Acoustic device and sound production apparatus

Abstract

An acoustic device (3) is provided with a piezoelectric element and a frame (30). The frame (30) has a main body portion (31) and a rib portion (35). The main body portion (31) includes a vibration portion (32) and a plurality of support portions (33). The rib portion (35) is connected to the main body portion (31). The rib portion (35) extends in a third direction that intersects the second direction, between a pair of the support portions (34a, 34b) that face each other and are separated from each other in the third direction, as viewed in the second direction along the vibration surface. A hollow region (V) is demarcated by the vibration portion (32) and the plurality of support portions (33). An opening (S1) is demarcated by the rib portion (35) and the main body portion (31), and communicates with the hollow region (V). The rib portion (35) covers the center of the hollow region (V), as viewed in the second direction.

Description

Technical Field

[0001] This invention relates to audio devices and sound-producing apparatus. Background Technology

[0002] An audio device with a piezoelectric element is known. For example, in the audio device described in Patent Document 1, the piezoelectric element is disposed on the vibrating surface of a diaphragm. The vibrating surface vibrates by being driven by the piezoelectric element, and sound is emitted based on the vibration of the vibrating surface.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 04-070100 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] The aforementioned audio device functions as a sound-producing device such as a loudspeaker or buzzer by being mounted on a cover component. The cover component can be, for example, a window, a wall, or the frame of another functional device. For instance, a piezoelectric element is driven by an electrical signal corresponding to the sound source input. Driven by the piezoelectric element, the vibrating surface of the diaphragm mounted on the cover component vibrates. As a result, the audio device, when mounted on the cover component, emits a sound corresponding to the sound source. However, when the diaphragm is mounted on the cover component, the vibrating surface is constrained by the cover component, making it difficult to increase the sound pressure level.

[0008] A structure is being researched to suppress the constraint on the vibrating surface of an audio device when it is enclosed in a enclosure by reducing the area of ​​the vibrating surface in contact with matter other than the atmosphere. However, even suppressing the constraint on the vibrating surface alone may not be enough to increase the sound pressure level at the desired frequency. If the sound pressure level varies between different frequencies within the human audible range, the perceived loudness of the sound changes between different intervals. By adjusting the sound pressure level at each frequency, it is possible to produce a sound closer to the sound source. Therefore, a structure that allows for adjustment of the sound pressure level at the desired frequency band is sought.

[0009] One aspect of the present invention aims to provide an audio device that, when disposed within a cover member, can emit sound with an adjusted sound pressure level in a desired frequency band. Another aspect of the present invention aims to provide a sound-emitting device capable of emitting sound with an adjusted sound pressure level in a desired frequency band. A further aspect of the present invention aims to provide an audio device that, when disposed within a cover member, can emit sound with an adjusted sound pressure level in a desired frequency band.

[0010] Technical solutions for solving the problem

[0011] An audio device according to one aspect of the present invention includes a piezoelectric element and a frame. The piezoelectric element is disposed within the frame. The frame has a main body and ribs. The main body includes a vibrating portion and a plurality of support portions. The vibrating portion includes a vibrating surface on which the piezoelectric element is disposed. The plurality of support portions extend from the vibrating portion in a first direction intersecting the vibrating surface. The plurality of support portions are disposed along the edge of the vibrating portion. The ribs are connected to the main body. Viewed from a second direction along the vibrating surface, the ribs extend in a third direction between a pair of support portions that are opposite and separated from each other in a third direction. The third direction intersects the second direction. A hollow region and an opening are formed in the frame. The hollow region is defined by the vibrating portion and the plurality of support portions. The opening is defined by the ribs and the main body and communicates with the hollow region. Viewed from the second direction, the ribs cover the center of the hollow region.

[0012] In this audio device, viewed from a second direction, the ribs cover the center of a hollow region defined by the vibrating part and multiple supporting parts. According to this structure, when the audio device emits sound while mounted on the cover member, the sound pressure level at a desired frequency band is adjusted by the ribs. In other words, when the audio device is mounted on the cover member, it can emit sound with an adjusted sound pressure level at a desired frequency band.

[0013] In the aforementioned configuration, the opening defined by the rib and the main body can also extend through in the first direction. According to this structure, when the audio device emits sound while mounted on the cover component, the sound pressure level in the desired frequency band can be adjusted via the rib, while simultaneously increasing the overall sound pressure level across the entire frequency band.

[0014] In the aforementioned embodiment, each support portion may also include a first edge and a second edge. The first edge may extend along and connect with the vibrating portion. The second edge may also be located on the opposite side of the first edge in the first direction. Viewed from the second direction, the second edge of each support portion may also be further away from the vibrating surface than the rib in the first direction. According to this structure, when the audio device is mounted on the cover member, an opening communicating with the hollow region can be formed between the cover member and the rib. Therefore, when the audio device emits sound while mounted on the cover member, the sound pressure level in the desired frequency band can be adjusted through the rib, while further increasing the sound pressure level of the overall frequency band.

[0015] In the aforementioned configuration, the rib may also have a pair of ends and a central portion. The pair of ends may also be connected to the main body. The central portion may also be connected to the pair of ends and separated from the main body. The central portion may also have a curved surface. The curved surface may also be curved in a manner facing the piezoelectric element and moving away from the piezoelectric element in a second direction. According to this structure, when the audio device emits sound while mounted on the cover member, the sound pressure level in the desired frequency band can be adjusted more appropriately by means of the rib.

