Speaker device and vehicle door

Abstract

The present invention provides a speaker device capable of suppressing the transmission of vibration from a speaker unit to an object to be installed. The speaker device (1) comprises a speaker unit (2) and a spring member (30), wherein the spring member (30) is located between the speaker unit (2) and the object to be installed (50) and supports the speaker unit (2). The resonant frequency (fc) based on the spring constant (k1) of the spring member (30) in the direction (O) of the central axis of the speaker unit (2) and the mass (m) of the speaker unit (2) or the combined mass (m1) of the speaker unit (2) and the spring member (30) is lower than the output sound band of the speaker unit (2).

Description

Technical Field

[0001] The present invention relates to a speaker device and a vehicle door. Background Art

[0002] Some speakers have inner and outer boxes, including those with a coiled spring member interposed between them (see, for example, Patent Document 1). Others have seals and packaging members arranged around the sound-emitting surface of the speaker unit. These speakers are mounted to a surface member provided on a vehicle door trim via the seals and packaging members (see, for example, Patent Document 2).

[0003] Patent Document 1: Japanese Patent No. 6424963

[0004] Patent Document 2: Japanese Patent Application Laid-Open No. 10-210582 Summary of the Invention

[0005] Sometimes, the vibration of a speaker is transmitted through the speaker frame to the mounting component to which the speaker frame is attached. This can cause the mounting component to resonate or generate abnormal noise caused by the vibration. The present invention suppresses the transmission of the vibration of the speaker unit from the speaker frame to the mounting component.

[0006] A speaker device according to the present invention includes a speaker unit and a spring member positioned between the speaker unit and a mounting member to support the speaker unit. A resonant frequency fc, based on a spring constant k1 of the spring member in the direction of the speaker unit's central axis 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.

[0007] The vehicle door of the present invention includes the above-mentioned speaker device and a panel member having an opening formed therein. The speaker device is held in the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a front view of the speaker device according to the embodiment.

[0009] Figure 2 is a cross-sectional view of the speaker device.

[0010] Figure 3 It is a cross-sectional view showing the intermediate frame.

[0011] Figure 4 It is a perspective view showing the spring component.

[0012] Figure 5 It is an exploded perspective view showing a vehicle door equipped with a speaker device. DETAILED DESCRIPTION

[0013] Below, embodiments of the present invention are described with reference to the accompanying drawings. The dimensions and scales of the various components in the accompanying drawings may differ from the actual dimensions and scales as appropriate. The embodiments described below are preferred examples of the present invention. Therefore, various technically preferred limitations are included in these embodiments. However, the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

[0014] Figure 1 It is a front view of the speaker device 1 according to the embodiment. Figure 2 2 is a cross-sectional view of the speaker device 1 . Figure 1 and Figure 2 The speaker device 1 shown is, for example, Figure 5 As shown, it is used as a vehicle-mounted speaker device installed in a vehicle such as an automobile.

[0015] For example, the speaker device 1 can be mounted on a vehicle door via an inner panel, i.e., an attachment component 50. Furthermore, the use of the speaker device 1 is not limited to vehicle installation and may be used for other purposes. The attachment component 50 to which the speaker device 1 is attached is not limited to an inner panel. The attachment component 50 may also be another component such as a door trim. An opening is formed in the attachment component 50 to hold the speaker device 1. For example, the speaker device 1 is secured to the peripheral edge surrounding the opening via the attachment component 40, described below.

[0016] exist Figure 2 , a portion of the speaker device 1 is shown in cross section. This cross section is a cross section taken along the axis O of the speaker unit 2. In addition, the axis O is a line segment parallel to the vibration direction of the vibration plate 3 described later and passing through the center of the vibration plate 3. The direction intersecting the axis O is the radial direction Y of the speaker unit 2. In the direction of the axis O, the side where the vibration plate 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 described later.

[0017] The speaker device 1 includes a speaker unit 2. The speaker unit 2 includes a diaphragm 3, a driving unit 4, and a speaker frame 5, and is a structure in which these components are unitized.

[0018] The diaphragm 3 is a vibrating body composed of a sheet material that produces sound through vibration. The sheet material is obtained, for example, by impregnating a fiber base material with a resin material and then hardening or solidifying it. 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, zirconium oxide 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.

[0019] The vibration plate 3 vibrates in a direction along the axis O. The vibration plate 3 is cone-shaped. The shape of the vibration plate 3 is not limited to a cone, and may be, for example, a dome-shaped.

[0020] The driving unit 4 is a mechanism for driving the diaphragm 3 based on an input electrical signal. The driving unit 4 includes a magnetic circuit 6 for generating a magnetic field and a voice coil 7 connected to the diaphragm 3 .

