CN210112270U

CN210112270U - Waterproof ventilated membrane and micro loudspeaker adopting same

Info

Publication number: CN210112270U
Application number: CN201920749042.3U
Authority: CN
Inventors: 周宇轩
Original assignee: Shenzhen Yisheng Acoustics Technology Co Ltd
Current assignee: Shenzhen Yisheng Acoustics Technology Co Ltd
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2020-02-21
Anticipated expiration: 2029-05-23

Abstract

The utility model provides a waterproof ventilated membrane and have this waterproof ventilated membrane's micro loudspeaker. The waterproof breathable film comprises: a diaphragm having a first surface and a second surface opposite the first surface; a plurality of first layer apertures extending into the diaphragm from a first surface of the diaphragm; a plurality of second layer apertures extending into the diaphragm from the second surface of the diaphragm; each second layer hole is opposite to at least one first layer hole, and the second layer holes are communicated with the opposite first layer holes to form through holes penetrating through the membrane. Thus, the utility model provides a waterproof ventilated membrane not only can guarantee the logical sound quality of ventilating, can also have sufficient membrane thickness to alright in order to guarantee the intensity of waterproof ventilated membrane, thereby can improve its waterproof degree of depth.

Description

Waterproof ventilated membrane and micro loudspeaker adopting same

[ technical field ] A method for producing a semiconductor device

The utility model belongs to the micro loudspeaker field, more specifically relates to a waterproof ventilated membrane and have this waterproof ventilated membrane's micro loudspeaker.

[ background of the invention ]

Many devices such as existing smart phones, tablet computers and watches capable of communicating have waterproof requirements. In order to achieve better waterproof effect, the best method is to make the equipment into a fully closed state. With the wide application of wireless charging and wireless earphones, the number of holes in devices such as smart phones, tablet computers and watches capable of communicating is less and less, and only a microphone hole for sound pressure input and a loudspeaker hole for sound pressure output are left in the left holes. This is because the path of sound propagation cannot be completely closed for better sound transmission. How to ensure that the path of sound transmission which is not completely closed can be effectively waterproof is a problem to be solved.

The current technology is to use a waterproof breathable film for waterproof sealing. The existing waterproof breathable films generally used are all organic materials, a plurality of micron-scale small holes are formed in the films, sound can smoothly pass through the small holes, and water cannot pass through the small holes due to tension, so that the waterproof function on a sound transmission path is realized. However, for process reasons, the film must be made thin by making the pores small enough. The organic material is soft and easy to damage, and can be damaged when being touched by hands in the installation process, and special protection needs to be designed in practical application. Secondly, there is an upper limit to the water pressure that can be tolerated, i.e. the depth to which the membrane is waterproofed, due to insufficient strength of the membrane.

The existing technology is to stick a layer of waterproof breathable film on a metal sheet, the metal sheet is provided with big holes, and the metal structure between the holes is used as a reinforcing rib to strengthen the pressure resistance of the organic film. However, the organic film has limited compressive capacity, and even if the organic film is reinforced by a metal structure, the organic film is difficult to meet the increasingly high waterproof requirement proposed by more and more new products.

Therefore, there is a need for an improved solution to overcome the above problems.

[ Utility model ] content

An object of the utility model is to provide a waterproof ventilated membrane and have this waterproof ventilated membrane's micro loudspeaker, the utility model provides a waterproof ventilated membrane can guarantee the logical sound quality of ventilating, also can have sufficient membrane thickness to can guarantee the intensity of waterproof ventilated membrane.

According to an aspect of the utility model, the utility model provides a waterproof ventilated membrane, it includes: a diaphragm having a first surface and a second surface opposite the first surface; a plurality of first layer apertures extending into the diaphragm from a first surface of the diaphragm; a plurality of second layer apertures extending into the diaphragm from the second surface of the diaphragm; each second layer hole is opposite to at least one first layer hole, and the second layer holes are communicated with the opposite first layer holes to form through holes penetrating through the membrane.

