Speaker device and vehicle

Abstract

To provide a speaker device capable of suppressing the transmission of vibration from a speaker unit to a mounting target member.SOLUTION: A speaker device includes a speaker unit and a spring member connecting the speaker unit to either a mounting target member or a mounting member mounted to the mounting target member, and a spring constant k1 of the spring member in the central axis direction of the speaker unit is lower than a spring constant k2 of the spring member in a direction perpendicular to the central axis direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a speaker device and a vehicle. [Background technology]

[0002] Some speakers have an inner box and an outer box, and a coil-shaped spring member is interposed between the inner box and the outer box (see, for example, Patent Document 1). There are also speakers in which a sealant and a sealing material are arranged around the sound emitting surface of the speaker unit. This speaker is attached to a surface member provided on the door trim via the sealant and the sealing material (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6424963 specification [Patent Document 2] Japanese Patent Application Publication No. 10-210582 Summary of the Invention [Problem to be solved by the invention]

[0004] The vibration of the speaker may be transmitted to the mounting target member via the speaker frame. This may cause the mounting target member to resonate or generate abnormal noise due to chatter. The present disclosure suppresses the vibration of the speaker unit from being transmitted from the speaker frame to the mounting target member. [Means for solving the problem]

[0005] The speaker device of the present disclosure comprises a speaker unit, and a spring member connecting the speaker unit to either a mounting target member or a mounting member mounted to the mounting target member, and a spring constant k1 of the spring member in a central axis direction of the speaker unit is lower than a spring constant k2 of the spring member in a direction perpendicular to the central axis direction.

[0006] A vehicle according to the present disclosure includes the above-described speaker device and a panel member having an opening formed therein, and the speaker device is held in the opening. [Brief description of the drawings]

[0007] [Figure 1] 1 is a front view of a speaker device according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the speaker device. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] 1 is an exploded perspective view showing a vehicle door equipped with a speaker device; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that the dimensions and scale of each part in the drawings are appropriately different from the actual ones. In addition, the embodiment described below is a preferred specific example of the present disclosure. Therefore, various technically preferable limitations are attached to this embodiment. However, the scope of the present disclosure is not limited to these forms unless otherwise specified in the following description to limit the present disclosure.

[0009] Fig. 1 is a front view of a speaker device 1 according to an embodiment. Fig. 2 is a cross-sectional view of the speaker device 1. The speaker device 1 shown in Fig. 1 and Fig. 2 is used as an in-vehicle speaker device mounted on a vehicle such as an automobile, for example, as shown in Fig. 5.

[0010] The speaker device 1 may be attached to a vehicle door via an inner panel, which is an attachment target member 50, for example. The use of the speaker device 1 is not limited to in-vehicle use, and may be for other purposes. The attachment target member 50 to which the speaker device 1 is attached is not limited to an inner panel. The attachment target member 50 may be other members such as a door trim. The attachment target member 50 has an opening formed therein in which the speaker device 1 is held. For example, the speaker device 1 is fixed to a peripheral portion surrounding the opening via an attachment member 40, which will be described later.

[0011] FIG. 2 shows a cross section of a part of the speaker device 1. This cross section is taken along the axis O of the speaker unit 2. The axis O is a line segment that is parallel to the vibration direction of the diaphragm 3, which will be described later, and passes through the center of the diaphragm 3. The direction that intersects with the axis O is the radial direction Y of the speaker unit 2. In the direction of the axis O, the side on which the diaphragm 3 is arranged is the front side, and the opposite side is the back side B. The front side is the sound-emitting surface side F. The axis O of the speaker unit 2 is the axis O of the magnetic circuit 6, which will be described later.

[0012] The speaker device 1 includes a speaker unit 2. The speaker unit 2 has a diaphragm 3, a driving section 4, and a speaker frame 5, and is a structure in which these are unitized.

[0013] The diaphragm 3 is a vibrating body made of a sheet material that emits sound by vibration. The sheet material is obtained, for example, by impregnating a fiber base material with a resin material and then curing or solidifying the resin material. Examples of the resin material include acrylic resin, polyurethane, melamine resin, modified rubber resin, and phenolic resin. Examples of the fiber base material include carbon fiber, aramid fiber, glass fiber, ceramic fiber, silica fiber, metal fiber, potassium titanate fiber, zirconia fiber, polyacrylate fiber, polyphenylene sulfide fiber, vinylon fiber, rayon fiber, nylon fiber, polyester fiber, acrylic fiber, polypropylene fiber, polyethylene fiber, cotton fiber, hemp fiber, and cellulose fiber.

