Sound device

Abstract

The audio device (1) of the present invention includes a matching part (100), which is a matching part (100) provided on the inner wall surface of the housing (90). The matching part matches the acoustic impedance so that the sound from the sound source (50) provided inside the housing (90) can be transmitted to the outside of the housing (90). The matching part (100) has a support frame (20) provided on the inner wall surface of the housing (90) and a diaphragm (10) supported by the support frame (20). The support frame (20) is configured to be away from the sound source (50).

Description

Technical Field

[0001] This invention relates to audio devices. Background Technology

[0002] An audio device is a device that transmits sound from a sound source. For example, an audio device has a sound source and a housing that contains the sound source. The housing obstructs the propagation of sound. Therefore, an audio device needs a solution to transmit sound through the housing.

[0003] For example, Patent Document 1 discloses an ultrasonic transducer comprising a first acoustic transducer, a second acoustic transducer, and a bottomed cylindrical housing. The second acoustic transducer has a second diaphragm portion, an annular portion supporting the second diaphragm portion, and an acoustic matching plate that is spaced apart from the second diaphragm portion and forms a sealed space with the housing.

[0004] Patent Document 1: International Publication No. 2021 / 192417

[0005] As solutions to increase the sound propagation to the outside, such as increasing the driving voltage of the sound source or creating holes in the housing to serve as sound propagation paths have been considered. However, increasing the driving voltage of the sound source may reduce reliability, and creating holes in the housing may affect the appearance and reduce aesthetics, or reduce waterproof and dustproof functions.

[0006] According to the ultrasonic transducer described in Patent Document 1, the ultrasonic waves emitted from the first acoustic transducer are matched with the acoustic impedance of the external medium by a second acoustic transducer. Therefore, the sound propagating to the outside can be increased without causing a decrease in reliability due to an increase in driving voltage, or a decrease in waterproofing or dustproofing due to openings in the housing. However, since the ultrasonic transducer described in Patent Document 1 is integrally constructed with the sound source and the matching part that matches the acoustic impedance of the sound emitted from the sound source, the design freedom of the audio device incorporating this ultrasonic transducer is limited. Furthermore, the installation freedom is limited because the ultrasonic transducer needs to be installed exposed within the audio device. Summary of the Invention

[0007] The present invention was made in view of the following circumstances, and its purpose is to provide an audio device with increased freedom of design and installation.

[0008] One aspect of the present invention provides an audio device comprising a matching part disposed on the inner wall surface of a housing, the matching part matching acoustic impedance so that sound from a sound source disposed inside the housing propagates to the outside of the housing, the matching part having a support frame disposed on the inner wall surface of the housing and a diaphragm supported by the support frame, the support frame being configured away from the sound source.

[0009] Another aspect of the present invention provides an audio device comprising: a sound source disposed inside a housing; and a matching part disposed on an inner wall surface of the housing, the matching part matching acoustic impedance to allow sound from the sound source to propagate to the outside of the housing, the matching part having a support frame disposed on the inner wall surface of the housing and a diaphragm supported by the support frame, the support frame being configured to be away from the sound source.

[0010] Another aspect of the present invention provides an audio device comprising: a housing; a sound source disposed inside the housing; and a matching part disposed on the inner wall surface of the housing, the matching part matching acoustic impedance to allow sound from the sound source to propagate to the outside of the housing, the matching part having a support frame disposed on the inner wall surface of the housing and a diaphragm supported by the support frame, the support frame being configured away from the sound source.

[0011] According to the present invention, an audio device with increased design and installation freedom can be provided. Attached Figure Description

[0012] Figure 1 This is an exploded perspective view of the audio device according to the first embodiment.

[0013] Figure 2 This is a cross-sectional view of the audio device according to the first embodiment.

[0014] Figure 3 This is a graph representing the simulation results in the first embodiment.

[0015] Figure 4 This is a cross-sectional view of the audio device according to the second embodiment.

[0016] Figure 5 This is a graph representing the simulation results in the second embodiment.

[0017] Figure 6 This is a cross-sectional view of the audio device according to the third embodiment.

[0018] Figure 7 This is a cross-sectional view of the audio device according to the fourth embodiment.

[0019] Figure 8 This is a cross-sectional view of the audio device according to the fifth embodiment.

