Vibrating structure, passive radiator and sound absorbing structure
By increasing the width of the elastic part at the corner of the vibrating mass block and designing it as an arc shape, the problem of stress concentration in the elastic part was solved, thereby improving the durability and space efficiency of the passive radiator and sound-absorbing structure.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NOK CORP
- Filing Date
- 2024-11-01
- Publication Date
- 2026-06-26
AI Technical Summary
In existing vibrating structures, the elastic part is prone to stress concentration during the vibration of the vibrating mass, which can lead to damage.
A vibrating mass block with multiple corners was designed. The elastic part is wider at the corners than in other parts and is arc-shaped, which enhances the flexibility of the corners to reduce stress concentration.
It effectively suppresses stress concentration in the elastic part, improves the durability and space efficiency of the vibrating structure, and is suitable for passive radiators and sound-absorbing structures.
Smart Images
Figure CN122295950A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to vibrating structures, passive radiators, and sound-absorbing structures, and particularly to vibrating structures with vibrating mass blocks, passive radiators, and sound-absorbing structures. Background Technology
[0002] Vibrating structures with vibrating mass blocks have long been used in various devices. For example, vibrating structures with plate-shaped vibrating mass blocks have long been used in passive radiators or sound-absorbing structures.
[0003] In the vibration structure with a plate-shaped vibrating mass as described above, the vibrating mass is supported by a support portion fixed to a housing or the like via an elastic portion, causing the vibrating mass to resonate at a specific frequency. The elastic portion connects the outer periphery of the vibrating mass to the inner periphery of a receiving portion formed on the support portion that accommodates the vibrating mass, and extends in a ring shape along the outer periphery of the vibrating mass. The vibrating mass has an elliptical, rectangular, or circular shape. Furthermore, the shape of the elastic portion on a cross-section along the vibration direction of the vibrating mass is arc-shaped (for example, see Patent Document 1).
[0004] Existing technical documents Invention Patent Documents Invention Patent Document 1: Japanese Patent Application Publication No. 2010-283491 Summary of the Invention
[0005] The problem that the invention aims to solve In the vibrating structure described above, the elastic portion deforms in response to the vibration of the vibrating mass. Depending on the shape of the vibrating mass, stress concentration occurs at locations within the elastic portion, leading to breakage of the elastic portion. For example, in a vibrating structure with a rectangular vibrating mass, stress concentration occurs in portions of the elastic portion corresponding to the corners of the vibrating mass. When stress concentration occurs in the elastic portion, there is a concern about breakage at these stress concentration points.
[0006] Therefore, existing vibrating structures are required to have a design that can prevent stress concentration in the elastic part that deforms with the vibration of the vibrating mass.
[0007] The present invention was made in view of the above-mentioned problems, and its object is to provide a vibration structure, a passive radiator, and a sound-absorbing structure that can suppress stress concentration in the elastic part that deforms with the vibration of the vibrating mass block.
[0008] Methods for solving problems To achieve the above objectives, the vibration structure of the present invention comprises: a vibrating mass block, which is a plate-shaped portion having a first surface and a second surface as a pair of opposing surfaces; a support portion, which is a portion having a space capable of accommodating the vibrating mass block; and an elastic portion, which is a portion capable of elastic deformation that connects the vibrating mass block to the support portion, the elastic portion extending along the outer periphery of the vibrating mass block, and vibratingly supporting the vibrating mass block relative to the support portion in the direction facing the first surface and the second surface of the vibrating mass block, the vibrating mass block having a plurality of corners on its outer periphery, and the width of a plurality of portions of the elastic portion located at the plurality of corners of the vibrating mass block being wider than the width of other portions of the elastic portion, the width being a distance in the direction of expansion of the surface.
[0009] In one aspect of the vibration structure, the shape of the cross-section orthogonal to the extension direction of the elastic portion is an arc shape protruding in the direction facing the first surface.
[0010] In a vibration structure according to one aspect of the present invention, the width of each of the plurality of portions of the elastic part is maximized at the center of the portion.
[0011] In a vibration structure according to one aspect of the present invention, the maximum width of the plurality of portions is more than twice the width of the other portions of the elastic portion.
[0012] In a vibration structure according to one aspect of the present invention, the widths of the plurality of portions of the elastic part increase from both ends of the portion toward the center.
[0013] In a vibration structure according to one aspect of the present invention, the width of the other portions of the elastic part is constant.
[0014] In a vibration structure according to one aspect of the present invention, the plurality of portions of the elastic portion have the same shape as each other.