[0016] In one of the above methods, the curved surface can also be continuously connected to the pair of ends. The curved surface can also be bent such that the further away from the pair of ends the piezoelectric element the more it is. According to this structure, when the audio device emits sound while mounted on the enclosure, the sound pressure level in the desired frequency band can be more appropriately adjusted via the ribs.

[0017] In the aforementioned configuration, the central portion may also include multiple curved surfaces. The central portion may also have a protrusion. Viewed from the first direction, the protrusion may also protrude towards the vibrating portion from a position where it is held between adjacent curved surfaces. According to this structure, when the audio device emits sound while mounted on the enclosure member, the sound pressure level in the desired frequency band can be more appropriately suppressed by the ribs.

[0018] In the aforementioned configuration, the frame may also have multiple ribs. These multiple ribs may also be connected to the main body at different locations. Viewed from a second direction corresponding to each rib, the multiple ribs may also cover the center of the hollow region. According to this structure, the frame has multiple ribs, each covering the center of the hollow region when viewed from the second direction. According to this structure, when the audio device emits sound while mounted in the enclosure, the sound pressure level in the desired frequency band can be more appropriately adjusted via the ribs. The overall sound pressure level across the entire frequency band can be further improved.

[0019] Another embodiment of the sound-producing device of the present invention includes the aforementioned acoustic device and cover component. The cover component has a mounting surface facing the vibrating surface and connected to a plurality of support portions.

[0020] In this sound-producing device, viewed from a second direction, the ribs cover the center of a hollow region defined by the vibrating part and multiple supporting parts. Based on this structure, the sound pressure level at a desired frequency band can be adjusted via the ribs. Therefore, this sound-producing device is capable of emitting sound with an adjusted sound pressure level at the desired frequency band.

[0021] In another embodiment described above, an opening may also be formed. When viewed from a second direction, this opening may be defined by a cover component, a pair of supports, and ribs. In this case, an opening is formed between the cover component and the ribs, thus allowing adjustment of the sound pressure level in the desired frequency band via the ribs, while further increasing the overall sound pressure level across the entire frequency band.

[0022] Another aspect of the present invention provides an audio device comprising a piezoelectric element and a frame in which the piezoelectric element is disposed. The frame has a main body and ribs. The main body includes a vibrating part and a supporting part. The vibrating part includes a vibrating surface in which the piezoelectric element is disposed. The supporting part extends from the vibrating part in a first direction intersecting the vibrating surface. The ribs are connected to the main body. Viewed from a second direction along the vibrating surface, the ribs extend in a third direction intersecting the second direction. A hollow region and an opening are formed in the frame. The hollow region is defined by the vibrating part and the supporting part. The opening is defined by the ribs and the main body and communicates with the hollow region. Viewed from the second direction, the ribs cover the center of the hollow region.

[0023] In this audio device, viewed from a second direction, the rib covers the center of the hollow region defined by the vibrating part and the supporting part. According to this structure, when the audio device emits sound while mounted on the cover member, the sound pressure level at a desired frequency band is adjusted by the rib. In other words, when the audio device is mounted on the cover member, it can emit sound with an adjusted sound pressure level at a desired frequency band.

[0024] Invention Effects

[0025] One aspect of the present invention provides an audio device that, when disposed within a cover member, can emit sound with an adjusted sound pressure level in a desired frequency band. Another aspect of the present invention provides a sound-emitting device capable of emitting sound with an adjusted sound pressure level in a desired frequency band. Yet another aspect of the present invention provides an audio device that, when disposed within a cover member, can emit sound with an adjusted sound pressure level in a desired frequency band. Attached Figure Description

[0026] Figure 1 This is a perspective view of the sound-producing device of this embodiment.

[0027] Figure 2 This is a top view of an audio device.

[0028] Figure 3 It is a 3D diagram of an audio device.

[0029] Figure 4 This is the front view of the sound-producing device.

[0030] Figure 5 This is a side view of the sound-producing device.

[0031] Figure 6 This is a top view of a modified audio device according to this embodiment.

[0032] Figure 7 This is a perspective view of an audio device according to a modified embodiment of this invention.

[0033] Figure 8This is a front view of an audio device in another variation of this embodiment.

[0034] Figure 9 This is a perspective view of the rib of an audio device in another variation of this embodiment.

[0035] Figure 10 This is a top view of an audio device, another variation of this embodiment.

[0036] Figure 11 This is a side view of an audio device, which is another variation of this embodiment.

[0037] Figure 12 It is a graph showing the sound pressure level at each frequency in a sound-producing device. Detailed Implementation

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are referred to by the same reference numerals, and repeated descriptions are omitted.

[0039] Reference Figures 1-5 The structure of the sound-producing device and the audio components included in the sound-producing device of this embodiment will be described. The sound-producing device 1 functions as a loudspeaker, for example. Figure 1 It is a three-dimensional diagram of the sound-producing device. Figure 1 In this diagram, the XYZ axes represent the coordinate axes of the audio device. The X-axis, Y-axis, and Z-axis are orthogonal to each other.

[0040] The sound-producing device 1 includes a cover component 2 and an audio device 3. The cover component 2 has a mounting surface 2a for mounting the audio device 3. The cover component 2 is, for example, a plate-shaped component. The cover component 2 can be integrally formed with the audio device 3 or can be separately formed from the audio device 3. The cover component 2 can also be, for example, a window, a wall, or a frame of a device with a different function from the audio device 3. The audio device 3 operates when it is mounted on the mounting surface 2a of the cover component 2.