[0020] Figure 9 This is a cross-sectional view of the audio device according to the sixth embodiment. Detailed Implementation

[0021] The embodiments of the present invention will be described below. In the following drawings, the same or similar reference numerals denote the same or similar constituent elements. The drawings are illustrative, and the dimensions and shapes of the parts are schematic and should not be interpreted as limiting the scope of the present invention to these embodiments.

[0022] <First Implementation>

[0023] First, refer to Figure 1 and Figure 2 The structure of the audio device according to the first embodiment will be described. Figure 1 This is an exploded perspective view of the audio device according to the first embodiment. Figure 2 This is a cross-sectional view of the audio device according to the first embodiment.

[0024] The audio device 1 includes a housing 90, a matching part 100, and a sound-emitting component 200.

[0025] The housing 90 is a container that houses the matching part 100 and the sound-generating component 200 within its internal space. Specifically, it is the housing of a sound-generating product such as a household appliance or portable device. The housing 90 seals the internal space. The shape of the housing 90 is, for example, cylindrical. The materials of the main walls 91 and 92 and the side walls 93 are not particularly limited, and can be appropriately selected from metal, ceramic, semiconductor, resin, etc. The materials of the main walls 91 and 92 and the side walls 93 may be the same, but they may also be different from each other.

[0026] The housing 90 has main wall portions 91 and 92 and a side wall portion 93. Main wall portions 91 and 92 are opposite to each other. Main wall portions 91 and 92 are disc-shaped. One end of the side wall portion 93 is connected to the end of the main wall portion 91, and the other end of the side wall portion 93 is connected to the end of the main wall portion 92. That is, the side wall portion 93 connects the ends of the main wall portions 91 and 92. The side wall portion 93 is cylindrical.

[0027] The main wall portion 91 has an inner wall surface 91A disposed on the side opposite to the main wall portion 92 and the side wall portion 93, and an outer wall surface 91B disposed on the side opposite to the inner wall surface 91A. The main wall portion 92 has an inner wall surface 92A disposed on the side opposite to the main wall portion 91 and the side wall portion 93, and an outer wall surface 92B disposed on the side opposite to the inner wall surface 92A. The side wall portion 93 has an inner wall surface 93A disposed on the side opposite to the main wall portions 91 and 92, and an outer wall surface 93B disposed on the side opposite to the inner wall surface 93A. The inner wall surfaces 91A, 92A, and 93A are the inner surfaces of the housing 90 that surround the internal space of the housing containing the matching part 100 and the sound-emitting member 200. The outer wall surfaces 91B, 92B, and 93B are the outer surfaces of the housing 90 that are exposed to the external space.

[0028] Furthermore, the shell is not limited to a structure where the internal space is sealed. The shell may also be open, meaning the internal space of the shell is connected to the external space. In this case, cylindrical or slit-shaped holes may be formed in the main wall or side wall of the shell. The shape of the shell is not limited to cylindrical, as long as it can accommodate the mating part and the sound-generating component. For example, it may also be a polygonal prism, an elliptical prism, a polygonal frustum, a frustum conical, an elliptical frustum conical, a sphere, an ellipsoidal sphere, or a combination of these shapes.

[0029] The matching unit 100 allows sound from the sound source 50 (described later) included in the sound-generating component 200 to propagate through the housing 90. The matching unit 100 is provided on the inner wall surface 91A of the main wall portion 91. The matching unit 100 matches the acoustic impedance of the gas filling the interior space of the housing 90 at the sound frequency of the sound source 50 with the acoustic impedance of the main wall portion 91 of the housing 90. The gas inside the housing 90 is, for example, air, and the acoustic impedance of air differs significantly from that of the main wall portion 91 of the housing 90. At the boundary between media with a large difference in acoustic impedance, sound is reflected, but because the matching unit 100 matches the acoustic impedance, sound reflection at the inner wall surface 91A of the main wall portion 91 is suppressed. In other words, through the matching unit 100, sound emitted from the sound source 50 within the interior space of the housing 90 is efficiently propagated to the exterior space of the housing 90.

[0030] Furthermore, the internal space of the housing 90 may be filled with air, but it is not limited to being filled with a fluid in which the sound emitted by the sound-emitting component 200 can propagate. The fluid filling the internal space of the housing 90 may also be a rare gas, an inert gas such as nitrogen, a mixture of gases containing air, or a liquid such as water.