[0021] Magnetic circuit 6 includes magnet 8, yoke 9, and center rod 10. Magnet 8, yoke 9, and center rod 10 are arranged on back side B of diaphragm 3 in the direction of axis O. Magnet 8, yoke 9, and center rod 10 are arranged coaxially with axis O. Magnet 8 is annular, yoke 9 is disc-shaped, and center rod 10 is cylindrical. Yoke 9 and center rod 10 are made of magnetic material.

[0022] The magnetic flux generated by magnet 8 passes through yoke 9 and center rod 10. The magnetic flux passing through magnetic circuit 6 forms a magnetic field around magnetic circuit 6. Voice coil 7 is arranged in the magnetic field formed by magnetic circuit 6.

[0023] Speaker unit 2 includes bobbin 11 around which voice coil 7 is wound. Bobbin 11 includes cylindrical portion 11a and center cover 11b. Center cover 11b closes the front opening of cylindrical portion 11a. Voice coil 7 is wound around the outer circumference of cylindrical portion 11a of bobbin 11.

[0024] The vibration plate 3 is formed around the center cover 11 b when viewed from the axis O. The inner periphery 3 a of the vibration plate 3 is connected to the outer periphery of the center cover 11 b.

[0025] Speaker unit 2 has an elastic edge portion 12. When viewed from axis O, edge portion 12 is annular and extends along outer periphery 3b of diaphragm 3. Outer periphery 3b of diaphragm 3 is connected to edge portion 12. Diaphragm 3 is connected to speaker frame 5 via edge portion 12.

[0026] The speaker frame 5 holds the vibration plate 3 and the magnetic circuit 6. The speaker frame 5 is made of iron, metal, or resin. The shape of the speaker frame 5 is not limited to any shape as long as it can hold the vibration plate 3 and the magnetic circuit 6. Figure 2 The shapes shown are arbitrary

[0027] The speaker frame 5 includes a conical portion 13, a magnetic circuit accommodating portion 14, and a flange 15. The conical portion 13 is formed to cover the diaphragm 3 from the outside in the radial direction Y. The magnetic circuit accommodating portion 14 is arranged on the back side B of the conical portion 13 in the direction of the axis O. The magnetic circuit accommodating portion 14 accommodates the magnet 8 and yoke 9 in the magnetic circuit 6. The back side B of the center rod 10 is partially accommodated in the magnetic circuit accommodating portion 14. The sound emitting surface side F of the center rod 10 extends into the conical portion 13. The magnetic circuit accommodating portion 14 accommodates a portion of the magnetic circuit 6.

[0028] The flange 15 extends outward in the radial direction Y from the end portion of the conical portion 13 on the sound emitting surface side F. The flange 15 has an annular shape when viewed from the axis O direction.

[0029] The speaker unit 2 includes an intermediate frame 20 connected to the speaker frame 5. The intermediate frame 20 is positioned outside the conical portion 13 in the radial direction Y. When viewed from the axis O, the intermediate frame 20 has, for example, a circular ring shape. The intermediate frame 20 may also include, for example, a cylindrical body. The intermediate frame 20 includes a base portion 21 positioned on the sound emitting surface F in the axis O direction, and an extension portion 22 extending from the base portion 21 toward the back surface B. The base portion 21 and the extension portion 22 are integrally formed. The intermediate frame 20 may also be constructed from multiple components.

[0030] The base portion 21 is fixed to the flange 15. The base portion 21 is connected to the back 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 larger than the outer diameter of the flange 15.

[0031] Figure 3 2 is a cross-sectional view showing the intermediate frame 20. Figure 3 , shows a cross section of the intermediate frame 20 along the axis O. The extension 22 is inclined relative to the axis O in the cross section along the axis O. The inner diameter D1 of the extension 22 on the sound-emitting surface side F is larger than the inner diameter D2 of the extension 22 on the back side B. A connecting surface 20a is formed at the end of the back side B of the intermediate frame 20. The connecting surface 20a is annular when viewed from the axis O. The connecting surface 20a includes a surface perpendicular to the axis O.

[0032] like Figures 2 to 4 As shown, the speaker device 1 includes a spring member 30 that supports the speaker unit 2 . Figure 4This is a perspective view showing spring member 30. Spring member 30 is located between speaker unit 2 and mounting component 50 in the force transmission path between the speaker unit 2 and the mounting component 50. The force transmission path between the speaker unit 2 and the mounting component 50 includes a member to which force for supporting the speaker unit 2 is transmitted. Speaker device 1 includes spring member 30 and mounting component 40, which will be described later.