According to another aspect of the present invention, the present invention provides a micro speaker, which includes a housing, a motor assembly located in the housing, and a vibrating plate connected to the inner side wall of the housing. The board that shakes with the utility model provides an above-mentioned waterproof ventilated membrane integration is on a membrane.

Compared with the prior art, the utility model discloses a mode that two-sided punched makes the through-hole that runs through the diaphragm. Thus, the utility model provides a waterproof ventilated membrane not only can guarantee the logical sound quality of ventilating, can also have sufficient membrane thickness to alright in order to guarantee the intensity of waterproof ventilated membrane, thereby can improve its waterproof degree of depth.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:

FIG. 1 is a schematic view of a partial longitudinal cross section of a film directly after perforation;

FIG. 2 is a schematic longitudinal sectional view of a diaphragm perforated by an anisotropic etching process;

FIG. 3 is a flow diagram of a method of making a waterproof breathable membrane according to one embodiment of the present invention;

FIG. 4 is a schematic view, partially in longitudinal section, of a waterproof, breathable membrane made by the method of FIG. 3 according to one embodiment of the present invention;

FIG. 5 is a schematic view, partially in longitudinal section, of a waterproof, breathable membrane made by the method of FIG. 3 according to another embodiment of the present invention;

FIG. 6 is a top view of a different shape of the double-sided offset hole made by the method of manufacturing the waterproof breathable film shown in FIG. 3;

FIG. 7 illustrates an additive crater process;

FIG. 8 is a schematic diagram of a pressurized liquid material necking process.

[ detailed description ] embodiments

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.

The utility model discloses the shape of the "hole" of middle finger can be various cross sectional shape, for example circular, square, rectangle etc., and the aperture refers to the maximum width or the minimum width of the cross-section of hole, and not necessarily the diameter of circular port, for example the cross-section of hole is the square, so the aperture of this hole can refer to the diagonal length of square or the length of a limit, and the diameter word in the diameter of hole does not also mean that the cross-section of hole must be circular yet, and the diameter at this moment is a broad concept, can refer to the maximum width or the minimum width of the cross-section of hole, for example the diameter of slot can refer to the length of the diagonal or the minor face of slot.

In waterproof ventilated membrane, the effective through-hole area per unit area means: the diameter of each through-hole may vary on the membrane (or membrane sheet), the area at the smallest diameter of each through-hole being the hole effective through-hole area, and the sum of the hole effective through-hole areas of all the through-holes on the membrane per unit area being the unit area effective through-hole area (hereinafter simply referred to as effective area). Obviously, to increase the effective via area per unit area, on one hand, the variation of the aperture of the holes is small as much as possible, and on the other hand, the density of the holes is increased.

One of the major manufacturing difficulties of the waterproof breathable film is that, on one hand, the diameter of the pores on the film needs to be as small as possible in order to improve the waterproof property of the film, and on the other hand, the film needs to have a certain thickness in order to ensure the strength of the film. The ratio of the depth to the diameter (abbreviated as depth-to-diameter ratio) of the through hole in the film is high, which causes difficulty in processing. The manufacturing process may be selected according to the requirements of the application.

One method is to directly perforate (or perforate a single side of) the prepared film sheet 110 to form a plurality of micron-sized through holes 120, as shown in fig. 1, which is a partial longitudinal sectional view of the film sheet after it is directly perforated. The punching process includes mechanical processing, electric spark processing, laser processing, 3D (3Dimensions, three-dimensional) printing, chemical etching, ion etching, photolithography, and the like. The minimum aperture is about 10 microns, the aperture is large, the water pressure which can be borne by the membrane is not too high, the perforating is difficult if the depth-diameter ratio is high, the mechanical strength requirement of the membrane by mechanical processing is high, and holes cannot be made too densely. Due to the limitation of the size of a light spot, the minimum aperture which can be generally made by laser processing is about 10 microns, the perforating is difficult if the depth-diameter ratio is higher, the processing effect by using ultrafast laser (nanosecond, picosecond and femtosecond laser) is better, but the processing cost of a large number of holes one by one is higher. The problem of high depth-diameter ratio is easy to solve because of additive manufacturing, but the minimum precision of the conventional 3D printing is 10 microns, which means that it is difficult to manufacture deep holes with the diameter of less than 10 microns. By using a chemical etching method, it is possible to manufacture a hole with a small aperture, but the size of the hole is related to the depth of the through hole, the isotropic etching is difficult to manufacture the through hole with a high depth-diameter ratio, and the aperture change is large. In the case of anisotropic etching, there is almost no material with an etching angle close to a right angle in the existing material, which means that the through hole can only be a taper with a certain angle, and only can satisfy the application with low requirement on effective area, as shown in fig. 2, which is a schematic longitudinal cross section of the diaphragm after being punched by the anisotropic etching process, wherein the taper angle of the through hole 220 formed on the diaphragm 210 is fixed. The sizes of the holes of the ion etching and the direct photoetching can be well controlled, but the processing is difficult if the depth-to-diameter ratio is higher, the processing cost is higher, and the performance of the photoetching photoresist serving as a structural material cannot meet the requirement of higher requirement if the photoresist is directly photoetched, and a subsequent reverse mold process is generally combined.

