Acoustic vibration exciter

Abstract

In an acoustic vibration device that vibrates panel material, a drip-proof structure is added while suppressing an increase in the height dimension. [Solution] The acoustic vibration device 1 comprises a frame 11 fixed to the ceiling interior material 501 side between the ceiling interior material 501 and the outer panel 502 of the vehicle, a vibration unit 12 including a cylindrical body 4 and a magnetic circuit unit 3, a voice coil 52 arranged in the magnetic gap of the magnetic circuit unit 3, a bobbin 51 around which the voice coil 52 is wound, a first damper 61 connecting the cylindrical body 4 and the bobbin 51, a second damper 62 connecting the cylindrical body 4 and the frame 11, and a drip-proof cover 2 to prevent water droplets falling from the outer panel 502 side from adhering to the second damper 62. The drip-proof cover 2 is formed in an annular shape with an open center, is attached to the vibration unit 12, and is positioned on the outer circumference side of the magnetic circuit unit 3 and above the second damper 62. The upper part of the magnetic circuit unit 3 is positioned above the drip-proof cover 2, passing through the opening 23 of the drip-proof cover 2.

Description

Technical Field

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[0001] The present invention relates to a vibration device for acoustics.

Background Art

[0002] A vibration device that vibrates a panel material to perform acoustic reproduction is known. As an example, Patent Document 1 discloses a vibration device that is disposed between the ceiling interior material and the outer plate of a vehicle and outputs sound into the vehicle interior by vibrating the ceiling interior material.

[0003] The vibration device (2) described in FIG. 5 of Patent Document 1 includes a magnetic circuit portion (4), a cylindrical body (5) that holds the magnetic circuit portion (4), a coil (32) disposed in the magnetic gap of the magnetic circuit portion (4), a bobbin portion (21m) around which the coil (32) is wound, a coil support member (21) including the bobbin portion (21m), a coupler (22) to which the coil support member (21) is assembled and fixed to the ceiling interior material (50), a first damper (33) that connects the bobbin portion (21m) and the cylindrical body (5), and a second damper (34) that connects the cylindrical body (5) and the coil support member (21).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the vibration device (2) of FIG. 5 of the above-described Patent Document 1, condensed water that has fallen from the outer plate of the vehicle may adhere to the second damper (34), and it has been desired to add a drip-proof structure. However, it has not been easy to add the drip-proof structure so as to fit in the narrow space between the ceiling interior material and the outer plate of the vehicle.

[0006] Therefore, one example of a problem that the present invention aims to solve is to add a drip-proof structure to an acoustic vibration device that vibrates a panel material while suppressing an increase in the height dimension. [Means for solving the problem]

[0007] The acoustic vibration device of the present invention comprises a frame fixed to a panel material, a vibration unit including a cylindrical body and a magnetic circuit attached to the inner circumference of the cylindrical body, and a drip-proof cover that prevents water droplets from falling from above the panel material, wherein the drip-proof cover is attached to the vibration unit. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of an acoustic vibration exciter according to one embodiment of the present invention. [Figure 2] This is a cross-sectional view along line AA in Figure 1. [Figure 3] This is an enlarged view of the main part of Figure 2. [Figure 4] Figure 1 is an exploded view of the acoustic vibration device. [Figure 5] This is a plan view showing the base and flange before assembly in Figure 4. [Figure 6] Figure 5 is a plan view showing the assembled state of the base and flange. [Figure 7] This diagram illustrates the assembly structure of the base and flange shown in Figure 5. [Modes for carrying out the invention]

[0009] One embodiment of the present invention is described below. The acoustic vibration device according to one embodiment of the present invention comprises a frame fixed to a panel material, a vibration unit including a cylindrical body and a magnetic circuit attached to the inner circumference of the cylindrical body, a voice coil disposed in the magnetic gap of the magnetic circuit, a bobbin around which the voice coil is wound, a first damper connecting the cylindrical body and the bobbin, a second damper connecting the cylindrical body and the frame, and a drip-proof cover that prevents water droplets falling from above the panel material from adhering to the second damper. The drip-proof cover is formed in an annular shape with an open center, attached to the vibration unit, and positioned on the outer circumference of the magnetic circuit and above the second damper, with the upper part of the magnetic circuit passing through the opening and positioned above the drip-proof cover. In this way, the drip-proof cover can prevent water droplets falling from above the panel material from adhering to the second damper. Furthermore, by forming the drip-proof cover in an annular shape with an open center and attaching it to the vibration unit, it is possible to suppress an increase in the height dimension.

