Diaphragm for speaker

Abstract

To provide a diaphragm for a speaker, with appropriate energy-loss beneficial to the quality of the generated speech.SOLUTION: A diaphragm 400a includes, from top to bottom, an upper surface region 410a, a central region 430a, and a lower surface region 450a. The upper surface region, the central region, and the lower surface region are all made of a homogeneous amorphous material, and the homogeneous amorphous material includes silicon dioxide. The diaphragm is a hard, homogeneous, amorphous material with a variable internal stress, and the stress varies with the depth from the surface to the center of the diaphragm. The thickness d1 of the upper surface region 410a is preferably about 0.01 to 20 micrometers, and similarly, the thickness d1 of the lower surface region 450a is preferably about 0.01 to 20 micrometers. The thickness d2 of the central region 430 is preferably about 0.02 to 49.9 micrometers.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present invention relates to the technical field of speakers, and more particularly to a diaphragm applied to a speaker. [Background technology]

[0002] A speaker is a device that converts electrical signals into sound, and has a history of development spanning more than 100 years since the 19th century.

[0003] In general, an electrodynamic direct radiation type speaker mainly consists of a magnetic circuit part, a voice coil partially or completely located in the magnetic circuit part, and a sound radiating diaphragm attached to the voice coil in a mechanical manner. In most cases, it also includes other supporting parts such as a diaphragm surround, a spider or suspension, a frame, etc. Vibration occurs in the coil (voice coil) due to the interaction between the magnetic field generated by the flow of an alternating current through the coil and the magnetic field of the magnetic circuit part itself based on Fleming's law. In addition, vibration is also generated in the diaphragm at the attachment part, and the vibration is transmitted to other diaphragm areas that are not directly attached to the coil. However, since the processes of sound transmission, absorption (attenuation), and boundary reflection are frequency-related and nonlinear, sound is radiated from the entire diaphragm area in a very complicated form to generate sound. Therefore, the characteristics of the diaphragm, such as the material, manufacturing method, and shape, have a significant effect on the sound generation quality of the speaker. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a diaphragm adapted for use in a speaker. [Means for solving the problem]

[0005] The diaphragm includes, in order from top to bottom, an upper surface region, a central region, and a lower surface region. The upper surface region, the central region, and the lower surface region are all made of a homogeneous amorphous material, and the homogeneous amorphous material includes silicon dioxide. The diaphragm is a hard, homogeneous, amorphous material whose internal stress varies with the depth from the surface to the center of the diaphragm.

[0006] In one embodiment, the thickness of the diaphragm is 50 micrometers or less and 0.1 micrometers or more. The thickness of the upper surface region is 20 micrometers or less and 0.01 micrometers or more. The thickness of the central region is 49.9 micrometers or less and 0.02 micrometers or more. The thickness of the lower surface region is 20 micrometers or less and 0.01 micrometers or more. The upper surface region or a part or all of the lower surface region has a rough surface to reduce reflection of surface acoustic waves and reduce weight. A coating layer is formed on the upper surface region or a part or all of the lower surface region, or on the upper surface region and the lower surface region, to increase the damping of the diaphragm. The coating layer is aluminum, nickel, copper, diamond, resin or polymer.

[0007] In one embodiment, the diaphragm includes a flat region and at least two sides located on different sides of the flat region, and the at least two sides are curved to form a respective curved region, and each side of the flat region is curved to form a corresponding curved region.

[0008] In one embodiment, the diaphragm has a continuous corrugated structure, the amplitude D of which is greater than or equal to 1 / 10 of the thickness of the diaphragm and the length λ from peak to peak is greater than or equal to twice the thickness of the diaphragm. [Brief description of the drawings]

