Diaphragm used in speakers

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 over 100 years since the 19th century.

[0003] Generally, electrodynamic direct-radiating speakers are primarily composed of a magnetic circuit, a voice coil partially or completely located within the magnetic circuit, and an audio-radiating diaphragm attached to the voice coil in a mechanical manner. In most cases, they also include other supporting components, such as a diaphragm surround, a spider or suspension, or a frame. Vibrations are generated in the voice coil due to the interaction between the magnetic field generated by AC current flowing through the coil and the magnetic field of the magnetic circuit itself, based on Fleming's law. This in turn generates vibrations in the diaphragm where the coil is attached, and these vibrations are transmitted to other diaphragm areas not directly attached to the voice coil. However, because the processes of sound transmission, absorption (attenuation), and boundary reflection are frequency-dependent and nonlinear, sound is radiated from the entire diaphragm area in a very complex manner. Therefore, the characteristics of the diaphragm, such as its material, manufacturing method, and shape, have a significant impact 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 that is applied to a speaker. [Means for solving the problem]

[0005] The diaphragm includes, 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 made of a hard, homogeneous amorphous material whose internal stress varies depending on 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. Part or all of the upper surface region or the lower surface region has a roughened surface to reduce reflection of surface acoustic waves and reduce weight. A coating layer is formed on part or all of the upper surface region or the lower surface region, or on part or all of 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 side edges located on different sides of the flat region, and the at least two side edges are curved to form a respective curved region, and each side edge of the flat region is curved to form a corresponding curved region.

[0008] In one embodiment, the diaphragm has a continuous wave structure, the amplitude D of which is at least 1 / 10 of the thickness of the diaphragm, and the length λ from peak to peak is at least twice the thickness of the diaphragm. [Brief explanation 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 the appearance of a diaphragm according to one embodiment of the present invention. [Figure 2C] FIG. 2C is a schematic diagram of the appearance of a diaphragm according to one embodiment of the present invention. [Figure 2D] FIG. 2D is a schematic diagram of the appearance 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 the appearance 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 the appearance of a diaphragm according to one embodiment of the present invention. [Figure 5H] FIG. 5H is a schematic diagram of the appearance of a diaphragm according to one embodiment of the present invention. [Figure 5I] FIG. 5I is a schematic diagram of the appearance 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 the appearance of a diaphragm according to one embodiment of the present invention. [Figure 7B] FIG. 7B is a schematic diagram of the appearance 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 INVENTION

[0010] Here, the present invention will be described in detail with respect to specific embodiments and aspects of the invention. These descriptions are intended to interpret the structure, steps, and flow of the present invention and are for illustrative purposes only, and are not intended to limit the scope of the claims of the present invention. Therefore, in addition to the specific and preferred embodiments described in the specification, the present invention can be widely implemented in other different embodiments. Below, specific embodiments will be described to illustrate the present invention. Those familiar with the art will be able to easily understand the effects and advantages of the present invention from the contents disclosed herein. Furthermore, the present invention can also be implemented and practiced in other specific embodiments. The details described in this specification can be adapted to different needs, and various supplements or modifications can be made without departing from the spirit of the present invention.

[0011] The present invention provides novel ideas for the speaker diaphragm from various aspects.

[0012] First, when sound or vibration is transmitted from a first medium to a second medium, energy loss occurs, especially when the two media have different sound velocities or acoustic impedances, even if the two media have the same density. 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] Referring to FIG. 1A, the material used for diaphragm 400 is characterized as being a hard, homogeneous, amorphous material with a gradually varying stress. Silicon dioxide is a common raw material that meets these characteristics. Specifically, silicon dioxide is used to form glass, which is then cut to an appropriate size and heat-treated to enhance its toughness, resulting in tempered glass. This tempered glass meets the requirements for the material used in this embodiment, namely, being hard and homogeneous, amorphous with a gradually varying stress. Of course, other materials may be used as long as they meet the requirements for being hard and homogeneous, amorphous with a gradually varying stress. Diaphragm 400 used in the present invention is made of a hard, homogeneous, amorphous material, but has the physical characteristic of gradually varying stress. 1A, 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. 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 gradually varying stress.

