CN107124683B

CN107124683B - Speaker monomer and electronic equipment

Info

Publication number: CN107124683B
Application number: CN201710374472.7A
Authority: CN
Inventors: 王海荣; 徐同雁
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2017-05-24
Filing date: 2017-05-24
Publication date: 2020-07-24
Anticipated expiration: 2037-05-24
Also published as: CN107124683A

Abstract

The invention discloses a speaker monomer and an electronic device, the speaker monomer comprises a vibration component (200), a static component (100) and an amplitude detection sensor (300), the amplitude detection sensor (300) comprises a piezoelectric film (310), a first end of the piezoelectric film (310) is connected with the vibration component (200), a second end of the piezoelectric film (300) is connected with the static component (100), the piezoelectric film (310) is bent between the first end and the second end, and the amplitude detection sensor (300) is arranged to generate an electric signal representing the amplitude of the vibration component (200) based on the deformation of the piezoelectric film (310).

Description

Speaker monomer and electronic equipment

Technical Field

The invention relates to the technical field of electroacoustic products, in particular to a loudspeaker single body and electronic equipment with the loudspeaker single body.

Background

The speaker unit is a basic structure of the speaker. The speaker monomer is including static subassembly and vibration subassembly, and static subassembly further includes shell, protecgulum and magnetic circuit subassembly, and magnetic circuit subassembly and vibration unit mount are on the shell, and the vibration subassembly includes vibrating diaphragm and voice coil loudspeaker voice coil, voice coil loudspeaker voice coil and vibrating diaphragm fixed connection, and the voice coil loudspeaker voice coil is set up in the magnetic gap that magnetic circuit subassembly formed to make the voice coil loudspeaker voice coil when receiving alternating current signal, can vibrate under magnetic circuit subassembly's effect, and then drive the vibrating diaphragm vibration and the air sound production around the policy.

When the loudspeaker single body works, when the amplitude of the vibration component is overlarge due to sudden increase of power, the risk of rubbing the vibration component and the static component of the loudspeaker single body can occur, for example, rubbing of a voice coil and a magnetic circuit component, rubbing of a vibrating diaphragm and a shell and the like occur, the occurrence of the rubbing phenomena can cause the improvement of distortion, the hearing sense and the tone quality of the loudspeaker are influenced, and meanwhile, the reliability and the yield of products are difficult to ensure; in addition, the sudden increase of power may affect the service life of the speaker, and thus the speaker may not continuously ensure high quality sound quality and listening feeling for a long time, and therefore, it is very necessary to monitor the amplitude of the vibration component of the speaker unit.

Disclosure of Invention

An object of the present invention is to provide a new technical solution of a speaker unit so that the speaker unit can output an electric signal representing the magnitude of the amplitude of a vibration component.

According to a first aspect of the present invention, there is provided a speaker unit comprising a vibrating member, a stationary member, and an amplitude detection sensor, the amplitude detection sensor comprising a piezoelectric film, a first end of the piezoelectric film being connected to the vibrating member, a second end of the piezoelectric film being connected to the stationary member, the piezoelectric film being bent between the first end and the second end, the amplitude detection sensor being configured to generate an electrical signal representing a magnitude of an amplitude of the vibrating member based on a deformation of the piezoelectric film.

Optionally, the amplitude detection sensor further includes two metal layer electrodes, the piezoelectric film is connected between the two metal layer electrodes, and the amplitude detection sensor is configured to output the electrical signal through the two metal layer electrodes.

Optionally, the vibration assembly includes a vibrating diaphragm, and the first end of the piezoelectric film is connected to the vibrating diaphragm; or, the vibration component comprises a vibrating diaphragm and a reinforcing part fixedly connected with the vibrating diaphragm, and the first end of the piezoelectric film is connected with the reinforcing part.

Optionally, the stationary assembly comprises a magnetic circuit assembly, and the second end of the piezoelectric film is connected to the magnetic circuit assembly.

Optionally, the stationary assembly comprises a front cover and a housing, the front cover having a sound outlet; the vibration component comprises a vibration diaphragm which is clamped between the front cover and the shell; the second end of the piezoelectric film is connected with the front cover.

Optionally, the vibration assembly comprises a diaphragm and a voice coil connected to the diaphragm, the stationary assembly comprises a magnetic circuit assembly, and the voice coil is disposed in a magnetic gap of the magnetic circuit assembly; the first end of the piezoelectric film is connected with the voice coil, and the second end of the piezoelectric film is connected with the magnetic circuit component.

Optionally, the speaker unit includes at least two of the amplitude detection sensors.

Optionally, the bent shape is a spiral shape or an S shape.

Optionally, the piezoelectric film is a polyvinylidene fluoride film, a polyvinylidene fluoride copolymer film or a polyvinylidene fluoride composite film.