[0031] The matching part 100 has a support frame 20 and a vibrating diaphragm 10.

[0032] A support frame 20 is disposed on the inner wall surface 91A of the main wall portion 91 of the housing 90. The support frame 20 supports the vibrating diaphragm 10. The support frame 20 is cylindrical in shape, for example, a cylindrical shape. The material of the support frame 20 is not particularly limited, and can be appropriately selected from metal, ceramic, semiconductor, resin, etc.

[0033] The support frame 20 has end faces 21 and 22, an inner side 20A, and an outer side 20B.

[0034] End face 21 is the surface connecting the inner surface 20A and the outer surface 20B on the side opposite to the main wall portion 91, and is configured in a frame shape. End face 22 is the surface connecting the inner surface 20A and the outer surface 20B on the side opposite to the main wall portion 92, and is configured in a frame shape. End face 21 is connected to the inner wall surface 91A of the main wall portion 91 of the housing 90. That is, the end of the support frame 20 on the end face 21 side is a closed end closed by the inner wall surface 91A. End face 22 is separately provided from the housing 90 and the sound-generating component 200, and is exposed in the internal space of the housing 90. That is, the end of the support frame 20 on the end face 22 side is an open end open relative to the internal space of the housing 90. The end of the support frame 20 on the end face 21 side is an example of "one end of the support frame", and the end of the support frame 20 on the end face 22 side is an example of "the other end of the support frame".

[0035] The inner side 20A is a side surface located opposite to the outer side 20B. The outer side 20B is a side surface located opposite the side wall portion 93 of the housing 90. A vibrating diaphragm 10 is attached to both the inner side 20A and the end face 22. Although not shown in the figure, an adhesive for fixing the support frame 20 to the housing 90 can also be provided on the outer side 20B. In this case, the adhesive is provided in a fillet shape along the outer side 20B of the support frame 20 and the inner wall surface 91A of the main wall portion 91 of the housing 90. The adhesive can also be provided between the inner wall surface 91A of the main wall portion 91 of the housing 90 and the end face 21 of the support frame 20. Furthermore, a mounting portion for mounting the support frame 20 to the housing 90 can also be provided on the outer side 20B. In this case, the mating portion can also be mounted to the inner wall surface of the housing via the mounting portion through snap-fitting, fitting, threaded fixing, etc.

[0036] The diaphragm 10 is supported by the support frame 20. Specifically, the diaphragm 10 is connected to the entire circumference of the inner side surface 20A of the support frame 20. The diaphragm 10 is provided at a predetermined interval from the inner wall surface 91A of the main wall portion 91 of the housing 90. The diaphragm 10 divides the space enclosed by the inner side surface 20A of the support frame 20 into a space on the end face 21 side and a space on the end face 22 side. The space enclosed by the main wall portion 91 of the housing 90, the support frame 20, and the diaphragm 10 is sealed. When viewed from above in the direction where the main wall portions 91 and 92 overlap (hereinafter, "viewed from above"), the center portion of the diaphragm 10 overlaps, for example, with the center portions of the main wall portions 91 and 92 of the housing 90, but is not limited to this. When viewed from above, the center portion of the diaphragm 10 may also be away from the center portions of the main wall portions 91 and 92.

[0037] The diaphragm 10 has a thickness along the direction opposite to the main wall portions 91 and 92, and has a main surface extending along the inner wall surfaces 91A and 92A of the main wall portions 91 and 92. When the direction in which the diaphragm 10 has its thickness is referred to as the "thickness direction," the diaphragm 10 is held by the support frame 20 to be able to vibrate in the thickness direction. Since the diaphragm 10 vibrates through sound propagation from the sound-generating member 200, the matching portion 100 matches the acoustic impedance of the internal space of the housing 90 with the acoustic impedance of the main wall portion 91 of the housing 90. The material of the diaphragm 10 is not particularly limited, and can be appropriately selected from metals, ceramics, semiconductors, resins, etc. The material, mass, and position of the diaphragm 10 are appropriately designed according to the sound frequency of the sound-generating member 200 that matches the acoustic impedance, the acoustic impedance of the gas in the internal space of the housing 90, and the acoustic impedance of the main wall portion 91 of the housing 90.

