CN204652640U - A kind of electro-acoustic conversion device - Google Patents

Abstract

The utility model discloses an electroacoustic conversion device, comprising: a vibration system and a magnetic circuit system with a magnetic gap; the vibration system includes: a diaphragm, a voice coil combined under the diaphragm and suspended in the magnetic gap, a The piezoelectric sheet on one side of the diaphragm, the first frequency division circuit connected to the voice coil, and the second frequency division circuit connected to the piezoelectric sheet; the first frequency division circuit divides the frequency of the first audio signal input from the outside The low-frequency signal is output to the voice coil; the second frequency-dividing circuit divides the externally input second audio signal into a high-frequency signal to drive the piezoelectric film. The utility model has a moving-coil sounding structure and a piezoelectric sounding structure at the same time, and is provided with two frequency division circuits. When the piezoelectric sheet has a high-frequency signal input, it drives the diaphragm to vibrate and make sound, and when the voice coil has a low-frequency signal, it is input Under the action of the magnetic field, the vibrating membrane is driven to vibrate and produce sound, thereby realizing an electro-acoustic conversion device with good performance and ultra-wide frequency band.

Description

An electroacoustic conversion device

technical field

The utility model relates to an electroacoustic conversion device.

Background technique

Ordinary dynamic receivers and speakers are collectively referred to as dynamic electroacoustic conversion devices. Whether it is applied to mobile phones or earphones, the high-frequency frequency response curve of the receiver will drop rapidly at 6k-9kHz, and the high-frequency frequency response curve of the speaker will also drop rapidly after more than ten KHz. high-frequency cut-off frequency. Due to the limitations of the material and process of the dynamic electro-acoustic conversion device, it is difficult to increase the high-frequency cut-off frequency.

With the application of 4G communication, electro-acoustic conversion devices requiring ultra-wideband (super wideband) require high-frequency cut-off frequencies to reach 16kHz and above, but the existing dynamic electro-acoustic conversion devices have been difficult to meet the requirements .

Utility model content

The purpose of the utility model is to provide a new technical scheme of an ultra-wideband electroacoustic replacement device.

The utility model provides an electroacoustic conversion device, which includes: a vibration system and a magnetic circuit system with a magnetic gap; the vibration system includes: a diaphragm, which is combined under the diaphragm and suspended in the magnetic gap The voice coil, the piezoelectric sheet combined with one side of the diaphragm, the first frequency dividing circuit connected with the voice coil, and the second frequency dividing circuit connected with the piezoelectric sheet; the first dividing The frequency circuit divides the first audio signal input from the outside to obtain a low-frequency signal and outputs it to the voice coil; the second frequency division circuit divides the second audio signal input from the outside into a high-frequency signal to drive the voltage film.

Preferably, the first frequency division circuit is a low-pass filter, and the second frequency division circuit is a high-pass filter.

Preferably, the vibrating membrane includes a planar portion at the center and a ring portion at an edge of the planar portion, and the piezoelectric sheet is arranged at the planar portion of the vibrating membrane.

Preferably, the vibration system further includes a damper fixed to the voice coil, the damper includes a first conductive line and a second conductive line formed on its surface, and the first audio frequency input from the outside The signal is input to the first frequency division circuit through the first conductive line, and the second audio signal input from the outside is input to the second frequency division circuit through the second conductive line.

Preferably, the first frequency dividing circuit and the second frequency dividing circuit are arranged on the surface of the damper.

Preferably, the first frequency dividing circuit is arranged on the surface of the damper, and the second frequency dividing circuit is arranged on the surface of the piezoelectric sheet.

Preferably, the arrangement of the vibration system is any of the following: from top to bottom, the piezoelectric film, the strut, the diaphragm, and the voice coil; or, from the top to the bottom, the diaphragm, the piezoelectric film , the centering strut, the voice coil; or, from top to bottom, the piezoelectric film, the diaphragm, the centering strut, and the voice coil.