[0014] The diaphragm 3 vibrates in a direction along the axis O. The diaphragm 3 is cone-shaped. Note that the shape of the diaphragm 3 is not limited to the cone shape, and may be, for example, a dome shape.

[0015] The driving unit 4 is a mechanism that drives the diaphragm 3 based on an input electric signal. The driving unit 4 includes a magnetic circuit 6 that generates a magnetic field, and a voice coil 7 that is connected to the diaphragm 3.

[0016] The magnetic circuit 6 includes a magnet 8, a yoke 9, and a center pole 10. The magnet 8, the yoke 9, and the center pole 10 are arranged on the back side B of the diaphragm 3 in the direction of the axis O. The magnet 8, the yoke 9, and the center pole 10 are arranged coaxially with the axis O. The magnet 8 is annular, the yoke 9 is disk-shaped, and the center pole 10 is cylindrical. The yoke 9 and the center pole 10 are made of magnetic materials.

[0017] The magnetic flux generated from the magnet 8 passes through the yoke 9 and the center pole 10. The magnetic flux passing through the magnetic circuit 6 forms a magnetic field around the magnetic circuit 6. The voice coil 7 is disposed within the magnetic field generated by the magnetic circuit 6.

[0018] The speaker unit 2 includes a bobbin 11 around which a voice coil 7 is wound. The bobbin 11 includes a cylindrical portion 11a and a center cap 11b. The center cap 11b closes the opening on the front side of the cylindrical portion 11a. The voice coil 7 is wound around the outer circumferential surface of the cylindrical portion 11a of the bobbin 11.

[0019] The diaphragm 3 is formed around the center cap 11b when viewed from the direction of the axis O. An inner periphery 3a of the diaphragm 3 is connected to an outer periphery of the center cap 11b.

[0020] The speaker unit 2 has an elastic edge portion 12. When viewed from the direction of the axis O, the edge portion 12 is ring-shaped and is provided along the outer periphery 3b of the diaphragm 3. The outer periphery 3b of the diaphragm 3 is connected to the edge portion 12. The diaphragm 3 is connected to the speaker frame 5 via the edge portion 12.

[0021] The speaker frame 5 holds the diaphragm 3 and the magnetic circuit 6. The speaker frame 5 is made of iron or a metal material, or a resin material. The shape of the speaker frame 5 is not limited to the shape shown in FIG. 2 and may be any shape as long as it can hold the diaphragm 3 and the magnetic circuit 6.

[0022] The speaker frame 5 includes a cone portion 13, a magnetic circuit housing portion 14, and a flange 15. The cone portion 13 is formed so as to cover the diaphragm 3 from the outside in the radial direction Y. The magnetic circuit housing portion 14 is disposed on the back side B of the cone portion 13 in the direction of the axis O. The magnetic circuit housing portion 14 houses the magnet 8 and the yoke 9 of the magnetic circuit 6. The back side B portion of the center pole 10 is housed in the magnetic circuit housing portion 14. The sound emitting surface side F portion of the center pole 10 extends into the cone portion 13. The magnetic circuit housing portion 14 houses a part of the magnetic circuit 6.

[0023] The flange 15 protrudes outward in the radial direction Y from the end of the sound emitting surface side F of the cone portion 13. The flange 15 has an annular shape when viewed from the axis O direction.

[0024] The speaker unit 2 includes an intermediate frame 20 connected to the speaker frame 5. The intermediate frame 20 is disposed outside the cone portion 13 in the radial direction Y. The intermediate frame 20 has, for example, a circular ring shape when viewed from the axis O direction. The intermediate frame 20 may include, for example, a cylindrical body. The intermediate frame 20 includes a base portion 21 disposed on the sound emitting surface side F in the axis O direction, and an extension portion 22 extending from the base portion 21 to the rear side B. The base portion 21 and the extension portion 22 are integrally molded. The intermediate frame 20 may be composed of a plurality of parts.

[0025] The base portion 21 is fixed to the flange 15. The base portion 21 is connected to the rear surface of the flange 15. The outer diameter of the base portion 21 may be the same as the outer diameter of the flange 15. The outer diameter of the base portion 21 may be smaller than the outer diameter of the flange 15 or may be larger than the outer diameter of the flange 15.

[0026] FIG. 3 is a cross-sectional view showing the intermediate frame 20. FIG. 3 shows a cross section along the axis O of the intermediate frame 20. The extension portion 22 is inclined with respect to the axis O in the cross section along the axis O. An inner diameter D1 of the sound emitting surface side F of the extension portion 22 is larger than an inner diameter D2 of the back side B of the extension portion 22. A connection surface 20a is formed at an end of the back side B of the intermediate frame 20. The connection surface 20a has an annular shape when viewed from the direction of the axis O. The connection surface 20a includes a surface perpendicular to the axis O.

