Sound generating device

Abstract

To provide a sound generating device capable of preventing exposure of a diaphragm of a speaker and suppressing an increase in the number of components necessary for preventing exposure of the diaphragm.SOLUTION: A plurality of housing fins 24 provided in a housing opening 12a have a plate shape, are arranged in a third direction D3 with a housing fin inter-gap 24a therebetween, and are inclined with respect to the first direction D1 so as to be located closer to one side in the third direction D3 toward one side in the first direction D1. A plurality of sound emission hole fins 61 provided in a cover sound emission hole 60a have a plate shape, are arranged in the third direction D3 with a sound emission hole fin inter-fin gap 61a therebetween, and are inclined with respect to the first direction D1 so as to be located on the other side of the third direction D3 toward one side of the first direction D1. Further, the plurality of housing fins 24 are arranged so that the housing fin inter-gaps 24a are respectively connected to the sound emission hole fin inter-gaps 61a and the diaphragm 161 is not visually recognized through the cover sound emission hole 60a from one side in the first direction D1.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a sound-emitting device that emits sound. [Background technology]

[0002] A conventionally known example of this type of sound generating device is the sound generator described in Patent Document 1. The sound generator described in Patent Document 1 includes a housing that forms the outer shell of the sound generator and a speaker housed within the housing. Sound emitted by the speaker is dissipated to the outside through an opening in the housing.

[0003] In addition, to protect the speaker's diaphragm, a complex sound passage is formed in the opening of the housing by combining multiple parts, allowing air to pass through while preventing water from entering the housing from the outside. Because such a sound passage is formed, the sound generator housing is designed so that the speaker's diaphragm cannot be seen through the opening of the housing. In other words, the diaphragm is prevented from being exposed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2022-139884 Summary of the Invention [Problem to be solved by the invention]

[0005] Preventing the speaker's diaphragm from being exposed is a necessary measure to protect the diaphragm from water and the like, but in the sound generator of Patent Document 1, this is one of the reasons for increasing the number of parts in the sound generator. This increase in the number of parts also leads to an increase in the cost of the sound generator. As a result of detailed investigation by the inventor, the above findings were discovered.

[0006] In view of the above, an object of the present disclosure is to provide a sound generation device that can prevent the diaphragm of a speaker from being exposed and can suppress an increase in the number of parts required to prevent the diaphragm from being exposed. [Means for solving the problem]

[0007] In order to achieve the above object, a sound generating device according to one aspect of the present disclosure comprises: A sound generating device that is attached to a workpiece (60) and emits sound through a sound emission hole (60a) that penetrates the workpiece from one side to the other side in a first direction (D1), a housing (11) having a housing opening (12) formed with a housing opening (12a) that opens toward one side in a first direction, and disposed on the other side in the first direction relative to the mounting member, and fixed to the mounting member so that the housing opening overlaps the other side in the first direction relative to the sound emission hole; a speaker (16) housed in a housing and having a diaphragm (161) that vibrates to emit sound toward an opening of the housing; a plurality of housing fins (24) that are provided in the housing opening and fixed to the housing, extend in a second direction (D2) perpendicular to the first direction, are arranged with mutual gaps (24a) in a third direction (D3) perpendicular to the first and second directions, and are plate-shaped and inclined with respect to the first direction so that one side of the first direction is positioned closer to one side of the third direction; The mounting member has a plurality of sound emitting hole fins (61), the plurality of sound output hole fins extend in the second direction, are arranged in a line with mutual gaps (61a) in the third direction, are provided in the sound output holes, and have a plate shape inclined with respect to the first direction so that one side in the first direction is positioned closer to the other side in the third direction; The multiple housing fins are arranged so that the mutual gaps between the multiple housing fins are connected to the mutual gaps between the multiple sound emission hole fins from the other side of the first direction, and the diaphragm is not visible through the sound emission hole from one side of the first direction relative to the sound emission hole.

[0008] In this way, it is possible to prevent the speaker diaphragm from being exposed to one side of the mounting base in the first direction relative to the sound output hole. Furthermore, because the mounting base, which is the component to which the sound generation device is attached, is used to prevent the speaker diaphragm from being exposed, it is possible to suppress an increase in the number of parts required to prevent the diaphragm from being exposed in the sound generation device. At the same time, because it is easy to integrate the part of the mounting base that forms the sound output hole with the sound output hole fins, there is no concern that the number of parts in the mounting base will increase due to the provision of the sound output hole fins.