[0033] like Figure 4 As shown, the spring component 30 is an annular leaf spring. The thickness direction of the leaf spring is along the axis O. The spring component 30 can be formed of metal or resin. The spring component 30 can be formed of rubber. The spring component 30 can also be formed of other materials. In addition, the spring component 30 can also be an elastic component other than a spring and is not limited to Figure 4 The shape shown. For example, it can be an O-ring or an annular viscoelastic body. The spring component 30 has a first ring portion (inner peripheral portion) 31, a second ring portion (outer peripheral portion) 32 and a connecting portion 33. The first ring portion 31 is arranged on the inner peripheral side, and the second ring portion 32 is arranged on the outer peripheral side. The connecting portion 33 is arranged between the first ring portion 31 and the second ring portion 32 in the radial direction Y, and connects the first ring portion 31 and the second ring portion 32. The spring component 30 has a plurality of connecting portions 33. The spring component 30 has, for example, four connecting portions 33.

[0034] The connecting portion 33 includes an arcuate first portion 33a; a second portion 33b connecting the first portion 33a to the first ring portion 31; and a third portion 33c connecting the first portion 33a to the second ring portion 32. The first portion 33a has a predetermined length in the circumferential direction of the spring member 30. A gap is formed between circumferentially adjacent connecting portions 33. In the radial direction Y, a gap is formed between the first ring portion 31 and the first portion 33a. A gap is formed between the second ring portion 32 and the first portion 33a. Along the longitudinal direction of the first portion 33a, one end is connected to the second portion 33b, and the other end is connected to the third portion 33c.

[0035] like Figure 2 and Figure 3 As shown, the first ring portion 31 is joined to the intermediate frame 20, and the second ring portion 32 is joined to the mounting member 40. The first ring portion 31 is joined to the connecting surface 20a of the intermediate frame 20. The second ring portion 32 is joined to the end surface 40a on the back side B of the mounting member 40. The spring member 30 can be screwed or bonded to the connecting surface 20a. Similarly, the spring member 30 can be screwed or bonded to the end surface 40a. The spring member 30 can also be joined to the connecting surface 20a and the end surface 40a using other methods.

[0036] 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 extends outward from the cylindrical body 41 in the radial direction Y. The second flange 43 is arranged on the back side B of the cylindrical body 41. The second flange 43 extends inward from the cylindrical body 41 in the radial direction Y. The length of the mounting member 40 in the direction of the axis O is, for example, shorter than the length of the intermediate frame 20 in the direction of the axis O. In the direction of the axis O, the intermediate frame 20 extends further toward the sound emitting surface side F than the mounting member 40. The end surface 40a is the surface on the back side B of the second flange 43. As described above, the spring member 30 is joined to the end surface 40a.

[0037] The first flange 42 is fixed to the mounting member 50. The first flange 42 is fixed to the mounting member 50 by bolts. The first flange 42 may be joined to the mounting member 50 by other methods.

[0038] Speaker device 1 includes a sealing member 16 that seals the gap between mounting member 40 and speaker unit 2. The inner circumference of sealing member 16 is bonded to flange 15. The outer circumference of sealing member 16 is bonded to first flange 42. Sealing member 16 is an elastic member, such as a rubber membrane. The material of sealing member 16 is not limited to rubber and may also be resin or the like. Furthermore, sealing member 16 is not limited to a membrane shape and may also be a block shape, for example.

[0039] Next, the characteristics of the spring member 30 are described. The spring constant (elastic characteristic) k1 of the spring member 30 in the axis O direction is smaller than the spring constant k2 in the radial direction Y of the spring member 30. The spring member 30 is more easily deformed in the axis O direction than in the radial direction Y.

[0040] The resonant frequency fc resulting from 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. Furthermore, if the mass of the spring member 30 is sufficiently large that it cannot be ignored, "mass m" may be replaced with "mass m1" which is the total mass of the speaker unit 2 and the spring member 30.

[0041] The resonance frequency fc satisfies the following formula (1).

[0042] [Formula 1]

[0043]

[0044] The resonance frequency fc is lower than the lowest resonance frequency f0 of the speaker unit 2. The lowest resonance frequency f0 corresponds to the lower limit of the frequency range of the sound output from the speaker unit 2. The lowest resonance frequency f0 of the speaker unit 2 is, for example, 30 Hz or more and 60 Hz or less.

[0045] The lowest resonance frequency f0 of the speaker unit 2 is the lowest frequency among frequencies at which the absolute value of the electrical impedance in the speaker unit 2 becomes maximum.