[0009] [Figure 1A]FIG. 1A is a cross-sectional structural diagram of a diaphragm according to one embodiment of the present invention. [Figure 1B] FIG. 1B is a cross-sectional structural diagram of a diaphragm according to one embodiment of the present invention. [Figure 2A] FIG. 2A is a schematic diagram of a cross section of a diaphragm according to one embodiment of the present invention. [Figure 2B] FIG. 2B is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 2C] FIG. 2C is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 2D] FIG. 2D is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 2E] FIG. 2E is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 2F] FIG. 2F is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 3A] FIG. 3A is a schematic diagram of a cross section of a diaphragm according to one embodiment of the present invention. [Figure 3B] FIG. 3B is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram of the appearance of a diaphragm according to one embodiment of the present invention. [Figure 5A] FIG. 5A is a side view of a diaphragm according to one embodiment of the present invention. [Figure 5B] FIG. 5B is a side view of a diaphragm according to one embodiment of the present invention. [Figure 5C] FIG. 5C is a side view of a diaphragm according to one embodiment of the present invention. [Figure 5D] FIG. 5D is a side view of a diaphragm according to one embodiment of the present invention. [Figure 5E] FIG. 5E is a side view of a diaphragm according to one embodiment of the present invention. [Figure 5F] FIG. 5F is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 5G] FIG. 5G is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 5H] FIG. 5H is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 5I] FIG. 5I is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 6A] FIG. 6A is a cross-sectional structural diagram of a diaphragm according to one embodiment of the present invention. [Figure 6B] FIG. 6B is a cross-sectional structural diagram of a diaphragm according to one embodiment of the present invention. [Figure 7A] FIG. 7A is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 7B] FIG. 7B is a schematic diagram of an exterior view of a diaphragm according to one embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram of a partial structure of a speaker according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Here, the present invention describes in detail specific examples and aspects of the invention. These descriptions are intended to interpret the structure, steps, and flow of the present invention, and are intended to be explanatory, and are not intended to limit the scope of the claims of the present invention. Therefore, in addition to the specific and preferred examples of the specification, the present invention can be widely implemented in other different examples. Below, the embodiments of the present invention are described by taking specific specific examples. Note that those familiar with the technology can easily understand the effects and advantages of the present invention from the contents disclosed in this specification. In addition, the present invention can be operated and implemented by other specific examples. Each detailed matter described in this specification can be applied according to different needs, and various different supplements or modifications can be made without departing from the spirit of the present invention.

[0011] Regarding the diaphragm of a speaker, the present invention provides novel ideas from various aspects.

[0012] First, when sound or vibration is transmitted from a first medium to a second medium, energy loss occurs even if the two media have the same density, especially when the two media have different velocity-of-sound or acoustic impedance. On the other hand, having an appropriate energy loss is advantageous for the quality of the generated sound. Therefore, in the present invention, this concept is used to construct a speaker diaphragm.

[0013] Please refer to FIG. 1A. The material used for the diaphragm 400 has the characteristic of being a homogeneous amorphous material that is hard and has a gradual change in stress. A raw material that meets such characteristics is generally silicon dioxide. Specifically, glass is formed from silicon dioxide, and the glass is cut to an appropriate size, and then heat treatment is performed to strengthen the toughness, completing the tempered glass. The tempered glass at this time meets the requirement of being a homogeneous amorphous state that is hard and has a gradual change in stress required for the material used in this embodiment. Of course, other materials may be used as long as they meet the requirement of being a homogeneous amorphous material that is hard and has a gradual change in stress. The diaphragm 400 used in the present invention is made of a homogeneous amorphous material that is hard, but has a physical characteristic of being a gradual change in stress. For clarity, the present invention defines an upper surface region 410, an upper transition region 420, a central region 430, a lower transition region 440, and a lower surface region 450 in Fig. 1A. It should be emphasized 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 all belong to a hard, homogeneous, amorphous material, but have the characteristic of a gradual change in stress.