According to a second aspect of the present invention, there is also provided an electronic device including the speaker cell according to the first aspect of the present invention.

The loudspeaker unit has the beneficial effects that the loudspeaker unit is provided with the amplitude detection sensor, the amplitude detection sensor is provided with the piezoelectric film capable of generating the piezoelectric effect, and the piezoelectric film is connected between the static component and the vibration component of the loudspeaker unit, so that the vibration component applies compression or stretching action to the piezoelectric film when vibrating, and further deforms the piezoelectric film, therefore, the amplitude detection sensor can generate an electric signal representing the amplitude based on the deformation of the piezoelectric film or the piezoelectric effect, and the aim of converting the amplitude change into the electric signal change is fulfilled. Based on the speaker monomer of this kind of structure, can adjust the input signal of vibration subassembly according to the signal of telecommunication to avoid the free vibration subassembly of speaker to take place to wipe with static subassembly and bump, thereby make the speaker monomer can last tone quality and the listening that guarantees the high-quality for a long time.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of an external structure of a speaker unit according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the speaker cell of FIG. 1;

fig. 3 is an exploded view of the speaker unit shown in fig. 1 and 2;

fig. 4 is a schematic cross-sectional view of another embodiment of a speaker cell according to the present invention;

fig. 5 is a schematic cross-sectional view of a third embodiment of a loudspeaker cell in accordance with the invention;

figure 6 is a schematic cross-sectional view of a fourth embodiment of a loudspeaker cell in accordance with the invention;

fig. 7 is a schematic structural diagram of an embodiment of an amplitude detection sensor.

Description of reference numerals:

100-a stationary component; 110-a front cover;

120-a housing; 130-a magnetic circuit assembly;

131-a central magnet; 132-a magnetic yoke;

133-central magnetically permeable plate; 200-a vibrating assembly;

210-a diaphragm; 220-a reinforcement;

230-a voice coil; 300-amplitude detection sensor;

310-a piezoelectric film; 320-metal layer electrode.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1 to 3 are schematic structural views of an embodiment of a speaker unit according to the present invention.

As shown in fig. 1 to 3, in this embodiment, the speaker unit includes a stationary member 100, a vibration member 200, and an amplitude detection sensor 300.

The amplitude detection sensor 300 includes a piezoelectric film having a first end connected to the vibration member 200 and a second end connected to the stationary member 100. The amplitude detection sensor 300 is configured to generate an electric signal indicating the magnitude of the amplitude of the vibration member 200 based on the deformation of the piezoelectric film.

The piezoelectric film may be a film having Polyvinylidene Fluoride (PVDF) material, and the film may be, for example, a Polyvinylidene Fluoride film, a Polyvinylidene Fluoride copolymer film, or a Polyvinylidene Fluoride composite film.

Further, the polyvinylidene fluoride composite film may be, for example, a composite film of polyvinylidene fluoride and lead zirconate titanate (PZT), which is generally referred to as a PVDF/PZT composite film, a composite film of polyvinylidene fluoride and lead magnesium niobate (PMT), which is generally referred to as a PVDF/PMT composite film, a composite film of polyvinylidene fluoride and Barium Titanate (BT), which is generally referred to as a PVDF/BT composite film.

Because polyvinylidene fluoride has the characteristic of good flexibility, the film made of the polyvinylidene fluoride material is beneficial to easily forming the piezoelectric film into a required shape.

Because polyvinylidene fluoride has the characteristic of low density, the film made of the polyvinylidene fluoride material is favorable for controlling the quality of the vibration component.

Because polyvinylidene fluoride has the characteristic of low impedance, the film with the polyvinylidene fluoride material is favorable for improving the sensitivity of the loudspeaker monomer.

The piezoelectric film can be bent in a spiral shape or an S shape between the first end and the second end of the piezoelectric film, so that the piezoelectric film can be greatly deformed in the vibration direction of the vibration assembly, and the amplitude detection sensor 300 cannot be influenced by the large deformation to reach the preset maximum amplitude. The amplitude detection sensor 300 may further include two electrical connections (not shown in the drawings). The two electrical connections are provided for making electrical connection between the amplitude detection sensor 300 and an external circuit to output an electrical signal generated by the amplitude detection sensor 300.

The two electrical connections may be soldered to corresponding pads on the speaker cell.

In the embodiment shown in fig. 7, the amplitude detection sensor 300 may further include two metal layer electrodes 320 in addition to the piezoelectric film 310, and the piezoelectric film 310 is connected between the two metal layer electrodes 320. The structure is beneficial to the sufficient polarization of the piezoelectric film and the leading-out of the electric signal, and the strength of the electric signal is further improved.

