Sound production device

Abstract

To provide a sound production device capable of urging air-cooling on an electric board by generating an air flow on the electric board with the use of a vibration of a diaphragm of a speaker.SOLUTION: A frame hole 21a of a speaker frame 21 is arranged to be overlapped on the other side of a shaft center axial direction Da with respect to a diaphragm 24. An in-frame space 21b between the speaker frame 21 and the diaphragm 24 is opened toward the other side of the shaft center axial direction Da by the frame hole 21a. An inclined blade 214 of the speaker frame 21 has a plate shape extending in a shaft center radial direction Dr, is arranged in the frame hole 21a, and is inclined with respect to the shaft center axial direction Da so as to allow the other side of the shaft center axial direction Da to be positioned at one side of a shaft center circumferential direction Dc. Thus, an air flow due to the vibration of the diaphragm 24 can be guided to be directed to the one side of the shaft center circumferential direction Dc along the inclined blade 214. Then, air-cooling on an electric board 26 is urged by the air flow.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a sound generating device that includes a speaker and an electrical component. [Background technology]

[0002] A conventional sound generating device of this type is disclosed in Patent Document 1, for example. The sound generating device disclosed in Patent Document 1 includes a speaker, a circuit board on which a circuit for driving the speaker's drive unit is formed and electronic components are mounted, and a housing that houses the speaker and the circuit board. Within the housing, the circuit board is disposed behind the speaker with a gap between them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2022-139884 Summary of the Invention [Problem to be solved by the invention]

[0004] In the sound generator of Patent Document 1, the temperature inside the housing is prone to becoming high due to heat generated by the electronic components and speaker mounted on the board when power is applied, as well as the influence of the ambient temperature around the sound generator. Therefore, it was necessary to increase the distance between the speaker and the board in order to adequately dissipate heat from around the electronic components on the board. Increasing the distance between the speaker and the board in this way hinders miniaturization of the sound generator. The inventors' detailed investigation led to the above findings.

[0005] In view of the above, the present disclosure aims to provide a sound generating device that can promote air cooling on an electrical board by using the vibration of a speaker's diaphragm to generate air flow on the electrical board. [Means for solving the problem]

[0006] In order to achieve the above object, a sound generating device according to one aspect of the present disclosure comprises: a speaker (20) having a diaphragm (24) formed so as to expand in a radial direction (Dr) of an axial center (CL) and to emit sound toward one side in an axial direction (Da) of the axial center, and a speaker frame (21) formed so as to cover the other side of the diaphragm in the axial direction and to which a peripheral portion (24a) of the diaphragm is connected; an electric board (26) that is provided so as to overlap the other side of the speaker frame in the axial direction and has a plate shape with its thickness direction in the axial direction; A housing (11) that houses a speaker and an electric board, The speaker frame has a frame hole (21a) formed therethrough, The frame hole opens the space (21b) between the speaker frame and the diaphragm to the other side in the axial direction, The speaker frame has an inclined blade (214) formed in a plate shape extending in the radial direction and disposed in a frame hole, The inclined blade is inclined with respect to the axial direction so that it is positioned on one side of the circumferential direction (Dc) of the axis toward the other side in the axial direction.

[0007] With this configuration, when the speaker diaphragm vibrates to produce sound, air flows from the frame hole toward the electric board. This air flows along the inclined blades as it passes through the frame hole and flows out toward the electric board, so it is guided to one side in the circumferential direction above the electric board. This airflow from the frame hole therefore circulates air within the housing, promoting air cooling above the electric board.

[0008] 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]

[0009] [Figure 1] FIG. 1 is a front view of a sound generation device according to a first embodiment. [Figure 2] 2 is a cross-sectional view showing the sound generation device in a vertical cross section including the axis of the device in the first embodiment, specifically a cross-sectional view showing the II-II cross section in FIG. 1. FIG. [Figure 3] 3 is a cross-sectional view showing the speaker arranged in the housing of the sound generation device in the first embodiment, viewed from the other side in the axial direction, specifically a cross-sectional view showing the III-III cross section in FIG. 2. FIG. [Figure 4] 4 is a cross-sectional view showing the sound generation device in a vertical cross section oriented in a different direction from that of FIG. 2 in the first embodiment, specifically a cross-sectional view showing the IV-IV cross section of FIG. 3. FIG. [Figure 5] 1 is a perspective view showing a speaker provided in the sound generation device of the first embodiment by itself; [Figure 6] FIG. 6 is a perspective view showing the speaker alone from the opposite side to that of FIG. 5. [Figure 7] 7 is a cross-sectional view of a frame hole formed in the speaker frame in the first embodiment, and is a schematic diagram showing a cross section taken along line VII-VII in FIG. 3 developed on a plane. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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.