[0014] In detail, 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 type of hard homogeneous amorphous material, but each region has an internal stress with a different intensity. Due to the difference in internal stress, the medium has a different velocity-of-sound or acoustic impedance, so that the physical vibration characteristics exhibited by the diaphragm are slightly different and an appropriate energy loss is provided. This can improve the quality of the generated sound. Generally, the internal stresses of the upper surface region 410 and the lower surface region 450 are all internal compression stresses and have similar in intensity, but the internal stress present in the central region 430 is internal tension stress. In addition, the internal stress of 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 changes gradually and gradually depending on the distance from the upper surface region 410, thereby changing the internal stress from internal compressive stress to internal tensile stress. Therefore, in the present invention, the boundary of the upper transition region 420 in the figure is represented by a dotted line. This is because the boundary is not clear in reality, and does not exist. In other words, the magnitude of the internal compressive stress at the intersection between the upper transition region 420 and the upper surface region 410 is closest to, and therefore equal to, the magnitude of the stress in the upper surface region 410. In addition, the magnitude of the internal tensile stress at the intersection between the upper transition region 420 and the central region 430 is closest to, and therefore equal to, the magnitude of the internal tensile stress in the central region 430. Similarly, the internal stress of the lower transition region 440 is not a fixed value, but changes gradually and gradually depending on the distance from the lower surface region 450, thereby changing the stress from internal compressive stress to internal tensile stress. Therefore, in the present invention, the boundary of the lower transition region 440 in the figure is shown by a dotted line, since in reality the boundary is not clear and does not even exist.That is, the magnitude of the internal compressive stress at the intersection of the lower transition region 440 and the lower surface region 450 is closest to, and therefore equal to, the magnitude of the internal compressive stress in the lower surface region 450. Also, the magnitude of the internal tensile stress at the intersection of the lower transition region 440 and the central region 430 is closest to, and therefore equal to, the magnitude of the internal tensile stress in the central region 430. The above-mentioned graduated compression-tension boundaries can provide good sound quality.

[0015] In addition, in order to provide good vibration characteristics, the total thickness of the diaphragm 400 is preferably about 0.1 micrometer (μm) to 50 micrometers. Specifically, the total thickness d1 of the upper surface region 410 and the upper transition region 420 is preferably about 0.01 to 20 micrometers, and similarly, the total thickness d1 of the lower surface region 450 and the lower transition region 440 is preferably about 0.01 to 20 micrometers. Also, the thickness d2 of the central region 430 is preferably about 0.02 to 49.9 micrometers.

[0016] Furthermore, in order to extend the use of the diaphragm made of the hard, homogeneous, amorphous material presented above to micro-speakers, small speakers, and microphones (e.g., earphones and mobile phone microphones), referring to FIG. 1B, the preferred range of the thickness of the diaphragm 400a should be controlled to 0.1 to 50 micrometers (μm).

[0017] FIG. 1B shows a thinned diaphragm structure. The diaphragm 400a includes an upper surface region 410a, a central region 430a, and a lower surface region 450a. The upper surface region 410a, the central region 430a, and the lower surface region 450a are all made of a hard, homogeneous, amorphous material. Specifically, the thickness d1 of the upper surface region 410a is preferably about 0.01 to 20 micrometers, and similarly, the thickness d1 of the lower surface region 450a is preferably about 0.01 to 20 micrometers. In addition, the thickness d2 of the central region 430 is preferably about 0.02 to 49.9 micrometers.

[0018] According to an embodiment of the present invention, the manufacturing method of the diaphragm 400a includes vitrifying silicon dioxide by fusion draw technology, reducing the thickness by etching, and then performing a strengthening process to form a thin diaphragm. Note that the diaphragm 400a that has been reduced in thickness by etching has a roughened surface.

[0019] According to an embodiment of the present invention, by increasing the surface roughness of all or part of the upper surface region 410a or the lower surface region 450a of the diaphragm 400a, or all or part of the upper surface region and the lower surface region, by etching, it is possible to reduce the reflection of surface acoustic waves and reduce the weight.

[0020] According to the embodiment of the present invention, the tempered glass satisfies the requirement for the material used in the embodiment to be in a homogeneous amorphous state with a hardness and a gradually changing stress. Each of the upper surface region 410a, the central region 430a, and the lower surface region 450a of the diaphragm 400a includes a material that is substantially similarly hard, homogeneous, amorphous, and has a changing internal stress. The internal stress changes with the depth from the surface to the center of the diaphragm 400a (i.e., changes with the distribution of guest ions in the glass tempering process).