[0014] Specifically, the upper surface region 410, upper transition region 420, central region 430, lower transition region 440, and lower surface region 450 of the diaphragm 400 are all made of the same type of hard, homogeneous, amorphous material, but each region has a different level of internal stress. The differences in internal stress cause the media to have different sound velocities or acoustic impedances, resulting in slight differences in the physical vibration characteristics of the diaphragm and appropriate energy loss. This improves the quality of the generated sound. Generally, the internal stresses in the upper surface region 410 and lower surface region 450 are all internal compression stresses with similar strengths, while the internal stress in the central region 430 is internal tension stress. Furthermore, 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 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 is represented by a dotted line in the figure. This is because the boundary is not clear and does not actually exist. In other words, the magnitude of the internal compressive stress at the intersection of 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. Furthermore, the magnitude of the internal tensile stress at the intersection of 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 in the lower transition region 440 is not a fixed value but gradually changes 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 downward transition region 440 in the drawing is shown by a dotted line, because 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. These graduated compression-tension boundaries contribute to good sound quality.

[0015] Additionally, to provide good vibration characteristics, the overall thickness of diaphragm 400 is preferably about 0.1 to 50 micrometers (micrometers, μm). Specifically, the total thickness d1 of upper surface region 410 and upper transition region 420 is preferably about 0.01 to 20 micrometers, and similarly, the total thickness d1 of lower surface region 450 and lower transition region 440 is preferably about 0.01 to 20 micrometers. Furthermore, the thickness d2 of 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. Diaphragm 400a includes upper surface region 410a, central region 430a, and lower surface region 450a. Upper surface region 410a, central region 430a, and lower surface region 450a are all made of a hard, homogeneous, amorphous material. Specifically, the thickness d1 of upper surface region 410a is preferably approximately 0.01 to 20 micrometers, and similarly, the thickness d1 of lower surface region 450a is preferably approximately 0.01 to 20 micrometers. Furthermore, the thickness d2 of central region 430 is preferably approximately 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 drawing, reducing the thickness by etching, and then performing a strengthening process to form a thin diaphragm, where the etched diaphragm 400a 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 by etching, or all or part of the upper surface region and the lower surface region, it is possible to reduce the reflection of surface acoustic waves and reduce the weight.

[0020] According to an embodiment of the present invention, the tempered glass satisfies the requirement for a material used in this embodiment to be hard and homogeneously amorphous with gradually varying stress. Each of the upper surface region 410a, central region 430a, and lower surface region 450a of diaphragm 400a contains a material that is substantially similarly hard, homogeneously amorphous, and has varying internal stress. The internal stress varies with depth from the surface to the center of diaphragm 400a (i.e., varies with the distribution of guest ions during 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 diaphragm material is completed using the technical means shown in FIG. 1. The cross-section 10 of the diaphragm shows a continuous wave shape. Furthermore, during specific manufacturing, the entire diaphragm may have various different shapes. For example, the diaphragm 100a shown in FIG. 2A is a rectangular diaphragm continuously undulating along a specific axial direction (the 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 the diaphragm may be directly flattened to facilitate bonding between the diaphragm 100a and other components of the speaker. Furthermore, the cross-sectional shape obtained at the cross-section line TT' shows a continuous wave shape as shown in FIG. 2A. 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 (the X-axis and the Y-axis in FIG. 2B). Similarly, in this case, the amplitude of the wave may be appropriately reduced, the wavelength may be appropriately extended, or the wave may be directly flattened at the edge of the diaphragm or in the region connected to the voice coil to facilitate connection between the diaphragm 100b and other components of the speaker. 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 exhibits an amplitude D of at least 1 / 10 of the total thickness of the diaphragm (2 × d1 + d2) (see FIG. 2C), and the length λ from peak to peak is at least twice the total thickness of the diaphragm (2 × d1 + d2) (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 obround or racetrack, circular or elliptical, or other diaphragms without holes.