[0038] The sound-emitting component 200 emits sound. The sound-emitting component 200 is, for example, provided on an inner wall surface 92A opposite to the inner wall surface 91A where the mating part 100 is provided.

[0039] Furthermore, the configuration of the sound-generating component 200 is not limited to the above. The sound-generating component 200 may also be disposed on the inner wall surface 93A or the inner wall surface 91A.

[0040] The sound-generating component 200 has a sound source 50 and a substrate 60.

[0041] The sound source 50 is, for example, a piezoelectric resonating element using crystal, PZT, AlN, lithium niobate, or lithium tantalate as the piezoelectric element. The sound source 50 is, for example, disposed on the side of the substrate 60 opposite to the mating portion 100. The sound source 50 is configured away from the support frame 20. When viewed from above in the thickness direction of the diaphragm 10, the sound source 50 overlaps with the mating portion 100. That is, the sound source 50 is disposed at a distance from the support frame 20 in the thickness direction of the diaphragm 10. When viewed from above, the center portion of the sound source 50 overlaps with the center portion of the main wall portions 91 and 92 of the housing 90.

[0042] Furthermore, the sound source is not limited to the above. When the sound source is a vibrating element, the driving force causing the sound source to vibrate can also be electrostatic or electromagnetic. The sound source can also be a buzzer with a casing or a loudspeaker. Additionally, the position of the sound source is not limited to the above, as long as it is positioned away from the mating part. When viewed from above, the center of the sound source can also be far from the center of the main wall of the casing. The sound source can be arbitrarily positioned relative to the mating part as long as it is located within the internal space of the casing.

[0043] The substrate 60 is a mounting substrate for mounting the sound source 50. The substrate 60 includes electrodes for applying electrical signals, etc., to the sound source 50. Although not shown in the figure, wiring for connecting the sound source 50 to an external circuit is connected to the substrate 60. The substrate 60 is disposed on the inner wall surface 91A, 92A, or 93A, and the sound source 50 is disposed on the inner wall surface 91A, 92A, or 93A via the substrate 60.

[0044] Alternatively, the substrate can be omitted. In this case, the sound source is, for example, directly disposed on the inner wall surface of the housing and connected to the wiring.

[0045] Next, refer to Figure 3 The sound propagation efficiency in the first embodiment will be explained. Figure 3 This is a graph representing the simulation results in the first embodiment. Figure 3 The horizontal axis of the chart shown, “gap size [mm]”, represents the gap between the support frame 20 and the sound source 50 in the thickness direction. Figure 3 The vertical axis of the graph shown, "Acoustic Energy Propagation Rate," represents the ratio of acoustic energy propagating through the matching part 100 to the external space of the housing 90. This vertical axis is calculated based on the acoustic energy propagating to the external space of the housing 90 in the structure where the sound source 50 contacts the support frame 20 of the matching part 100, i.e., as 100%. Figure 3 In the chart shown, the "open" curve represents the simulation results when the side wall portion 93 of the housing 90 is omitted, and the "closed" curve represents the simulation results when the housing 90 is closed.

[0046] (Simulation conditions)

[0047] Viewed from above, the diaphragm 10, the sound source 50, and the main wall portions 91 and 92 are circular, with their centers overlapping. The matching portion 100 is disposed on the main wall portion 91. The substrate 60 is omitted, and the sound source 50 is directly disposed on the main wall portion 92. In the simulation of the "sealed" curve of the housing 90 being sealed, the internal space of the housing 90 is filled with air.

[0048] Radius of the diaphragm 10 when viewed from above: 5mm

[0049] The gap between the diaphragm 10 and the main wall portion 91 is 0.172 mm.

[0050] Mass of diaphragm 10: 0.0958g

[0051] The radius of the area enclosed by the inner side 20A of the support frame 20: 5mm

[0052] The radius of the area enclosed by the outer side 20B of the support frame 20: 5.1mm

[0053] The thickness dimension of the internal space of the housing 90 is 10mm.

[0054] Radius of the internal space of the casing 90 when viewed from above: 20mm

[0055] The density of the main wall portion 91 of the shell 90 is 1050 kg / m³. 3

[0056] The sound velocity at the main wall portion 91 of the casing 90 is 2300 m / s.