[0011] (First embodiment) The sound generation device 10 of this embodiment is mounted on an automobile, for example, installed outside the passenger compartment of the automobile, and used to generate an alarm sound. In the following description, an automobile may also be simply referred to as a vehicle.

[0012] As shown in FIGS. 1 and 2, for convenience, the description of this embodiment assumes a single axis, i.e., a device axis CL. The axial direction Da of the device axis CL is also referred to as the axial direction Da, the radial direction Dr of the device axis CL is also referred to as the axial radial direction Dr, and the circumferential direction Dc of the device axis CL is also referred to as the axial circumferential direction Dc. The axial direction Da is parallel to the device axis CL. The axial radial direction Dr is a direction perpendicular to the device axis CL and away from the device axis CL. That is, the axial radial direction Dr is the radial direction of a circle drawn on a virtual plane perpendicular to the device axis CL, with the intersection of the device axis CL and the device axis CL as its center. The axial circumferential direction Dc is the circumferential direction of the circle drawn on the virtual plane. In FIG. 2, one side of the axial direction Da is the left side of the paper, and the other side of the axial direction Da is the right side of the paper.

[0013] As shown in FIGS. 1 to 4, the sound generation device 10 includes a housing 11, a speaker 20, and an electric board .

[0014] The housing 11 is a component that forms the outer shell of the sound generation device 10 and is made of, for example, resin. The housing 11 has a housing main body 12 and a connector 13, and the housing main body 12 and the connector 13 are integrally configured. The housing main body 12 is configured by joining together a plurality of resin components, and is formed as a hollow box having a substantially rectangular parallelepiped shape. An internal housing space 12a is formed inside the housing main body 12. The internal housing space 12a houses a speaker 20 and an electric board 26, and the speaker 20 and the electric board 26 are fixed to the housing main body 12 while housed in the internal housing space 12a.

[0015] Furthermore, a sound emission hole 12b is formed in the housing main body 12 on one side in the axial direction Da, through which sound emitted by the speaker 20 is emitted to the outside of the housing 11. This sound emission hole 12b serves as a passage that connects the housing internal space 12a with the outside of the housing 11, and is open to one side in the axial direction Da relative to the housing main body 12. In other words, the sound emission hole 12b functions as a sound passage that propagates the sound emitted by the speaker 20 to the outside of the housing 11. However, the sound emission hole 12b has a complex labyrinth structure that prevents water from entering the housing internal space 12a from the outside of the housing 11.

[0016] The connector portion 13 of the housing 11 is provided as a connecting portion for electrically connecting the outside of the sound generation device 10 with the electric board 26. For example, the connector portion 13 is integrally molded with one of the multiple components constituting the housing main body 12. Specifically, the connector portion 13 is formed in a substantially rectangular tubular shape that protrudes from the housing main body 12 in a connector protrusion direction Dy perpendicular to the axial direction Da, and opens toward the connector protrusion direction Dy. The connector portion 13 is provided with multiple male terminals (not shown) that protrude from the housing main body 12 in the connector protrusion direction Dy. The multiple male terminals penetrate the side walls of the housing main body 12 into the housing interior space 12a and are connected to the electric board 26 by soldering or the like.

[0017] The speaker 20 is a sound-producing body that emits sound in accordance with an electrical signal input to the speaker 20. As shown in Figures 2, 5, and 6, the speaker 20 has a speaker frame 21, a diaphragm 24, and a drive unit 25. The speaker 20 is positioned facing one side of the axial direction Da, with the device axis CL being at the center of the speaker 20.

[0018] The speaker frame 21 supports the diaphragm 24 and the driving section 25. For example, the speaker frame 21 is made of resin.

[0019] The speaker frame 21 has a generally circular shape centered on the device axis CL when viewed in the axial direction Da, and is formed into a cylindrical shape with an inclined sidewall 211 that is inclined so that the diameter increases toward one side in the axial direction Da. An opening formed in the center of the speaker frame 21 on the other side in the axial direction Da is closed by the driver 25.

[0020] More specifically, the speaker frame 21 has an other-side opening forming portion 212 that forms an opening on the inside that is closed by the drive unit 25. This other-side opening forming portion 212 has a cylindrical shape centered on the device axis CL and protrudes to the other side in the axial direction Da of the speaker frame 21. The other-side opening forming portion 212 and the drive unit 25 form the other-side protruding portion 201 of the speaker 20 that protrudes to the other side.