[0010] Furthermore, it is preferable that the upper surface of the drip-proof cover is formed to have a downward slope from the inner circumference to the outer circumference. By forming it in this way, water droplets adhering to the drip-proof cover can be guided to the outer circumference and dropped onto the panel material.

[0011] Furthermore, it is preferable that the cylindrical body comprises a cylindrical portion and a flange portion extending outward from the lower end of the cylindrical portion, with the outer circumference of the first damper overlapping the lower surface of the flange portion, the inner circumference of the second damper overlapping the upper surface of the flange portion, and the magnetic circuit portion and the drip-proof cover being attached to the cylindrical portion. This configuration further suppresses the increase in the height dimension. [Examples]

[0012] Figures 1-4 show an acoustic vibration device 1 according to one embodiment of the present invention. The acoustic vibration device 1 is placed between the interior ceiling material (corresponding to a panel material) 501 and the exterior panel 502 of a vehicle, and outputs sound into the vehicle interior by vibrating the interior ceiling material 501.

[0013] In this specification, the descriptions of the "up" and "down" directions are based on the state in which the acoustic vibration exciter 1 is positioned between the interior ceiling material 501 and the outer panel 502 of the vehicle.

[0014] The acoustic vibration device 1 comprises a frame 11, a vibration unit 12, a voice coil assembly 5 in which a voice coil 52 is wound around a bobbin 51, a first damper 61, a second damper 62, a drip-proof cover 2, and a capacitor 93.

[0015] The frame 11 comprises a synthetic resin base 8 fixed to the ceiling interior material 501 via double-sided tape 91, and a synthetic resin flange 7 assembled to the base 8.

[0016] The base 8 comprises a plate portion 81 that is superimposed on the ceiling interior material 501 via double-sided tape 91, an annular rib 82 formed on the upper surface of the plate portion 81, three claws 83 provided in connection with the rib 82, a bolt fastening portion 84 connected to the outer circumference of the plate portion 81, and three protrusions 85 that project inward from the rib 82.

[0017] The flange 7 includes an annular base 71 that is inside the rib 82 and superimposed on the upper surface of the plate portion 81, a first damper mounting portion 74 that is connected to the base 71 and extends upward and inward, three protrusions 75 that project outward from the outer circumference of the base 71, an annular second damper mounting portion 72 that surrounds the base 71, a connecting portion 73 that connects the base 71 and the second damper mounting portion 72, and a connector portion 76, a capacitor mounting portion 77, a bolt fastening portion 78, etc., connected to the outer circumference of the second damper mounting portion 72.

[0018] The connector portion 76 connects the voice coil 52 and an external voice current supply source. The capacitor mounting portion 77 is a portion where the capacitor 93 is mounted. The capacitor 93 is interposed between the voice current supply source and the voice coil 52.

[0019] As shown in FIG. 5, the above-described base 8 and flange 7 are assembled by turning the flange 7 clockwise from the overlapped state, so that each convex portion 75 of the flange 7 enters the groove 83a of each claw 83 of the base 8 as shown in FIG. 6 and are assembled with each other. As shown in FIG. 7, the groove 83a of the claw 83 is formed so that the width gradually narrows along the insertion direction (arrow D) of the convex portion 75. Therefore, when the flange 7 is turned in, the fitting between the claw 83 and the convex portion 75 gradually becomes tight. When the flange 7 is further turned in, the convex portion 75 abuts against the convex portion 85. After assembling the base 8 and the flange 7 in this way, as an anti-loosening measure, a bolt 92 is fastened to the bolt fastening portions 84, 78 to fix the base 8 and the flange 7.