[0057] The density of the gas inside the shell 90 is 1.144 kg / m³. 3

[0058] The speed of sound of the gas inside the casing 90 is 340 m / s.

[0059] Sound source 50's sound frequency: 4000Hz

[0060] Radius of sound source 50 when viewed from above: 5mm

[0061] Output of sound source 50: 1Pa

[0062] The "gap size" in the thickness direction between the support frame 20 and the sound source 50: 0mm, 1mm, 2mm, 4mm, 8mm

[0063] As shown by the "sealed" curve, when the internal space of the housing 90 is sealed, even if the gap size increases, the sound energy transmission rate remains at approximately 100% and does not decrease. This is because sound that does not travel directly from the sound source 50 to the diaphragm 10 of the matching part 100 is reflected by the inner wall surfaces 91A, 92A, and 93A of the housing 90 and indirectly transmitted to the diaphragm 10 of the matching part 100.

[0064] As shown by the "open" curve, when the sidewall portion 93 of the housing 90 is omitted, the sound energy propagation rate decreases if the gap size increases. This is because the sound from the sound source 50 that does not directly propagate to the diaphragm 10 of the matching portion 100 is dissipated instead of propagating to the diaphragm 10 of the matching portion 100. Even when the sidewall portion 93 is omitted, a small gap size can suppress the decrease in sound energy propagation rate. Furthermore, in this simulation, since the simulation was conducted with all the sidewall portions 93 of the housing 90 omitted, the rate of decrease in sound energy propagation rate is large, but when the opening in the housing 90 is small, the decrease in sound energy propagation rate can be suppressed.

[0065] As described above, according to this embodiment, the audio device 1 includes a matching portion 100 disposed on the inner wall surface 91A of the housing 90. The matching portion 100 matches the acoustic impedance so that sound from the sound source 50 propagates through the housing 90. The matching portion 100 has a support frame 20 disposed on the inner wall surface 91A of the housing 90 and a diaphragm 10 supported by the support frame 20. The support frame 20 is configured to be away from the sound source 50.

[0066] Therefore, since the matching section 100 does not require wiring connections like the sound source 50, it can be positioned in the desired direction for sound propagation. Because the matching section 100 can be freely positioned relative to the sound source 50, the design freedom of the audio device 1 is increased. Furthermore, the matching section 100 can be mounted on the inner wall surface 91A of the housing 90, eliminating the need to drill holes in the housing and expose a portion of it for mounting. Therefore, the installation freedom of the audio device 1 is increased. Additionally, if the audio device lacks a matching section 100, or if the sound pressure level is insufficient even with a matching section 100, a matching section 100 can be subsequently added to increase the sound pressure level of the audio device.

[0067] As one embodiment of this invention, the housing 90 seals the internal space.

[0068] This improves the sound energy propagation rate of the audio device 1 into the external space.

[0069] Other embodiments will be described below. Furthermore, structures that are the same as or similar to those shown in the first embodiment will be labeled with the same or similar reference numerals, and their descriptions will be omitted as appropriate. Additionally, the same effects achieved by the same structures will not be mentioned sequentially.

[0070] <Second Implementation>

[0071] Next, refer to Figure 4 The structure of the audio device 2 in the second embodiment will be described. Figure 4 This is a cross-sectional view of the audio device according to the second embodiment.

[0072] When viewed from above, the center of the sound source 50 is far from the center of the diaphragm 10. For example, when viewed from above, a portion of the sound source 50 overlaps with the diaphragm 10, a portion of the sound source 50 overlaps with the support frame 20, and a portion of the sound source 50 is located outside the mating portion 100. Furthermore, the position of the sound source 50 is not limited to the above; for example, the sound source 50 may be completely far from the diaphragm 10, or the sound source 50 may be completely far from the support frame 20.

[0073] Next, refer to Figure 5 The sound propagation efficiency in the second embodiment will be explained. Figure 5This is a graph representing the simulation results in the second embodiment. Figure 5 The horizontal axis of the graph shown, “Offset [mm]”, represents the distance between the center of the diaphragm 10 and the center of the sound source 50 when viewed from above. Figure 5 The vertical axis of the graph shown, "Acoustic Energy Propagation Rate," represents the ratio of acoustic energy propagated through the matching part 100 to the external space of the housing 90. This vertical axis is calculated based on the acoustic energy propagated to the external space of the housing 90 in a structure where the center of the sound source 50 overlaps with the center of the diaphragm 10 when viewed from above, i.e., as 100%.