[0021] An opening on one side of the speaker frame 21 in the axial direction Da is closed by the diaphragm 24. That is, the speaker frame 21 is formed so as to cover the other side of the diaphragm 24 in the axial direction Da.

[0022] The diaphragm 24 is a film-like member that emits sound facing one side in the axial direction Da, and is made of, for example, paper or film-like resin. The diaphragm 24 is formed so as to expand in the axial radial direction Dr from the device axis CL, forming a substantially disk-like shape. Specifically, the diaphragm 24 includes a hollow truncated cone-shaped outer peripheral portion that expands in diameter toward one side in the axial direction Da, and a dome-shaped inner peripheral portion that convex toward one side in the axial direction Da. The diaphragm 24 is connected and bonded to the speaker frame 21 at a peripheral portion 24a of the diaphragm 24. A driver 25, located on the other side of the diaphragm 24 in the axial direction Da, is also connected to the diaphragm 24.

[0023] The driving unit 25 of the speaker 20 has an electromagnetic coil, a magnetic circuit, etc. The electromagnetic coil of the driving unit 25 is electrically connected to an electric board 26 via a connection terminal 202 of the speaker 20. When a current is applied to the electromagnetic coil, the driving unit 25 vibrates the diaphragm 24 in the axial direction Da, thereby generating sound from the diaphragm 24.

[0024] 2 to 4, the electric board 26 has a rectangular flat plate shape with its thickness direction aligned with the axial direction Da. Specifically, the electric board 26 is a printed circuit board on which a circuit pattern is formed using copper foil or the like. For example, the housing main body 12 has a plurality of board support parts 121 formed in a columnar shape and protruding into the housing interior space 12a, and the electric board 26 is screwed to the plurality of board support parts 121. In this way, the electric board 26 is fixed to the housing main body 12.

[0025] The electric board 26 is provided on the other side in the axial direction Da with a gap between it and the speaker 20. In detail, the electric board 26 is provided so as to overlap the speaker frame 21 on the other side in the axial direction Da.

[0026] The flat electric board 26 has a first surface 26a formed on one side in the axial direction Da and a second surface 26b formed on the other side in the axial direction Da. A plurality of electronic components, such as resistors, capacitors, and an IC 261, are mounted on each of the first surface 26a and the second surface 26b of the electric board 26. These electronic components form an electric circuit for supplying electricity to the driver 25 of the speaker 20, for example. Note that FIG. 4 illustrates an IC 261, one of the electronic components mounted on the electric board 26. IC stands for Integrated Circuit.

[0027] The speaker frame 21 has a plurality of frame holes 21a formed therethrough. More specifically, the plurality of frame holes 21a are formed in the inclined side walls 211 of the speaker frame 21.

[0028] In this embodiment, for example, five frame holes 21a are provided. The frame holes 21a are arranged at intervals in the axial circumferential direction Dc around the device axis CL. Each of the frame holes 21a is arranged to overlap the other side of the diaphragm 24 in the axial direction Da, opening the frame interior space 21b, which is the space between the speaker frame 21 and the diaphragm 24, to the other side in the axial direction Da. Each of the frame holes 21a is arranged to overlap one side of the electric board 26 in the axial direction Da.

[0029] The speaker frame 21 has a plurality of inclined vanes 214. A plurality of the inclined vanes 214 (specifically, three vanes for each) are provided in each of the plurality of frame holes 21a. Each of the plurality of inclined vanes 214 has a plate shape and extends in a diagonal axis radial direction Dr inclined with respect to the device axis CL so as to follow the inclination of the inclined side wall 211.

[0030] 2, 3, and 7, the inclined blades 214 are arranged at intervals in the circumferential direction Dc of the axis in each frame hole 21a. That is, the inclined blades 214 are arranged so as to divide the frame hole 21a in which the inclined blade 214 is provided in the circumferential direction Dc of the axis.

[0031] Each of the multiple inclined vanes 214 is inclined with respect to the axial direction Da so that it is positioned closer to one side of the axial circumferential direction Dc as it moves toward the other side of the axial direction Da. In other words, each of the multiple inclined vanes 214 is inclined with respect to the axial direction Da so that it is positioned closer to one side of the axial circumferential direction Dc as it moves from the intra-frame space 21b side toward the outside of the speaker frame 21. The posture of each of the inclined vanes 214 is the same.

[0032] The cross-sectional position where the cross section of Fig. 7 is formed is represented by cross-sectional line VIIa-VIIa in Fig. 2. In Fig. 7, the inside of speaker frame 21 relative to inclined vane 214, i.e., the diaphragm 24 side, is on the upper side of the paper, and the outside of speaker frame 21 relative to inclined vane 214 is on the lower side of the paper.