[0025] For a related example, see FIG. 2D . The diaphragm 100c shown in the figure is a circular diaphragm continuously undulating along two different specific axial directions (the X-axis and Y-axis in FIG. 2D ). The alternating dark and light areas in the figure indicate a surface with undulating height. The pixel size 102 of each of the alternating dark and light areas is at least twice the total thickness of the diaphragm (2×d1+d2). Similarly, the amplitude D of the continuous wave structure of the diaphragm is at least 1 / 10 of the total thickness of the diaphragm (2×d1+d2), and the length λ between the peaks is at least twice the total thickness of the diaphragm (2×d1+d2). The dark and light areas may have a more complex shape, such as a regular hexagon, rather than a square or rectangle. Similarly, the amplitude of the wave may be appropriately reduced, the wavelength may be appropriately extended, or the wave may be directly flattened as shown in the figure at the edges of the diaphragm or in the region connected to the voice coil. If the edges are flat, it becomes easier to join the diaphragm 100c to other components in the speaker.

[0026] Furthermore, the diaphragm 100d shown in FIG. 2E is a circular diaphragm that continuously undulates in a circumferential direction (e.g., the 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. Similarly, in this case, 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 2 times 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 (the direction of the cross-sectional line TT'), or may be an embodiment of a diaphragm having the cross section of FIG. 2A in all directions. Furthermore, the diaphragm 100e shown in FIG. 2F is a circular diaphragm that continuously undulates in a circumferential direction. In one embodiment, the continuous wave structure of the diaphragm has an amplitude D of at least 1 / 10 of the total thickness of the diaphragm (2×d1+d2) and a length λ between the peaks of the diaphragm of at least twice the total thickness of the diaphragm (2×d1+d2). In addition, the diaphragm 100d of FIG. 2E and the diaphragm 100e of FIG. 2F may have not only a flat shape as shown in the figure but also other shapes such as a cone or a dome depending on different needs.

[0027] See FIG. 3A, which shows 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 portion of the region of the diaphragm connected to the voice coil is perforated to form a cavity 29. By creating 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-section 20 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. Diaphragms having the cross-section 20 shown in FIG. 3A can also be formed by processing 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.

[0028] Alternatively, a cavity can be formed in the region of diaphragm 100d shown in Fig. 2E that is connected to the voice coil to obtain diaphragm 300 shown in Fig. 4. In one aspect, the cross-sectional shape of diaphragm 300 taken along cross-sectional line TT' is the same as the shape shown in Fig. 2A. In another aspect, the cross-sectional shape obtained by moving cross-sectional line TT' to the position of 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 the flat shape shown in Fig. 5A, the flat shape with a cavity (area surrounded by a dotted line) shown in Fig. 5B, the cone-shaped shape shown in Fig. 5C, the cone-shaped shape with a cavity (area surrounded by a dotted line) shown in Fig. 5D, the tunnel-shaped shape shown in Fig. 5E to Fig. 5F, the dome-shaped shape shown in Fig. 5G, and the 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 also be the continuous wave shape shown in Fig. 2A, the 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 oblong, 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. Also, 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. Reference is now made to FIG. 6A, which is a cross-sectional structural diagram of a composite diaphragm according to one embodiment of the present invention. As shown, composite diaphragm 60a includes first diaphragm 600, second diaphragm 610, and low-density core layer 620 disposed between first diaphragm 600 and second diaphragm 610. Naturally, at least one of first diaphragm 600 and second diaphragm 610 may be completed with diaphragm 400 made of a rigid, homogeneous amorphous material with gradually varying stress, as shown in FIG. 1. In other words, only the first diaphragm 600 may be made of a hard, homogeneous amorphous material with a gradually changing stress, only the second diaphragm 610 may be made of a hard, homogeneous amorphous material with a gradually changing stress, or both the first diaphragm 600 and the second diaphragm 610 may be made of a hard, homogeneous amorphous material with a gradually changing stress. When only the first diaphragm 600 or only the second diaphragm 610 is made of a hard, homogeneous amorphous material with a gradually changing stress, the other diaphragm may be made of a material such as aluminum foil, polymer film, or carbon fiber.

[0033] The low-density core layer 620 is bonded to the first diaphragm 600 and the second diaphragm 610 with an adhesive. The low-density core layer 620 may be made of a material such as polymethacrylimide foam (PMI foam), balsa wood, or epoxy resin with glass microspheres filler, and primarily provides 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.