In order to overcome the defect of direct punching on the membrane, the utility model provides an improved manufacturing method of a waterproof breathable membrane. FIG. 3 is a flow chart of a method for making a waterproof breathable membrane according to one embodiment of the present invention; FIG. 4 is a schematic longitudinal sectional view of a portion of a waterproof, breathable membrane made by the method of FIG. 3 according to one embodiment of the present invention; fig. 5 is a schematic longitudinal sectional view of a part of a waterproof and breathable film manufactured by the manufacturing method shown in fig. 3 according to another embodiment of the present invention.

The method for manufacturing the waterproof breathable film shown in fig. 3 will be specifically described below with reference to fig. 4 and 5.

At step 310, a

diaphragm

410, 510 is provided, the

diaphragm

410, 510 having a

first surface

412, 512 and a

second surface

414, 514 opposite the

first surface

412, 512.

At step 320, a plurality of

first layer holes

422, 522 are punched into the

membrane

410, 510 from the

first surface

412, 512 of the

membrane

410, 510 to extend on the

first surface

412, 512 side of the

membrane

410, 510. Wherein the

first layer aperture

422, 522 extends from the

first surface

412, 512 of the

diaphragm

410, 510 into the

diaphragm

410, 510.

At step 330, a plurality of

second layer apertures

424, 524 are formed in the

membrane

410, 510 from the

second surface

414, 514 of the

membrane

410, 510 to form a plurality of

second layer apertures

424, 524 on the

second surface

414, 514 side of the

membrane

410, 510. Wherein the

second layer aperture

424, 524 extends into the

diaphragm

410, 510 from the

second surface

414, 514 of the

diaphragm

410, 510.

Wherein each

second layer aperture

424, 524 is opposite at least one

first layer aperture

422, 522 and the

second layer apertures

424, 524 communicate with their opposite

first layer apertures

422, 522 to form through-

holes

420, 520 through the

diaphragms

410, 510.

In the embodiment shown in fig. 4, one second-layer hole 424 is opposite to one first-layer hole 422, the second-layer hole 424 is arranged in a staggered manner with respect to the opposite first-layer hole 422, and the second-layer hole 424 is communicated with the opposite first-layer hole 422 in a staggered manner, wherein the cross-sectional area of the intersection of the second-layer hole 424 and the opposite first-layer hole 422 is smaller than the cross-sectional area of the second-layer hole 424 and the first-layer hole 422. Because the through hole 420 penetrating through the membrane 410 is formed by double-sided punching, the processing difficulty caused by high depth-diameter ratio of the hole can be overcome, and the minimum aperture (or effective aperture) of the through hole 420 can be reduced by using a dislocation method during punching. The pore size of the first layer of pores and the pore size of the second layer of pores can be generally less than or equal to 50 microns, preferably less than or equal to 20 microns, and the depth-diameter ratio of the first layer of pores to the second layer of pores can be between 1 and 15, preferably between 3 and 15, such as 8 or 10, so as to improve the waterproof function of the membrane.