[0074] (Simulation conditions)

[0075] Viewed from above, the diaphragm 10, sound source 50, and main wall portions 91 and 92 are circular, and the internal space of the housing 90 is sealed. The matching portion 100 is disposed on the main wall portion 91. The substrate 60 is omitted, and the sound source 50 is directly disposed on the main wall portion 92. The internal space of the housing 90 is filled with air.

[0076] Radius of the diaphragm 10 when viewed from above: 5mm

[0077] The gap between the diaphragm 10 and the main wall portion 91 is 0.172 mm.

[0078] Mass of diaphragm 10: 0.0958g

[0079] The radius of the area enclosed by the inner side 20A of the support frame 20: 5mm

[0080] The radius of the area enclosed by the outer side 20B of the support frame 20: 5.1mm

[0081] The thickness dimension of the internal space of the housing 90 is 10mm.

[0082] Radius of the internal space of the casing 90 when viewed from above: 20mm

[0083] The density of the main wall portion 91 of the shell 90 is 1050 kg / m³. 3

[0084] The sound velocity at the main wall portion 91 of the casing 90 is 2300 m / s.

[0085] The density of the gas inside the shell 90 is 1.144 kg / m³. 3

[0086] The speed of sound of the gas inside the casing 90 is 340 m / s.

[0087] Sound source 50's sound frequency: 4000Hz

[0088] Radius of sound source 50 when viewed from above: 5mm

[0089] Output of sound source 50: 1Pa

[0090] The "offset" of the distance between the center of the diaphragm 10 and the center of the sound source 50 when viewed from above: 0mm, 10mm, 14.8mm

[0091] Even with an increase in offset, the sound energy propagation rate remains approximately 100% and does not decrease. This means that the position of the matching part 100 is not limited to a position opposite the sound source 50 when viewed from above; the matching part 100 can be freely configured as long as it is within the housing 90. Even if the shape of the substrate 60 or the components surrounding the sound source 50 prevent the matching part 100 from being positioned opposite the sound source 50, sound can still be sufficiently propagated to the outside of the housing 90.

[0092] <Third Implementation Method>

[0093] Next, refer to Figure 6 The structure of the audio device 3 in the third embodiment will be described. Figure 6 This is a cross-sectional view of the audio device according to the third embodiment.

[0094] In a direction parallel to the inner wall surfaces 91A and 92A of the main wall portions 91 and 92 of the housing 90, the sound source 50 is arranged at intervals from the support frame 20. In this direction, the sound source 50 may also be arranged side by side with the diaphragm 10.

[0095] Therefore, since the matching part 100 and the sound source 50 do not interfere with each other in the thickness direction of the diaphragm 10, the sound device 3 can be made to be lowered.

[0096] <Fourth Implementation>

[0097] Next, refer to Figure 7 The structure of the audio device 4 in the fourth embodiment will be described. Figure 7 This is a cross-sectional view of the audio device according to the fourth embodiment.

[0098] A matching part 100 is disposed on the main wall portion 92 of the housing 90, and the diaphragm 10 is disposed opposite to the substrate 60. The substrate 60 is disposed on any one of the inner wall surfaces 91A, 92A, and 93A, and the main surface of the substrate 60 extends along the inner wall surfaces 91A and 92A of the main wall portions 91 and 92. The diaphragm 10 is disposed on the side of the main wall portion 92 of the substrate 60. The sound source 50 is disposed on the side of the main wall portion 91 of the substrate 60. That is, the sound source 50 is disposed on the side of the substrate 60 opposite to the side opposite to the matching part 100. The sound emitted from the sound source 50 does not directly reach the diaphragm 10, but is reflected at least once by the inner wall surfaces 91A, 92A, and 93A of the housing 90 before reaching the diaphragm 10. Even with this configuration, sound can be sufficiently propagated to the outside of the housing 90.

[0099] <Fifth Implementation>

[0100] Next, refer to Figure 8 The structure of the audio device 5 in the fifth embodiment will be described. Figure 8 This is a cross-sectional view of the audio device according to the fifth embodiment.

