CN214045996U

CN214045996U - Coaxial electret loudspeaker

Info

Publication number: CN214045996U
Application number: CN202023038682.5U
Authority: CN
Inventors: 王天来; 林金正; 丁振裕; 林柄宏; 翁祥然
Original assignee: Verisonix Technology Co ltd
Current assignee: Verisonix Technology Co ltd
Priority date: 2020-12-16
Filing date: 2020-12-16
Publication date: 2021-08-24
Anticipated expiration: 2030-12-16

Abstract

The utility model provides a coaxial electret loudspeaker, which comprises a first loudspeaker module, a first fixing frame, a second loudspeaker module and a second fixing frame. A first speaker module driven by an audio signal to generate a low frequency range sound; the first fixing frame is used for fixing the first loudspeaker module; a second speaker module driven by the audio signal to generate mid-high frequency range sound; and the second fixing frame is arranged between the first loudspeaker module and the second loudspeaker module and used for fixing the second loudspeaker module and enabling the second loudspeaker module and the first loudspeaker module to be positioned on the same axis, wherein the first fixing frame and the second fixing frame form a synchronous vibration cavity module.

Description

Coaxial electret loudspeaker

Technical Field

The utility model relates to a speaker module, especially a be applied to coaxial electret speaker on earphone.

Background

At present, for the earphone product to meet the requirement of Hi-Res high-resolution sound quality, except for improving the material of the diaphragm, two or more speaker units are generally responsible for outputting sounds in different frequency bands, and the existing earphone product is realized by adopting an arrangement mode, however, the parallel mode basically has two defects, namely a first defect: the plane area occupied by the whole set of speakers is too large, and the design of the appearance size of the earphone is affected. The second disadvantage is that: the loudspeakers are respectively placed at different positions, so that mutual interference of output sound pressure of the loudspeakers is easily caused, and the overall acoustic performance and distortion are influenced.

Since the Electret speaker (Electret loud speaker) itself has a medium and high pitch sound quality which is quite beautiful, clear and high-resolution, and is not comparable to the common moving coil speaker, the Electret speaker is very suitable for being applied to the common listening earphone. In addition, the electret speaker has excellent sound localization feeling, and even in the future, the electret speaker can be combined with an electret array (array) mode to provide more excellent sound localization, so that the electret speaker is also very suitable for being applied to a competitive earphone.

However, due to the structural limitation of the general electret speaker, the electret film (membrane) is not easy to generate the low-frequency vibration displacement of the large stroke, so that the electret speaker depends on the general moving coil speaker (moving coil loudspeaker) to supplement the low-frequency response part for some applications.

Therefore, it is an important issue in the industry to improve and provide a coaxial electret speaker to avoid the above problems.

SUMMERY OF THE UTILITY MODEL

In view of the above problems in the prior art, an object of the present invention is to provide a coaxial electret speaker to solve various problems in the prior art.

According to the utility model discloses an one of them purpose provides a coaxial electret speaker, includes first speaker module, first mount, second speaker module and second mount. A first speaker module driven by an audio signal to generate a low frequency range sound; the first fixing frame is used for fixing the first loudspeaker module; a second speaker module driven by the audio signal to generate mid-high frequency range sound; and the second fixing frame is arranged between the first loudspeaker module and the second loudspeaker module and used for fixing the second loudspeaker module and enabling the second loudspeaker module and the first loudspeaker module to be positioned on the same axis, wherein the first fixing frame and the second fixing frame form a synchronous vibration cavity module.

In some embodiments, the apparatus further includes a crossover driving module installed on the first and second fixing frames, electrically connected to the first and second speaker modules, respectively, and configured to generate an audio signal.

In some embodiments, the frequency division driving module is fixed on the first fixing frame and the second fixing frame through at least one screw.

In some embodiments, the first speaker module is a moving coil speaker and the second speaker module is an electret speaker.

In some embodiments, the second speaker module has an external shape of a rectangle, a circle, an ellipse, a triangle, other polygons, an irregularity, or an arbitrary shape.

In some embodiments, the second fixing frame has a concave portion corresponding to the external shape of the second speaker module to receive and fix the second speaker module.

In some embodiments, the speaker module further includes a dust screen coupled to the second fixing frame to fix the second speaker module, and the dust screen has a plurality of through holes on a surface thereof to serve as sound radiation outlets of the second speaker module.

In some embodiments, the second fixing frame has a sound outlet hole respectively formed above and below the second fixing frame to serve as a sound radiation outlet of the first speaker module.

To sum up, the utility model discloses a coaxial electret speaker can conclude and have following advantage:

(1) the high frequency in the electret has clear sound and distinct sound field positioning, and can easily meet the requirement of high resolution sound quality (Hi-Res).

(2) The coaxial design can reduce the occupied area of the electret and the moving coil loudspeaker and the interference on the phase between the electret and the moving coil loudspeaker. Low frequency and medium-high frequency are divided, which can improve the sound quality and has Low distortion (Low distortion).

(3) The product change elasticity can be increased, and the monomers with different characteristics can be replaced according to the requirements of customers.