The two metal layer electrodes 320 may be directly coated on the surface of the piezoelectric film 310 by vacuum evaporation, vacuum magnetron sputtering, screen printing, or the like.

With the amplitude detection sensor 300 adopting the configuration shown in fig. 7, the above two electrical connection portions may each be connected to one metal layer electrode 300.

The above two electrical connection portions may be integrally formed with the metal layer electrodes 300 connected correspondingly.

In another embodiment, the amplitude detection sensor 300 may further include a piezoelectric film connection portion extending through the piezoelectric film in addition to the piezoelectric film 310, and the two electrical connection portions may be respectively connected to two opposite surfaces of the piezoelectric film connection portion.

The piezoelectric film connecting portion may be integrally formed with the piezoelectric film.

The two electrical connection portions can be directly coated on the corresponding surfaces of the piezoelectric film connection portion by means of vacuum evaporation, vacuum magnetron sputtering, screen printing and the like.

In the present embodiment, the stationary assembly 100 includes a front cover 110, a housing 120, and a magnetic circuit assembly 130.

In the present embodiment, the vibration assembly 200 includes a diaphragm 210, a reinforcement part 220 (also referred to as DOME) fixedly connected to the diaphragm 210, and a voice coil 230 fixedly connected to the diaphragm 210.

The diaphragm 210 is interposed between the front cover 110 and the housing 120 to divide a space enclosed by the front cover 110 and the housing 120 into a front acoustic cavity located at one side of the front cover 110 and a rear acoustic cavity located at one side of the housing 120.

The magnetic circuit assembly 130 and the voice coil 230 are both located in the rear acoustic cavity, and the voice coil 230 is placed in the magnetic gap of the magnetic circuit assembly 130.

The reinforcing part 220 is fixedly attached to the surface of the diaphragm 210 at the front acoustic chamber side.

The sound outlet of the speaker unit is communicated with the front sound chamber, and the sound outlet is disposed on the front cover 110.

In the present embodiment, the first end of the piezoelectric film of the amplitude detection sensor 300 is connected to the reinforcing portion 220, and the second end is connected to the front cover 110.

In this embodiment, when the vibration component 200 vibrates, a compression action or a tension action of different degrees is applied to the piezoelectric film along the vibration direction, the action causes the piezoelectric film to deform to different degrees, and the deformation increases with the increase of the amplitude of the vibration component 200, so that the amplitude detection sensor 300 can generate an electric signal representing the amplitude.

Based on the speaker unit with such a structure, when the amplitude detection sensor 300 is connected to an external circuit, the amplitude of the vibration component 200 can be monitored by the external circuit, and the input signal of the vibration component 200 can be further adjusted when the amplitude exceeds a set threshold, so as to avoid the parts (including the voice coil, the diaphragm, and the like) of the vibration component 200 from rubbing against the stationary component 100 of the speaker unit.

In embodiments where the vibration assembly 200 does not include the reinforcement portion 220, the first end of the piezoelectric film may also be connected to the diaphragm 210.

Fig. 4 is a schematic cross-sectional view of another embodiment of a speaker cell according to the present invention.

According to fig. 4, the differences between the speaker unit in this embodiment and the embodiment shown in fig. 2 include: the speaker unit includes two amplitude detection sensors 300.

Two amplitude detection sensors 300 are connected at different positions of the vibration assembly 200 to detect the amplitude levels of the vibration assembly at the different positions.

Such a structure would provide advantageous support for studying the polarization of the vibration assembly 200.

In further embodiments, the speaker unit also includes more than two amplitude detection sensors 300.

Each amplitude detection sensor 300 corresponds to two pads, and the pads may be directly plated on the housing 120 of the speaker unit or may be provided on an FPCB (flexible circuit board) in the case where the speaker unit has the FPCB.

Fig. 5 is a schematic cross-sectional view of a third embodiment of a loudspeaker cell according to the invention.

According to fig. 3, the differences between the speaker unit in this embodiment and the embodiment shown in fig. 4 include: the first end of the piezoelectric film of the amplitude detection sensor 300 is connected to the diaphragm 210, and the second end is connected to the magnetic circuit assembly 130.

Referring to fig. 2 and 5, the magnetic circuit assembly 130 includes a magnetic yoke 132, a central magnet 131, and a central magnetic plate 133.

Yoke 132 is a bowl-shaped yoke, and has a flat plate portion and a side wall portion bent and extended toward the side of voice coil 230 via an edge of the flat plate portion. The center magnet 131 is fixedly attached to the surface of the flat plate portion facing the voice coil 230 by, for example, adhesion so as to form a magnetic gap between the side wall portion and the center magnet 131.

