Vibrating diaphragm suitable for loudspeaker

Abstract

The invention relates to a vibrating diaphragm suitable for a loudspeaker. The vibrating diaphragm sequentially comprises an upper surface area, a lower surface area and an upper surface area from top to bottom, a central region; and a lower surface region; wherein the upper surface area, the central area and the lower surface area are all made of homogeneous amorphous materials, and the homogeneous amorphous materials comprise silicon dioxide; and the vibrating diaphragm is made of a hard homogeneous amorphous material with internal stress change, and the stress change is changed along with the depth from the surface to the center of the vibrating diaphragm.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a diaphragm suitable for a loudspeaker. Background Art

[0002] A speaker is a device that converts electronic signals into sounds. Its development history has lasted for more than a hundred years since the 19th century.

[0003] Generally speaking, an electrodynamic direct radiation loudspeaker is mainly composed of a magnet circuit element, a voice coil partially or completely located in the magnet circuit element, and a sound radiating diaphragm mechanically attached to the voice coil. In most cases, it also includes other supporting components, such as a diaphragm surround, a spider or suspension, a frame, etc. The coil (voice coil) vibrates by utilizing the interaction between the magnetic field generated by the alternating current flowing through the coil and the magnetic field of the magnet circuit component itself according to Fleming's law, and thus drives the attached part of the diaphragm to vibrate, and then transmits the vibration to other diaphragm areas that are not directly attached to the coil. Since the transmission, absorption (attenuation), and boundary reflection processes of sound are frequency-dependent and nonlinear, the sound is radiated from the entire diaphragm area in a very complex pattern to produce sound. Therefore, the material, manufacturing method, shape and other characteristics of the diaphragm greatly affect the sound quality of the loudspeaker. Summary of the invention

[0004] The object of the present invention is to provide a diaphragm suitable for a loudspeaker, the diaphragm comprising, from top to bottom, in order: an upper surface area; a central area; and a lower surface area; wherein the upper surface area, the central area and the lower surface area are all made of homogeneous amorphous materials, the homogeneous amorphous material comprises silicon dioxide; and wherein the diaphragm is a hard homogeneous amorphous material with varying internal stress, wherein the stress variation varies with the depth from the surface to the center of the diaphragm.

[0005] In one embodiment, the thickness of the diaphragm is less than or equal to 50 microns and greater than or equal to 0.1 microns, wherein the thickness of the upper surface area is less than or equal to 20 microns and greater than or equal to 0.01 microns, the thickness of the central area is less than or equal to 49.9 microns and greater than or equal to 0.02 microns, and the thickness of the lower surface area is less than or equal to 20 microns and greater than or equal to 0.01 microns; wherein the upper surface area or part or all of the lower surface area has a roughened surface for reducing surface sound wave reflection and reducing weight; and wherein the upper surface area or part or all of the lower surface area, or the upper surface area and part or all of the lower surface area, form a coating layer for increasing the damping of the diaphragm, and the coating layer is aluminum, nickel, copper, diamond, resin or polymer.

[0006] In one embodiment, the diaphragm includes: a flat area and at least two sides located on different sides of the flat area, and the at least two sides are bent to form a curved area respectively; each side of the flat area is bent into a corresponding curved area.

[0007] In one embodiment, the diaphragm has a continuous wave structure, the amplitude D of which is equal to or greater than 1 / 10 of the thickness of the diaphragm, and the peak-to-peak length λ is equal to or greater than twice the thickness of the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1A FIG. 4 is a cross-sectional structural diagram of a diaphragm according to an embodiment of the present invention.

[0009] Figure 1B FIG. 4 is a cross-sectional structural diagram of a diaphragm according to an embodiment of the present invention.

[0010] Figure 2A FIG. 4 is a schematic cross-sectional view of a diaphragm according to an embodiment of the present invention.

[0011] Figure 2B FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0012] Figure 2C FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0013] Figure 2D FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0014] Figure 2E FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0015] Figure 2F FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0016] Figure 3AFIG. 4 is a schematic cross-sectional view of a diaphragm according to an embodiment of the present invention.

[0017] Figure 3B FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0018] Figure 4 FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0019] Figure 5A FIG. 4 is a side view of a diaphragm according to an embodiment of the present invention.