Preferably, the damper is provided with two second pads electrically connected to the piezoelectric sheet on its upper surface and two first pads electrically connected to the voice coil on its lower surface. plate.

Preferably, the center of the diaphragm is provided with an opening, the damper includes a central part, an outer ring, and a connection part connecting the central part and the outer ring, and the first pad and the second pad Set at the center of the damper.

The inventor of the present utility model found that there is no ultra-wideband electroacoustic conversion device combined with a moving coil sounding structure in the prior art. Therefore, the technical tasks to be achieved or the technical problems to be solved by the utility model are never thought of or expected by those skilled in the art, so the utility model is a new technical solution.

The electro-acoustic conversion device of the utility model has both a moving-coil sounding structure and a piezoelectric sounding structure, and is provided with two frequency division circuits. When a low-frequency signal is input, the diaphragm is driven to vibrate and produce sound under the action of a magnetic field, thereby realizing an electro-acoustic conversion device with good performance in an ultra-wide frequency band.

Other features and advantages of the present invention will become clear through the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of 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 principle of the invention.

Fig. 1 is a structural schematic diagram of the electro-acoustic conversion device of the present invention.

Fig. 2 is a schematic structural view of the damper of the present invention.

Fig. 3 is a structural diagram of the utility model in which the first conductive circuit and the first frequency division circuit are arranged on the lower surface of the damper.

Fig. 4 is a structural schematic diagram of the utility model in which a second conductive circuit and a second frequency division circuit are arranged on the upper surface of the damper.

Fig. 5 is a schematic diagram of the structure of the second frequency dividing circuit arranged on the piezoelectric sheet of the present invention.

Explanation of reference signs

1 front cover, 2 piezoelectric film, 3 centering support film, 4 diaphragm, 5 voice coil, 6 frame and magnetic circuit system, 301 outer ring, 302 central part, 303 cantilever, 100 low-pass filter, 200 high-pass Filter, pad 31, pad 33, pad 32 first, pad 34 second.

Detailed ways

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 arrangements of components and steps, 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 in no way serves as any limitation of the invention and its application or use.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The electro-acoustic conversion device of the utility model includes a vibration system, a magnetic circuit system, and a housing for accommodating the fixed vibration system and the magnetic circuit system. The magnetic circuit system includes washers, magnets, basin frames, etc. that are fixed sequentially from top to bottom. The magnets can include center magnets and side magnets. Correspondingly, washers can include center washers and side washers, and center magnets and side magnets. The gap between the magnets is the magnetic gap. Of course, the structure of the magnetic circuit system and the setting of the magnetic gap can also be implemented in other ways, and those skilled in the art can design according to the needs of the existing technology and the application environment. The vibration system includes a vibrating membrane, a voice coil combined under the vibrating membrane and suspended in the magnetic gap, and a piezoelectric sheet combined on one side of the vibrating membrane.

It also includes the first frequency division circuit connected to the voice coil and the second frequency division circuit connected to the piezoelectric sheet. The purpose of the frequency division is to separate the high-frequency components and low-frequency components of the signal. The first audio signal is frequency-divided to generate a low-frequency signal and output to the voice coil, and the second frequency-dividing circuit divides the externally input second audio signal to obtain a high-frequency signal to drive the piezoelectric sheet. The source of the two audio signals is the same, but the power of the second audio signal will be relatively large after passing through the power amplifier circuit. Wherein, the first frequency dividing circuit may be, for example, a low-pass filter, and the second frequency dividing circuit may, for example, be a high-pass filter.

Through the above structure, the combination of the moving coil sound generating device and the piezoelectric sound generating device is realized. The high-frequency cut-off frequency of the piezoelectric sounding device can reach 16kHz and above. By setting the above-mentioned frequency division circuit, the piezoelectric film drives the diaphragm to vibrate and produce sound when the high-frequency signal is input, and the voice coil is under the action of the magnetic field when the low-frequency signal is input. The diaphragm is driven to vibrate and produce sound, thereby realizing an ultra-wideband electro-acoustic conversion device.