[0015] In one aspect of the vibration structure of the present invention, the first and second faces of the vibrating mass block are rectangular in shape, the vibrating mass block has four corners, and the elastic part has four portions.
[0016] In order to achieve the above objectives, the passive radiator of the present invention has the vibration structure described above.
[0017] In a passive radiator according to one aspect of the present invention, the vibrating mass block has: a first plate portion, which is a plate-shaped portion having one of the first surface and the second surface; and a second plate portion, which is a plate-shaped portion having the other of the first surface and the second surface, the first plate portion and the second plate portion being fixed to each other, and the first plate portion, the elastic portion and the support portion being integral.
[0018] In order to achieve the above objectives, the sound-absorbing structure of the present invention has the vibration structure described above.
[0019] In one embodiment of the present invention, the vibrating mass block, the elastic portion, and the support portion are integrated into one unit.
[0020] Invention Effects According to the present invention, stress concentration in the elastic portion that deforms with the vibration of the vibrating mass block can be suppressed. Attached Figure Description
[0021] Figure 1 This is a perspective view showing the schematic configuration of the vibration structure according to the first embodiment of the present invention.
[0022] Figure 2 It is an enlarged representation Figure 1 The front view of section A.
[0023] Figure 3 It means along Figure 1 A cross-sectional view of line BB.
[0024] Figure 4 It means along Figure 1 A cross-sectional view of line CC.
[0025] Figure 5 This is a cross-sectional perspective view showing the general configuration of the vibration structure according to the second embodiment of the present invention.
[0026] Figure 6 This is a partial perspective view showing the schematic configuration of the passive radiator according to an embodiment of the present invention.
[0027] Figure 7 This is a perspective view showing a portion of the sound-absorbing structure according to an embodiment of the present invention.
[0028] Figure 8 It means along Figure 7 A cross-sectional view of line DD.
[0029] Symbol Explanation 1, 2 Vibrating structure (passive radiator), 3 Sound-absorbing structure, 10, 16 Vibrating mass block, 11, 16a Front, 12, 16b Back, 13 Outer perimeter, 14 Corner, 15, 15a, 15b Edge, 17 First plate, 18 Second plate, 18a Front, 18b Back, 20 Support, 21 Space, 22 Inner perimeter, 23 Corner, 24, 24a, 24b Edge, 30 Elastic part, 31 Corner (partial), 31a Central part, 31b, 31c End, 31d, 31e Side, 31f Bottom, 32, 33 Edge, 40 Resonator, 41 Base, 42 Box part, 43 Opening, 44 Top part, 45 Connecting part, 45a Surface, 46 Hole, 50 Shell, t is the thickness, W, W1, w are the widths. Detailed Implementation
[0030] The embodiments of the present invention will now be described with reference to the accompanying drawings.
[0031] Figure 1 This is a perspective view showing the schematic configuration of the vibration structure 1 according to the first embodiment of the present invention. Figure 2 It is an enlarged representation Figure 1 The front view of section A. Additionally... Figure 3 It means along Figure 1 A cross-sectional view of line BB. Figure 4 It means along Figure 1 A cross-sectional view of line CC. (See attached image.) Figures 1-4 As shown, the vibration structure 1 includes a vibrating mass block 10, a support portion 20, and an elastic portion 30. The vibrating mass block 10 is a plate-shaped portion having a front face 11 as a first face and a back face 12 as a second face, which are opposite to each other. The support portion 20 is a portion having a space 21 capable of accommodating the vibrating mass block 10. The elastic portion 30 is a portion capable of elastic deformation that connects the vibrating mass block 10 to the support portion 20. The elastic portion 30 extends along the outer periphery 13 of the vibrating mass block 10, and vibrates the vibrating mass block 10 relative to the support portion 20 in the direction facing the front face 11 and the back face 12 of the vibrating mass block 10. The vibrating mass block 10 has a plurality of corner portions 14 at its outer periphery 13. The width W of the plurality of portions 31 of the elastic portion 30 located at the plurality of corner portions 14 of the vibrating mass block 10 is wider than the width w of the other portions 32 and 33 of the elastic portion 30. The widths W and w are the distances in the directions of extension of the front face 11 and the back face 12. The composition of the vibration structure 1 is explained in detail below.