[0101] A substrate 60 is disposed on any one of the inner wall surfaces 91A, 92A, and 93A, and the main surface of the substrate 60 extends along the inner wall surfaces 91A and 92A of the main wall portions 91 and 92. A sound source 50 is disposed on the side of the substrate 60 opposite to the main wall portion 91. A matching portion 100 is disposed on the side wall portion 93. The matching portion 100 is disposed on an inner wall surface 93A that is different from the inner wall surface 91A opposite to the main wall surface of the sound source 50. The vibration direction of the sound source 50 is a direction intersecting with the inner wall surfaces 91A and 92A of the main wall portions 91 and 92, and the vibration direction of the diaphragm 10 is a direction intersecting with the inner wall surface 93A of the side wall portion 93. That is, the vibration direction of the sound source 50 and the vibration direction of the diaphragm 10 intersect each other, for example, orthogonally. Even with this configuration, sound can be sufficiently propagated to the outside of the housing 90.

[0102] <Sixth Implementation Method>

[0103] Next, refer to Figure 9 The structure of the audio device 6 in the sixth embodiment will be described. Figure 9 This is a cross-sectional view of the audio device according to the sixth embodiment.

[0104] The matching part 100 and the sound-generating component 200 are disposed on the inner wall surface 91A of the main wall portion 91 of the housing 90. The matching part 100 and the sound-generating component 200 are arranged along the inner wall surface 91A. The substrate 60 is disposed on the inner wall surface 91A of the main wall portion 91, and the sound source 50 is disposed on the main wall portion 92 side of the substrate 60. The sound emitted from the sound source 50 does not directly reach the diaphragm 10, but reaches the diaphragm 10 after being reflected at least once on the inner wall surfaces 91A, 92A, 93A of the housing 90 or the support frame 20. Even with this configuration, sound can be sufficiently propagated to the outside of the housing 90.

[0105] The following are some or all of the embodiments of the present invention. However, the present invention is not limited to the following descriptions.

[0106] <1>

[0107] An audio device, wherein,

[0108] It includes a matching part, which is disposed on the inner wall surface of the housing, to match the acoustic impedance so that sound from a sound source disposed inside the housing can propagate to the outside of the housing.

[0109] The matching part has a support frame disposed on the inner wall surface of the housing and a vibrating diaphragm supported by the support frame.

[0110] The support frame is configured to be away from the sound source.

[0111] <2>

[0112] According to the audio device described in <1>, wherein...

[0113] It also has a sound source, which is located inside the housing.

[0114] <3>

[0115] An audio device comprising:

[0116] The sound source is located inside the housing; and

[0117] A matching section, disposed on the inner wall surface of the housing, matches the acoustic impedance to allow sound from the sound source to propagate to the outside of the housing.

[0118] The matching part has a support frame disposed on the inner wall surface of the housing and a vibrating diaphragm supported by the support frame.

[0119] The support frame is configured to be away from the sound source.

[0120] <4>

[0121] The sound device according to any one of <1> to <3>, wherein,

[0122] The support frame is set to a cylindrical shape.

[0123] One end of the support frame is a closed end, which is sealed by the inner wall of the shell.

[0124] The other end of the support frame is an opening that is open relative to the internal space of the shell.

[0125] <5>

[0126] The sound device according to any one of <1> to <4>, wherein,

[0127] The shell seals the internal space.

[0128] <6>

[0129] The sound device according to any one of <1> to <5>, wherein,

[0130] When viewed from above, the inner wall surface with the support frame is...

[0131] The center of the diaphragm is far from the center of the sound source.

[0132] <7>

[0133] The sound device according to any one of <1> to <6>, wherein,

[0134] In the direction parallel to the inner wall surface where the support frame is located,

[0135] The support frame is arranged at intervals, separated from the sound source.

[0136] <8>

[0137] The sound device according to any one of <1> to <7>, wherein,

[0138] The sound emitted from the sound source reaches the diaphragm after being reflected at least once by the inner wall of the shell.

[0139] <9>

[0140] The sound device according to any one of <1> to <8>, wherein,

[0141] The matching part is located on an inner wall surface that is different from the inner wall surface of the housing opposite to the main surface of the sound source.