[0041] Figure 2 This is a top view of an audio device. Figure 3 It is a 3D diagram of an audio device. Figure 4 This is the front view of the sound-producing device 1. Figure 5 This is a side view of an audio device. Figures 2-5 In the diagram, the XYZ axes represent the coordinate axes of the audio device. The audio device 3 includes a piezoelectric element 10, a wiring component 20, and a housing 30. The piezoelectric element 10 is housed in the housing 30 and operates by being powered from the wiring component 20. As a variation of this embodiment, the audio device 3 may also have a structure that does not include the wiring component 20 but installs the wiring component when the audio device 3 operates.

[0042] The piezoelectric element 10 has a piezoelectric core 10a and a pair of external electrodes (not shown). The piezoelectric core 10a is composed of multiple piezoelectric layers (not shown) stacked together. Each piezoelectric layer is made of a piezoelectric material. For example, each piezoelectric layer is made of a piezoelectric ceramic material. Examples of piezoelectric ceramic materials used include PZT [Pb(Zr,Ti)O3], PT (PbTiO3), PLZT [(Pb,La)(Zr,Ti)O3], or barium titanate (BaTiO3). Each piezoelectric layer is, for example, a sintered body of a ceramic green sheet containing the above-mentioned piezoelectric ceramic material. In the actual piezoelectric core 10a, each piezoelectric layer is integrated to the point that the boundaries between the piezoelectric layers are indistinguishable. Multiple internal electrodes (not shown) are disposed within the piezoelectric core 10a. Each internal electrode is made of a conductive material. Examples of conductive materials used include Ag, Pd, or Ag-Pd alloys.

[0043] Wiring component 20 is, for example, a flexible printed circuit (FPC). Wiring component 20 is electrically connected to each of the external electrodes of piezoelectric element 10. Wiring component 20 has one end that is electrically and physically connected to piezoelectric element 10, and another end that is electrically and physically connected to electronic device (not shown) equipped with audio device 3.

[0044] A piezoelectric element 10 is housed between the frame 30 and the cover component 2. The frame 30 has a main body 31 and a rib 35. The piezoelectric element 10 is disposed on the main body 31. The rib 35 is connected to the main body 31. The frame 30 has an opening S1. The opening S1 is defined by the edge of the main body 31 and the edge of the rib 35. Figure 2 As shown, the opening S1 passes through the audio device 3 in the Z-axis direction. The main body 31 has a vibrating part 32 and a supporting part 33. The materials constituting the frame 30 include, for example, a synthetic material of polycarbonate resin and ABS resin, ABS resin, polybutylene terephthalate resin, polyphenylene sulfide resin, and liquid crystal polymer resin.

[0045] The vibrating section 32 functions as a vibrating plate that vibrates according to the displacement of the piezoelectric element 10. The vibrating section 32 is flat and has a pair of main surfaces α and β. For example, the main surfaces α and β are planar. The main surfaces α and β are located on opposite sides of each other. Each main surface α and β is orthogonal to the Z-axis direction. Each main surface α and β is along the X-axis and Y-axis directions. For example, each main surface α and β is parallel to the X-axis and Y-axis directions. The main surface β is opposite the mounting surface 2a of the cover member 2 in the Z-axis direction. The piezoelectric element 10 is disposed on the main surface β, for example, by an adhesive or double-sided tape. Viewed from a direction orthogonal to the main surface β, the piezoelectric element 10 is, for example, disposed at the center of the main surface β. The main surface β is a vibrating surface that vibrates according to the movement of the piezoelectric element 10. For example, the piezoelectric element 10 is disposed on the main surface β, causing the main surface β to vibrate during movement.

[0046] The vibrating part 32 includes edges 32a, 32b, 32c, and 32d that define the principal surface β. For example, the vibrating part 32 is rectangular and is defined by edges 32a, 32b, 32c, and 32d when viewed from a direction orthogonal to the principal surface β. The principal surface β is a rectangular plane. Edges 32a and 32c are located on opposite sides of each other in the X-axis direction. Edges 32b and 32d are located on opposite sides of each other in the Y-axis direction.

[0047] Support portion 33 supports vibration portion 32. Support portion 33 extends along and is connected to the main surface β of vibration portion 32. Support portion 33 is disposed along edges 32b, 32c, and 32d of vibration portion 32. For example, support portion 33 is connected to edges 32b, 32c, and 32d of vibration portion 32. As a variation of this embodiment, support portion 33 may also be disposed along the edge of vibration portion 32, separate from the edge of vibration portion 32. Support portion 33 extends from vibration portion 32 in a direction intersecting main surface β. For example, support portion 33 extends from main surface β in the Z-axis direction.

[0048] With the frame 30 mounted on the mounting surface 2a of the cover member 2, the support portion 33 extends from the main surface β toward the mounting surface 2a of the cover member 2. The support portion 33 supports the vibrating part 32 in a manner that separates the main surface β of the cover member 2 and the vibrating part 32. The support portion 33 is connected to the mounting surface 2a of the cover member 2.

[0049] A hollow region V, defined by the vibrating part 32 and the supporting part 33, is formed on the frame 30. In other words, the hollow region V is a space surrounded by the vibrating part 32 and the supporting part 33. With the frame 30 mounted on the mounting surface 2a of the cover member 2, the hollow region V is defined by the mounting surface 2a, the vibrating part 32, and the supporting part 33. The piezoelectric element 10 is housed in the hollow region V. The hollow region V communicates with the opening S1.

