Acoustic vibration device

Abstract

An acoustic excitation device (1) comprises: a frame (11) fixed to a ceiling interior material (501) side between the ceiling interior material (501) and an outer plate (502) of a vehicle; an excitation unit (12) that includes a cylindrical body (4) and a magnetic circuit unit (3); a voice coil (52) disposed in a magnetic gap of the magnetic circuit unit (3); a bobbin (51) on which the voice coil (52) is wound; a first damper (61) that connects the cylindrical body (4) and the bobbin (51); a second damper (62) that connects the cylindrical body (4) and the frame (11); and a drip-proof cover (2) that prevents drops which have dropped from the outer plate (502) side from adhering to the second damper (62). The drip-proof cover (2) is formed into an annular shape opened at the center, is fitted to the excitation unit (12), and is disposed on the outer peripheral side of the magnetic circuit unit (3) and above the second damper (62). In addition, an upper part of the magnetic circuit unit (3) is passed through an opening (23) of the drip-proof cover (2), and is disposed above the drip-proof cover (2).

Description

[Technical Field]

[0001] The present invention relates to an acoustic vibration device. [Background technology]

[0002] Vibration devices that vibrate panel materials to reproduce sound are known. As an example, Patent Document 1 discloses a vibration device that is disposed between a ceiling interior material and an outer panel of a vehicle and vibrates the ceiling interior material to output sound into the vehicle cabin.

[0003] The vibration device (2) shown in FIG. 5 of Patent Document 1 includes a magnetic circuit section (4), a cylindrical body (5) that holds the magnetic circuit section (4), a coil (32) that is arranged in the magnetic gap of the magnetic circuit section (4), a bobbin section (21 m) around which the coil (32) is wound, a coil support member (21) that includes the bobbin section (21 m), a coupler (22) to which the coil support member (21) is attached and that is fixed to a ceiling interior material (50), a first damper (33) that connects the bobbin section (21 m) 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] Patent Publication No. 2021-29005 Summary of the Invention [Problem to be solved by the invention]

[0005] In the vibration device (2) of Patent Document 1 and Fig. 5 described above, condensation water that falls from the outer panel of the vehicle can adhere to the second damper (34), so it has been desired to add a drip-proof structure. However, it is not easy to add such a drip-proof structure so that it can fit into the narrow space between the vehicle's ceiling interior material and the outer panel.

[0006] Therefore, one example of the 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 preventing the height dimension from increasing. [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 unit attached to the inner side of the cylindrical body, a voice coil arranged in the magnetic gap of the magnetic circuit unit, 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, wherein the drip-proof cover is formed in a ring shape with an opening in the center, is attached to the vibration unit, and is positioned on the outer side of the magnetic circuit unit and above the second damper, and the upper part of the magnetic circuit unit passes through the opening and is positioned above the drip-proof cover. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of an acoustic vibration excitation device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] FIG. 3 is an enlarged view of a main part of FIG. 2. [Figure 4] FIG. 2 is an exploded view of the acoustic excitation device of FIG. 1. [Figure 5] FIG. 5 is a plan view showing a state before the base and flange in FIG. 4 are assembled. [Figure 6] FIG. 6 is a plan view showing the state after the base and flange in FIG. 5 have been assembled. [Figure 7] 6 is a diagram for explaining an assembly structure of the base and flange in FIG. 5. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described below. An acoustic vibration device according to the embodiment of the present invention includes a frame fixed to a panel material, a vibration unit including a cylindrical body and a magnetic circuit unit attached to the inner periphery of the cylindrical body, a voice coil disposed within a magnetic gap of the magnetic circuit unit, 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 opening in the center and is attached to the vibration unit and positioned on the outer periphery of the magnetic circuit unit and above the second damper, with the upper part of the magnetic circuit unit passing through the opening and positioned above the drip-proof cover. In this way, in the present invention, 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 opening in the center and attaching it to the vibration unit, an increase in the height of the device can be suppressed.

[0010] The upper surface of the drip-proof cover is preferably formed to have a downward slope from the inner periphery to the outer periphery, so that water droplets adhering to the drip-proof cover can be guided to the outer periphery and dropped onto the panel material.