[0021] According to an embodiment of the present invention, the damping of the diaphragm 400a can be increased by coating all or part of the upper surface region 410a or the lower surface region 450a, or all or part of the upper surface region and the lower surface region, with aluminum, nickel, copper, diamond, resin or polymer film.

[0022] In another aspect, using the above-mentioned diaphragm structure and material properties, some examples of the new type of diaphragm provided by the present invention will be described from the cross-sectional shape of the diaphragm.

[0023] Please refer to FIG. 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 completed by the technical means shown in FIG. 1. The cross-section 10 of the diaphragm shows a continuous wave shape. In addition, when specifically manufactured, the entire diaphragm may have various different external shapes. For example, the diaphragm 100a shown in FIG. 2A is a rectangular diaphragm that is continuously wavy along one specific axial direction (X-axis in FIG. 2A). At the edge of the diaphragm or the region connected to the voice coil, the wave amplitude may be appropriately reduced, the wavelength may be appropriately extended, or it may be directly flattened in order to facilitate the joining of the diaphragm 100a with other parts in the speaker. In addition, the cross-sectional shape obtained at the cross-sectional line TT' shows a continuous wave shape as shown in FIG. 2A. Also, for example, the diaphragm 100b shown in FIG. 2B is a rectangular diaphragm that continuously forms a wave-like undulation along two different specific axial directions (X-axis and Y-axis in FIG. 2B). In this case, too, in order to facilitate the joining of the diaphragm 100b to other parts of the speaker at the edge of the diaphragm or the region connected to the voice coil, the amplitude of the wave may be appropriately reduced, the wavelength may be appropriately extended, or it may be directly flattened. Also, the cross-sectional shape obtained at the cross-sectional line TT' or the cross-sectional line SS' forms a continuous wave shape as shown in FIG. 2B. In one embodiment, the continuous wave structure of the diaphragm shows an amplitude D of 1 / 10 or more of the total thickness (2×d1+d2) of the diaphragm (see FIG. 2C), and the length λ from peak to peak is more than twice the total thickness (2×d1+d2) of the diaphragm (see FIG. 2C).

[0024] It should be noted that although the overall appearance of the diaphragms 100a and 100b in Figures 2A and 2B described above is rectangular, in some cases the appearance may be other shapes, such as oval or racetrack shaped diaphragms without holes, such as circular or elliptical shaped diaphragms.

[0025] For a related example, refer to FIG. 2D. The diaphragm 100c shown in the figure is a circular diaphragm that continuously forms a wave-like undulating shape along two different specific axial directions (X-axis and Y-axis in FIG. 2D). The alternating dark and light parts in the figure indicate that the surface has undulating heights. The pixel size 102 of each of the alternating dark and light parts is more than twice the total thickness of the diaphragm (2×d1+d2). In this case as well, the amplitude D of the continuous wave structure of the diaphragm is more than 1 / 10 of the total thickness of the diaphragm (2×d1+d2), and the length λ between the peaks is more than twice the total thickness of the diaphragm (2×d1+d2). Note that the dark and light parts may be not only square or rectangular, but also somewhat complicated shapes such as regular hexagons. In this case as well, the amplitude of the wave may be appropriately reduced, the wavelength may be appropriately extended, or it may be directly flattened as shown in the figure at the edge of the diaphragm or the area connected to the voice coil. If the edges are flat, it is easier to join the diaphragm 100c to other components in the speaker.