[0027] As shown in Figs. 2 to 4, the speaker device 1 includes a spring member 30 that supports the speaker unit 2. Fig. 4 is a perspective view showing the spring member 30. The spring member 30 is located between the speaker unit 2 and the attachment target member 50 in a force transmission path between the speaker unit 2 and the attachment target member 50. The force transmission path between the speaker unit 2 and the attachment target member 50 includes parts to which a force for supporting the speaker unit 2 is transmitted. The speaker device 1 includes the spring member 30 and an attachment member 40 described later.

[0028] As shown in FIG. 4, the spring member 30 is a ring-shaped leaf spring. The plate thickness direction of the leaf spring is along the axis O direction. The spring member 30 may be made of metal or resin. The spring member 30 may be made of rubber. The spring member 30 may be made of other materials. The spring member 30 has a first ring (inner peripheral portion) 31, a second ring (outer peripheral portion) 32, and a connecting portion 33. The first ring 31 is disposed on the inner peripheral side, and the second ring 32 is disposed on the outer peripheral side. The connecting portion 33 is disposed between the first ring 31 and the second ring 32 in the radial direction Y, and connects the first ring 31 and the second ring 32. The spring member 30 has a plurality of connecting portions 33. The spring member 30 has, for example, four connecting portions 33.

[0029] The connecting portion 33 includes a first portion 33a having an arc shape, a second portion 33b connecting the first portion 33a and the first ring 31, and a third portion 33c connecting the first portion 33a and the second ring 32. The first portion 33a has a predetermined length in the circumferential direction of the spring member 30. A gap is formed between the connecting portions 33 adjacent to each other in the circumferential direction. In the radial direction Y, a gap is formed between the first ring 31 and the first portion 33a. A gap is formed between the second ring 32 and the first portion 33a. In the longitudinal direction of the first portion 33a, the second portion 33b is connected to one end, and the third portion 33c is connected to the other end.

[0030] As shown in Fig. 2 and Fig. 3, the first ring 31 is joined to the intermediate frame 20, and the second ring 32 is joined to the mounting member 40. The first ring 31 is joined to the connection surface 20a of the intermediate frame 20. The second ring 32 is joined to the end surface 40a of the back side B of the mounting member 40. The spring member 30 may be screwed or glued to the connection surface 20a. Similarly, the spring member 30 may be screwed or glued to the end surface 40a. The spring member 30 may be joined to the connection surface 20a and the end surface 40a by other methods.

[0031] The mounting member 40 includes a cylindrical body 41, a first flange 42, and a second flange 43. The cylindrical body 41 is arranged coaxially with the axis O. The cylindrical body 41 is arranged outside the intermediate frame 20 in the radial direction Y. The first flange 42 is arranged on the sound emitting surface side F of the cylindrical body 41. The first flange 42 protrudes outward in the radial direction Y from the cylindrical body 41. The second flange 43 is arranged on the back side B of the cylindrical body 41. The second flange 43 protrudes inward in the radial direction Y from the cylindrical body 41. The length of the mounting member 40 in the axial direction O is, for example, shorter than the length of the intermediate frame 20 in the axial direction O. In the axial direction O, the intermediate frame 20 protrudes toward the sound emitting surface side F more than the mounting member 40. The end surface 40a is the surface of the back side B of the second flange 43. As described above, the spring member 30 is joined to the end surface 40a.

[0032] The first flange 42 is fixed to the mounting target member 50. The first flange 42 is fixed to the mounting target member 50 with bolts. The first flange 42 may be joined to the mounting target member 50 by other methods.

[0033] The speaker device 1 includes a sealing member 16 that seals the gap between the mounting member 40 and the speaker unit 2. An inner circumferential side of the sealing member 16 is joined to the flange 15. An outer circumferential side of the sealing member 16 is joined to the first flange 42. The sealing member 16 is an elastic member, for example, a rubber film. The material of the sealing member 16 is not limited to rubber, and may be resin or the like. Moreover, the sealing member 16 is not limited to a film shape, and may be, for example, a block shape.

[0034] Next, a description will be given of the characteristics of the spring member 30. A spring constant k1 in the axial direction O of the spring member 30 is smaller than a spring constant k2 in the radial direction Y of the spring member 30. The spring member 30 is more easily deformed in the axial direction O than in the radial direction Y.