(4) The modular design can reduce the cavity design and shorten the development time.

In order to make the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A is an exploded perspective view of a first embodiment of the present invention.

Fig. 1B is an exploded perspective view of the first embodiment of the present invention from another perspective.

Fig. 1C is a schematic perspective view of the first embodiment of the present invention.

Fig. 2A is an exploded perspective view of a second embodiment of the present invention.

Fig. 2B is an exploded perspective view of the second embodiment of the present invention from another perspective.

Fig. 2C is a schematic perspective view of a second embodiment of the present invention.

Fig. 3 is an exploded perspective view of a second speaker module according to an embodiment of the present invention.

Description of reference numerals: 10-a first speaker module; 20. 21-a second speaker module; 201-iron net; 202-a barrier layer; 203-electret film; 30-a first mount; 31-a carrier; 31 a-holes; 40-a second mount; 40 a-sound outlet; 41-a recess; 50-a frequency division driving module; 51. 53-round head screws; 52-grub screws; 60. 61-dust screen; 60 a-perforation; 70-axis; 100. 101-coaxial electret speaker.

Detailed Description

For purposes of clarity and convenience in the description, components in the drawings may be expanded or reduced in size and scale. In the following description and/or claims, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present; when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present, and other words used to describe the relationship between the elements or layers should be interpreted in the same manner. For ease of understanding, like elements in the following embodiments are illustrated with like reference numerals.

Referring to fig. 1A, fig. 1B and fig. 1C together, fig. 1A is an exploded perspective view of a first embodiment of the present invention, and fig. 1B is a schematic perspective view of the first embodiment of the present invention. The coaxial electret speaker 100 includes a first speaker module 10, a first fixing frame 30, a second speaker module 20, and a second fixing frame 40.

The first speaker module 10 is driven by an audio signal to generate a low frequency range sound. The first speaker module 10 has a circular external shape. Preferably, the first speaker module 10 is composed of a Voice-coil speaker (Voice-coil speaker).

The first fixing frame 30 is used for fixing the first speaker module 10. The first fixing frame 30 is generally composed of a circular body and a rectangular bearing portion 31. Holes are formed on both sides of the circular body to allow corresponding fasteners (e.g., flat head screws 52) to pass through, so that the first fixing frame 30 and the second fixing frame 40 can be combined and locked with each other. Holes 31a are formed on two sides of the supporting portion 31 for passing corresponding round head screws 51, so that the frequency division driving module 50 can be fixed on the first fixing frame 30. In addition, the round head screw 51 and the flat head screw 52 are used as an example of the fixing member of the present invention, and are not intended to be limiting.

The second speaker module 20 is driven by an audio signal to generate a middle-high frequency range sound. The second speaker module 20 has a rectangular external shape. Preferably, the second speaker module 20 is composed of an electret speaker. It should be noted that when the second speaker module 20 is driven by an audio signal, it can generate vibration to directly and finely generate fine sound. Specifically, the second speaker module 20 has a charge-nanopore polymer material layer: PTFE membranes, which are sensitive to any input power, produce small vibrations. The second speaker module 20 can reproduce original fine sound without a conventional high voltage amplifier.

The second fixing frame 40 is disposed between the first speaker module 10 and the second speaker module 20. The second fixing frame 40 is used for fixing the second speaker module 20, and making the second speaker module 20 and the first speaker module 10 located on the same axis 70. The second holder 40 has a recess 41 corresponding to the external shape of the second speaker module 20 to receive and hold the second speaker module 20.

The second fixing frame 40 has holes 41a at four corners of the rectangular frame and two sides of the circular body for corresponding fasteners (e.g., flat head screws 52) to pass through, so that the first fixing frame 30 and the second fixing frame 40 can be combined and locked with each other. As shown in fig. 1C, the combined first fixing frame 30 and the second fixing frame 40 form a synchronous vibration cavity module. The first holder 30 is a front cavity, and the second holder 40 is a rear cavity.

As shown in fig. 1A, the second fixing frame 40 has a sound outlet 40a structure. More specifically, the second fixing frame 40 has sound emitting holes 40a on left and right sides of the circular body, respectively, to serve as sound radiation outlets of the first speaker module 10.

It should be noted that, because the sound output of the first speaker module 10 and the sound output of the second speaker module 20 are located on the same axis 70, the radiation of the sound is most concentrated, there is no mutual interference, and the sound quality of the whole frequency response is relatively uniform.

The frequency division driving module 50 is installed on the first fixing frame 30 and the second fixing frame 40. The crossover driving module 50 is electrically connected to the first speaker module 10 and the second speaker module 20, respectively. The crossover driving module 50 is used to generate an audio signal. The audio signal comprises a low-frequency signal, an intermediate-frequency signal and/or a high-frequency signal.

As shown in fig. 1A, the frequency-division driving module 50 is fastened to the first fixing frame 30 and the second fixing frame 40 by screws 51. More specifically, the frequency-division driving module 50 is fastened above the bearing portion 31 of the first fixing frame 30 and the second fixing frame 40 by round screws 51. It is worth explaining that, the utility model discloses coaxial electret speaker 100 carries out the special design on volume and area, and collocation through first mount 30 and second mount 40 can have the function of bearing frequency division drive module 50 and forming the synchronous vibration cavity module, and coaxial design, reducible first speaker module 10 and the shared area of second speaker module 20 to and the interference on the phase place between the two.