[0009] In addition, in each section of the application documents, each element may be assigned a reference number in parentheses. In this case, the reference number merely indicates an example of the correspondence between the element and the specific configuration described in the embodiment described below. Therefore, the present disclosure is not limited in any way by the description of the reference number. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram schematically illustrating a vehicle equipped with a sound generation device according to a first embodiment. [Figure 2] 1 is a cross-sectional view that schematically shows the general configuration of a sound generation device in a first embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing the cross section III-III of FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view showing the IV-IV cross section of FIG. 2. [Figure 5] FIG. 10 is a cross-sectional view showing a schematic configuration of a sound generation device in a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, including other embodiments described later, identical or equivalent parts are designated by the same reference numerals in the drawings.

[0012] (First embodiment) 1, the sound generation device 10 of this embodiment is mounted on a vehicle 80, and is installed, for example, outside the passenger compartment of the vehicle 80, and emits an alarm sound outside the vehicle. The vehicle 80 on which the sound generation device 10 is mounted may be an electric vehicle, a hybrid vehicle, an internal combustion vehicle, or the like.

[0013] 2 and 3 may be used to represent the orientations of the sound generation device 10. The first direction D1, second direction D2, and third direction D3 intersect with each other, or more precisely, are perpendicular to each other.

[0014] Furthermore, when the sound generation device 10 is mounted on the vehicle 80, the first direction D1 corresponds to the vehicle up-down direction Dz, which is the up-down direction of the vehicle 80, the second direction D2 corresponds to the vehicle left-right direction Dx, which is the left-right direction of the vehicle 80, and the third direction D3 corresponds to the vehicle fore-aft direction Dy, which is the front-to-rear direction of the vehicle 80. One side of the first direction D1 is the lower side in the vehicle up-down direction Dz, i.e., the lower side in the vehicle direction, and the other side of the first direction D1 is the upper side in the vehicle up-down direction Dz, i.e., the upper side in the vehicle direction. Furthermore, one side of the third direction D3 corresponds to the rear side in the vehicle fore-and-aft direction Dy, i.e., the rear side in the vehicle direction, and the other side of the third direction D3 corresponds to the front side in the vehicle fore-and-aft direction Dy, i.e., the front side in the vehicle direction.

[0015] 1 to 3, in vehicle 80, sound generation device 10 is provided on the other side in first direction D1 with respect to undercover 60, and is attached to undercover 60 as an attachment member. Undercover 60 is provided on vehicle 80, and is provided so as to cover the road surface 82 side of vehicle body 81, i.e., the lower side in the vehicle direction, and is fixed to vehicle body 81. Undercover 60 is made of resin, for example, and is formed by injection molding.

[0016] The undercover 60 is formed to extend in the second direction D2 and the third direction D3, and is provided with a cover sound emission hole 60a, which is a sound emission hole through which the sound emitted by the sound generating device 10 passes toward the outside of the vehicle. The cover sound emission hole 60a is a through-hole that penetrates the undercover 60 from one side to the other in the first direction D1. The sound generating device 10 emits sound through the cover sound emission hole 60a. Note that FIG. 2 shows a cross section taken along line II-II in FIG. 3.

[0017] The sound generation device 10 includes a housing 11, a speaker 16, and a plurality of housing fins 24. The housing 11 of the sound generation device 10 is a component that forms the outer shell of the sound generation device 10 and is made of, for example, resin. The housing 11 is formed as a hollow box having a substantially rectangular parallelepiped shape, and an internal space, that is, an internal housing space 11a, is formed inside the housing 11. The speaker 16 is housed in the internal housing space 11a, and the speaker 16 is fixed to the housing 11 while being housed in the internal housing space 11a. Although not shown, the sound generation device 10 also includes an electric board on which an electric circuit for controlling the sound generation by the speaker 16 is formed, and the electric board is also housed in the internal housing space 11a and fixed to the housing 11.

[0018] The housing internal space 11a is open to one side in the first direction D1. That is, the housing 11 has a housing opening 12 in which a housing opening 12a that opens toward one side in the first direction D1 is formed. The housing opening 12a is connected to the housing internal space 11a, and the housing internal space 11a is open via the housing opening 12a.

[0019] Furthermore, the housing 11 is disposed on the other side of the undercover 60 in the first direction D1 and is fixed to the undercover 60. For example, the housing 11 is directly fixed to the undercover 60 by screwing or the like. Specifically, the housing 11 is fixed to the undercover 60 so that the housing opening 12a overlaps with the other side of the cover sound emission hole 60a in the first direction D1.