[0034] Next, reference is made to FIG. 6B, which is a cross-sectional structural diagram of a diaphragm according to one 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 therefore will not be described in detail again. Unlike FIG. 6A, the diaphragm 60b has a corrugated core 630 between the first diaphragm 600 and the second diaphragm 610. As shown in FIG. 6B, the corrugated core 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 with an adhesive, and the second-side supports 630b are bonded to the second diaphragm 610 with an adhesive. Each connecting structure 630c connects one first-side support 630a to 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, 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, a diaphragm 70 that can use the above-described diaphragm structure (e.g., that shown in FIG. 1 and FIG. 6) has a flat region 700 located in the center and curved regions 710 and 720 located on opposite sides of the flat region 700. Also, in another embodiment, refer to FIG. 7B, in addition to the curved regions 710 and 720, the diaphragm 70 further has curved regions 730 and 740 located on opposite sides of the flat region 700. Diaphragms that are made thinner and lighter inevitably warp when their area is increased. Therefore, the presence of the curved regions 710, 720, 730, or 740 can appropriately strengthen the overall stiffness of the diaphragm 70. Furthermore, although the diaphragm shown in Figures 7A and 7B is rectangular, in practice, if necessary, the diaphragm may be designed as a polygon with 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] Referring to FIG. 8, which is a schematic diagram of a portion of the structure of a speaker according to an embodiment of the present invention, the diaphragm used in speaker 80 may be diaphragm 70 shown in FIG. 7A or 7B. However, FIG. 8 only illustrates flat region 700 and curved regions 710 and 720 to illustrate the relative positional relationship between the diaphragm and other components of speaker 80. As shown in FIG. 8, speaker 80 mainly includes a bottom 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 diaphragm 70. The flat region 700 of diaphragm 70 completely covers permanent magnet 820, and also covers the contact portion of frame 830 with permanent magnet 820. Therefore, 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. Furthermore, the height of the parts formed by the curved regions 710 and 720 can be absorbed by the space below the surround 840, so 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 Figures 3A to 3B, but does not have to be completely flat with no curved surface change in three-dimensional space.

[0038] Using the examples provided in each aspect above, those skilled in the art can combine all or part of the ideas to manufacture corresponding diaphragms. Furthermore, by using the ideas presented in this invention, more materials, more curved surface variations in three-dimensional space, and more structures and appearances can be selected for the design of diaphragm manufacturing. This allows the speaker to be installed in a wider range of locations and its appearance to be more inconspicuous and blend in with the surrounding environment.

[0039] The above description is a preferred embodiment of the present invention. Those skilled in the art should understand that the above is merely illustrative of the present invention and should not be construed as limiting the scope of the rights claimed by the present invention. The scope of protection of the rights is determined based on the scope of the following claims and their equivalent fields. Any modifications or additions made by those skilled in the art without departing from the spirit or scope of the patent are considered equivalent changes or designs completed under the spirit of the disclosure of the present invention and are intended to be included in the scope of the following claims. [Explanation of symbols]

[0040] 10,20 cross section 29 Cavity 60a, 60b, 70, 100a, 100b, 100c, 100d, 100e, 200, 300, 400, 400a diaphragm 80 speakers 410,410a Top area 420 Upper Transition Region 430,430a central area 440 Downward Transition Zone 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 Upper Plate 820 Permanent Magnet 830 frames 840 Surround 850 voice coil 860 Upper iron plate d1, d2 thickness SS',TT' Section line

Claims

1. A glass diaphragm used in a speaker, which consists of the following parts from top to bottom: top area, central area, a lower surface region; the diaphragm, including the upper surface region, the central region, and the lower surface region, is made of an integrally formed homogeneous amorphous material; the internal stress of the diaphragm gradually changes depending on the depth from the surface to the center of the diaphragm; a coating layer for increasing the damping of the diaphragm is formed on a part or all of the upper surface region or the lower surface region, or on a part or all of the upper surface region and the lower surface region; A glass diaphragm in which part or all of the upper surface region or the lower surface region includes a rough surface for reducing reflection of surface acoustic waves.

2. 2. The glass diaphragm used in a speaker according to claim 1, wherein the thickness of the diaphragm is 50 micrometers or less and 0.1 micrometers or more.

3. 3. A glass diaphragm for use in 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. A glass diaphragm applied to a speaker as described in claim 1, wherein the rough surface is used to reduce weight.

5. A glass diaphragm applied to a speaker as described in claim 1, wherein the coating layer contains aluminum, nickel, copper, diamond, polymer or resin.

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