[0032] Below, as Figure 1As shown, for ease of explanation, the direction facing the front 11, which is the first surface of the vibrating mass block 10, is designated as the front side, and the direction facing the back 12, which is the second surface of the vibrating mass block 10, is designated as the back side. It should be noted that the front and back sides do not limit the posture of the vibrating structure 1 in its usage state. Furthermore, in the accompanying drawings, for multiple constituent elements, there are cases where not all of them are labeled, but only a portion of the symbols for multiple constituent elements are omitted.
[0033] like Figure 1 , 2 As shown, the vibrating mass 10 has a rectangular or approximately rectangular outer periphery 13. It should be noted that the outer periphery 13 is an annular surface facing outwards. Therefore, the outer periphery 13 of the vibrating mass 10 has four corners 14 and four sides 15. As an example, as... Figure 1 , 2 As shown, the outer periphery 13 of the vibrating mass block 10, viewed from the front and back sides, is rectangular or substantially rectangular in shape, and has a pair of sides 15a and a pair of sides 15b as sides 15. Additionally, the corners 14, viewed from the front and back sides, are depicted as curves such as arcs or radii. It should be noted that the shape of the corners 14 is not limited to this. For example, the corners 14, viewed from the front and back sides, could also be points. The vibrating mass block 10, as described above, is a plate-shaped component; for example, the width between the front 11 and the back 12 is constant or substantially constant.
[0034] like Figures 1-4 As shown, the support portion 20 is, for example, a plate-shaped component, with an internal space 21 capable of accommodating the vibrating mass block 10. Specifically, the support portion 20 has an annular edge facing its inner periphery, namely an inner periphery 22, and the space enclosed by the inner periphery 22 is the space 21. The space 21 of the support portion 20 is larger than the vibrating mass block 10. When the vibrating mass block 10 is accommodated in the space 21 of the support portion 20, an annular gap is formed between the outer periphery 13 of the vibrating mass block 10 and the inner periphery 22 of the support portion 20. The inner periphery 22 of the support portion 20 corresponds to the shape of the elastic portion 30, for example, it is rectangular or approximately rectangular, and has corner portions 23 corresponding to the four corner portions 14 of the vibrating mass block 10, and also has side portions 24 corresponding to the four sides 15 of the vibrating mass block 10.
[0035] As an example, such as Figure 1As shown, the inner periphery 22 of the support portion 20, viewed from the front and rear sides, is rectangular or substantially rectangular in shape, and the inner periphery 22 has a pair of sides 24a and a pair of sides 24b. Each side 24a is connected to an adjacent side 24b via a corner 23. The sides 24a of the support portion 20 extend, for example, parallel or substantially parallel to the sides 15a of the vibrating mass block 10, and the sides 24b of the support portion 20 extend, for example, parallel or substantially parallel to the sides 15b of the vibrating mass block 10. Furthermore, as... Figure 1 , 2 As shown, the corner 23, when viewed from the front and back sides, is depicted as a curve such as an arc or circle. It should be noted that the shape of the corner 23 is not limited to this. For example, the corner 23, when viewed from the front and back sides, can also be a point.
[0036] like Figure 1 As shown, the annular gap between the outer periphery 13 of the vibrating mass block 10 housed in the space 21 of the support portion 20 and the inner periphery 22 of the support portion 20 has a constant or substantially constant width between the portion of edge 15a and the portion of edge 24a facing edge 15a, and a constant or substantially constant width between the portion of edge 15b and the portion of edge 24b facing edge 15b. On the other hand, the annular gap between the outer periphery 13 of the vibrating mass block 10 housed in the space 21 of the support portion 20 and the inner periphery 22 of the support portion 20 does not have a constant width at the corner 14 and the portion of the inner periphery 22 of the support portion 20 facing corner 14. In addition, it is larger than the width of the gap between the portion of edge 15a and the portion of edge 24a facing edge 15a, and larger than the width of the gap between the portion of edge 15b and the portion of edge 24b facing edge 15b. It should be noted that the portion of the inner periphery 22 of the support portion 20 facing the corner portion 14 includes the portion of the edge 24a of the support portion 20 facing the corner portion 14 in the direction facing the corner portion 14, the corner portion 23 of the support portion 20, and the portion of the edge 24b of the support portion 20 facing the corner portion 14 in the direction facing the corner portion 14. The direction facing the corner portion 14 is, for example, the direction orthogonal to the surface formed by the corner portion 14 at each position of the corner portion 14.
[0037] The elastic portion 30 extends in the annular gap between the outer periphery 13 of the vibrating mass 10 housed in the space 21 of the support portion 20 and the inner periphery 22 of the support portion 20, and connects the vibrating mass 10 to the support portion 20 in a manner that allows the vibrating mass 10 to vibrate towards both the front and back sides. Figure 3 , 4 As shown, the elastic part 30 has a groove-shaped form that bends in a manner that protrudes towards the front side.