[0020] Figure 5B FIG. 4 is a side view of a diaphragm according to an embodiment of the present invention.

[0021] Figure 5C FIG. 4 is a side view of a diaphragm according to an embodiment of the present invention.

[0022] Figure 5D FIG. 4 is a side view of a diaphragm according to an embodiment of the present invention.

[0023] Figure 5E FIG. 4 is a side view of a diaphragm according to an embodiment of the present invention.

[0024] Fig. 5F FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0025] Figure 5G FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0026] Figure 5H FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0027] Fig.5I FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0028] Fig. 6A FIG. 4 is a cross-sectional structural diagram of a diaphragm according to an embodiment of the present invention.

[0029] Figure 6B FIG. 4 is a cross-sectional structural diagram of a diaphragm according to an embodiment of the present invention.

[0030] Fig. 7A FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0031] Figure 7B FIG. 4 is a schematic diagram of the appearance of a diaphragm according to an embodiment of the present invention.

[0032] Figure 8 FIG. 4 is a partial structural diagram of a loudspeaker according to an embodiment of the present invention.

[0033] Explanation of symbols:

[0034] 10,20: Section

[0035] 29: Hollow

[0036] 60a,60b,70,100a,100b,100c,100d,100e,200a,300,400,400a:diaphragm 80:speaker

[0037] 410, 410a: upper surface area

[0038] 420: Upper transition area

[0039] 430,430a: Central area

[0040] 440: Lower transition area

[0041] 450,450a: Lower surface area

[0042] 600: First diaphragm

[0043] 610: Second diaphragm

[0044] 620: Low-density core layer

[0045] 630: Wave structure

[0046] 630a: first side support

[0047] 630b: Second side support body

[0048] 630c: Connection structure

[0049] 700: Flat area

[0050] 710,720,730,740: bending area

[0051] 800: Bottom plate

[0052] 810:On the board

[0053] 820: Permanent magnet

[0054] 830: Frame

[0055] 840: Overhang

[0056] 850: Voice coil

[0057] 860: Iron sheet

[0058] d1,d2: thickness

[0059] SS',TT': hatch line DETAILED DESCRIPTION

[0060] Here, the present invention will be described in detail with respect to specific embodiments of the invention and their viewpoints. Such description is for explaining the structure or step flow of the present invention, which is provided for illustrative purposes rather than for limiting the scope of the present invention. Therefore, in addition to the specific embodiments and preferred embodiments in the specification, the present invention can also be widely implemented in other different embodiments. The following describes the implementation of the present invention through specific specific embodiments, and those familiar with this technology can easily understand the effectiveness and advantages of the present invention through the contents disclosed in this specification. The present invention can also be applied and implemented through other specific embodiments, and the various details described in this specification can also be applied based on different needs, and various modifications or changes can be made without departing from the spirit of the present invention.

[0061] For the diaphragm of the loudspeaker, the present invention provides novel ideas in different aspects.

[0062] First, since energy loss will occur when sound or vibration is transmitted from a first medium to a second medium, especially when the two media have different velocities of sound or acoustic impedances, even if the two media have the same density, having appropriate energy loss will be beneficial to the quality of the sound produced. Therefore, this case will use this concept to construct the diaphragm of the speaker.

[0063] See also Figure 1A As shown, the material properties selected for the diaphragm 400 are homogeneous amorphous materials with hardness and gradual stress, and the original material that meets such properties can be common silicon dioxide. Specifically, glass can be made from silicon dioxide, and then the glass can be cut into appropriate sizes and then heat-treated to enhance its toughness, thereby completing a tempered glass. The tempered glass at this time meets the material requirements selected in this embodiment: hardness and gradual stress homogeneity and in an amorphous state. Of course, as long as it is other materials that meet the requirements of hardness and gradual stress homogeneous amorphous materials. Although the diaphragm 400 selected in this case is a hard homogeneous amorphous material, it has the physical property of gradual stress, and in order to clearly explain, this case is Figure 1AThe upper surface region 410, the upper transition region 420, the central region 430, the lower transition region 440 and the lower surface region 450 are respectively defined. It is emphasized again that the upper surface region 410, the upper transition region 420, the central region 430, the lower transition region 440 and the lower surface region 450 are all in this hard homogeneous amorphous material, but have the characteristics of gradual stress.