[0026] Also, the diaphragm 100d shown in FIG. 2E is a circular diaphragm that is continuously undulated in a circumferential direction (for example, the extension direction of the cross-sectional line TT'). In one embodiment, the azimuth angle ψ for each modulation in the continuous wave structure (i.e., for each unit wavelength in the continuous wave structure) may be in the range of 0.1 to 180 degrees. In this case as well, the amplitude D of the continuous wave structure of the diaphragm is 1 / 10 or more of the total thickness of the diaphragm (2×d1+d2), and the length λ from peak to peak is twice or more of the total thickness of the diaphragm (2×d1+d2). The above diaphragm may have the cross section of FIG. 2A in either direction (extension direction of the cross-sectional line TT'), or may be an embodiment of a diaphragm that has the cross section of FIG. 2A in all directions. Furthermore, the diaphragm 100e shown in FIG. 2F is a circular diaphragm that is continuously undulated in a circumferential direction. In one embodiment, the continuous corrugated structure of the diaphragm has an amplitude D of 1 / 10 or more of the total thickness (2×d1+d2) of the diaphragm, and a length λ between the peaks of the diaphragm of 2 times or more of the total thickness (2×d1+d2) of the diaphragm. In addition, the diaphragm 100d of FIG. 2E and the diaphragm 100e of FIG. 2F may have other shapes, such as a cone shape or a dome shape, in addition to the flat shape shown in the figure, depending on different needs.

[0027] Please refer to FIG. 3A, which is a cross-sectional view of a diaphragm according to another embodiment of the present invention. The cross-section 20 of the diaphragm in this embodiment also has a continuous wave shape, but a part of the region of the diaphragm connected to the voice coil is perforated to form a cavity 29. By forming a cavity in the region of the diaphragm 100a shown in FIG. 2A, the diaphragm 100b shown in FIG. 2B, the diaphragm 100c shown in FIG. 2D, and the diaphragm 100e shown in FIG. 2F connected to the voice coil, a diaphragm having the cross-sectional view of the diaphragm shown in FIG. 3A can be obtained. For example, referring to FIG. 3B, the diaphragm 200 shown in the figure is formed by perforating one cavity 29 in the region of the diaphragm 100e shown in FIG. 2F connected to the voice coil. By treating the diaphragm 100a shown in FIG. 2A, the diaphragm 100b shown in FIG. 2B, and the diaphragm 100c shown in FIG. 2D in the same manner, a diaphragm having the cross-section 20 shown in FIG. 3A can be formed.

[0028] In addition, it is also possible to obtain the diaphragm 300 shown in Fig. 4 by forming a cavity in the region of the diaphragm 100d shown in Fig. 2E that is connected to the voice coil. In one aspect, the cross-sectional shape of the diaphragm 300 obtained at the cross-sectional line TT' is the same as the shape shown in Fig. 2A. In another aspect, the cross-sectional shape obtained when the cross-sectional line TT' is moved to the position of the cross-sectional line SS' is similar to the shape shown in Fig. 3A.

[0029] In summary, the cross section of the diaphragm provided in this embodiment can be of two types: one that has a continuous wave shape, and one that has a continuous wave shape but the waves are interrupted by a cavity at the connection point of the diaphragm with the voice coil.

[0030] The cross-sectional shape of the diaphragm manufactured using the above structure can be various shapes such as a flat shape shown in Fig. 5A, a flat shape with a cavity (area surrounded by a dotted line) shown in Fig. 5B, a cone-shaped shape shown in Fig. 5C, a cone-shaped shape with a cavity (area surrounded by a dotted line) shown in Fig. 5D, a tunnel-shaped shape shown in Fig. 5E to Fig. 5F, a dome-shaped shape shown in Fig. 5G, and a dome-shaped shape with additional blades shown in Fig. 5H to Fig. 5I. Naturally, the shape of a small area on the surface of these diaphragms may be a continuous wave shape shown in Fig. 2A, a continuous wave-shaped surface with a cavity shown in Fig. 3A, etc.

[0031] Therefore, the plan view of the outer edge shape of the diaphragm manufactured using the above structure can be, for example, a circle, a rectangle, an oval / elliptical, an obround, a polygon, or any other irregular shape. In an embodiment in which the outer edge shape of the dome-shaped diaphragm is completed as a rectangle, the perspective view of the overall appearance is as shown in FIG. 5F. In an embodiment in which the outer edge shape of the dome-shaped diaphragm is completed as a circle, the perspective view of the overall appearance is as shown in FIG. 5G.