[0020] The speaker 16 is a sound-producing body that emits sound in accordance with an electrical signal input to the speaker 16. The speaker 16 is disposed on the other side of the housing opening 12a in the first direction D1, and is fixed to the housing 11 in a position facing one side of the first direction D1, i.e., facing the housing opening 12a.

[0021] The speaker 16 also has a diaphragm 161 that vibrates to emit sound toward the housing opening 12a, and a driver 162 that vibrates the diaphragm 161 in accordance with an electrical signal input from an electrical board.

[0022] The diaphragm 161 is a film-like member that faces one side in the first direction D1 and emits sound, and is made of, for example, paper or a film-like resin. The diaphragm 161 is formed so as to expand in the second direction D2 and the third direction D3, and is formed in a substantially disk shape when viewed in the direction along the first direction D1. Specifically, the diaphragm 161 is configured to include a hollow truncated cone-shaped outer peripheral portion that expands in diameter toward one side in the first direction D1, and a dome-shaped inner peripheral portion that is convex toward one side in the first direction D1. In addition, a drive unit 162 that is arranged on the other side of the diaphragm 161 in the first direction D1 is connected to the diaphragm 161.

[0023] The driving unit 162 of the speaker 16 has an electromagnetic coil, a magnetic circuit, etc. The electromagnetic coil of the driving unit 162 is electrically connected to the electric circuit of the electric board via a connection terminal of the speaker 16. When electricity is applied to the electromagnetic coil, the driving unit 162 vibrates the diaphragm 161 in the first direction D1, thereby generating sound from the diaphragm 161.

[0024] 2 to 4, each of the housing fins 24 has a plate shape extending in the second direction D2, is provided in the housing opening 12a, and is fixed to the housing 11. Each of the housing fins 24 is inclined with respect to the first direction D1 so that it is positioned closer to one side of the third direction D3 as it approaches one side of the first direction D1. For example, the housing fins 24 are made of resin, and are molded integrally with a component of the housing 11 including the housing opening 12.

[0025] The multiple housing fins 24 are arranged side by side with mutual gaps 24a in the third direction D3. These mutual gaps 24a between the housing fins 24 are sometimes referred to as housing fin mutual gaps 24a. A plurality of housing fin mutual gaps 24a are formed, and each of the multiple housing fin mutual gaps 24a serves as a passage that allows air to flow along the housing fin 24 adjacent to each other across the housing fin mutual gap 24a. Each of the multiple housing fin mutual gaps 24a is open to one side and the other side in the first direction D1.

[0026] The undercover 60 has a plurality of sound output hole fins 61 provided in the cover sound output holes 60a. The plurality of sound output hole fins 61 are provided so as to correspond one-to-one with the plurality of housing fins 24, for example, and therefore the number of the sound output hole fins 61 is the same as the number of the housing fins 24.

[0027] Each of the multiple sound output hole fins 61 has a plate shape extending in the second direction D2 and is fixed to the undercover 60 at the peripheral edge of the cover sound output hole 60a. Each of the multiple sound output hole fins 61 is inclined with respect to the first direction D1 so that it is positioned closer to one side in the first direction D1 and closer to the other side in the third direction D3. For example, the undercover 60 is integrally molded with the multiple sound output hole fins 61, and the undercover 60 and the multiple sound output hole fins 61 form a single resin part.

[0028] The multiple sound output hole fins 61 are arranged side by side with mutual gaps 61a in the third direction D3. These mutual gaps 61a between the sound output hole fins 61 are sometimes referred to as sound output hole fin mutual gaps 61a. A plurality of sound output hole fin mutual gaps 61a are formed. More specifically, the same number of sound output hole fin mutual gaps 61a as the housing mutual fin mutual gaps 24a are formed. Like the housing mutual fin mutual gaps 24a, each of the multiple sound output hole fin mutual gaps 61a serves as a passage that allows air to flow along the sound output hole fins 61 adjacent to each other with the sound output hole fin mutual gap 61a in between. Each of the multiple sound output hole fin mutual gaps 61a is open to one side and the other side in the first direction D1.

[0029] Specifically, the following can be said regarding the arrangement of the multiple housing fins 24 and the multiple sound output hole fins 61. That is, since the multiple housing fins 24 are arranged on the other side in the first direction D1 of the multiple sound output hole fins 61, the multiple housing fin inter-gaps 24a are also arranged on the other side in the first direction D1 of the multiple sound output hole fin inter-gaps 61a. The multiple housing fin inter-gaps 24a are each connected to the multiple sound output hole fin inter-gaps 61a from the other side in the first direction D1.