[0064] Specifically, the upper surface region 410, the upper transition region 420, the central region 430, the lower transition region 440, and the lower surface region 450 of the diaphragm 400 are all made of the same hard homogeneous amorphous material, but different strengths of internal stress exist in each region, and different internal stresses will make the medium have different velocities of sound or acoustic impedances, so that the physical vibration characteristics exhibited by the diaphragm will be slightly different and have appropriate energy losses, so that the sound quality can be better. Generally speaking, the internal stresses of the upper surface region 410 and the lower surface region 450 are both compressive internal stresses and have similar strengths, while the internal stresses in the central region 430 are tensile internal stresses. The internal stress in the upper transition region 420 located at the boundary between the central region 430 and the upper surface region 410 is not a fixed value, but gradually changes in a gradual manner with the distance from the upper surface region 410, thereby causing the internal stress to change from compressive internal stress to tensile stress. For this reason, the boundary of the upper transition region 420 in the present case is expressed by a dotted line, because the boundary is not obvious or even does not exist. Therefore, the compressive internal stress at the junction of the upper transition region 420 and the upper surface region 410 will be closest to or even equal to the stress of the upper surface region 410, while the tensile internal stress at the junction of the upper transition region 420 and the central region 430 will be closest to or even equal to the tensile internal stress of the central region 430. Similarly, the internal stress in the lower transition region 440 is not a fixed value, but gradually changes with the distance from the lower surface region 450 in a gradual manner, thereby causing the stress to change from compressive internal stress to tensile stress. For this reason, the boundary of the lower transition region 440 in the present case is expressed by a dotted line because the boundary is not obvious or even does not exist. Therefore, the magnitude of the compressive internal stress at the junction of the lower transition region 440 and the lower surface region 450 will be closest to or even equal to the magnitude of the compressive internal stress of the lower surface region 450, and the magnitude of the tensile internal stress at the junction of the lower transition region 440 and the central region 430 will be closest to or even equal to the magnitude of the tensile internal stress of the central region 430. The above-mentioned graded compression-tension boundaries where the compressive internal stress gradually changes to the tensile internal stress can obtain better sound quality.

[0065] Furthermore, in order to provide good vibration characteristics, the overall thickness of the diaphragm 400 is preferably about 0.1 micrometers (micrometer, μm) to 50 micrometers. Specifically, the total thickness d1 of the upper surface area 410 and the upper transition area 420 is preferably about 0.01 micrometers to 20 micrometers, the total thickness d1 of the lower surface area 450 and the lower transition area 440 is also preferably about 0.01 micrometers to 20 micrometers, and the thickness d2 of the central area 430 is preferably about 0.02 micrometers to 49.9 micrometers.

[0066] In order to further extend the aforementioned diaphragm with hard homogeneous amorphous material to be applied to miniature or small speakers and microphones, such as microphones for earphones or mobile phones, reference is made to Figure 1B The thickness of the diaphragm 400a should preferably be controlled within a range of 0.1-50 micrometers (μm).

[0067] Figure 1B The thinned diaphragm structure is shown, and the diaphragm 400a includes an upper surface area 410a, a central area 430a, and a lower surface area 450a. The upper surface area 410a, the central area 430a, and the lower surface area 450a are all in this hard homogeneous amorphous material. Specifically, the thickness d1 of the upper surface area 410a is preferably about 0.01 microns to 20 microns, and the thickness d1 of the lower surface area 450a is also preferably about 0.01 microns to 20 microns. As for the thickness d2 of the central area 430, it is preferably about 0.02 microns to 49.9 microns.

[0068] According to an embodiment of the present invention, the method of manufacturing the diaphragm 400a includes forming silicon dioxide into glass by melt-pull technology, thinning the thickness by etching, and then forming a thinned diaphragm by strengthening treatment. The diaphragm 400a thinned by etching has a roughened surface.