Referring to fig. 1C, the dust screen 60 is combined with the second fixing frame 40 to further fix the second speaker module 20. The dust screen 60 has a plurality of through holes 60a on its surface to serve as sound radiation outlets of the second speaker module 20. The through hole 60a has a substantially circular shape. It is worth explaining, the embodiment of the utility model adopts the modularized design, and the design of the reducible cavity shortens the development time.

Next, please refer to fig. 2A, fig. 2B and fig. 2C, in which fig. 2A is an exploded schematic view of a second embodiment of the present invention. Fig. 2B is a schematic perspective view of another viewing angle according to the second embodiment of the present invention. The coaxial electret speaker 100 of the first embodiment differs from the coaxial electret speaker 101 of the second embodiment in that the second speaker module 21 of the second embodiment has a size different from (e.g., larger than or smaller than) the second speaker module 20 of the first embodiment, and the rest of the configurations are the same or similar, and will not be described again.

When the second speaker module 21 changes its size according to the design requirement, the sizes of the dust screen 61 and the recess 41 of the second fixing frame 40 need to be adjusted correspondingly to meet the installation requirement. Similarly, holes are formed on both sides of the circular body of the first fixing frame 30 for corresponding fasteners (e.g., flat screws 53) to pass through, so that the first fixing frame 30 and the second fixing frame 40 can be combined and locked with each other.

Referring to fig. 3, fig. 3 is an exploded schematic view of a second speaker module according to an embodiment of the present invention. The second speaker module 20 includes a ferrite mesh 201, a barrier layer 202 and an electret film 203. The outermost layer of the second speaker module 20 is an iron mesh 201, and sequentially toward the center, a barrier layer 202 and an electret film 203 are laminated and pushed to each other, wherein the barrier layer 202 is disposed between the iron mesh 201 and the electret film 203.

The barrier layer 202 is actually a spacer or a bonding adhesive, which may be implemented by a back adhesive, a double-sided adhesive, an ultraviolet adhesive, a resin, a glue, or other similar materials. In some embodiments, the adhesive may be black glue, spiral glue, or glues with similar properties.

The electret film 203 may be a non-perfluorinated electret polymer material formed by copolymerizing vinylidene fluoride (VdF), the monomer copolymerized with VdF includes Hexafluoropropylene (HFP), Chlorotrifluoroethylene (CTFE), Tetrafluoroethylene (TFE), Polytetrafluoroethylene (PTFE), or any combination thereof, and a partially fluorine-containing polymer copolymer may be used as the material of the electret film 203 to satisfy the conditions of charge stability, processability, and price.

In the first or second embodiment of the present invention, the external shape of the second speaker module 20 is illustrated as a rectangle, but is not limited to this, and the external shape of the second speaker module 20 may be a rectangle, a circle, an ellipse, a triangle, a polygon, an irregular shape, or an arbitrary shape. This can be achieved, for example, by modifying the shape of the ferrous mesh 201, barrier layer 202, and electret film 203.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A coaxial electret speaker, comprising:

a first speaker module driven by an audio signal to generate a low frequency range sound;

the first fixing frame is used for fixing the first loudspeaker module;

a second speaker module driven by the audio signal to generate a middle-high frequency range sound; and

and the second fixing frame is arranged between the first loudspeaker module and the second loudspeaker module and used for fixing the second loudspeaker module and enabling the second loudspeaker module and the first loudspeaker module to be positioned on the same axis, wherein the first fixing frame and the second fixing frame form a synchronous vibration cavity module.

2. The coaxial electret speaker of claim 1, wherein: the frequency division driving module is arranged on the first fixing frame and the second fixing frame, is respectively and electrically connected to the first loudspeaker module and the second loudspeaker module, and is used for generating the audio signal.

3. The coaxial electret speaker of claim 2, wherein: the frequency division driving module is fixedly locked on the first fixing frame and the second fixing frame through at least one screw.

4. The coaxial electret speaker of claim 1, wherein: the first speaker module is a moving coil speaker and the second speaker module is an electret speaker.

5. The coaxial electret speaker of claim 1, wherein: the second speaker module has an external shape of a rectangle, a circle, an ellipse, a triangle, other polygons or an irregular shape.

6. The coaxial electret speaker of claim 1, wherein: the second fixing frame is provided with a concave part corresponding to the appearance shape of the second loudspeaker module so as to accommodate and fix the second loudspeaker module.

7. The coaxial electret speaker of claim 1, wherein: the second speaker module is fixed by the second fixing frame, and the surface of the dust screen is provided with a plurality of through holes to be used as sound radiation outlets of the second speaker module.

8. The coaxial electret speaker of claim 1, wherein: the upper and lower parts of the second fixing frame are respectively provided with a sound outlet to be used as a sound radiation outlet of the first loudspeaker module.