[0035] The resonance frequency fc based on the spring constant k1 of the spring member 30 and the mass m of the speaker unit 2 is lower than the output audio band of the speaker unit 2. When the mass of the spring member 30 is a value that cannot be ignored, the "mass m" may be replaced with the combined "mass m1" of the speaker unit 2 and the spring member 30.

[0036] The resonance frequency fc satisfies the following formula (1).

number

[0037] The resonant frequency fc is less than the lowest resonant frequency f0 of the speaker unit 2. The lowest resonant frequency f0 corresponds to the lower limit of the frequency range of the sound output from the speaker unit 2. The lowest resonant frequency f0 of the speaker unit 2 is, for example, not less than 30 Hz and not more than 60 Hz.

[0038] The lowest resonance frequency f0 of the speaker unit 2 is the lowest frequency among the frequencies at which the absolute value of the electrical impedance in the speaker unit 2 becomes maximum.

[0039] According to such a speaker device 1, since the spring member 30 is provided, the vibration caused by the speaker unit 2 is damped by the spring member 30. As a result, the vibration of the speaker unit 2 is less likely to be transmitted to the mounting member 40 and the mounting target member 50.

[0040] In the speaker device 1, a resonance frequency fc based on the spring constant k1 of the spring member 30 and the mass m of the speaker unit 2 is lower than the output sound band of the speaker unit 2. This suppresses the transmission of vibration of the speaker unit 2 to the mounting member 40 and the mounting target member 50 via the spring member 30.

[0041] In the speaker device 1, the spring member 30 is a leaf spring, and the thickness direction of the leaf spring is aligned with the axis O direction of the speaker unit 2. Since the thickness direction of the leaf spring is aligned with the vibration direction of the diaphragm 3, the vibration of the speaker unit 2 is not easily transmitted in the radial direction Y. Therefore, the vibration of the speaker unit 2 is not easily transmitted to the mounting member 40 and the mounting target member 50.

[0042] In the speaker device 1, the axis O direction extends along the horizontal direction, and the spring constant k1 of the spring member 30 in the axis O direction is lower than the spring constant k2 in the radial direction Y of the spring member 30. Therefore, the speaker device 1 is soft in the horizontal direction and hard in the vertical direction. The speaker device 1 has a structure suitable for vertical placement in which the axis O direction is arranged along the horizontal direction. Note that "soft in the horizontal direction" means that the speaker unit 2 is easily displaced in the horizontal direction. "Stiff in the vertical direction" means that the speaker unit 2 is less likely to be displaced in the vertical direction. The speaker unit 2 is more likely to be displaced in the horizontal direction than in the vertical direction.

[0043] In the speaker device 1, the spring member 30 is connected to the intermediate frame 20 and is disposed on the rear side B in the direction of the axis O relative to the flange 15 which is the end of the sound emitting surface side F of the speaker unit 2. In other words, the spring member 30 is disposed at a position closer to the magnetic circuit 6 in the direction of the axis O.

[0044] According to such a speaker device 1, since the spring member 30 can be disposed at a position close to the center of gravity of the speaker unit 2 in the direction of the axis O, it is possible to stably support the speaker unit 2. In the speaker device 1, it is possible to prevent the spring member 30 from being distorted and to suppress the inclination of the speaker unit 2.

[0045] In the speaker device 1, in the radial direction Y of the speaker unit 2, the connection surface 20a, which is the connection position between the spring member 30 and the speaker unit 2, is disposed at a position closer to the axis O than the outer circumferential portion 15a of the flange 15, which is the position of the maximum outer shape of the speaker unit 2. This makes it possible to reduce the size of the speaker device 1 in the radial direction Y. The installation space of the speaker device 1 can be reduced.

[0046] Next, a vehicle door (vehicle door) 100 including the speaker device 1 will be described. FIG. 5 is an exploded perspective view showing a vehicle door 100 including a speaker system according to an embodiment. As shown in FIG. 5, the vehicle door 100 includes a first panel 102 that is called an outer panel in contact with the outside, a second panel 103 that is called a door trim and is provided on the vehicle compartment side of the vehicle door 100 as an interior material, a third panel 104 that is called an inner panel and is provided between the first panel 102 and the second panel 103, and a speaker device 1 that is attached to the third panel 104. The first panel 102 and the third panel 104 are generally made of steel plates, and the front, rear and lower outer edge portions of the panels are joined to each other. The first panel 102 and the third panel 104 may also be made of an aluminum alloy or a carbon material. The second panel 103 is generally made of a synthetic resin molded plate. However, in the present disclosure, the constituent materials of these panels 102, 103, and 104 are not limited to those mentioned above. A frame 107 is provided above the first panel 102 and the third panel 104, and houses a window glass 106 so that the window glass 106 can move up and down.