In addition, the piezoelectric sheet is arranged at the center of the diaphragm, so that the piezoelectric sheet can function as a reinforcing part or DOME of the diaphragm. For example, the diaphragm may include a planar part at the center and a ring part at the edge of the planar part. The piezoelectric sheet is arranged at the position of the flat part of the diaphragm.

Referring to Figures 1-4, an embodiment of the electroacoustic conversion device of the present invention is shown, which includes, from top to bottom: front cover 1, piezoelectric sheet 2, centering support 3, diaphragm 4, voice coil 5, Frame and magnetic circuit system6.

The magnetic circuit system has a magnetic gap, and the front cover 1 and the frame form a housing for accommodating the fixed vibration system and the magnetic circuit system. The schematic integrated drawing of the magnetic circuit system and the frame body is shown in FIG. 1 .

The piezoelectric sheet 2, the centering support sheet 3, the diaphragm 4, and the voice coil 5 form a vibration system. As can be seen from Figure 1, the diaphragm includes a plane part at the center, a ring part at the edge of the plane part, and a fixed part fixed to the outermost shell; the piezoelectric sheet is arranged above the plane part of the diaphragm The flat part of the diaphragm is removed at the position corresponding to the piezoelectric sheet to form a through opening. The piezoelectric sheet covers the opening and is combined with the diaphragm. After this arrangement, the piezoelectric sheet can play the role of diaphragm reinforcement or DOME. effect. Figure 1 is an exploded schematic diagram. After assembly, the voice coil will be suspended in the magnetic gap of the magnetic circuit system.

2 shows a schematic structure of damper 3, damper 3 includes an outer ring 302 and a center portion 301 located at the center, and the center portion 301 and outer ring 302 are connected by four cantilevers 303 (connecting portions). connect them.

Referring to Fig. 3, it is shown the lower surface of the spider 3, the first conductive circuit (not shown in the figure), the first-order low-pass filter 100 made up of the inductance and the load resistance are arranged on the lower surface, and are positioned at the outer ring edge Two pads 31 at the corners, and two first pads 32 at the center. The first conductive line is electrically connected to the external circuit through the pad 31 to receive the first audio signal, and the low-frequency signal is filtered by a first-order low-pass filter, and the low-frequency signal is output to the voice coil 5 through the first pad 32 .

Referring to Fig. 4, it is shown as the upper surface of the centering piece 3, on the upper surface is provided with a second conductive line (not shown in the figure), a first-order high-pass filter 200 composed of a capacitor and a load resistance, located at the outer ring Two pads 33 at the two corners, and two second pads 34 at the center. The second conductive line is electrically connected to the external circuit through the pad 33 to access the second audio signal, and the high-frequency signal is filtered through a first-order high-pass filter, and the high-frequency signal is output to the piezoelectric sheet 2 through the second pad 34 .

In another embodiment, the second frequency dividing circuit can also be arranged on the piezoelectric sheet 2 . Referring to FIG. 5 , a first-order high-pass filter 200 composed of a capacitor and a load resistor is disposed on the piezoelectric film 2 . The second conductive line on the spider 3 is electrically connected to the external circuit through the pad 33 to access the second audio signal, and then the second audio signal is output to the first-order high-pass filter 200 through the pad 34 for filtering and extraction. A high-frequency signal drives the piezoelectric sheet to vibrate.

In the above embodiments, the vibration system is arranged in the following order from top to bottom: the piezoelectric film, the strut, the diaphragm, and the voice coil. Alternatively, the arrangement of the vibration system from top to bottom is the diaphragm, the piezoelectric film, the spider, and the voice coil. Alternatively, the arrangement of the vibration system is piezoelectric sheet, diaphragm, spider, and voice coil from top to bottom. In these several arrangements, the strut is located between the piezoelectric film and the voice coil, and the conductive line and the frequency division circuit can be set by using the strut, and since the center of the diaphragm is provided with an opening, it can be positioned at the fixed The upper surface of the central part of the core piece is provided with a second pad connected to the piezoelectric sheet, and the lower surface of the central part is provided with a first pad connected with the voice coil. This connection method is easy to realize without obstacles and short connection lines.