[0050] The wiring component 20 extends outward from the hollow region V through the space between the cover component 2 and the support portion 33. As a variation of this embodiment, a buffer component may also be provided between the support portion 33 and the mounting surface 2a. In this case, the wiring component 20 may also extend outward from the hollow region V through the space between the buffer component and the support portion 33. Materials constituting the buffer component include, for example, rubber, polyurethane resin, and phenolic resin. Rubber includes foamed butyl rubber.

[0051] The support portion 33 includes multiple support portions 34a, 34b, and 34c. For example, the multiple support portions 34a, 34b, and 34c are connected to each other as a single unit. Support portions 34a and 34b are one end and the other end of the support portion 33, respectively. Each support portion 34a, 34b, and 34c is flat. Each support portion 34a, 34b, and 34c is rectangular in plan view and includes edges 33a, 33b, 33c, and 33d. Edges 33a and 33c are located on opposite sides of each other in the X-axis direction. Edges 33b and 33d are located on opposite sides of each other in the Z-axis direction. The lengths of edges 33b and 33d are greater than the lengths of edges 33a and 33c. Edges 33b and 33d of each support portion 34a, 34b, and 34c extend along the main surface β. For example, edges 33b and 33d are parallel to the main surface β. The edges 33a and 33c of each support portion 34a, 34b, and 34c extend in a direction intersecting the main surface β. The edge 33b of each support portion 34a, 34b, and 34c is connected to the main surface β of the vibrating portion 32. As a variation of this embodiment, the multiple support portions 34a, 34b, and 34c may also be separated from each other. In this variation, the support portion 33 may not include the support portion 34c.

[0052] Support portions 34a and 34b are opposite to each other in the Y-axis direction and are separate from each other. Support portions 34a and 34b are arranged such that they clamp the piezoelectric element 10 in the Y-axis direction when viewed from the X-axis direction. Support portion 34c is connected to a pair of support portions 34a and 34b. Edge 33a of support portion 34c is connected to edge 33c of support portion 34a, and edge 33c of support portion 34c is connected to edge 33c of support portion 34b. The piezoelectric element 10 is surrounded by a plurality of support portions 34a, 34b, and 34c. The piezoelectric element 10 is located between support portions 34a and 34b in the opposite direction of the pair of support portions 34a and 34b. For example, when viewed from the Y-axis direction, the piezoelectric element 10 is located between edges 33a and 33c of support portion 34a, and between edges 33a and 33c of support portion 34b.

[0053] For example, the edges 33b of the support portions 34a, 34b, and 34c are connected to the edges 32b, 32c, and 32d of the vibrating portion 32, respectively, and extend along the connecting edges 32b, 32c, and 32d. Multiple support portions 34a, 34b, and 34c extend from the edges 32b, 32c, and 32d of the vibrating portion 32 in a direction orthogonal to the main surface β. The edges 33a and 33c of each support portion 34a, 34b, and 34c extend along the Z-axis direction. The edges 33b and 33d of the support portion 34c extend along the Y-axis direction. The edges 33b and 33d of a pair of support portions 34a and 34b extend in a direction orthogonal to the Z-axis direction and intersecting the Y-axis direction. With the frame 30 mounted on the mounting surface 2a of the cover component 2, the hollow region V is defined by the mounting surface 2a, the vibrating portion 32, the support portions 34a, 34b, and 34c.

[0054] For example, the wiring component 20 extends from the hollow region V to the outside of the hollow region V, passing between the edge 32d of the support portion 34c and the mounting surface 2a. When the audio device 3 is mounted on the cover component 2, the wiring component 20 is in contact with the edge 32d of the support portion 34c.

[0055] An opening S2 is formed in the main body 31. The opening S2 is defined by the edge 32a of the vibrating part 32, the edge 33a of the support part 34a, and the edge 33a of the support part 34b. The opening S2 communicates with the hollow region V. For example, when viewed from the X-axis direction, the opening S2 is rectangular with the edge 32a of the vibrating part 32, the edge 33a of the support part 34a, and the edge 33a of the support part 34b as its three sides. When the frame 30 is mounted on the mounting surface 2a of the cover member 2, the opening S2 is defined by the mounting surface 2a, the edge 32a of the vibrating part 32, the edge 33a of the support part 34a, and the edge 33a of the support part 34b.

[0056] Rib 35 is connected to main body 31. For example, rib 35 is connected to the edge 33a of support 34a and the edge 33a of support 34b. Rib 35 extends in a direction opposite to the pair of support portions 34a and 34b. Rib 35 is elongated, with its long side extending along the Y-axis. Viewed from the X-axis direction, rib 35 extends along the Y-axis between the pair of support portions 34a and 34b.

[0057] Viewed from the X-axis, rib 35 at least covers the center of opening S2. In other words, viewed from the X-axis, rib 35 covers the center of hollow region V. "Center of the covered region" refers to at least the geometric center of the covered region. For example, the cross-sectional shape of rib 35 in the XY-axis plane is the same in the Z-axis direction. The width of rib 35 in the Z-axis direction is, for example, approximately 1 to 10 mm. Figure 1 In the structure shown, the width of rib 35 in the Z-axis direction is 5mm.