[0046] According to the speaker device 1 as described above, since the spring member 30 is provided, the vibration caused by the speaker unit 2 is attenuated by the spring member 30. Therefore, the vibration of the speaker unit 2 is less likely to be transmitted to the mounting member 40 and the mounting target member 50.

[0047] In speaker device 1, the resonance frequency fc due to the spring constant k1 of spring member 30 and the mass m of speaker unit 2 is lower than the output sound band of speaker unit 2. This prevents the vibration of speaker unit 2 from being transmitted to mounting member 40 and mounting target member 50 via spring member 30.

[0048] In speaker device 1, spring member 30 is a leaf spring whose thickness is aligned with axis O of speaker unit 2. Since the leaf spring's thickness is aligned with the vibration direction of diaphragm 3, vibrations generated by speaker unit 2 are less likely to be transmitted in radial direction Y. Consequently, vibrations of speaker unit 2 are less likely to be transmitted to mounting member 40 and mounting target member 50.

[0049] In speaker device 1, axis O extends horizontally, and the spring constant k1 of spring member 30 in the axis O direction is lower than the spring constant k2 in the radial direction Y of spring member 30. Therefore, speaker device 1 is flexible in the horizontal direction and rigid in the vertical direction. Speaker device 1 has a longitudinal structure suitable for horizontally oriented configuration with axis O extending horizontally. Furthermore, being flexible in the horizontal direction means that speaker unit 2 is easily displaced in the horizontal direction. Being rigid in the vertical direction means that speaker unit 2 is not easily displaced in the vertical direction. Speaker unit 2 is more easily displaced in the horizontal direction than in the vertical direction.

[0050] In speaker device 1, spring member 30 is connected to intermediate frame 20 and is positioned closer to rear surface side B than flange 15, which is the end portion on sound emitting surface side F of speaker unit 2, in the direction of axis O. In other words, spring member 30 is positioned closer to magnetic circuit 6 in the direction of axis O.

[0051] According to the speaker device 1 described above, the spring member 30 can be arranged near the center of gravity of the speaker unit 2 in the direction of the axis O, thereby stably supporting the speaker unit 2. In the speaker device 1, the spring member 30 can be prevented from tilting, thereby suppressing the inclination of the speaker unit 2.

[0052] In speaker device 1, in radial direction Y of speaker unit 2, connection surface 20a, which is the connection point between spring member 30 and speaker unit 2, is located closer to axis O than outer peripheral portion 15a of flange 15, which is the position of the maximum outer shape of speaker unit 2. This allows speaker device 1 to be miniaturized in radial direction Y. The installation space of speaker device 1 can be reduced.

[0053] Next, a vehicle door (vehicle door) 100 including the speaker device 1 will be described. Figure 5 FIG. 1 is an exploded perspective view showing a vehicle door 100 having a speaker system according to an embodiment. Figure 5 As shown, a vehicle door 100 includes a first panel 102, referred to as an outer panel, which contacts the exterior; a second panel 103, referred to as a door trim, which serves as an interior trim component on the interior side of vehicle door 100; a third panel 104, referred to as an inner panel, which is disposed between first and second panels 102, 103; and a speaker device 1 mounted on third panel 104. First and third panels 102, 104 are typically constructed of steel plates, with their front, rear, and lower outer edges joined together. Aluminum alloys or carbon materials can also be used for these panels. Second panel 103 is typically constructed of a synthetic resin molded plate. However, in the present invention, the materials constituting these panels 102, 103, and 104 are not limited to the materials listed above. A frame 107 is disposed above first and third panels 102, 104, accommodating window glass 106 in a manner that allows it to move vertically.

[0054] 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 or door lock actuator (not shown) for vertically moving the window glass 106. In this embodiment, at least a portion of these openings 104b is not blocked by the motor or door lock actuator (not shown), and no dedicated component is provided to block the openings 104b.

[0055] The outer edge of the second panel 103 is detachably fixed to the third panel 104 by connecting members 109X and 109Y, thereby mounting the second panel 103 relative to the third panel 104. A groove-shaped gasket mounting portion is provided along the outer edge of the second panel 103, and a gasket 110 is embedded in the gasket mounting portion. The gasket 110 maintains the airtightness of the space between the second panel 103 and the third panel 104. This space is connected to 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.

[0056] The speaker unit 2 is mounted on the third panel 104 via the mounting member 40. The mounting member 40 is fixed using screws. The third panel 104 is an example of a panel member and corresponds to the aforementioned mounting target member 50.

[0057] The above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the above-described embodiments, but various changes and additions can be made without departing from the spirit of the present invention.

[0058] In the above embodiment, the speaker device 1 is described as being arranged with the axis O in the horizontal direction. However, the speaker device 1 may be arranged with the axis O in the vertical direction or with the axis O tilted relative to the horizontal direction.