The electro-acoustic conversion device of the utility model has both a moving-coil sounding structure and a piezoelectric sounding structure, and is provided with two frequency division circuits. When a low-frequency signal is input, the diaphragm is driven to vibrate and produce sound under the action of a magnetic field, thereby realizing an electro-acoustic conversion device with good performance in an ultra-wide frequency band. Simultaneously, the utility model can utilize the centering strut to arrange the conductive circuit and the frequency division circuit, and the wiring is ingenious and easy to realize.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration rather than limiting the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (9)

1. an electro-acoustic conversion device, is characterized in that, comprising:

Vibrational system and the magnetic circuit system with magnetic gap;

Described vibrational system comprises: vibrating diaphragm (4), be incorporated into described vibrating diaphragm (4) below and be suspended in the voice coil loudspeaker voice coil (5) in described magnetic gap, the piezoelectric patches (2) being incorporated into described vibrating diaphragm (4) side, the first frequency dividing circuit be connected with described voice coil loudspeaker voice coil (5) and the second frequency dividing circuit be connected with described piezoelectric patches (2);

The first via audio signal that outside inputs by described first frequency dividing circuit divides the low frequency signal that occurs frequently to export described voice coil loudspeaker voice coil (5) to; The second tunnel audio signal that outside inputs by described second frequency dividing circuit divides the high-frequency signal that occurs frequently to drive described piezoelectric patches (2).

2. device according to claim 1, is characterized in that, described first frequency dividing circuit is low pass filter (100), and described second frequency dividing circuit is high pass filter (200).

3. device according to claim 1, it is characterized in that, described vibrating diaphragm (4) comprises the planar portions being positioned at center and the ring portion being positioned at described planar portions edge, and described piezoelectric patches (2) is arranged at the position of the planar portions of described vibrating diaphragm (4).

4. device according to claim 1, it is characterized in that, described vibrational system also comprises the centring disk (3) fixing with described voice coil loudspeaker voice coil (5), described centring disk (3) comprises the first conducting wire and the second conducting wire that are formed at its surface, the first via audio signal of outside input inputs to described first frequency dividing circuit through described first conducting wire, and the second tunnel audio signal of outside input inputs to described second frequency dividing circuit through described second conducting wire.

5. device according to claim 4, is characterized in that, described first frequency dividing circuit and described second frequency dividing circuit are arranged at the surface of described centring disk (3).

6. device according to claim 4, is characterized in that, described first frequency dividing circuit is arranged at the surface of described centring disk (3), and described second frequency dividing circuit is arranged at the surface of described piezoelectric patches (2).

7. the device according to any one of claim 4-6, it is characterized in that, the arrangement mode of described vibrational system is following arbitrary: be followed successively by piezoelectric patches (2), centring disk (3), vibrating diaphragm (4), voice coil loudspeaker voice coil (5) from top to bottom; Or, be followed successively by vibrating diaphragm (4), piezoelectric patches (2), centring disk (3), voice coil loudspeaker voice coil (5) from top to bottom; Or, be followed successively by piezoelectric patches (2), vibrating diaphragm (4), centring disk (3), voice coil loudspeaker voice coil (5) from top to bottom.

8. device according to claim 7, it is characterized in that, described centring disk (3) thereon surface is provided with two the second pads (34) be electrically connected with described piezoelectric patches (2) and is provided with two the first pads (32) be electrically connected with described voice coil loudspeaker voice coil (5) at its lower surface.

9. device according to claim 8, it is characterized in that, the center of described vibrating diaphragm (4) is provided with opening, described centring disk (3) comprises central part (301), outer shroud (303), and connecting the connecting portion (302) of described central part (301) and outer shroud (302), described first pad (32) and the second pad (34) are arranged at the central part of described centring disk.