In the embodiment shown in fig. 5, one second layer of holes 524 is opposite to three first layer of holes 522, wherein the first layer of holes 522 are punched small to ensure that the effective aperture of the through-hole 520 is small; the second layer of holes 524 are drilled larger and communicated with the three first layer of holes 522, and the holes can be drilled deeper than the lower holes at the same depth, so that the film can be thicker and has better strength. In other embodiments, one second layer aperture 524 may be opposite and in communication with 2, 4, or more first layer apertures 522. In a preferred embodiment, the

membranes

410, 510 of the present invention are single layer membranes.

In one embodiment, the drilling process used to form the first layer holes 422, 522 and the second layer holes 424, 524 may be machining, electrical discharge machining, laser machining, 3D printing, chemical etching, ion etching, and/or photolithography. In another embodiment, the

membrane

410, 510 of the present invention may be made of metal, nonmetal, organic material or multiple materials.

It should be noted that: the shapes of the first layer holes 422 and 522 and the second layer holes 424 and 524 obtained by punching in the utility model can be round or square; when the double-sided punching is performed, the first layer holes 422 and 522 and the second layer holes 424 and 524 can be the same in shape or different in shape; dislocation is carried out by utilizing the first layer holes 422 and 522 and the second layer holes 424 and 524 with the same shape or different shapes, so that the effective aperture in the design is obtained; when the staggered punching is carried out, holes on one surface of the membrane (for example, holes on the second layer of the second surface) can be communicated with holes on the other surface (for example, holes on the first layer of the first surface) in a staggered mode, and also can be communicated with holes on the other surface in a staggered mode, so that the processing is more convenient.

Fig. 6 is a top view of a double-sided offset hole (or through hole) with different shapes manufactured by the method for manufacturing the waterproof breathable film shown in fig. 3 according to the present invention. As shown in fig. 6(a), a circular upper-layer hole (which may be referred to as a first-layer hole) is formed on the upper surface (which may be referred to as a first surface) side of the diaphragm, and a circular lower-layer hole (which may be referred to as a second-layer hole) is formed on the lower surface (which may be referred to as a second surface) side of the diaphragm, and the circular upper-layer hole and the circular lower-layer hole are alternately communicated. As shown in fig. 6(b), a square upper hole is formed on the upper surface side of the diaphragm, a square lower hole is formed on the lower surface side of the diaphragm, and the square upper hole and the square lower hole are communicated with each other in a staggered manner. As shown in fig. 6(c), a square upper hole is formed on the upper surface side of the diaphragm, a circular lower hole is formed on the lower surface side of the diaphragm, and the square upper hole and the circular lower hole are communicated with each other in a staggered manner. As shown in fig. 6(d), 4 square upper holes are formed on the upper surface side of the diaphragm, and a corresponding one of the circular lower holes is formed on the lower surface side of the diaphragm, and the 4 square upper holes are in staggered communication with the 1 circular lower hole.

In summary, the utility model adopts a double-sided punching method to make the through hole penetrating the diaphragm, so as to overcome the processing difficulty caused by the high depth-diameter ratio of the hole; and the first layer holes are designed to be communicated with the corresponding second layer holes in a staggered manner so as to reduce the effective aperture of the through holes and prepare micron-sized through holes. Thus, the utility model discloses a waterproof ventilated membrane that two-sided punching method made, the sound quality of ventilating is guaranteed than higher to its effective through-hole area of unit area, and the intensity of membrane is enough guaranteed to its membrane thickness to improve waterproof degree of depth. Furthermore the utility model discloses still can be according to the applied scene design film thickness of difference, indexes such as aperture size and degree of depth select suitable processing mode.

Further, in an embodiment, the waterproof breathable film of the present invention further includes a support frame (not shown) formed with large holes (or through holes), the

membrane

410, 510 formed with the first layer of

holes

422, 522 and the second layer of

holes

424, 524 is attached to the support frame, and the structure between the large holes serves as a reinforcing rib to reinforce the pressure resistance of the

membrane

410, 510. Wherein, the support frame is a metal sheet or a high-strength high polymer material. If the utility model provides a waterproof ventilated membrane's compressive strength is enough high, and waterproof performance can be better, and membrane intensity is high moreover can the direct use, does not need or reduces the support requirement of metal support (or support frame), and the installation operation is also more convenient.