[0011] Preferably, the cylindrical body includes a cylindrical portion and a flange portion extending outward from the lower end of the cylindrical portion, the outer periphery of the first damper overlaps the lower surface of the flange portion, the inner periphery of the second damper overlaps the upper surface of the flange portion, and the magnetic circuit portion and the drip-proof cover are attached to the cylindrical portion. This configuration further prevents the height from increasing. [Example]

[0012] 1 to 4 show an acoustic vibration device 1 according to one embodiment of the present invention. The acoustic vibration device 1 is disposed between a ceiling interior material (corresponding to a panel material) 501 of a vehicle and an outer panel 502, and vibrates the ceiling interior material 501 to output sound into the vehicle cabin.

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

[0014] The acoustic vibration device 1 includes 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 includes a base 8 made of synthetic resin that is fixed to a ceiling interior material 501 via double-sided tape 91, and a flange 7 made of synthetic resin that is attached to the base 8.

[0016] The base 8 comprises a plate portion 81 that is overlaid on the ceiling interior material 501 via double-sided tape 91, a ring-shaped rib 82 formed on the upper surface of the plate portion 81, three claws 83 that are connected to the rib 82, a bolt fastening portion 84 that is connected to the outer periphery of the plate portion 81, and three protrusions 85 that protrude inward from the rib 82.

[0017] The flange 7 includes an annular base 71 that is placed inside the rib 82 and 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 protrude outward from the outer periphery 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, a connector portion 76 that is connected to the outer periphery of the second damper mounting portion 72, a capacitor mounting portion 77, a bolt fastening portion 78, etc.

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

[0019] The above-described base 8 and flange 7 are assembled together by turning the flange 7 clockwise from an overlapping state as shown in FIG. 5, so that the convex portions 75 of the flange 7 fit into the grooves 83a of the claws 83 of the base 8 as shown in FIG. 6. As shown in FIG. 7, the grooves 83a of the claws 83 are formed to gradually narrow along the insertion direction (arrow D) of the convex portions 75. Therefore, as the flange 7 is turned, the fit between the claws 83 and the convex portions 75 gradually tightens. As the flange 7 is turned further, the convex portions 75 butt against each other. After the base 8 and flange 7 are assembled in this manner, bolts 92 are fastened to the bolt fastening portions 84, 78 to prevent loosening and secure the base 8 and flange 7 together.

[0020] When repairing the acoustic vibration exciter 1, the flange 7 can be easily separated from the base 8 by removing the bolts 92 and turning the flange 7 counterclockwise.

[0021] The vibration unit 12 includes a cylindrical body 4 made of synthetic resin and a magnetic circuit unit 3 attached to the inner periphery 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 protrusion 43 protruding from the inner peripheral surface of the cylindrical body 4 .

[0023] The magnetic circuit unit 3 includes a yoke 31 made of a magnetic material, a disk-shaped magnet 32, and a disk-shaped plate 33 made of a magnetic material. The yoke 31 includes a disk-shaped overlapping portion 31a overlapping the magnet 32, and a cylindrical side wall 31b hanging down from the outer edge of the overlapping portion 31a. The magnet 32 ​​is overlapped on the inside of the side wall 31b and on the underside of the overlapping portion 31a, and the plate 33 is overlapped on the inside of the side wall 31b and on the underside 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 unit 3 is attached to the inner periphery of the cylindrical portion 41 with the lower end of the side wall 31b of the yoke 31 abutting against the protruding portion 43 of the cylindrical body 4.

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

[0026] The first damper 61 is made of a material in which woven fabric is impregnated with resin and is formed in an annular shape. The first damper 61 includes an inner peripheral portion 61a bonded to the bobbin 51, an outer peripheral portion 61b superimposed on and bonded to the underside of the flange 42 of the cylindrical body 4, and a wavy portion 61c provided between the inner peripheral portion 61a and the outer peripheral portion 61b. In this way, the first damper 61 connects the inner peripheral side of the cylindrical body 4 and the bobbin 51.