In another embodiment, the magnetic conductive yoke 132 may be a flat plate. In this embodiment, the magnetic circuit assembly may form a magnetic gap by disposing side magnets on the magnetic conductive yoke 132 around the center magnet 131.

The central magnetic conductive plate 133 is disposed on a surface of the central magnet 131 facing the diaphragm 210 to play a role of correcting magnetic lines of force.

In this embodiment, the second end of the piezoelectric film may be connected to the central magnetically permeable plate 133.

In embodiments where the central magnetically permeable plate 133 is not provided, the second end of the piezoelectric film may also be coupled to the central magnet 131.

In other embodiments where a piezoelectric film is connected between the diaphragm 210 and the magnetic circuit assembly 130, the speaker unit may also include one amplitude detection sensor 300, or more than two amplitude detection sensors 300.

Fig. 6 is a schematic cross-sectional view of a fourth embodiment of a loudspeaker cell in accordance with the invention.

According to fig. 6, the differences between the speaker unit in this embodiment and the embodiment shown in fig. 4 include: the first end of the piezoelectric film of the amplitude detection sensor 300 is connected to the voice coil 230, and the second end is connected to the magnetic yoke 132 of the magnetic circuit assembly 130. This means that the amplitude detection sensor 300 is located in the magnetic gap.

In the embodiment shown in fig. 6, the speaker unit may include two amplitude detection sensors 300.

In the embodiment shown in fig. 6, the speaker unit may also include more than two amplitude detection sensors 300.

In the embodiment shown in fig. 6, the speaker unit may also include an amplitude detection sensor 300.

Further, the one amplitude detection sensor 300 may be formed spirally around the central magnet 131.

In another embodiment of the present invention, the speaker unit may be provided with more than two (including two) amplitude detection sensors 300, and at least two of the amplitude detection sensors 300 may have different connection structures.

The above embodiments mainly focus on differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A speaker cell comprising a vibrating assembly (200), a stationary assembly (100), and an amplitude detection sensor (300), wherein the amplitude detection sensor (300) comprises a piezoelectric film (310), a first end of the piezoelectric film (310) is connected to the vibrating assembly (200), a second end of the piezoelectric film (300) is connected to the stationary assembly (100), the piezoelectric film (310) is bent between the first end and the second end, and the amplitude detection sensor (300) is configured to generate an electrical signal representing an amplitude magnitude of the vibrating assembly (200) based on a deformation of the piezoelectric film (310), and wherein the stationary assembly comprises any one or more of a housing, a front cover, and a magnetic circuit assembly.

2. The speaker cell according to claim 1, wherein the amplitude detection sensor (300) further comprises two metal layer electrodes (320), the piezoelectric film (310) being connected between the two metal layer electrodes (320), the amplitude detection sensor (300) being arranged to output the electrical signal through the two metal layer electrodes (320).

3. The speaker cell as claimed in claim 1, wherein the vibration assembly (200) comprises a diaphragm (210), and the first end of the piezoelectric film (310) is connected to the diaphragm (210); or, the vibration component (200) comprises a diaphragm (210) and a reinforcing part (220) fixedly connected with the diaphragm (210), and the first end of the piezoelectric film (310) is connected with the reinforcing part (220).

4. The speaker cell as claimed in claim 1, wherein the stationary assembly (100) comprises a magnetic circuit assembly (130), the second end of the piezoelectric film (310) being connected to the magnetic circuit assembly (130).

5. The speaker cell of claim 1, wherein the stationary assembly (100) comprises a front cover (110) and a housing (120), the front cover (110) having a sound outlet aperture; the vibration component (200) comprises a vibrating diaphragm (210), and the vibrating diaphragm (210) is clamped between the front cover (110) and the shell (120); the second end of the piezoelectric film (310) is connected to the front cover (110).

6. The speaker cell as claimed in claim 1, wherein the vibration assembly (200) comprises a diaphragm (210) and a voice coil (230) connected to the diaphragm (210), the stationary assembly (100) comprises a magnetic circuit assembly (130), and the voice coil (230) is disposed in a magnetic gap of the magnetic circuit assembly (130); the first end of the piezoelectric film (310) is connected with the voice coil (230), and the second end of the piezoelectric film (310) is connected with the magnetic circuit component (130).

7. The speaker cell of claim 1, comprising at least two of the amplitude detection sensors (300).

8. The speaker cell as claimed in claim 1, wherein the bend is in the shape of a spiral or S.

9. The loudspeaker unit according to any of claims 1 to 8, wherein the piezoelectric film (310) is a polyvinylidene fluoride film, a polyvinylidene fluoride copolymer film or a polyvinylidene fluoride composite film.

10. An electronic device, characterized by comprising the speaker cell of any one of claims 1 to 9.