

[0004] First: Bond a metal skeleton above the voice coil, and adjust the position of the voice coil through the skeleton to make the voice coil symmetrical up and down in the magnetic field; however, the skeleton is prone to deformation and the bonding is complex.

[0005] Second: Reduce the number of turns of the coil on the upper part of the voice coil in the magnetic field as much as possible to minimize the asymmetry of BLX. For example, there are 2 layers of voice coils above the voice coil and 4 layers of voice coils below; however, it is still asymmetrical. Summary of the Utility Model

[0006] The purpose of the utility model is to overcome the deficiencies of the above traditional technologies and provide a loudspeaker.

[0007] The purpose of the utility model is achieved by the following technical measures: A loudspeaker, including a chassis, one side of the chassis is provided with a diaphragm, a dome is arranged on the side of the diaphragm facing the chassis, a voice coil is arranged inside the dome, and a centering washer and a magnetic circuit are arranged on the other side of the chassis. It is characterized in that: it further includes an auxiliary film laminate, the auxiliary film laminate is located between the chassis and the centering washer, one end of the auxiliary film laminate is fixed to the chassis, and the other end of the auxiliary film laminate is fixed to the voice coil.

[0008] The present invention also discloses a loudspeaker, including a chassis, one side of the chassis is provided with a diaphragm, a dome is arranged on the side of the diaphragm facing the chassis, a voice coil is arranged inside the dome, and a centering washer and a magnetic circuit are arranged on the other side of the chassis. It is characterized in that: it further includes an auxiliary film laminate, the auxiliary film laminate is located between the magnetic circuit and the centering washer, and both ends of the auxiliary film laminate are fixed to the centering washer.

[0009] As an improvement, the auxiliary film laminate includes an arc-shaped auxiliary film surround, and auxiliary film fixing parts horizontally extend from both ends of the auxiliary film surround.

[0010] As a further improvement, the arc of the auxiliary film surround is on the same side as the voice coil.

[0011] As a further improvement, the arc of the auxiliary film surround is not on the same side as the voice coil.

[0012] As a further improvement, the auxiliary film laminate includes a first electrode layer, a piezoelectric thin film layer adjacent to the first electrode layer, and a second electrode layer adjacent to the other side of the piezoelectric thin film layer.

[0013] As a further improvement, the piezoelectric thin film layer is a PVDF piezoelectric thin film layer.

[0014] As a further improvement, leads are respectively led out from the first electrode layer and the second electrode layer.

[0015] As a further improvement, the leads are wire materials or FPCs.

[0016] Due to the adoption of the above technical solutions, compared with the prior art, the advantages of the present utility model are:

[0017] Because of the setting of the auxiliary film laminate in the present novel, the auxiliary film laminate selects piezoelectric thin films such as PVDF. According to the inverse piezoelectric effect of the piezoelectric material, during the operation of the speaker, by supplying power to the piezoelectric thin film, internal stress is generated in the piezoelectric thin film, thereby providing an additional force for the vibration system of the speaker. By adjusting the direction and magnitude of the applied voltage, the driving forces for the diaphragm to vibrate downward and upward are made close to the same, improving the BLX symmetry of the speaker.

[0018] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Att Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;

[0020] Att Figure 2 is an exploded structural view of Embodiment 1 of the present utility model;

[0021] Att Figure 3 is a cross-sectional view of Embodiment 1 of the present utility model;

[0022] Att Figure 4 is a schematic diagram of the contraction force when the auxiliary film laminate of Embodiment 1 of the present utility model vibrates upward;

[0023] Att Figure 5 is a schematic diagram when the auxiliary film laminate of Embodiment of the present utility model does not conduct electricity when vibrating downward;

[0024] Att Figure 6 is a cross-sectional view of Embodiment 2 of the present utility model;

[0025] Att Figure 7 is a schematic diagram of the contraction force when the auxiliary film laminate of Embodiment 2 of the present utility model vibrates upward;

[0026] Appendix Figure 8 is a schematic diagram when the auxiliary film laminate described in the second aspect of the present utility model vibrates downward and is not powered on.

[0027] Appendix Figure 9 is a schematic structural diagram of the auxiliary film laminate described in the present utility model. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present utility model.

[0030] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise clearly and specifically defined.

[0032] Embodiment 1: As shown in Appendix Figure 1 - Appendix Figure 5 and Appendix Figure 9As shown in the figure, a loudspeaker includes a chassis 1. On one side of the chassis 1, there is a diaphragm 2. On the side of the diaphragm 2 facing the chassis 1, there is a dome 3. Inside the dome 3, there is a voice coil 4. On the other side of the chassis 1, there are a centering washer 5 and a magnetic circuit 6. It also includes an auxiliary film stack 7. The auxiliary film stack 7 is located between the chassis 1 and the centering washer 5. The auxiliary film stack 7 includes an arc-shaped auxiliary film surround 71, and horizontally extending auxiliary film fixing parts 72 at both ends of the auxiliary film surround 71. The auxiliary film fixing part 72 at one end of the auxiliary film stack 7 is fixed to the chassis 1, and the auxiliary film fixing part 72 at the other end of the auxiliary film stack 7 is fixed to the voice coil 4. And the length of the auxiliary film surround 71 cannot be greater than the width of the voice coil 4.

[0033] The arc of the auxiliary film surround 71 is on the same side as the voice coil 4.