Further, because the utility model discloses a novel waterproof ventilated membrane that two-sided punching method made is more durable than traditional waterproof ventilated membrane, and is durable, and is not fragile, can bear higher water pressure, consequently, the utility model provides a waterproof ventilated membrane can be used for in microphone and the speaker. Because the loudspeaker sound production vibration plate is a film, the loudspeaker sound production vibration plate and the waterproof breathable film can be integrated on one film, and the device cost is reduced. In one embodiment, the micro-speaker includes a housing, a motor assembly located in the housing, and a vibrating plate connected to the inner sidewall of the housing, wherein the vibrating plate and the waterproof and breathable film of the present invention are integrated on a film.

After the through holes are formed in the diaphragm, the effective aperture can be further reduced by adopting a hole shrinkage process to perform hole shrinkage treatment so as to make up for the defects that the processing process is limited and the hole size is difficult to be reduced.

Fig. 7 illustrates that an additive hole shrinking process, such as electroplating, electroforming, chemical deposition, vapor deposition, etc., can slowly accumulate material 730 on the surface of the membrane 710, and has a tendency to close the through holes 720, and the size of the holes on the surface of the membrane can be reduced by controlling the rate of material accumulation and the time of accumulation.

FIG. 8 is a schematic view of a pressurized liquid material necking process. Referring to fig. 8, a rotating liquid or semi-liquid substrate 830 is sprayed or coated on the surface of the membrane 810, and the liquid tends to close the through holes 820 due to the tension. Applying air pressure or other fluid pressure to one side of the membrane 810 will blow the layer of liquid substrate 830 open, and the pressure is controlled appropriately to achieve the effect of reducing the size of the pores after curing the liquid substrate.

It should be noted that those skilled in the art can make modifications to the embodiments of the present invention without departing from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not to be limited to the specific embodiments described above.

Claims

1. A waterproof breathable film, comprising:

a diaphragm having a first surface and a second surface opposite the first surface;

a plurality of first layer apertures extending into the diaphragm from a first surface of the diaphragm;

a plurality of second layer apertures extending into the diaphragm from the second surface of the diaphragm;

each second layer hole is opposite to at least one first layer hole, and the second layer holes are communicated with the opposite first layer holes to form through holes penetrating through the membrane.

2. The waterproof breathable film of claim 1,

the second layer of holes are arranged in a staggered way and communicated with the corresponding first layer of holes,

the effective aperture of the through hole of the diaphragm is micron-sized.

3. The waterproof breathable film of claim 1,

the shape of the second layer of holes is the same as or different from the shape of the first layer of holes opposite to the second layer of holes;

the shape of the first layer of holes is round or square;

the shape of the second layer of holes is round or square,

the pore diameter of the first layer of pores and the pore diameter of the second layer of pores are both less than or equal to 50 microns,

the depth-diameter ratio of the first layer hole to the second layer hole is between 1 and 15.

4. The waterproof breathable film of claim 1,

a second layer of apertures opposite the plurality of first layer of apertures; or

A second layer hole is opposite to a first layer hole, the second layer hole is arranged in a staggered mode with the opposite first layer hole, and the cross-sectional area of the connection portion of the second layer hole and the opposite first layer hole is smaller than that of the second layer hole and the first layer hole.

5. The waterproof breathable film of claim 1,

the membrane is made of metal, nonmetal, organic matter or multiple materials,

the first layer of holes are punched on the first surface of the membrane sheet, and the second layer of holes are punched on the second surface of the membrane sheet.

6. The waterproof breathable film of claim 1, further comprising a support frame formed with through holes, wherein the membrane sheet formed with the first layer of holes and the second layer of holes is attached to the support frame.

7. A micro-speaker, which comprises a shell, a motor component positioned in the shell and a vibrating plate connected on the inner side wall of the shell, is characterized in that,

the vibrating plate and the waterproof breathable membrane of any one of claims 1-6 are integrated on one membrane.