[0069] According to an embodiment of the present invention, the upper surface area 410a of the diaphragm 400a, or part or all of the lower surface area 450a, or part or all of the upper surface area and the lower surface area can increase the surface roughness by etching to reduce surface acoustic wave reflection and reduce weight.

[0070] According to the embodiment of the present invention, the tempered glass at this time meets the material requirements selected in this embodiment: hard and homogeneous with gradual stress and in an amorphous state; the upper surface area 410a, the central area 430a, and the lower surface area 450a of the diaphragm 400a, each layer includes basically the same hard homogeneous amorphous material with internal stress variation, wherein the internal stress variation varies with the depth from the surface to the center of the diaphragm 400a (that is, varies with the distribution of guest ions in the glass strengthening process).

[0071] According to an embodiment of the present invention, the upper surface area 410a of the diaphragm 400a, or part or all of the lower surface area 450a, or part or all of the upper surface area and the lower surface area, can increase the damping of the diaphragm by coating with aluminum, nickel, copper, diamond, resin or polymer film.

[0072] On the other hand, the characteristics of the above-mentioned diaphragm structure and materials are used to illustrate some embodiments of the new diaphragm provided by the present invention from the perspective of the cross-sectional shape of the diaphragm.

[0073] Please refer to Figure 2A , which is a cross-sectional view of a diaphragm according to an embodiment of the present invention. In this embodiment, the material of the diaphragm is made by using the technical means shown in FIG1 , wherein the cross-section 10 of the diaphragm presents a continuous wave shape. In the specific production, the entire diaphragm can be made into various shapes. For example, Figure 2B The diaphragm 100a shown is continuous and has a specific axis ( Figure 2B The rectangular diaphragm 100a is undulating along the X-axis in the figure. The wave amplitude at the edge or the area used to connect with the voice coil can be appropriately reduced, the wave wavelength can be appropriately extended, or it can be directly made flat to facilitate the connection between the diaphragm 100a and other components in the speaker. The cross-sectional shape obtained by the section line TT' presents a similar Figure 2A The continuous wave shape shown. For another example, Figure 2C The diaphragm 100b shown is continuous and has two different specific axes ( Figure 2C Similarly, the wave amplitude at the edge or the area used to connect with the voice coil can be appropriately reduced, the wave wavelength can be appropriately extended, or it can be directly made flat to facilitate the connection between the diaphragm 100b and other components in the speaker. Furthermore, the cross-sectional shape obtained by the section line TT' or the section line TT' presents a similar Figure 2AIn one embodiment, the continuous wavy structure of the diaphragm exhibits an amplitude D equal to or greater than 1 / 10 of the total thickness of the diaphragm (2×d1+d2) (see FIG1 ), and a peak-to-peak length λ equal to or greater than 2 times the total thickness of the diaphragm (2×d1+d2) (see FIG1 ).

[0074] It should be noted that although the above Figure 2B and Figure 2C The overall appearance of the diaphragm 100a and the diaphragm 100b is a square, but in different occasions, the appearance can also be made into other shapes, such as an obround, racetrack, circular, or elliptical diaphragm without holes.

[0075] For related examples, please refer to Figure 2D , wherein the diaphragm 100c shown is continuous and has two different specific axes ( Figure 2D The X-axis and Y-axis in the figure) are each a circular diaphragm with undulating shapes, wherein the shadows and bright areas are staggered to represent the undulating surface, wherein the pixel size 102 of each staggered shadow and bright area is equal to or greater than twice the total thickness of the diaphragm (2×d1+d2). Similarly, the amplitude D of the continuous wavy structure of the diaphragm is equal to or greater than 1 / 10 of the total thickness of the diaphragm (2×d1+d2), and the peak-to-peak length λ is equal to or greater than twice the total thickness of the diaphragm (2×d1+d2). In addition to being squares or rectangles, the shadows and bright areas can also be more complex shapes such as regular hexagons. Similarly, the wave amplitude at the edge or the area used to connect to the voice coil can be appropriately reduced, the wave wavelength can be appropriately extended, or it can be directly made flat as shown in the figure, and the flat edge will facilitate the connection of the diaphragm 100c with other components in the speaker.