[0020] When repairing the vibration device 1 for acoustics, the bolt 92 can be removed and the flange 7 can be easily separated from the base 8 by turning the flange 7 counterclockwise.

[0021] The vibration portion 12 includes a cylindrical body 4 made of synthetic resin and a magnetic circuit portion 3 attached to the inner peripheral side of the cylindrical body 4.

[0022] The cylindrical body 4 includes a cylindrical portion 41, a flange portion 42 extending outward from the lower end of the cylindrical portion 41, and a protruding portion 43 protruding from the inner peripheral surface of the cylindrical body 4.

[0023] The magnetic circuit section 3 comprises a yoke 31 made of magnetic material, a disc-shaped magnet 32, and a disc-shaped plate 33 made of magnetic material. The yoke 31 comprises a disc-shaped overlapping portion 31a that is superimposed on the magnet 32, and a cylindrical side wall 31b that hangs down from the outer edge of the overlapping portion 31a. The magnet 32 ​​is superimposed on the inside of the side wall 31b and on the lower surface of the overlapping portion 31a, and the plate 33 is superimposed on the inside of the side wall 31b and on the lower surface of the magnet 32. A magnetic gap is formed between the inner circumferential surface of the side wall 31b and the outer circumferential surface of the plate 33.

[0024] The magnetic circuit section 3 is attached to the inner circumference of the cylindrical section 41 with the lower end of the side wall 31b of the yoke 31 in contact with the protruding section 43 of the cylindrical section 4.

[0025] The voice coil assembly 5 is supported by the first damper 61, which is attached to the outer surface of the bobbin 51. The upper part of the bobbin 51 and the voice coil 52 are positioned within the magnetic gap of the magnetic circuit section 3.

[0026] The first damper 61 is made of a material in which resin has been impregnated into a woven fabric and is formed in an annular shape. The first damper 61 comprises an inner circumferential portion 61a bonded to the bobbin 51, an outer circumferential portion 61b bonded to the lower surface of the flange portion 42 of the cylindrical body 4, and a wavy portion 61c provided between the inner circumferential portion 61a and the outer circumferential portion 61b. In this way, the first damper 61 connects the inner circumferential side of the cylindrical body 4 and the bobbin 51.

[0027] Furthermore, the first damper mounting portion 74 of the flange 7 is bonded to the inner circumference 61a of the first damper 61. In addition, the first damper mounting portion 74 of the flange 7 is bonded to the outer circumference of the bobbin 51.

[0028] The second damper 62 is made of a material in which resin has been impregnated into a woven fabric and is formed in an annular shape. The second damper 62 comprises an inner circumferential portion 62a that is superimposed on and bonded to the upper surface of the flange portion 42 of the cylindrical body 4, an outer circumferential portion 62b that is superimposed on and bonded to the second damper mounting portion 72 of the flange 7, and a curved portion 62c provided between the inner circumferential portion 62a and the outer circumferential portion 62b. The curved portion 62c is formed in a semicircular cross-section that bulges upward. In this way, the second damper 62 connects the outer circumferential side of the cylindrical body 4 to the flange 7. Furthermore, the second damper 62 is positioned outside the first damper 61.

[0029] As described above, the cylindrical body 4 is supported by both the first damper 61 located on its inner circumference and the second damper 62 located on its outer circumference. By adopting this configuration, rolling of the vibration section 12 can be suppressed, and the durability of the acoustic vibration device 1 can be increased.

[0030] The drip-proof cover 2 is intended to prevent water droplets (condensation) falling from the outer plate 502 side from adhering to the second damper 62, and in this example, it is attached to the cylindrical body 4. The drip-proof cover 2 is made of synthetic resin and comprises a cover body 21 and a mounting portion 22. The cover body 21 is formed in an annular shape with an opening in the center. Reference numeral 23 is denoted at the opening in the center of the cover body 21. The mounting portion 22 is formed in a cylindrical shape and hangs down from the lower surface of the cover body 21 and the outer circumference of the opening 23. The mounting portion 22 is attached to the upper end and outer surface of the cylindrical portion 41.