[0058] Rib 35 has a pair of ends 36, 37 and a central portion 38. The pair of ends 36, 37 are connected to the main body 31. The central portion 38 is connected to the pair of ends 36, 37. The central portion 38 is separate from the main body 31. For example, the pair of ends 36, 37 are connected to the main body 31 by adhesive or double-sided tape. As a variation of this embodiment, rib 35 may also be integrally formed with the main body 31. For example, end 36 of rib 35 is connected to edge 33a of support portion 34a. End 37 of rib 35 is connected to edge 33a of support portion 34b. As a variation of this embodiment, at least one of the pair of ends 36, 37 may also be connected to a portion other than edge 33a. For example, at least one of the pair of ends 36, 37 may also be connected to edge 32a of vibrating portion 32.

[0059] Figure 4 This is a diagram showing the sound-producing device 1 viewed from the X-axis direction. Figure 4 In this example, the piezoelectric element 10 and wiring components 20 are omitted. For example... Figure 4 As shown, viewed from the X-axis direction, the edges 33d of the support portions 34a, 34b, and 34c are further away from the main surface β of the vibrating portion 32 in the Z-axis direction than the rib 35. In other words, viewed from the X-axis direction, the support portions 34a, 34b, and 34c protrude from the rib 35 in the Z-axis direction. Therefore, an opening S3 is formed in the sound-producing device 1 on which the sound device 3 is mounted on the cover member 2. When viewed from the X-axis direction, the opening S3 is defined by the cover member 2, the pair of support portions 34a and 34b, and the rib 35. When the sound device 3 is mounted on the cover member 2, the central portion 38 of the rib 35 is separated from the vibrating portion 32.

[0060] The central portion 38 is rectangular and extends along the Y-axis from one end 36 or end 37 towards the other. The central portion 38 includes edges 38a and 38b extending along the Y-axis. Edges 38a and 38b are the longer sides of the central portion 38. Edges 38a and 38b are located on opposite sides of each other in the Z-axis direction. Edge 38a of the central portion 38, together with edge 32a of the vibrating portion 32, defines the opening S1. Viewed from the X-axis direction, the central portion 38 at least covers the center of the opening S2 and faces the piezoelectric element 10. Viewed from the X-axis direction, the central portion 38 is disposed between a pair of support portions 34a and 34b. In other words, the central portion 38 is disposed in a manner that overlaps with the hollow region V when viewed from the X-axis direction.

[0061] The central portion 38 has at least one curved surface 39. The curved surface 39 faces the piezoelectric element 10. The curved surface 39 is opposite the support portion 34c. The curved surface 39 is curved away from the piezoelectric element 10 in the X-axis direction. The curved surface 39 is also curved away from the main surface β in the X-axis direction when viewed from the Z-axis direction. Figure 2As shown, the curved surface 39 is curved into an arc shape, appearing convex in the X-axis direction when viewed from the Z-axis direction. The radius of curvature of the curved surface 39 is, for example, about 148 mm to 150 mm.

[0062] For example, the central portion 38 has a curved surface 39. The curved surface 39 is continuously connected to a pair of ends 36, 37. The curved surface 39 is curved in such a way that the farther away from the pair of ends 36, 37 is from the piezoelectric element 10 in the X-axis direction. The curved surface 39 is curved in such a way that the farther away from the pair of ends 36, 37 is from the main surface β in the X-axis direction when viewed from the Z-axis direction.

[0063] Next, refer to Figure 6 and Figure 7 The following describes a modified audio device according to the above-described embodiment. In this modified example, the audio device 3A differs from the audio device 3 of the above-described embodiment in that the shape of the audio device 3 and the rib are different, and the through-hole for the wiring component is formed in the main body. Hereinafter, the differences from the above-described embodiment will be mainly explained. Figure 6 This is a top view of the audio device 3A in this modified example. Figure 7 This is a perspective view of the audio device 3A in this modified example.

[0064] The audio device 3A has a frame 30A instead of a housing 30. The frame 30A has a main body 31A and a rib 35A. The main body 31A differs from the main body 31 in that it has a support portion 34c with a through opening 51. The wiring component 20 extends from the hollow region V to the outside of the hollow region V through the through opening 51.

[0065] Rib 35A differs from rib 35 in the following ways: The central portion 38 of rib 35A has multiple curved surfaces 39. For example... Figure 6 As shown, the central portion 38 has a protrusion 53 protruding from a position where it is held between adjacent curved surfaces 39. Viewed from the Z-axis direction, the protrusion 53 protrudes toward the vibrating portion 32 in the X-axis direction. The protrusion 53 extends along the Z-axis direction. The protrusion 53 is separate from the main body portion 31. The cross-sectional shape of the protrusion 53 in the XY-axis plane is the same in the Z-axis direction. The cross-sectional shape of the rib 35A in the XY-axis plane is the same in the Z-axis direction.

[0066] In this modified example, the central portion 38 has two curved surfaces 39. Each curved surface 39 is continuously connected to one of a pair of ends 36, 37 and the protrusion 53. As another modification of this modified example, the protrusion 53 may also be connected to the vibrating portion 32.

[0067] Next, refer to Figure 8 and Figure 9A further variation of the above-described embodiment of the audio device will be described. In this variation, the audio device 3B differs from the audio device 3 of the above-described embodiment in that the shapes of the audio device 3 and the rib are different. Hereinafter, the differences from the above-described embodiment will be mainly described. Figure 8 This is the front view of the audio device 3B in this modified example. Figure 9 This is a perspective view of the rib of the audio device 3B in this modified example.