[0034] The auxiliary film stack 7 includes a first electrode layer 73, a piezoelectric thin film layer 74 adjacent to the first electrode layer 73, and a second electrode layer 75 adjacent to the other side of the piezoelectric thin film layer 74. The piezoelectric thin film layer 74 is a PVDF piezoelectric thin film layer 74. The first electrode layer 73 and the second electrode layer 75 respectively lead out wires 75, and the wire 76 is a wire or an FPC.

[0035] The first electrode layer 73 is connected to positive electricity, and the second electrode layer 75 is connected to negative electricity.

[0036] When the loudspeaker vibrates upward, positive electricity is input to the first electrode layer 73, and negative electricity is input to the second electrode layer 75. A contraction force is generated at the auxiliary film surround 71 (based on the piezoelectric effect principle of piezoelectric materials, not elaborated here). This contraction force will generate a horizontal component force and a longitudinal upward component force. Since the auxiliary film fixing part 72 is fixed to the chassis 1 and the voice coil 4, only the longitudinal direction is in a free state. Therefore, this contraction force acts on the voice coil 4 to generate an upward thrust, which becomes the second driving force for the upward movement of the voice coil 4; the first driving force is the upward Lorentz force generated by the voice coil 4 itself. By adjusting the magnitude of the voltage applied to the auxiliary film stack 7, the driving forces for the upward and downward vibrations of the voice coil 4 are made close to the same, and the BLX symmetry of the loudspeaker is good.

[0037] When the loudspeaker vibrates downward, the auxiliary film stack 7 is not energized, and the auxiliary film stack 7 does not provide driving force or resistance to the voice coil 4. The driving force is only the Lorentz force generated by the voice coil 4 itself. In this way, the product sensitivity is not affected while ensuring the BLX symmetry.

[0038] Embodiment 2: As shown in the attached Figure 6 - attached Figure 9As shown in the figure, a loudspeaker includes a chassis 1. A diaphragm 2 is provided on one side of the chassis 1. A dome 3 is provided on the side of the diaphragm 2 facing the chassis 1. A voice coil 4 is provided inside the dome 3. A centering washer 5 and a magnetic circuit 6 are provided on the other side of the chassis 1. It further includes an auxiliary film stack 7. The auxiliary film stack 7 is located between the magnetic circuit 6 and the centering washer 5. Auxiliary film fixing parts 72 at both ends of the auxiliary film stack 7 are fixed on the centering washer 5.

[0039] The arc of the auxiliary film surround 71 is not on the same side as the voice coil 4.

[0040] Other structures are the same as those in the first embodiment except for the above.

[0041] When the loudspeaker vibrates upward, a positive charge is input to the first electrode layer 73 and a negative charge is input to the second electrode layer 75. At this time, the auxiliary film stack 7 generates tension, and also provides an upward second driving force to the voice coil 4. When the loudspeaker vibrates downward, the auxiliary film stack 7 is not energized, which will not be elaborated here.

[0042] When the loudspeaker is powered on and working, since the upper and lower lengths of the voice coil 4 of the loudspeaker in the magnetic field are inconsistent, and the vibration system is affected by its own weight, the driving force when the loudspeaker vibrates upward is smaller than that when it vibrates downward, and the BLX symmetry is poor. According to the inverse piezoelectric effect of the piezoelectric material, a voltage can be applied to the piezoelectric film layer 74, and the deformation of the piezoelectric film layer 74 can be controlled by adjusting the magnitude of the voltage and the direction of the current, so that the vibration system of the loudspeaker receives an additional force, making the driving forces of the piezoelectric film layer 74 vibrating upward and downward close to the same, and improving the BLX symmetry of the loudspeaker.

[0043] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A loudspeaker, comprising a chassis, a diaphragm is provided on one side of the chassis, a dome is provided on the side of the diaphragm facing the chassis, a voice coil is provided inside the dome, and a centering washer and a magnetic circuit are provided on the other side of the chassis, characterized in that: It further includes an auxiliary film laminate, which is located between the chassis and the centering washer. One end of the auxiliary film laminate is fixed to the chassis, and the other end is fixed to the voice coil.

2. A loudspeaker, comprising a chassis, a diaphragm is provided on one side of the chassis, a dome is provided on the side of the diaphragm facing the chassis, a voice coil is provided inside the dome, and a centering washer and a magnetic circuit are provided on the other side of the chassis, characterized in that: It further includes an auxiliary film laminate, which is located between the magnetic circuit and the centering washer. Both ends of the auxiliary film laminate are fixed to the centering washer.

3. A loudspeaker according to claim 1 or 2, characterized in that: The auxiliary film laminate includes an arc-shaped auxiliary film surround, and auxiliary film fixing parts horizontally extending from both ends of the auxiliary film surround.

4. The loudspeaker according to claim 3, characterized in that: The arc of the auxiliary film surround is on the same side as the voice coil.

5. A loudspeaker according to claim 3, characterized in that: The arc of the auxiliary film surround is not on the same side as the voice coil.

6. A loudspeaker according to claim 4 or 5, characterized in that: The auxiliary film laminate includes a first electrode layer, a piezoelectric thin film layer adjacent to the first electrode layer, and a second electrode layer adjacent to the other side of the piezoelectric thin film layer.

7. A loudspeaker according to claim 6, characterized in that: The piezoelectric thin film layer is a PVDF piezoelectric thin film layer.

8. A loudspeaker according to claim 7, characterized in that: The first electrode layer and the second electrode layer respectively lead out wires.

9. A loudspeaker according to claim 8, characterized in that: The wires are wire materials or FPCs.

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