[0038] like Figure 1 , 2As shown, the four portions 31 of the elastic portion 30 located at the corner 14 of the vibrating mass block 10, i.e., the corner portions 31, are portions of the elastic portion 30 located between the corner 14 of the vibrating mass block 10 and the portion of the inner periphery 22 of the support portion 20 facing the corner 14. It should be noted that... Figure 2 The enlarged view shows one corner 31 of the elastic part 30. For example... Figure 1 , 2 As shown, the width W of the corner 31 of the elastic part 30 is wider than the width w of the other parts 32 and 33 of the elastic part 30. Figure 1 , 2 As shown, the other portions 32 and 33 of the elastic portion 30 are portions of the elastic portion 30 extending along the edges 15a and 15b of the vibrating mass block 10, namely, the edges 32 and 33. Furthermore, the widths W and w of the elastic portion 30 are, for example, widths in a direction orthogonal to the extending direction of the elastic portion 30 extending in a ring shape. It should be noted that in Figure 1 , 2 In the middle, the double-dotted lines 31b and 31c represent the ends of the corner 31.
[0039] like Figure 1 , 2 As shown, the width W of the corner 31 of the elastic part 30 is, for example, the maximum width W1 at the central part 31a of the corner 31. Furthermore, as... Figure 1 , 2 As shown, the width W of the corner portion 31 of the elastic portion 30 gradually increases from the end portion 31b toward the central portion 31a, and also gradually increases from the end portion 31c toward the central portion 31a. It should be noted that, as... Figure 2 As shown, the central portion 31a of the corner 31 is, for example, the portion located at the center or approximately the center of the corner 31 in the extending direction of the elastic portion 30, and is the portion located at the center or approximately the center between the end portion 31b and the end portion 31c. The width w of the edge portion 32 of the elastic portion 30 is, for example, generally constant or approximately constant. Additionally, the width w of the edge portion 33 of the elastic portion 30 is, for example, generally constant or approximately constant. The widths of the edge portion 32 and the edge portion 33 are, for example, the same or approximately the same. The width W1 of the central portion 31a of the corner 31 is, for example, more than twice the width w of the edges 32 and 33. It should be noted that the widths of the edge portion 32 and the edge portion 33 may also be different.
[0040] As described above, as an example, the width W of the corner portion 31 gradually increases from the end portion 31b toward the central portion 31a, and also gradually increases from the end portion 31c toward the central portion 31a, but the shape of the corner portion 31 is not limited to this. For example, the width W of the corner portion 31 may widen from the end portions 31b and 31c toward the central portion 31a respectively, but it may also be constant in a certain part. In addition, the portion of the corner portion 31 where the width W is the maximum width W1 may also have a predetermined width in the extending direction of the elastic portion 30. For example, the width W of the corner portion 31 may be the maximum width W1 in a portion within a predetermined range in the extending direction of the elastic portion 30, including the central portion 31a of the corner portion 31.
[0041] Figure 4 This shows a cross-section of the corner portion 31, which is orthogonal to the extending direction of the elastic portion 30. The corner portion 31 is, for example, as shown below. Figure 4 As shown, it becomes a groove-like shape that curves in a manner protruding towards the front side. The cross-sectional shape of the corner portion 31 is, for example, arc-shaped. The corner portion 31 has, for example, side portions 31d and 31e and a bottom portion 31f. Side portions 31d and 31e face each other via the bottom portion 31f, with side portion 31d connected to one end of the bottom portion 31f and side portion 31e connected to the other end of the bottom portion 31f. Figure 4 As shown, the cross-sectional shape of side portion 31d is an arc-shaped shape convex towards the front side, for example, a circular arc shape. Figure 4 As shown, the cross-sectional shape of the side portion 31e is an arc-shaped form convex towards the front, for example, a circular arc shape. Additionally, the cross-sectional shape of the bottom portion 31f is along a straight line. Figure 1 , 2 As shown, the width of the bottom 31f of the corner portion 31 gradually increases from the ends 31b and 31c toward the central portion 31a. The height of the corner portion 31 is constant or approximately constant. It should be noted that the height of the corner portion 31 is the width of the corner portion 31 in a direction orthogonal to the front end 11 or the back end 12.