[0068] The audio device 3B has a frame 30B instead of a frame 30. The frame 30B has a main body 31 and a rib 35B. Figure 8 This is a diagram of the audio device 3B viewed from the X-axis direction. Figure 8 In this version, the piezoelectric element 10 and wiring component 20 are omitted. Rib 35B differs from rib 35 in the following aspects.

[0069] The central portion 38 of rib 35B has at least one curved surface 39. The central portion 38 of rib 35B includes at least one dish-shaped portion 61. In this variation, the central portion 38 includes two dish-shaped portions 61, and also includes a saddle-shaped portion 62 connecting the two dish-shaped portions 61. The dish-shaped portion 61 is crescent-shaped and includes a convex surface 62a and a concave surface 62b. The convex surface 62a and the concave surface 62b are located on opposite sides of each other. The concave surface 62b includes the curved surface 39. Viewed from the X-axis direction, the edge of the dish-shaped portion 61 is separated from the edge of the hollow region V.

[0070] Next, refer to Figure 10 and Figure 11 A further variation of the above-described embodiment of the audio device will be described. In this variation, the audio device 3C differs from the audio device 3 of the above-described embodiment in that it has multiple ribs 35, 35C, and 35D. The differences from the above-described embodiment will be described below. Figure 10 This is a top view of the audio device 3C in this modified example. Figure 11 This is a side view of the audio device 3C in this modified example. The audio device 3C includes a frame 30C. The frame 30C differs from the frame 30 in the following aspects.

[0071] The frame 30C has a main body 31C, ribs 35, and ribs 35C and 35D. The main body 31C differs from the main body 31 in the structure of the support portions 34a and 34b. The support portions 34a and 34b of the main body 31C are column-shaped and extend in a direction intersecting the main surface β. Therefore, as... Figure 11 As shown, in the support portion 34b of the main body 31C, the lengths of edges 33b and 33d are less than the lengths of edges 33a and 33c. The same applies to the support portion 34a of the main body 31C. The support portions 34a and 34b of the main body 31C are separate from the support portion 34c.

[0072] In addition to opening S2, openings S4 and S5 are formed in the main body 31C. Opening S4 is defined by the edge 32b of the vibrating part 32, the edge 33c of the supporting part 34a, and the edge 33a of the supporting part 34c. Opening S5 is defined by the edge 32d of the vibrating part 32, the edge 33c of the supporting part 34b, and the edge 33c of the supporting part 34c. Openings S4 and S5 communicate with the hollow region V. In this modified example, viewed from the Y-axis direction, opening S4 is rectangular with the edge 32b of the vibrating part 32, the edge 33c of the supporting part 34a, and the edge 33a of the supporting part 34c as its three sides. Viewed from the Y-axis direction, opening S5 is rectangular with the edge 32d of the vibrating part 32, the edge 33c of the supporting part 34b, and the edge 33c of the supporting part 34c as its three sides.

[0073] Ribs 35C and 35D have the same shape as rib 35. Ribs 35, 35C, and 35D are connected to the main body 31 at different locations. For example, a pair of ribs 35C and 35D are connected to the main body 31C by adhesive or double-sided tape. Ribs 35C and 35D may also be integrally formed with the main body 31C. Ribs 35C and 35D have a long strip shape with their long sides extending in a direction orthogonal to the Z-axis and intersecting the Y-axis. Ribs 35C and 35D extend along the X-axis.

[0074] Viewed from the Y-axis direction, rib 35C extends along the X-axis between support portion 34a and support portion 34c. Viewed from the Y-axis direction, rib 35C at least covers the center of opening S4. In other words, viewed from the direction corresponding to rib 35C, rib 35C covers the center of hollow region V. Rib 35C has a pair of ends 36C, 37C and a central portion 38C. The pair of ends 36C, 37C are connected to the main body portion 31C. The central portion 38C is connected to the pair of ends 36C, 37C. The central portion 38C is separate from the main body portion 31C. In this modified example, end 36C of rib 35C is connected to support portion 34c, and end 37C of rib 35C is connected to support portion 34a.

[0075] The central portion 38C extends along the X-axis from one of the ends 36C and 37C toward the other. The central portion 38C has the same shape as the central portion 38. The edge 38a of the central portion 38C and the edge 32b of the vibrating portion 32 together define the opening S1. Viewed from the X-axis direction, the central portion 38C at least covers the center of the opening S4 and faces the piezoelectric element 10. Viewed from the Y-axis direction, the central portion 38C is disposed between a pair of support portions 34a and 34c. In other words, viewed from the Y-axis direction, the central portion 38C is disposed in a manner that overlaps with the hollow region V.

[0076] Viewed from the Y-axis direction, rib 35D extends along the X-axis between support portion 34b and support portion 34c. Viewed from the Y-axis direction, rib 35D at least covers the center of opening S5. In other words, viewed from the direction corresponding to rib 35D, rib 35D covers the center of hollow region V. Rib 35D has a pair of ends 36D, 37D and a central portion 38D connected to the pair of ends 36D, 37D. The pair of ends 36D, 37D are connected to the main body portion 31C. The central portion 38D is separate from the main body portion 31C. In this modified example, end 36D of rib 35D is connected to support portion 34b, and end 37D of rib 35D is connected to support portion 34c.

[0077] The central portion 38D extends along the X-axis from one of the ends 36D and 37D toward the other. The central portion 38D has the same shape as the central portion 38. The edge 38a of the central portion 38D and the edge 32b of the vibrating portion 32 together define the opening S1. Viewed from the X-axis direction, the central portion 38D at least covers the center of the opening S5 and faces the piezoelectric element 10. Viewed from the Y-axis direction, the central portion 38D is disposed between a pair of support portions 34b and 34c. In other words, viewed from the Y-axis direction, the central portion 38D is disposed in a manner that overlaps with the hollow region V.