[0076] In addition, if Figure 2E The diaphragm 100d shown is a circular diaphragm that is continuous and undulating along the circumferential direction (such as the extension direction of the section line TT'). In one embodiment, the azimuth angle ψ of each modulation of the continuous wave structure (that is, in the unit wavelength of the continuous wave structure) can be in the range of 0.1 to 180 degrees. Similarly, the amplitude D of the continuous wave structure of the diaphragm is equal to or greater than 1 / 10 of the total thickness of the diaphragm (2×d1+d2), and the peak-to-peak length λ is equal to or greater than 2 times the total thickness of the diaphragm (2×d1+d2). The above-mentioned diaphragm has in certain directions (the extension direction of the section line TT') Figure 2A The cross-section can also be used as Figure 2A An embodiment of a diaphragm having a diaphragm cross section. Figure 2FThe diaphragm 100e shown is a circular diaphragm that is continuous and undulating along the radial direction. In one embodiment, the continuous wavy structure of the diaphragm presents an amplitude D equal to or greater than 1 / 10 of the total thickness of the diaphragm (2×d1+d2), and a peak-to-peak length λ equal to or greater than twice the total thickness of the diaphragm (2×d1+d2). Furthermore, Figure 2E The diaphragm 100d and Figure 2F The diaphragm 100e can be made into a flat shape as shown in the figure, and can also be made into other shapes according to different needs, such as a cone or a dome.

[0077] Please refer to Figure 3A , which is a cross-sectional view of a diaphragm according to another embodiment of the present invention. The cross-sectional view 20 of the diaphragm in this embodiment also presents a continuous wave shape, but a portion of the area where the diaphragm and the voice coil are connected is hollowed out to form a cavity 29. Figure 2B The diaphragm 100a shown, Figure 2C The diaphragm 100b shown, Figure 2D The diaphragm 100c and Figure 2F By making a cavity in the area where the diaphragm 100e is connected to the voice coil, a Figure 3A For example, see Figure 3B , wherein the diaphragm 200a shown is Figure 2F The diaphragm 100e shown is formed by hollowing out a cavity 29 in the area where it connects with the voice coil. Figure 2B The diaphragm 100a shown, Figure 2C The diaphragm 100b and Figure 2D The diaphragm 100c shown can also be processed by a similar method to become Figure 3A A cross section of the diaphragm 20 is shown.

[0078] In addition, you can also Figure 2E A cavity is made in the area where the diaphragm 100d is connected to the voice coil, and the result is as shown in FIG. Figure 4 From a certain perspective, the cross-sectional shape of the diaphragm 300 along the section line TT' is still the same as that of Figure 2A On the other hand, if the section line TT' is moved horizontally to the position of the section line SS', the shape of the section obtained at this time is the same as Figure 3A Similar to that shown.

[0079] In general, there are two possibilities for the cross-section of the diaphragm provided in this embodiment: one is a continuous wave shape, and the other is a continuous wave shape but with the wave interrupted due to the cavity at the connection between the diaphragm and the voice coil.

[0080] The cross-sectional shape of the diaphragm made by the above structure can be various shapes, for example: Figure 5A Flat as shown, Figure 5B The flat shape with a hole (the area surrounded by the dotted line) shown in Figure 5C Cone-shaped as shown, Figure 5D The cone with a hole (the area surrounded by the dotted line) shown in FIG. Figure 5E-5F The tunnel-shaped Figure 5G The dome-shaped and Figures 5H-5I The dome-shaped structure with wings shown in the figure, etc. Of course, the surface area of ​​these diaphragms can be shaped as follows Figure 2A The continuous wave shape shown, or Figure 3A The wavy surface shown has a continuity of voids, etc.

[0081] Therefore, the outer edge shape of the diaphragm made by the above structure can be the following shapes when viewed from above, such as: circular, rectangular, elliptical (Oval / Elliptical), obround (Obround), polygonal (Polygon) or other irregular shapes. In the embodiment where the outer edge shape of the dome-shaped diaphragm is completed in a rectangular shape, the three-dimensional view of the overall appearance is as follows Fig. 5F As shown in FIG. 1 , the outer edge of the dome-shaped diaphragm is completed in a circular shape, and the overall appearance of the three-dimensional diagram is as follows: Figure 5G shown.