[0032] In addition to the above structure, a composite diaphragm structure may be constructed using the diaphragm structure shown in FIG. 1 and other materials. Here, reference is made to 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, a composite diaphragm 60a includes a first diaphragm 600, a second diaphragm 610, and a low-density core layer 620 provided 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 completed with the diaphragm 400 made of a homogeneous amorphous material that is hard and has a gradually varying stress, as shown in FIG. 1. In other words, only the first diaphragm 600 may be made of a homogeneous amorphous material that is hard and has a gradually changing stress, only the second diaphragm 610 may be made of a homogeneous amorphous material that is hard and has a gradually changing stress, or both the first diaphragm 600 and the second diaphragm 610 may be made of a homogeneous amorphous material that is hard and has a gradually changing stress. When only the first diaphragm 600 or only the second diaphragm 610 is made of a homogeneous amorphous material that is hard and has a gradually changing stress, the other diaphragm may be made of a material such as aluminum foil, polymer film, or carbon fiber.

[0033] In addition, the low-density core layer 620 is bonded to the first diaphragm 600 and the second diaphragm 610 by an adhesive. The low-density core layer 620 may be made of a material such as polymethacrylimide foam (PMI form), balsa wood, or epoxy with glass microspheres filler, and mainly provides a material with a lower density than the first diaphragm 600 and the second diaphragm 610, thereby reducing the mass of the entire composite diaphragm 60a.

[0034] Next, please refer to FIG. 6B, which is a cross-sectional structural diagram of a diaphragm according to an embodiment of the present invention. The diaphragm 60b shown in FIG. 6B has a first diaphragm 600 and a second diaphragm 610 similar to the diaphragm 60a shown in FIG. 6A, and will not be described in detail here. The difference from FIG. 6A is that the diaphragm 60b has a corrugated structure (corrugated core) 630 between the first diaphragm 600 and the second diaphragm 610. As shown in FIG. 6B, the corrugated structure 630 has a plurality of first side supports 630a, a plurality of second side supports 630b, and a plurality of connecting structures 630c. The first side supports 630a are bonded to the first diaphragm 600 by adhesive, and the second side supports 630b are bonded to the second diaphragm 610 by adhesive. Each connecting structure 630c connects one first side support 630a and one second side support 630b. This ensures that there is sufficient space between the first side support 630a of the wave-like structure 630 and the second diaphragm 610. Alternatively, it ensures that there is sufficient space between the second side support 630b of the wave-like structure 630 and the first diaphragm 600. In addition, the wave-like structure 630 may be made of materials such as aluminum foil, paper, or polymer film.

[0035] Also, please refer to FIG. 7A, which is a schematic diagram of the appearance of a diaphragm in another embodiment developed based on the concept of the present invention. In this embodiment, the diaphragm 70 that can use the above-mentioned diaphragm structure (for example, the one shown in FIG. 1 and FIG. 6) has a flat region 700 located in the center and curved regions 710 and 720 located on both sides opposite to the flat region 700. Also, in another embodiment, please refer to FIG. 7B, in addition to the curved regions 710 and 720, the diaphragm 70 further has curved regions 730 and 740 at other positions on both sides opposite to the flat region 700. When a diaphragm is made thin and lightweight, warping inevitably occurs when the area is increased. Therefore, the presence of the curved regions 710, 720, 730, or 740 makes it possible to appropriately strengthen the overall stiffness of the diaphragm 70. Also, although the diaphragm shown in Figures 7A and 7B is rectangular, in practice, if necessary, the diaphragm may be designed as a polygon having more sides, and at least one pair of two non-adjacent side regions may be appropriately curved to obtain a structure corresponding to curved regions 710 and 720.