[0042] Figure 3 This represents a cross-section of edge 32. For example... Figure 3 As shown, edge 32 has a U-shaped groove that curves towards the front side. The cross-sectional shape of edge 32 is, for example, arc-shaped or substantially arc-shaped. Edge 33 has the same or substantially the same shape as edge 32, having a U-shaped groove that curves towards the front side. The cross-sectional shape of edge 33 is, for example, arc-shaped or substantially arc-shaped. The height of edge 32 is constant or substantially constant. Similarly, the height of edge 33 is constant or substantially constant. It should be noted that the height of edges 32 and 33 is the width of edges 32 and 33 in a direction orthogonal to the front 11 or back 12.
[0043] In the elastic portion 30, the corner portion 31 and the edge portion 32 are smoothly connected without any height difference, and similarly, the corner portion 31 and the edge portion 33 are smoothly connected without any height difference. Therefore, the height of the corner portion 31 and the height of the edge portion 32 are the same or approximately the same, and the height of the corner portion 31 and the height of the edge portion 33 are the same or approximately the same.
[0044] like Figure 3 , 4 As shown, the thickness (thickness t) of the elastic portion 30 is constant or substantially constant over the entire elastic portion 30. That is, the thickness t of the corner portion 31, the edge portion 32, and the edge portion 33 is the same or substantially the same. It should be noted that, as Figure 3 , 4 As shown, the thickness t of the elastic part 30 is the distance between the front-facing side and the back-facing side of the elastic part 30.
[0045] The vibrating mass 10, the elastic part 30, and the support part 20 are integrally formed. That is, the vibrating structure 1 is integrally formed from a specific material, and the vibrating mass 10, the elastic part 30, and the support part 20 are the various parts of the vibrating structure 1 and are integrally connected. The material of the vibrating structure 1 is, for example, metal or resin. The resin of the vibrating structure 1 is, for example, a synthetic resin with excellent sound absorption properties such as polypropylene or nylon. In addition, the material of the vibrating structure 1 is, for example, an elastic material. The elastic material of the vibrating structure 1 is, for example, an elastomer, specifically, for example, rubber. Rubber used as the elastic material of the vibrating structure 1 includes, for example, silicone rubber, polyurethane rubber, ethylene propylene rubber, butyl rubber, EPDM rubber, nitrile rubber, etc. It should be noted that the elastic material of the vibrating structure 1 is not limited to rubber.
[0046] Next, the function of the vibration structure 1 with the above-described configuration will be explained.
[0047] Since the vibrating mass 10 is supported by the support portion 20 via the elastic portion 30, the vibrating mass 10 can vibrate relative to the support portion 20. Specifically, the vibrating mass 10 can vibrate towards the front side and the back side. The vibrating mass 10 resonates at a specific frequency, at which point it functions as an inertial mass. Thus, the vibrating structure 1 constitutes a membrane vibration system having the vibrating mass 10 that performs membrane vibration. Through the vibration of the vibrating mass 10, the vibrating structure 1 can generate sound in a specified frequency band and can absorb sound in a specified frequency band. The resonant frequency of the vibrating mass 10 can be set to any frequency, for example, by using parameters such as the size or specific gravity of the vibrating mass 10, the elastic modulus or flexibility of the elastic portion 30.
[0048] Vibration of the vibrating mass 10 causes deformation of the elastic portion 30, generating stress within it. When the width of the corner 31 of the elastic portion 30 is the same as the width of the edges 32 and 33, and the cross-sectional shape of the corner 31 is the same as or approximately arc-shaped as the cross-sectional shape of the edges 32 and 33, stress concentration occurs at the corner 31, potentially leading to premature failure of the elastic portion 30. Furthermore, stress concentration indicates a high elastic modulus or low flexibility, increasing the spring constant of the elastic portion. In contrast, in the vibrating structure 1, the width W of the corner 31 of the elastic portion 30 is wider than the width w of the edges 32 and 33, and the elastic modulus or flexibility of the corner 31 is higher than or equal to that of the edges 32 and 33. The corner 31 is also softer than or equal to that of the edges 32 and 33. Therefore, stress concentration at the corner 31 is suppressed. As a result, the elastic part 30 becomes less prone to damage, and the vibration structure 1 becomes less prone to damage. In addition, it is possible to achieve low-frequency vibration of the vibrating mass block 10.
[0049] Thus, the vibration structure 1 according to the first embodiment of the present invention can suppress stress concentration in the elastic portion 30 that deforms with the vibration of the vibrating mass block 10.