[0030] That is, the multiple housing fins 24 and the multiple sound output hole fins 61 form multiple sound passages 62 each made up of interconnected housing fin gaps 24a and sound output hole fin gaps 61a. In a vertical cross section parallel to the first direction D1 and the third direction D3 (for example, the cross section in FIG. 2), each of the multiple sound passages 62 is an L-shaped passage bent at the connection point between the housing fin gaps 24a and the sound output hole fin gaps 61a.

[0031] Each of the sound passages 62 propagates sound emitted by the speaker 16 toward the other side of the undercover 60 in the first direction D1, as indicated by the arrows As in FIG. 2 . Furthermore, because each of the sound passages 62 is bent in an L-shape as described above, the diaphragm 161 of the speaker 16 is not visible through the cover sound emission hole 60a from one side of the cover sound emission hole 60a in the first direction D1. In other words, the diaphragm 161 of the speaker 16 is not visible through the sound emission hole fin inter-gaps 61a from one side of the cover sound emission hole 60a in the first direction D1. For example, the housing fins 24 are visible from one side of the first direction D1 through the sound emission hole fin inter-gaps 61a, but the diaphragm 161 of the speaker 16 is blocked by the housing fins 24 and is not visible. The housing fins 24 and the sound emission hole fins 61 are arranged as described above.

[0032] In FIG. 2, a small gap is formed between the housing fins 24 and the sound output hole fins 61 that are aligned in the first direction D1, but the small gap may not exist and the housing fins 24 and the sound output hole fins 61 that are aligned in the first direction D1 may be in contact with each other.

[0033] Here, a sound generation device 90 of a comparative example, which is to be compared with the sound generation device 10 of this embodiment, will be described. In this comparative example, the sound generation device 90 does not have the housing fins 24 (see FIG. 2) as shown in FIG. 5, and the undercover 60 to which the sound generation device 90 is attached does not have the sound output hole fins 61. Instead, in the comparative example, the housing 92 that houses the speaker 16 is different from that of this embodiment. Specifically, the housing 92 of the sound generation device 90 of the comparative example has a base 921 and a cover 922.

[0034] In the comparative example, base 921 is formed to cover one side of speaker 16 in first direction D1, and cover 922 is further layered on base 921 to cover one side of base 921 in first direction D1. With this configuration, sound path 92a is formed through which sound emitted by speaker 16 propagates to the outside of housing 92 as indicated by arrow A1, and sound path 92a has a complex labyrinth structure that prevents water from entering housing 92 from the outside. That is, in the comparative example, multiple components included in housing 92 are layered in two layers to form sound path 92a into a labyrinth structure.

[0035] In contrast, according to the present embodiment, as shown in FIGS. 2 to 4, the sound generation device 10 includes a plurality of housing fins 24 provided in the housing opening 12a. The plurality of housing fins 24 each have a plate shape extending in the second direction D2, are aligned with housing fin gaps 24a in the third direction D3, and are inclined with respect to the first direction D1 so that one side of the first direction D1 is positioned closer to one side of the third direction D3. The undercover 60 to which the sound generation device 10 is attached has a plurality of sound output hole fins 61 provided in the cover sound output holes 60a. The plurality of sound output hole fins 61 each have a plate shape extending in the second direction D2, are aligned with housing fin gaps 61a in the third direction D3, and are inclined with respect to the first direction D1 so that one side of the first direction D1 is positioned closer to the other side of the third direction D3. Furthermore, the multiple housing fins 24 are arranged so that the housing fin inter-gaps 24a are each connected to the sound emission hole fin inter-gaps 61a and the vibration plate 161 cannot be seen through the cover sound emission hole 60a from one side of the first direction D1 relative to the cover sound emission hole 60a.

[0036] Therefore, it is possible to prevent the diaphragm 161 of the speaker 16 from being exposed to one side of the cover sound emission hole 60a in the first direction D1. As a result, even if foreign matter such as water or pebbles gets on or around the cover sound emission hole 60a as shown by arrow B due to, for example, a high-pressure car wash or pitting, it is possible to prevent the foreign matter from entering the housing interior space 11a. In other words, it is possible to protect the speaker 16 from high-pressure car washes, pitting, and the like.

[0037] Furthermore, the undercover 60, which is the counterpart part to which the sound generation device 10 is attached, is used to prevent exposure of the diaphragm 161 of the speaker 16, so compared to the comparative example, the sound generation device 10 of this embodiment can suppress an increase in the number of parts required to prevent exposure of the diaphragm 161. At the same time, because the undercover 60 is integrally molded with the multiple sound output hole fins 61, there is no concern that the provision of the sound output hole fins 61 will increase the number of parts.