[0082] In addition to the above structure, the diaphragm structure disclosed in FIG. 1 and other materials can also be used to construct a composite diaphragm structure. Fig. 6A, which is a cross-sectional structural diagram of a composite diaphragm according to an embodiment of the present invention. As shown in the figure, the composite diaphragm 60a includes a first diaphragm 600, a second diaphragm 610, and a low-density core layer 620 disposed between the first diaphragm 600 and the second diaphragm 610. Of course, at least one of the first diaphragm 600 and the second diaphragm 610 may be made of the hard and gradually stress homogeneous amorphous material diaphragm 400 disclosed in FIG. 1 . In other words, it is possible that only the first diaphragm 600 is made of a hard and gradually stress homogeneous amorphous material, or only the second diaphragm 610 is made of a hard and gradually stress homogeneous amorphous material, or both the first diaphragm 600 and the second diaphragm 610 are made of a hard and gradually stress homogeneous amorphous material. When only the first diaphragm 600 or only the second diaphragm 610 is made of a hard and gradient stress homogeneous amorphous material, the other diaphragm can be made of materials such as aluminum foil, polymer film or carbon fiber.

[0083] In addition, the low-density core layer 620 is bonded to the first diaphragm 600 and the second diaphragm 610 by an adhesive, and the low-density core layer 620 can be made of materials such as polymethacrylimide foam (PMI form), Balsa wood, epoxy with glass microspheres filler, etc., mainly to provide a material with a lower density than the first diaphragm 600 and the second diaphragm 610, thereby reducing the overall mass of the composite diaphragm 60a.

[0084] Please refer to the following Figure 6B , which is a cross-sectional structural diagram of a diaphragm according to an embodiment of the present invention. Figure 6B The diaphragm 60b shown has Fig. 6A The first diaphragm 600 and the second diaphragm 610 are similar to the diaphragm 60a shown in the figure, and are not described in detail here. Fig. 6A The difference is that in the diaphragm 60b, a corrugated core 630 is disposed between the first diaphragm 600 and the second diaphragm 610. Figure 6BAs shown, the corrugated structure 630 has a plurality of first side supports 630a, a plurality of second side supports 630b, and a plurality of connection structures 630c. The first side supports 630a are bonded to the first diaphragm 600 by an adhesive, and the second side supports 630b are bonded to the second diaphragm 610 by an adhesive. Each connection structure 630c connects a first side support 630a and a second side support 630b to ensure that there is enough space between the first side support 630a of the corrugated structure 630 and the second diaphragm 610, or to ensure that there is enough space between the second side support 630b of the corrugated structure 630 and the first diaphragm 600. Furthermore, the corrugated structure 630 can be made of materials such as aluminum foil, paper, or polymer film.

[0085] Please refer to Fig. 7A , which is a schematic diagram of the appearance of a diaphragm according to another embodiment of the present invention. In this embodiment, the diaphragm 70 to which the above-mentioned diaphragm structure (such as shown in FIG. 1 and FIG. 6 ) can be applied has a flat area 700 located in the center, and curved areas 710 and 720 located on opposite sides of the flat area 700. In another embodiment, please refer to Figure 7B In addition to the curved areas 710 and 720, the diaphragm 70 also has curved areas 730 and 740 at the positions on the opposite sides of the other set of flat areas 700. Since the thin and lightweight diaphragm will inevitably bend when the area increases, the existence of the curved areas 710, 720, 730 or 740 can appropriately strengthen the overall stiffness of the diaphragm 70. In addition, although Fig. 7A and Figure 7B The diaphragm shown is a quadrilateral, but in fact the diaphragm can be designed to be a polygon with more sides as required, and at least one set of two non-adjacent side areas can be appropriately bent to obtain a structure equivalent to the bent areas 710 and 720.