[0050] Next, the vibration structure 2 according to the second embodiment of the present invention will be described. Figure 5 This is a cross-sectional perspective view showing the schematic configuration of the vibration structure 2 according to the second embodiment of the present invention. Figure 5 As shown, the vibration structure 2 differs from the vibration structure 1 in the composition of its vibrating mass block. Below, regarding the composition of vibration structure 2, descriptions of structures with the same composition or function as vibration structure 1 will be omitted; instead, descriptions of the different compositions will be provided.
[0051] like Figure 5 As shown, the vibrating mass block 16 of the vibrating structure 2 is a plate-shaped portion having a front face 16a as a first face and a back face 16b as a second face, which are opposite to each other. Furthermore, the vibrating mass block 16 has a first plate portion 17 and a second plate portion 18. The first plate portion 17 is a plate-shaped portion having one of the front face 16a and the back face 16b, and the second plate portion 18 is a plate-shaped portion having the other of the front face 16a and the back face 16b. The first plate portion 17 and the second plate portion 18 are fixed to each other. Additionally, the first plate portion 17, the elastic portion 30, and the support portion 20 are integrated. The first plate portion 17 is the vibrating mass block 10 of the aforementioned vibrating structure 1. That is, the first plate portion 17, the elastic portion 30, and the support portion 20 form the vibrating structure 1. Figure 5As shown, the first plate portion 17 has, for example, a front surface 16a of the vibrating mass block 16, and the second plate portion 18 has, for example, a back surface 16b of the vibrating mass block 16. That is, the front surface 11 of the first plate portion 17 becomes the front surface 16a of the vibrating mass block 16.
[0052] like Figure 5 As shown, the second plate portion 18 has the same shape as the first plate portion 17 and a front surface 18a with the same or substantially the same shape as the back surface 12 of the first plate portion 17. Additionally, the second plate portion 18 has a back surface 18b facing away from the front surface 18a. This back surface 18b becomes the back surface 16b of the vibrating mass block 16. The front surface 18a of the second plate portion 18 faces the back surface 12 of the first plate portion 17, and the front surface 18a of the second plate portion 18 and the back surface 12 of the first plate portion 17 are fixed to each other, as are the first plate portion 17 and the second plate portion 18. The back surface 12 of the first plate portion 17 and the front surface 18a of the second plate portion 18 are fixed to each other, for example, by adhesive bonding.
[0053] Vibration structure 2 works in the same way as vibration structure 1 described above, and achieves the same effect.
[0054] It should be noted that in the vibrating mass block 16 of the vibrating structure 2, the first plate portion 17 is located on the front side and the second plate portion 18 is located on the back side, but it is also possible that the first plate portion 17 is located on the back side and the second plate portion 18 is located on the front side. In this case, the front surface 18a of the second plate portion 18 becomes the front surface 16a of the vibrating mass block 16, and the back surface 12 of the first plate portion 17 becomes the back surface 16b of the vibrating mass block 16. In addition, the back surface 18b of the second plate portion 18 faces the front surface 11 of the first plate portion 17, and the back surface 18b of the second plate portion 18 and the front surface 11 of the first plate portion 17 are fixed to each other, and the first plate portion 17 and the second plate portion 18 are fixed to each other.
[0055] Next, a passive radiator according to an embodiment of the present invention having vibration structure 1 or vibration structure 2 will be described.
[0056] Vibrating structure 1 or vibrating structure 2 can be used as a passive radiator. For example, such as Figure 6 As shown, by mounting a vibration structure 2 on the housing 50 of a loudspeaker (not shown), the vibration structure 2 becomes a passive radiator 2. In this case, the support portion 20 can also be fixed to the housing 50, or the support portion 20 can be formed as a part of the housing 50. It should be noted that, similarly, by mounting a vibration structure 1 on the housing 50 of a loudspeaker (not shown), the vibration structure 1 becomes a passive radiator 1.
[0057] When the speaker (not shown) is vibrated, sound waves with reversed phase (sound pressure) are emitted from the front of the speaker and simultaneously from the back of the speaker. The pressure fluctuations of the sound pressure behind the speaker cause the vibrating mass block 16 of the passive radiator 2 to vibrate, amplifying and reinforcing the sound. The passive radiator 1 using the vibrating structure 1 also functions in the same way.
[0058] For example, by appropriately setting the weight of the vibrating mass block 16 of the vibrating structure 2, which serves as the passive radiator 2, the spring constant of the elastic part 30, and the spring constant of the air spring formed in the internal space of the housing 50, it is possible to amplify and reinforce low-frequency sounds that are difficult for the speaker unit to emit at high volumes. The passive radiator 1 using the vibrating structure 1 also works in the same way.