[0038] Furthermore, in this embodiment, the undercover 60 is used to form the multiple sound passages 62, such as the portion that is connected to the housing 11 of the sound generation device 10. Therefore, compared to, for example, a case in which the undercover 60 is not provided with sound release hole fins 61 and the multiple sound passages 62 are all formed in the housing 11, it is possible to increase the volume of the sound passages 62 while minimizing the increase in the size of the sound generation device 10. These sound passages 62 also function as resonance spaces that amplify sound, so by increasing the volume of the sound passages 62, it is possible to aim to amplify the sound pressure.

[0039] Furthermore, the sound emitted from the speaker 16 is dispersed to the outside from the plurality of sound passages 62 in a direction along the plurality of sound emission hole fins 61 as indicated by the arrows As, thereby improving the directionality of the sound emitted to the outside from the sound generation device 10. For example, in this embodiment, as indicated by the arrows As, the sound emitted from the speaker 16 is dispersed from the sound passages 62 downward in the vehicle direction and diagonally forward in the vehicle direction.

[0040] Furthermore, according to this embodiment, the housing 11 is fixed to the undercover 60. Therefore, the housing fins 24 can be positioned with high precision relative to the sound output hole fins 61, and therefore, variation in the size of the sound passage 62 can be reduced.

[0041] (Other embodiments) (1) In the above-described embodiment, as shown in Figures 1 and 2, the attachment member to which the sound generation device 10 is attached is the undercover 60 of the vehicle 80, but the attachment member may be another part other than the undercover 60.

[0042] (2) In the above embodiment, as shown in Fig. 2, the first direction D1 corresponds to the vehicle up-down direction Dz, the second direction D2 corresponds to the vehicle left-right direction Dx, and the third direction D3 corresponds to the vehicle front-rear direction Dy, but this is just an example. Various orientations of the sound generation device 10 are possible, and for example, the sound generation device 10 may be attached to a component other than the undercover 60, with the speaker 16 facing forward or backward in the vehicle direction.

[0043] (3) Note that the present disclosure is not limited to the above-described embodiment and can be implemented in various modifications. Furthermore, it goes without saying that the elements constituting the above-described embodiment are not necessarily essential unless they are specifically stated as essential or are clearly considered essential in principle.

[0044] Furthermore, in the above embodiments, when numerical values ​​such as the number, values, amounts, and ranges of components of the embodiments are mentioned, they are not limited to the specific numbers, except when it is particularly clearly stated that they are essential or when they are clearly limited to a specific number in principle, etc. Furthermore, in the above embodiments, when the materials, shapes, positional relationships, etc. of components are mentioned, they are not limited to the materials, shapes, positional relationships, etc., except when it is particularly clearly stated or when they are clearly limited to a specific material, shape, positional relationship, etc. in principle, etc. [Explanation of symbols]

[0045] 10 Sound generating device 11. Housing 12 Housing opening 12a Housing opening 16 speakers 24 Housing fins 60 Undercover (mounting part) 60a Cover sound emitting hole (sound emitting hole) 61 Sound hole fin 161 Diaphragm

Claims

[Claim 1] A sound-generating device that is attached to a workpiece (60) and emits sound through a sound-emitting hole (60a) that penetrates the workpiece from one side to the other side in a first direction (D1), a housing (11) having a housing opening (12) in which a housing opening (12a) opening toward the one side in the first direction is formed, the housing (11) being disposed on the other side in the first direction with respect to the mounting member, and fixed to the mounting member so that the housing opening overlaps with the other side in the first direction with respect to the sound emission hole; a speaker (16) housed in the housing and having a diaphragm (161) that vibrates to emit sound toward the housing opening; a plurality of housing fins (24) that are provided in the housing opening and fixed to the housing, extend in a second direction (D2) perpendicular to the first direction, are arranged with mutual gaps (24a) in between in a third direction (D3) perpendicular to the first and second directions, and are plate-shaped and inclined with respect to the first direction so that the one side in the first direction is closer to the one side in the third direction; The mounting member has a plurality of sound emitting hole fins (61), The plurality of sound output hole fins extend in the second direction, are arranged in the third direction with mutual gaps (61 a) therebetween, are provided in the sound output holes, and have a plate shape inclined with respect to the first direction so that one side in the first direction is positioned closer to the other side in the third direction, A sound-generating device in which the multiple housing fins are arranged so that the mutual gaps of the multiple housing fins are each connected to the mutual gaps of the multiple sound output hole fins from the other side in the first direction, and the vibration plate is not visible through the sound output hole from the one side in the first direction relative to the sound output hole.

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