[0142] <10>

[0143] An audio device comprising:

[0144] case;

[0145] The sound source is located inside the housing; and

[0146] A matching section, disposed on the inner wall surface of the housing, matches the acoustic impedance to allow sound from the sound source to propagate to the outside of the housing.

[0147] The matching part has a support frame disposed on the inner wall surface of the housing and a vibrating diaphragm supported by the support frame.

[0148] The support frame is configured to be away from the sound source.

[0149] As explained above, this provides an audio device that offers greater freedom in design and installation.

[0150] Furthermore, the embodiments described above are for the purpose of facilitating understanding of the present invention and are not intended to limit the interpretation of the present invention. The present invention can be modified / improved without departing from its spirit, and its equivalents are also included. That is, any method obtained by those skilled in the art through appropriate design changes to the embodiments and / or modifications, as long as it possesses the features of the present invention, is also included within the scope of the present invention. For example, the elements, their configurations, materials, conditions, shapes, dimensions, etc., of the embodiments and / or modifications are not limited to those illustrated and can be appropriately modified. In addition, the embodiments and modifications are illustrative, and it is self-evident that partial substitutions or combinations of the structures shown in different embodiments and / or modifications can be made; these methods, as long as they contain the features of the present invention, are also included within the scope of the present invention.

[0151] Explanation of reference numerals in the attached figures

[0152] 1…Audio device; 100…Matching part; 200…Sound-generating component; 10…Diaphragm; 20…Support frame; 21, 22…End face; 20A…Inner side; 20B…Outer side; 50…Sound source; 60…Substrate; 90…Housing; 91, 92…Main wall; 93…Side wall; 91A, 92A, 93A…Inner wall; 91B, 92B, 93B…Outer wall.

Claims

1. An audio device, wherein, The device includes a matching section, which is disposed on the inner wall surface of the housing. This matching section matches the acoustic impedance, allowing sound from a sound source disposed inside the housing to propagate to the outside of the housing. The aforementioned matching part has a support frame disposed on the inner wall surface of the aforementioned housing and a vibrating diaphragm supported by the aforementioned support frame. The aforementioned support frame is configured to be located away from the aforementioned sound source.

2. The audio device according to claim 1, wherein, It also has a sound source, which is located inside the housing.

3. An acoustic device, wherein, have: The sound source is located inside the housing; and A matching part is provided on the inner wall surface of the housing, which matches the acoustic impedance so that sound from the sound source can propagate to the outside of the housing. The aforementioned matching part has a support frame disposed on the inner wall surface of the aforementioned housing and a vibrating diaphragm supported by the aforementioned support frame. The aforementioned support frame is configured to be located away from the aforementioned sound source.

4. The audio device according to any one of claims 1 to 3, wherein, The aforementioned support frame is set to a cylindrical shape. One end of the aforementioned support frame is a closed end, which is sealed by the inner wall of the aforementioned shell. The other end of the aforementioned support frame is an opening that is open relative to the internal space of the aforementioned housing.

5. The audio device according to any one of claims 1 to 4, wherein, The aforementioned shell seals the internal space.

6. The audio device according to any one of claims 1 to 5, wherein, When viewed from above, the inner wall surface where the aforementioned support frame is installed, The center of the aforementioned diaphragm is far from the center of the aforementioned sound source.

7. The audio device according to any one of claims 1 to 6, wherein, In a direction parallel to the inner wall surface where the aforementioned support frame is located, The aforementioned support frame is arranged at intervals, separated from the aforementioned sound source.

8. The audio device according to any one of claims 1 to 7, wherein, The sound emitted from the aforementioned sound source reaches the aforementioned diaphragm after being reflected at least once by the inner wall surface of the aforementioned housing.

9. The audio device according to any one of claims 1 to 8, wherein, The matching part is located on an inner wall surface that is different from the inner wall surface of the housing opposite to the main surface of the sound source.

10. An audio device comprising: case; The sound source is located inside the aforementioned housing; and A matching part is provided on the inner wall surface of the housing, which matches the acoustic impedance so that sound from the sound source can propagate to the outside of the housing. The aforementioned matching part has a support frame disposed on the inner wall surface of the aforementioned housing and a vibrating diaphragm supported by the aforementioned support frame. The aforementioned support frame is configured to be located away from the aforementioned sound source.

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