[0059] The vibrating mass block 16 of the vibrating structure 2 is rectangular, which is more space-efficient compared to vibrating mass blocks with circular or elongated elliptical shapes. For example, a larger vibrating mass block can be made in the same rectangular space. Therefore, the vibrating structure 2 can be applied to slender speaker systems such as soundbars. The same applies to the passive radiator 1 that uses the vibrating structure 1.
[0060] Thus, the vibration structures 1 and 2 involved in the embodiments of the present invention can provide passive radiators with good space efficiency and resistance to damage.
[0061] Next, the sound-absorbing structure 3 according to the embodiment of the present invention, which includes the vibration structure 1, will be described. Figure 7 This is a three-dimensional diagram showing a portion of the sound-absorbing structure 3. Figure 8 It means along Figure 7 A cross-sectional view of line DD.
[0062] like Figure 7 As shown, the sound-absorbing structure 3 has a resonator 40. In Figure 7 Only one resonator 40 is shown, but the sound-absorbing structure 3 has a specified number of resonators 40, and the multiple resonators 40 are arranged in a specified shape.
[0063] like Figure 7 , 8As shown, the sound-absorbing structure 3 has a base 41 as a plate-shaped component and a box-shaped component 42 fixed to the base 41. The box-shaped component 42 has a trapezoidal shape in side view, and has an opening 43 on the rear side, making the rear side open. Additionally, the box-shaped component 42 has a rectangular plate-frame-like top surface 44 on the front side, and a vibration structure 1 is provided on the top surface 44. The front face 11 of the vibrating mass block 10 of the vibration structure 1 faces the front side. The support portion 20 of the vibration structure 1 is formed by the top surface 44. It should be noted that the top surface 44 and the support portion 20 can also be formed separately; in this case, the support portion 20 is fixed to the top surface 44. A connecting portion 45 extends from the end of the rear side of the box-shaped component 42, and multiple box-shaped components 42 are connected to each other via the connecting portion 45. The connecting portion 45 is a plate-shaped component with an opening 43, and has a surface 45a facing the rear side. The surface 45a extends along a plane.
[0064] like Figure 8 As shown, the box portion 42 has an internal space with the same or approximately the same shape as the box portion 42. The connecting portion 45 is fixed to the base 41, the back side of the box portion 42 is fixed to the base 41, the opening 43 of the box portion 42 is closed by the base 41, and the base 41 and the box portion 42 form a cavity 46 enclosed within the box portion 42, and a resonator 40 is formed therein. It should be noted that the multiple resonators 40 may not all be the same size. That is, the volume and height of the cavity 46 of the multiple resonators 40 may not all be the same.
[0065] The sound-absorbing structure 3 has the above-described configuration, and the vibrating mass block 10 of the vibrating structure 1 vibrates its diaphragm due to sound pressure received from the front side. Furthermore, the air within the cavity 46 functions as an air spring. Therefore, each resonator 40 absorbs sound in the frequency band corresponding to its frequency band from the sound source incident from the sound source through the diaphragm vibration of the vibrating mass block 10 and the air spring within the cavity 46.
[0066] Like the housing 42, when its shape is rectangular when viewed from the front side, multiple housings 42 can be densely arranged on the base 41, and multiple resonators 40 can be densely arranged. Furthermore, since the vibrating mass block 10 that performs diaphragm vibration is rectangular, the area of the vibrating mass block 10 can be increased in the housing 42, and the area of the top surface 44, which does not have sound absorption function, can be reduced. Therefore, the vibration structure 1 can increase the area of the vibrating mass block 10 in the resonator 40 that has sound absorption function based on diaphragm vibration, and can improve the sound absorption effect of the resonator 40. In addition, the settable range of the area of the vibrating mass block 10 in the resonator 40 can be expanded, and the degree of freedom in setting the sound absorption frequency band of the resonator 40 can be increased. Furthermore, the degree of freedom in the shape of the resonator 40 can be increased.
[0067] Furthermore, as described above, in the vibrating structure 1, the width W of the corner 31 of the elastic part 30 is wider than the width w of the sides 32 and 33 of the elastic part 30, thus increasing the flexibility of the corner 31 and making it softer. Therefore, stress concentration at the corner 31 is suppressed. Consequently, the elastic part 30 is less prone to breakage, and the vibrating structure 1 is less prone to breakage. Therefore, the elastic part 30 can suppress breakage while simultaneously improving the sound absorption effect by making the shape of the vibrating mass block 10 rectangular.