[0086] Please refer to Figure 8 , which is a partial structural diagram of a speaker according to an embodiment of the present invention. The diaphragm used in the speaker 80 may be Fig. 7A or Figure 7B The diaphragm 70 shown, but in Figure 8 Only the flat area 700 and the curved areas 710 and 720 are shown to illustrate the relative positional relationship between the diaphragm and other components in the speaker 80. Figure 8As shown, the speaker 80 mainly includes a back plate 800, a washer 810, a permanent magnet 820, a frame 830, a surround 840, a voice coil 850, a top iron plate 860 and a diaphragm 70. The flat region 700 of the diaphragm 70 completely covers the permanent magnet 820, and even covers the portion of the frame 830 that contacts the permanent magnet 820. Therefore, the diaphragm 70 will not touch the stationary components in the speaker 80, such as the back plate 800, the washer 810, the permanent magnet 820 and the frame 830, but will only touch the movable components in the speaker, such as the surround 840 and the voice coil 850. The height of the components caused by the curved regions 710 and 720 can be absorbed by the space under the surround 840, so the thickness of the device as a whole will not be increased.

[0087] It is worth noting that on the flat area 700 of the diaphragm 70, there may be FIG. 2A to FIG. 2F , or as FIG. 3A to FIG. 3B The three-dimensional surface changes shown are not necessarily completely flat without three-dimensional surface changes.

[0088] Through the embodiments provided by the above aspects, the technical field can combine all or part of the ideas to produce a corresponding diaphragm. Through the ideas provided by the present invention, more materials, more three-dimensional curved surface changes, more structures and appearances can be used as design options when making diaphragms, so the speaker can be placed in a wider range of places, and the appearance can be more compatible with the surrounding environment without being obtrusive.

[0089] The above contents are preferred embodiments of the present invention. Those skilled in the art should understand that they are used to illustrate the present invention, not to limit the scope of the patent rights claimed by the present invention. The scope of patent protection shall be determined by the scope of the attached patent application and its equivalent field. Any changes or modifications made by those skilled in the art who are familiar with this field without departing from the spirit or scope of this patent shall be equivalent changes or designs completed under the spirit disclosed by the present invention and shall be included in the scope of the following patent application.

Claims

1. A diaphragm suitable for a loudspeaker, characterized in that: The diaphragm includes, from top to bottom: an upper surface area; a central area; Surface area: wherein the upper surface region, the central region and the lower surface region are all made of homogeneous amorphous material, and the homogeneous amorphous material comprises silicon dioxide; and The diaphragm is a hard homogeneous amorphous material with changing internal stress, and the change in internal stress varies with the depth from the surface to the center of the diaphragm.

2. The diaphragm suitable for a loudspeaker according to claim 1, characterized in that: The thickness of the diaphragm is less than or equal to 50 micrometers and greater than or equal to 0.1 micrometers.

3. The diaphragm suitable for a loudspeaker according to claim 2, characterized in that: The thickness of the upper surface area is less than or equal to 20 microns and greater than or equal to 0.01 microns, the thickness of the central area is less than or equal to 49.9 microns and greater than or equal to 0.02 microns, and the thickness of the lower surface area is less than or equal to 20 microns and greater than or equal to 0.01 microns.

4. The diaphragm suitable for a loudspeaker according to claim 1, characterized in that: Part or all of the upper surface area or the lower surface area has a roughened surface for reducing surface acoustic wave reflection and reducing weight.

5. The diaphragm suitable for a loudspeaker according to claim 1, characterized in that: The upper surface area or part or all of the lower surface area, or part or all of the upper surface area and the lower surface area, forms a coating layer for increasing the damping of the diaphragm.

6. The diaphragm suitable for a loudspeaker according to claim 5, characterized in that: The coating layer is aluminum, nickel, copper or diamond.

7. The diaphragm suitable for a loudspeaker according to claim 4, characterized in that: The coating layer is a polymer or a resin.

8. The diaphragm suitable for a loudspeaker according to claim 1, characterized in that: The diaphragm includes: a flat area and at least two side edges located at different sides of the flat area, and the at least two side edges are bent to form a bent area respectively.

9. The diaphragm suitable for a loudspeaker according to claim 7, characterized in that: Each side of the flat area is bent into a corresponding bent area.

10. The diaphragm suitable for a loudspeaker according to claim 1, characterized in that: The diaphragm has a continuous wave structure, an amplitude D of which is equal to or greater than 1 / 10 of the thickness of the diaphragm, and a peak-to-peak length λ is equal to or greater than twice the thickness of the diaphragm.

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