[0078] As another variation of this modification, the ribs 35, 35C, and 35D of the audio device 3C can also be replaced with ribs of the same shape as ribs 35A and 35B, respectively. In this case, at least one of the ribs 35, 35C, and 35D can also be replaced with a rib of the same shape as ribs 35A and 35B.

[0079] As explained above, in the audio devices 3, 3A, 3B, and 3C, viewed from the X-axis direction, the ribs 35, 35A, and 35B cover the center of the hollow region V defined by the vibrating part 32 and the multiple support parts 34a, 34b, and 34c. According to this structure, when the audio devices 3, 3A, 3B, and 3C emit sound while mounted on the cover member 2, the sound pressure level at the desired frequency band is adjusted by the ribs 35, 35A, and 35B. In other words, when the audio devices 3, 3A, 3B, and 3C are mounted on the cover member 2, they can emit sound with an adjusted sound pressure level at the desired frequency band. That is, the sound-emitting device 1 can emit sound with an adjusted sound pressure level at the desired frequency band.

[0080] Figure 12 This indicates the sound pressure level at each frequency in the sound-producing device 1 with and without the rib 35. Curve 71 indicates the sound pressure level at each frequency in the sound-producing device 1 with the rib 35. Curve 72 indicates the sound pressure level at each frequency in the sound-producing device 1 with the rib 35 removed. For example... Figure 12As shown, with the rib 35 provided, a significant increase in sound pressure level in frequency band F within the human audible range can be observed, while no significant change in sound pressure level is observed in frequency bands other than F. Thus, according to the sound-producing device 1, it can be confirmed that a sound with an adjusted sound pressure level in the desired frequency band is emitted.

[0081] In the audio devices 3, 3A, 3B, and 3C, the opening S1 extends through the Z-axis. The opening S1 is defined by ribs 35, 35A, 35B, 35C, 35D, and the main body 31. According to this structure, when the audio devices 3, 3A, 3B, and 3C emit sound while mounted on the cover member 2, the sound pressure level in the desired frequency band can be adjusted through the ribs 35, thereby increasing the overall sound pressure level across the entire frequency band.

[0082] In the audio devices 3, 3A, 3B, and 3C, each support portion 34a and 34b includes a rim 33b and a rim 33d. Viewed from the X-axis, the rim 33d of each support portion 34a and 34b is further away from the main surface β in the Z-axis direction than the ribs 35, 35A, 35B, 35C, and 35D. Based on this structure, an opening S3 is formed. When the cover member 2 is in place, the opening S3 communicates with the hollow region V between the cover member 2 and the ribs 35, 35A, 35B, 35C, and 35D. In the sound-producing device 1, when viewed from the X-axis, the opening S3 is defined by the cover member 2, a pair of support portions 34a and 34b, and the ribs 35, 35A, 35B, 35C, and 35D. In this case, the sound pressure level in the desired frequency band is adjusted by the ribs 35, 35A, 35B, 35C, and 35D, while simultaneously increasing the overall sound pressure level across the entire frequency band.

[0083] In audio devices 3, 3A, 3B, and 3C, ribs 35, 35A, and 35B have a pair of ends 36 and 37 and a central portion 38. The central portion 38 has a curved surface 39. The curved surface 39 is curved in a manner facing the piezoelectric element 10 and away from the piezoelectric element 10 in the X-axis direction. In audio device 3C, rib 35C has a pair of ends 36C and 37C and a central portion 38C. In audio device 3C, rib 35D has a pair of ends 36D and 37D and a central portion 38D. The central portion 38D has a curved surface 39. According to this structure, when sound is emitted in the state of being installed in the cover member 2, the sound pressure level in the desired frequency band can be more appropriately adjusted by the ribs 35, 35A, 35B, 35C, and 35D.

[0084] In the audio devices 3 and 3C, the curved surface 39 of rib 35 is continuously connected to a pair of ends 36 and 37. The curved surface 39 is curved such that the further away from the pair of ends 36 and 37, the farther away from the piezoelectric element 10. The curved surface 39 of rib 35C is continuously connected to a pair of ends 36C and 37C. The curved surface 39 is curved such that the further away from the pair of ends 36C and 37C, the farther away from the piezoelectric element 10 in the X-axis direction. The curved surface 39 of rib 35D is continuously connected to a pair of ends 36D and 37D. The curved surface 39 is curved such that the further away from the pair of ends 36D and 37D, the farther away from the piezoelectric element 10. According to this structure, when sound is emitted while the cover member 2 is in the position of being installed, the sound pressure level in the desired frequency band can be more appropriately adjusted by the ribs 35, 35C, and 35D.

[0085] In the audio device 3A, the central portion 38 includes multiple curved surfaces 39. The central portion 38 has a protrusion 53. Viewed from the Z-axis direction, the protrusion 53 protrudes toward the vibrating portion 32 from a position where it is held between adjacent curved surfaces 39. According to this structure, when sound is emitted in the state of being installed in the cover member 2, the sound pressure level in the desired frequency band can be suppressed more appropriately by means of the rib 35.