[0047] The third panel 104 is provided with an opening 104a for accommodating the speaker device 1 and a plurality of openings 104b for accommodating a motor, a door lock actuator, etc. (not shown) for vertically moving the window glass 106. In this embodiment, at least a part of these openings 104b is not blocked by a motor, a door lock actuator, etc. (not shown), and no dedicated member for blocking the openings 104b is provided.

[0048] The second panel 103 is attached to the third panel 104 by removably fixing an outer edge portion of the second panel 103 to the third panel 104 with connecting members 109X, 109Y. A groove-shaped packing attachment portion is provided along the outer edge portion of the second panel 103, and packing 110 is fitted into the packing attachment portion, and this packing 110 maintains the airtightness of the space between the second panel 103 and the third panel 104. This space communicates with the space formed between the first panel 102 and the third panel 104 through at least a portion of an opening provided in the third panel 104.

[0049] The speaker unit 2 is attached to the third panel 104 via an attachment member 40. The attachment member 40 is fixed using screws. The third panel 104 is an example of a panel member, and corresponds to the attachment target member 50 described above.

[0050] It should be noted that the above-described embodiments merely illustrate typical forms of the present disclosure, and the present disclosure is not limited to the above-described embodiments, and various modifications and additions are possible without departing from the gist of the present disclosure.

[0051] In the above-described embodiment, the speaker device 1 is arranged so that the axis O is horizontal, but the speaker device 1 may be arranged so that the axis O is vertical, or the speaker device 1 may be arranged so that the axis O is inclined with respect to the horizontal.

[0052] In the above embodiment, the speaker device 1 is disposed in a vehicle door, but the speaker device 1 may be disposed in other parts of the vehicle. Also, the speaker device 1 may be applied to objects other than a vehicle.

[0053] The speaker device 1 may not include the intermediate frame 20 and the mounting member 40. The spring member 30 may be directly connected to the flange 15. The spring member 30 may be directly connected to the mounting target member 50. Similarly, the sealing member 16 may be directly connected to the mounting target member 50.

[0054] In the above embodiment, the sealing member 16 that seals the gap between the mounting member 40 and the flange 15 has been described, but the sealing member 16 may have other configurations. The speaker device 1 may be configured without the sealing member 16. The speaker device 1 may be configured with a sealing member that seals the gaps of other components. The speaker device 1 may be configured with a sealing member that seals the gaps of the spring member 30. The sealing member may be formed of a rubber film having elasticity and may seal the gaps of the spring member 30. The sealing member may be disposed in the gaps of the spring member 30, or may be disposed so as to cover the gaps. The speaker device 1 may also be configured with a spring member that functions as a sealing member. The speaker device 1 may be configured with a rubber spring member that does not have a gap formed therein. The sealing member may seal the gaps between a plurality of other components. The sealing member may be configured to seal the gaps between the mounting member 40 and the intermediate frame 20. [Explanation of symbols]

[0055] 1...speaker device, 2...speaker unit, 3...diaphragm, 3b...outer circumference of diaphragm, 4...speaker frame, 6...magnetic circuit, 15...flange (end of speaker unit on the sound emitting side), 15a...outer circumference portion (position of maximum outer shape of speaker unit), 16...sealing member 16, 20...intermediate frame, 20a...connection surface (position of connection between leaf spring and speaker unit), 30...spring-shaped member (leaf spring), 31...first ring (inner circumference portion), 32...second ring (outer circumference portion), 40...mounting member, 50...target member, 100...vehicle door (vehicle door), 104...third panel (target member, panel member), 104a...opening, B...rear side, F...sound emitting side, O...central axis of speaker unit, Y...radial direction.

Claims

1. A speaker unit; A spring member that connects the speaker unit to either a mounting target member or a mounting member that is attached to the mounting target member; Equipped with A spring constant k1 of the spring member in a central axis direction of the speaker unit is lower than a spring constant k2 of the spring member in a direction perpendicular to the central axis direction. Speaker equipment.

2. The spring member has a plate shape whose thickness direction is along the central axis direction of the speaker unit. The speaker device according to claim 1 .

3. A resonance frequency fc based on a spring constant k1 of the spring member in the central axis direction of the speaker unit and a mass m of the speaker unit or a combined mass m1 of the speaker unit and the spring member is lower than an output sound band of the speaker unit.

3. The speaker device according to claim 1 or 2.

4. The resonance frequency fc is the lowest resonance frequency f ０ is less than The speaker device according to claim 3 .

5. The speaker device according to any one of claims 1 to 4, A panel member having an opening formed therein, The speaker device is held in the opening. vehicle.

Images