[0036] Please refer to FIG. 8, which is a schematic diagram of a part of a structure of a speaker according to an embodiment of the present invention. The diaphragm used in the speaker 80 may be the diaphragm 70 shown in FIG. 7A or FIG. 7B. However, in FIG. 8, only the flat area 700 and the curved areas 710 and 720 are shown to show the relative positional relationship between the diaphragm and other parts in the speaker 80. As shown in FIG. 8, the speaker 80 mainly includes a back plate 800, a top plate 810, a permanent magnet 820, a frame 830, a surround 840, a voice coil 850, a top iron plate 860, and the diaphragm 70. The flat area 700 of the diaphragm 70 completely covers the permanent magnet 820, and further covers the contact portion of the frame 830 with the permanent magnet 820. Thus, the diaphragm 70 does not contact stationary parts of the speaker 80, such as the bottom plate 800, the top plate 810, the permanent magnet 820, and the frame 830, but only contacts moving parts of the speaker, such as the surround 840 and the voice coil 850. Also, the height of the parts formed by the curved regions 710 and 720 can be absorbed in the space below the surround 840, so that the overall thickness of the device does not increase.

[0037] It should be noted that the flat region 700 of the diaphragm 70 described above may have a curved surface change in three-dimensional space as shown in Figures 2A to 2F or 3A to 3B, but does not have to be completely flat with no curved surface change in three-dimensional space.

[0038] Using the embodiments provided in each aspect above, those skilled in the art can combine all or part of the ideas to manufacture the corresponding diaphragm. In addition, using the ideas presented in the present invention, more materials, more curved surface changes in three-dimensional space, more structures and appearances can be selected in the design when manufacturing the diaphragm. This makes it possible to expand the installation location of the speaker and make the appearance more inconspicuous and match the surrounding environment.

[0039] The above description is a preferred embodiment of the present invention. Those skilled in the art should interpret the above as being for the purpose of explaining the present invention, and not as limiting the scope of the rights claimed in the present invention. The scope of protection of the rights shall be determined based on the following claims and their equivalent fields. Any modifications or supplements made by those skilled in the art without departing from the spirit or scope of the present patent shall belong to equivalent modifications or designs completed under the spirit disclosed in the present invention, and shall be included in the following claims. [Explanation of symbols]

[0040] 10,20 Section 29 Cavity 60a, 60b, 70, 100a, 100b, 100c, 100d, 100e, 200, 300, 400, 400a diaphragm 80 Speaker 410,410a Top area 420 Upper Transition Region 430,430a central area 440 Downward Transition Region 450,450a Bottom area 600 1st diaphragm 610 Second diaphragm 620 Low density core layer 630 Wave-like structure 630a First side support 630b Second side support 630c Connection Structure 700 flat area 710,720,730,740 Curved Area 800 Bottom Plate 810 Top Plate 820 Permanent Magnets 830 frames 840 Surround 850 voice coil 860 Upper Iron Plate d1,d2 thickness SS',TT' Section line

Claims

1. A diaphragm applied to a speaker, which is, from top to bottom, top area, central area, a lower surface region; the upper surface region, the central region, and the lower surface region are all made of a homogenous amorphous material; A diaphragm in which an internal stress of the diaphragm changes depending on a depth from a surface to a center of the diaphragm.

2. The diaphragm used in a speaker according to claim 1 , wherein the thickness of the diaphragm is not more than 50 micrometers and not less than 0.1 micrometers.

3. 3. A diaphragm applied to a speaker according to claim 2, wherein the thickness of the upper surface region is 20 micrometers or less and 0.01 micrometers or more, the thickness of the central region is 49.9 micrometers or less and 0.02 micrometers or more, and the thickness of the lower surface region is 20 micrometers or less and 0.01 micrometers or more.

4. The diaphragm applied to a speaker according to claim 1 , wherein a part or all of the upper surface region or the lower surface region has a rough surface for reducing reflection of surface acoustic waves and reducing weight.

5. A diaphragm applied to a speaker according to claim 1, wherein a coating layer for increasing damping of the diaphragm is formed on a part or all of the upper surface region or the lower surface region, or a part or all of the upper surface region and the lower surface region, the coating layer being made of aluminum, nickel, copper, diamond, a polymer or a resin.

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