[0068] Furthermore, as described above, the flexibility of the corner 31 of the elastic part 30 is increased, thereby reducing the spring constant of the elastic part 30. Therefore, even when absorbing low-frequency sounds, it is not necessary to enlarge the enclosure 42. If the spring constant of the elastic part 30 is high, the diaphragm vibration of the vibrating mass block 10 will be a high-frequency vibration. In this case, for example, if the sound absorption target of the resonator 10 is a low-frequency sound less than 1 kHz, it is necessary to enlarge the enclosure 42 to reduce the spring constant of the resonator 40. In this case, the sound-absorbing structure 3 becomes large, and when a large sound-absorbing structure 3 is placed in a limited space such as a narrow office, it creates a feeling of oppression for the user of the space. In contrast, as described above, the sound-absorbing structure 3 can be kept from becoming too large. Therefore, even when the sound-absorbing structure 2 is placed in a limited space such as a narrow office, it is possible to suppress the feeling of oppression for the user of the space.
[0069] It should be noted that, like the vibration structure 1, the vibration structure 2 can also be used in the sound-absorbing structure 3. Furthermore, the vibration structure 1 according to the embodiments of the present invention can also be applied to a rectangular loudspeaker.
[0070] The present invention has been described above through the above embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. Those skilled in the art will obviously be able to make various changes or improvements to the above embodiments. It is evident from the claims that such changes or improvements can also be included within the technical scope of the present invention.
[0071] The embodiments described above are intended to facilitate understanding of the present invention and are not intended to limit or explain the invention. Furthermore, the above embodiments do not limit the scope of application of the present invention; the present invention can encompass all objects that can be utilized therein. The constituent elements, their arrangement, materials, conditions, shapes, and dimensions, etc., provided in the above embodiments are not limited to the examples shown and can be appropriately modified. For example, the present invention includes differences arising during implementation, such as manufacturing tolerances. Furthermore, within the scope of technical non-contradiction, the constituent elements shown in different embodiments can be partially substituted or combined with each other. Additionally, the various components can be appropriately and selectively combined to ensure that at least a portion of the aforementioned problems and effects are achieved.
Claims
1. A vibrating structure, comprising: A vibrating mass block, the vibrating mass block being a plate-shaped portion having a first surface and a second surface as a pair of opposing faces; The support portion, which is a part having a space capable of accommodating the vibrating mass block; and The elastic part is the portion that connects the vibrating mass block to the support part and is capable of elastic deformation. The elastic portion extends along the outer periphery of the vibrating mass block, providing vibratory support for the vibrating mass block relative to the supporting portion in the directions facing the first and second surfaces of the vibrating mass block. The vibrating mass block has multiple corners on its outer periphery. The width of several portions of the elastic portion located at the various corners of the vibrating mass block is wider than the width of the other portions of the elastic portion. The width is the distance in the direction of the expansion of the surface.
2. The vibration structure according to claim 1, wherein, The shape of the cross section orthogonal to the extension direction of the elastic part is an arc shape protruding in the direction facing the first surface.
3. The vibration structure according to claim 1, wherein, The width of each of the plurality of portions of the elastic part is maximized at the center of the portion.
4. The vibration structure according to claim 3, wherein, The maximum width of the plurality of portions is more than twice the width of the other portions of the elastic portion.
5. The vibration mechanism according to claim 3, wherein, The width of each of the plurality of portions of the elastic part increases from both ends toward the center.
6. The vibration structure according to claim 1, wherein, The width of the other portions of the elastic part is constant.
7. The vibration structure according to claim 1, wherein, The plurality of portions of the elastic part are of the same shape as each other.
8. The vibration structure according to claim 1, wherein, The first and second faces of the vibrating mass block are rectangular in shape. The vibrating mass block has four corners. The elastic part has four of the aforementioned portions.
9. A passive radiator comprising the vibration structure of claim 1.
10. The passive radiator according to claim 9, wherein, The vibrating mass block has: a first plate portion, which is a plate-shaped portion having one of the first surface and the second surface; and a second plate portion, which is a plate-shaped portion having the other of the first surface and the second surface. The first plate portion and the second plate portion are fixed to each other. The first plate portion, the elastic portion, and the support portion are integrated into one unit.
11. A sound-absorbing structure having the vibration structure described in claim 1.
12. The sound-absorbing structure according to claim 11, wherein, The vibrating mass block, the elastic part, and the support part are integrated into one unit.