[0033] The other-side protrusion 201 of the speaker 20 protrudes to the other side in the axial direction Da from the portion of the speaker frame 21 where the frame hole 21a is formed. The frame holes 21a and the inclined blades 214 are each disposed outside the other-side protrusion 201 in the axial radial direction Dr, and are aligned in the circumferential direction Dc of the shaft so as to surround the other-side protrusion 201.

[0034] The effects of this embodiment will be described. As described above, according to this embodiment, as shown in Figures 2, 3, and 7, the frame hole 21a of the speaker frame 21 opens the frame space 21b between the speaker frame 21 and the diaphragm 24 to the other side in the axial direction Da. The inclined vanes 214 of the speaker frame 21 have a plate shape extending in the axial radial direction Dr, are arranged in the frame hole 21a, and are inclined with respect to the axial direction Da so as to be positioned on one side in the axial circumferential direction Dc as they move toward the other side in the axial direction Da.

[0035] With this configuration, when the diaphragm 24 of the speaker 20 vibrates to produce sound, an airflow is generated from the frame hole 21a toward the electric board 26. Then, as the airflow passes through the frame hole 21a, it flows out toward the electric board 26 along the inclined blades 214, and is guided on one surface 26a of the electric board 26 to one side in the axial circumferential direction Dc.

[0036] Therefore, the airflow generated by the vibration of diaphragm 24 can circulate air within housing space 12a, and as a result, air heated by electronic components such as IC 261 is less likely to stagnate between speaker 20 and electric board 26. In other words, the airflow generated by the vibration of diaphragm 24 can promote air cooling of electric board 26 and the electronic components mounted on electric board 26. This in turn makes it possible to reduce the clearance in the axial direction Da required for heat dissipation from the electronic components between speaker 20 and electric board 26, allowing for the sound generation device 10 to be made more compact.

[0037] (1) According to this embodiment, a plurality of frame holes 21a are provided, and the plurality of frame holes 21a are arranged at intervals in the axial circumferential direction Dc around the device axis CL. A plurality of inclined blades 214 are provided in each of the plurality of frame holes 21a.

[0038] Therefore, the airflow passing through frame hole 21a can be guided so as to be sandwiched between inclined blades 214, making it easier to guide the airflow toward one side in the axial circumferential direction Dc. Furthermore, the airflow guided toward one side in the axial circumferential direction Dc is blown out at multiple locations around device axis CL, making it possible to form an airflow between speaker 20 and electric board 26 that circulates around device axis CL so as to swirl toward one side in the axial circumferential direction Dc. As a result, air cooling of electric board 26 and the electronic components mounted on electric board 26 can be promoted over a wide area above electric board 26.

[0039] (Other embodiments) (1) In the above embodiment, as shown in Fig. 3, the speaker frame 21 has a plurality of frame holes 21a, but the number of frame holes 21a may be one. Also, the speaker frame 21 has a plurality of inclined blades 214, but the number of inclined blades 214 may be one.

[0040] (2) 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.

[0041] 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]

[0042] 11. Housing 20 speakers 21 Speaker frame 24 Diaphragm 26 Electrical Board 21a Frame hole 214 Inclined Wing Da Axial center Axial direction Dc axis circumferential direction Dr shaft center radial direction

Claims

1. A sound-producing device, comprising: a speaker (20) having a diaphragm (24) formed so as to expand in a radial direction (Dr) of an axial center (CL) and to emit sound toward one side in an axial direction (Da) of the axial center, and a speaker frame (21) formed so as to cover the other side of the diaphragm in the axial direction and to which a peripheral portion (24a) of the diaphragm is connected; an electric board (26) that is provided so as to overlap the other side of the speaker frame in the axial direction and has a plate shape with the axial direction as a thickness direction; a housing (11) that houses the speaker and the electric board; The speaker frame has a frame hole (21a) formed therethrough, The frame hole opens a space (21b) between the speaker frame and the diaphragm to the other side in the axial direction, The speaker frame has an inclined blade (214) formed in a plate shape extending in the radial direction and disposed in the frame hole, The inclined blade is inclined with respect to the axial direction so that it is positioned on one side of the circumferential direction (Dc) of the single axis toward the other side in the axial direction.

2. A plurality of the frame holes are provided, The plurality of frame holes are arranged at intervals in the circumferential direction around the axis, The sound generating device according to claim 1 , wherein a plurality of the inclined blades are provided for each of the plurality of frame holes.

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