[0031] Such a drip-proof cover 2 is positioned on the outer periphery of the magnetic circuit section 3 and above the second damper 62. The upper part of the magnetic circuit section 3 is positioned above the drip-proof cover 2 through the opening 23. Furthermore, the upper surface of the cover body 21 is formed to have a downward slope from the inner periphery to the outer periphery. This allows water droplets adhering to the drip-proof cover 2 to be guided to the outer periphery and fall towards the ceiling interior material 501.

[0032] The acoustic vibration exciter 1 is located in a narrow space between the interior ceiling material 501 and the outer panel 502 of the vehicle, and there were constraints on the height dimension when installing the drip-proof cover 2. In order to suppress the increase in height dimension, the drip-proof cover 2 is not a cover that covers the entire vibration section 12, but rather has a minimal and simple configuration that covers the second damper 62. Specifically, as described above, the cover body 21 is formed in an annular shape with an opening in the center, and the drip-proof cover 2 is made in a height that does not exceed the upper part of the magnetic circuit section 3 (the overlapping part 31a of the yoke 31), and this drip-proof cover 2 is attached to the cylindrical body 4.

[0033] Furthermore, in order to suppress an increase in the height dimension of the cylindrical body 4, the cylindrical body 4 is composed of a cylindrical portion 41, a flange portion 42, and a protruding portion 43. The first damper 61 is attached to the lower surface of the flange portion 42, the second damper 62 is attached to the upper surface of the flange portion 42, the magnetic circuit portion 3 is attached to the inner circumference of the cylindrical portion 41, and the mounting portion 22 of the drip-proof cover 2 is attached to the outer circumference of the cylindrical portion 41. With these configurations, it is possible to suppress an increase in the height dimension of the entire acoustic vibration exciter 1.

[0034] Furthermore, by forming the cover body 21 in an annular shape with an opening in the center, the splash-proof cover 2 can be made lighter. In addition, since the upper part of the magnetic circuit section 3 is exposed through the opening 23 of the cover body 21, heat dissipation can be improved.

[0035] In the above configuration, the acoustic vibration device 1 uses the electromagnetic force generated by the supply of sound current to the voice coil 52 as the driving force, and the vibration unit 12 mainly vibrates, causing the ceiling interior material 501 to vibrate via the frame 11, thereby outputting sound into the vehicle interior.

[0036] In the above-described embodiment, the excitation unit 12 comprised a cylindrical body 4 and a magnetic circuit unit 3. However, the excitation unit of the present invention may comprise a cylindrical body, a magnetic circuit unit, and other components. Furthermore, in the above-described embodiment, the drip-proof cover 2 was attached to the cylindrical body 4. However, in the present invention, the drip-proof cover may be attached to the magnetic circuit unit, or to components other than the cylindrical body and magnetic circuit unit.

[0037] Furthermore, in the above-described embodiment, the acoustic vibration device 1 was attached to the interior ceiling material 501 of the vehicle. However, the acoustic vibration device of the present invention is not limited to the interior ceiling material of a vehicle, but can be attached to various panel materials that can produce sound by vibrating.

[0038] Although embodiments of the present invention have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and any design changes, etc., that do not depart from the gist of the present invention are also included. The embodiments shown in each of the above figures can be combined as long as there are no particular contradictions or problems in their purpose and configuration. Furthermore, each figure can be an independent embodiment, and the embodiments of the present invention are not limited to a single embodiment that combines each figure. [Explanation of symbols]

[0039] 1. Acoustic vibration exciter 2. Splash-proof cover 3. Magnetic circuit section 4. Cylindrical body 7 Flange 8 Base 11 frames 12 Vibration section 51 bobbins 52 Voice Coil 61 First Dump 62. Second Damper 501 Ceiling interior materials (panel materials) 502 Exterior

Claims

[Claim 1] A frame that is fixed to the panel material, An excitation unit including a cylindrical body and a magnetic circuit attached to the inner circumference of the cylindrical body, The panel material is equipped with a drip-proof cover to prevent water droplets from falling from above, The drip-proof cover is attached to the vibration section. A vibration exciter for acoustics characterized by the following features.

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