[0059] In the above embodiment, the speaker device 1 is shown as an example of being arranged in a vehicle door, but the speaker device 1 may be arranged in other parts of the vehicle. In addition, the speaker device 1 may be applied to objects other than vehicles.

[0060] The speaker device 1 may be configured without 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 member 50. Similarly, the sealing member 16 may be directly connected to the mounting member 50.

[0061] In the above embodiment, the sealing member 16 that seals the gap between the mounting member 40 and the flange 15 is described, but the sealing member 16 may have another structure. The speaker device 1 may also have a structure without the sealing member 16. The speaker device 1 may also have a sealing member that seals the gap between other components. The speaker device 1 may also have a sealing member that seals the gap of the spring member 30. The sealing member may also be formed of a rubber film having elasticity to seal the gap of the spring member 30. The sealing member may be arranged in the gap of the spring member 30, or may be arranged to cover the gap. In addition, the speaker device 1 may have a spring member that functions as a sealing member. The speaker device 1 may also have a structure having a rubber spring member that does not form a gap. The sealing member may also seal the gap between multiple other components. The sealing member may also seal the gap between the mounting member 40 and the intermediate frame 20.

[0062] Description of the label

[0063] 1…speaker device, 2…speaker unit, 3…diaphragm, 3b…outer periphery of the diaphragm, 4…driving unit, 5…speaker frame, 6…magnetic circuit, 15…flange (end of the speaker unit on the sound-emitting surface side), 15a…outer periphery (position of the speaker unit's largest outer shape), 16…sealing member, 20…intermediate frame, 20a…connecting surface (connection position between the leaf spring and the speaker unit), 30…spring-shaped member (leaf spring), 31…first ring portion (inner periphery), 32…second ring portion (outer periphery), 40…mounting member, 50…mounting target member, 100…vehicle door (vehicle door), 104…third panel (mounting target member, panel member), 104a…opening, B…back side, F…sound-emitting surface side, O…center axis of the speaker unit, Y…radial direction.

Claims

1. A speaker device comprising: speaker unit; and an elastic member located between the speaker unit and the mounting target component and supporting the speaker unit; The resonant frequency (fc) based on the elastic characteristics (k1) of the elastic member in the central axis direction of the speaker unit and the mass (m) of the speaker unit or the combined mass (m1) of the speaker unit and the elastic member is lower than the output sound band of the speaker unit, The elastic characteristic (k1) of the elastic member in the direction of the central axis of the speaker unit is lower than the elastic characteristic (k2) of the elastic member in a direction perpendicular to the central axis.

2. The speaker device according to claim 1, wherein The elastic component is a spring component, and the elastic characteristic (k1) is a spring constant.

3. The speaker device according to claim 2, wherein The resonant frequency (fc) is lower than the lowest resonant frequency (f0) of the speaker unit.

4. The speaker device according to claim 2 or 3, wherein The spring member is a leaf spring, The thickness direction of the leaf spring is along the central axis direction of the speaker unit.

5. The speaker device according to claim 4, wherein The central axis of the speaker unit extends in a horizontal direction.

6. The speaker device according to claim 4, wherein The speaker unit comprises: Vibration plate; a speaker frame disposed on an outer peripheral side of the vibration plate; a magnetic circuit disposed on the rear side of the diaphragm in the direction of the central axis of the speaker unit; as well as The intermediate frame is connected to the speaker frame, extends from the sound emitting surface side to the back side of the speaker unit, and is connected to the leaf spring.

7. The speaker device according to claim 6, wherein The leaf spring is in a circular ring shape and comprises: an outer peripheral portion connected to the mounting member; and The inner peripheral portion is arranged on the inner peripheral side of the outer peripheral portion and is connected to the intermediate frame.

8. The speaker device according to claim 6, wherein The leaf spring is connected to the intermediate frame and is arranged on the rear side of an end portion on the sound emitting surface side of the speaker unit in the central axis direction of the speaker unit.

9. The speaker device according to claim 4, wherein In the radial direction of the speaker unit, a connection position between the leaf spring and the speaker unit is located closer to a central axis of the speaker unit than a position of a maximum outer shape of the speaker unit.

10. The speaker device according to claim 2 or 3, wherein Also features: An installation component that is installed on the installation target component; and a sealing member that seals a gap between the mounting member and the speaker unit, The spring member is connected to the mounting target member via the mounting member.

11. A vehicle door, comprising: The speaker device according to any one of claims 1 to 10; and a panel member having an opening formed therein, The speaker device is held in the opening.

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