[0086] In the audio device 3C, the housing 30C has multiple ribs 35, 35C, and 35D. These ribs 35, 35C, and 35D are connected to the main body 31C at different locations. According to this structure, when the audio device 3C emits sound while mounted in the enclosure, the sound pressure level in the desired frequency band can be more appropriately adjusted via each rib 35, 35C, and 35D. This can further improve the overall sound pressure level across the entire frequency range.

[0087] As described above, embodiments and variations of the present invention have been explained, but the present invention is not necessarily limited to the embodiments described above, and various modifications can be made without departing from its spirit.

[0088] In the above embodiments and modifications, ribs 35, 35A, 35B, 35C, and 35D are curved along the curved surface 39, and the surface opposite to the curved surface 39 is also curved. However, the surface opposite to the curved surface 39 may not be a surface along the curved surface 39. For example, the surface opposite to the curved surface 39 may be a plane. For example, rib 35B has a convex surface 61a on the side opposite to the concave surface 61b containing the curved surface 39. However, the surface opposite to the concave surface 61b may also be a plane.

[0089] Multiple support portions 34a, 34b, and 34c can also be formed as a single curved plate. In this case, when viewed from the Z-axis direction, support portion 33 can also be bent in a manner that surrounds the piezoelectric element 10.

[0090] Explanation of reference numerals in the attached figures

[0091] 1. Sound-producing device

[0092] 2. Cover components

[0093] 2a Mounting surface

[0094] 3. 3A, 3B, 3C audio components

[0095] 10 Piezoelectric elements

[0096] Frames 30, 30A, 30B, and 30C

[0097] 31, 31A, 31C Main Body

[0098] 32 Vibrating section

[0099] 32a, 32b, 32d, 33b, 33d (Fate / Destiny)

[0100] Support parts 33, 34a, 34b, 34c

[0101] Ribs 35, 35A, 35B, 35C, 35D

[0102] Ends of 36, 36C, 36D, 37, 37C, and 37D

[0103] 38, 38C, 38D Central Department

[0104] 39. Curved surface

[0105] 53. Protrusion

[0106] S1 and S3 openings

[0107] β main surface

[0108] V Hollow region.

Claims

1. An audio device comprising: piezoelectric elements; and The frame is equipped with the piezoelectric element. The frame has: The main body includes a vibrating portion comprising a vibrating surface on which the piezoelectric element is disposed, and a plurality of support portions extending from the vibrating portion in a first direction intersecting the vibrating surface and disposed along the edge of the vibrating portion; and A rib, which is connected to the main body, and viewed from the second direction along the vibration surface, extends along the third direction between a pair of support portions that are opposite and separated from each other in a third direction intersecting the second direction. The frame has a hollow region defined by the vibrating part, the plurality of supporting parts, and the ribs, and an opening defined by the ribs and the main body and communicating with the hollow region. The central portion of the rib is separated from the vibrating portion, and when viewed from the second direction, the rib covers the center of the hollow region. The opening defined by the rib and the main body is open on the vibrating part side in the first direction.

2. The audio device according to claim 1, wherein, The opening defined by the rib and the main body extends through in the first direction.

3. The audio device according to claim 1, wherein, Each of the aforementioned support portions includes: a first edge extending along and connected to the vibrating portion; and a second edge located on the opposite side of the first edge in the first direction. Viewed from the second direction, the second edge of each support portion is further away from the vibration surface than the rib portion in the first direction.

4. The audio device according to claim 2, wherein, Each of the aforementioned support portions includes: a first edge extending along and connected to the vibrating portion; and a second edge located on the opposite side of the first edge in the first direction. Viewed from the second direction, the second edge of each support portion is further away from the vibration surface than the rib portion in the first direction.

5. The audio device according to any one of claims 1 to 4, wherein, The rib has: a pair of end portions connected to the main body portion; and a central portion connected to the pair of end portions and separated from the main body portion. The central portion has a curved surface that bends toward the piezoelectric element and away from the piezoelectric element in the second direction.

6. The audio device according to claim 5, wherein, The curved surface is continuously connected to the pair of ends and is curved in such a way that the further away from the pair of ends the piezoelectric element is.

7. The audio device according to claim 5, wherein, The central portion includes a plurality of the curved surfaces and has a protrusion that protrudes toward the vibrating portion from a position where it is held between the curved surfaces that are adjacent to each other, when viewed from the first direction.

8. The audio device according to any one of claims 1 to 4, wherein, The frame has a plurality of ribs that are connected to the main body at different locations. Viewed from the second direction corresponding to each of the ribs, the plurality of ribs cover the center of the hollow region.

9. A sound-producing device comprising: The audio device according to any one of claims 1 to 8; and The cover component has a mounting surface facing the vibrating surface and connecting the plurality of supports.

10. The sound-producing device according to claim 9, wherein, When viewed from the second direction, an opening is formed by the cover component, the pair of supports, and the ribs.

11. An audio device comprising: piezoelectric elements; and The frame is equipped with the piezoelectric element. The frame has: The main body includes a vibrating portion comprising a vibrating surface on which the piezoelectric element is disposed, and a support portion extending from the vibrating portion in a first direction intersecting the vibrating surface; and The rib, which is connected to the main body, extends from the second direction along the vibration surface along a third direction intersecting the second direction. The frame has a hollow region defined by the vibrating part, the supporting part, and the rib, and an opening defined by the rib and the main body and communicating with the hollow region. The central portion of the rib is separated from the vibrating portion, and when viewed from the second direction, the rib covers the center of the hollow region. The opening defined by the rib and the main body is open on the vibrating part side in the first direction.

Images