[0027] The first damper attachment portion 74 of the flange 7 is bonded to the inner peripheral portion 61a of the first damper 61. The first damper attachment portion 74 of the flange 7 is further bonded to the outer peripheral surface of the bobbin 51.

[0028] The second damper 62 is made of a material in which woven fabric is impregnated with resin and is formed in an annular shape. The second damper 62 has an inner peripheral portion 62a that is superimposed on and bonded to the upper surface of the flange portion 42 of the cylindrical body 4, an outer peripheral portion 62b that is superimposed on and bonded to the second damper mounting portion 72 of the flange 7, and a curved portion 62c that is provided between the inner peripheral portion 62a and the outer peripheral 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 peripheral side of the cylindrical body 4 and the flange 7. The second damper 62 is also disposed outside the first damper 61.

[0029] As described above, the cylindrical body 4 is supported by both the first damper 61 disposed on its inner periphery and the second damper 62 disposed on its outer periphery. By adopting such a configuration, it is possible to suppress the rolling of the vibration excitation unit 12 and also to increase the durability of the acoustic vibration excitation device 1.

[0030] The drip-proof cover 2 is intended to prevent water droplets (condensed water) that have fallen from the outer panel 502 side from adhering to the second damper 62, and in this example, is attached to the cylindrical body 4. The drip-proof cover 2 is made of synthetic resin, and includes a cover main body 21 and an attachment portion 22. The cover main body 21 is formed in an annular shape with an opening in the center. The opening in the center of the cover main body 21 is given the reference numeral 23. The attachment portion 22 is formed in a cylindrical shape, and hangs down from the underside of the cover main body 21 and the outer periphery of the opening 23. The attachment portion 22 is attached to the upper end and outer periphery of the cylindrical portion 41.

[0031] Such a drip-proof cover 2 is disposed on the outer periphery side of the magnetic circuit unit 3 and above the second damper 62. The upper part of the magnetic circuit unit 3 is disposed above the drip-proof cover 2 through the opening 23. The upper surface of the cover body 21 is formed so as to slope downward from the inner periphery side toward the outer periphery side. This allows water droplets adhering to the drip-proof cover 2 to be guided to the outer periphery side and dropped toward the ceiling interior material 501.

[0032] The acoustic vibration device 1 is placed in the narrow space between the ceiling interior material 501 and the outer panel 502 of the vehicle, and there were restrictions on the height dimension when providing the drip-proof cover 2. In order to prevent the height dimension from becoming too large, the drip-proof cover 2 is not a cover that covers the entire vibration unit 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 has a height that does not exceed the top of the magnetic circuit unit 3 (the overlapping portion 31a of the yoke 31), and this drip-proof cover 2 is attached to the cylindrical body 4.

[0033] Furthermore, in order to prevent the cylindrical body 4 from becoming larger in the height direction, the cylindrical body 4 is composed of a cylindrical portion 41, a flange portion 42, and a protrusion portion 43. The first damper 61 is attached to the underside 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 periphery of the cylindrical portion 41, and the attachment portion 22 of the drip-proof cover 2 is attached to the outer periphery of the cylindrical portion 41. With these configurations, it is possible to prevent the overall height direction dimension of the acoustic vibration device 1 from becoming larger.

[0034] Furthermore, by forming the cover body 21 in a ring shape with an opening in the center, it is possible to reduce the weight of the drip-proof cover 2. Also, by exposing the upper part of the magnetic circuit part 3 from the opening 23 of the cover body 21, it is possible to improve heat dissipation.

[0035] In the acoustic vibration device 1 having the above configuration, the driving force is the electromagnetic force generated by supplying an audio current to the voice coil 52, which mainly vibrates the vibration unit 12, which then vibrates the ceiling interior material 501 via the frame 11, thereby outputting sound into the vehicle cabin.

[0036] In the above-described embodiment, the vibration unit 12 includes the cylindrical body 4 and the magnetic circuit unit 3, but the vibration unit of the present invention may include a cylindrical body, a magnetic circuit unit, and other components. Also, in the above-described embodiment, the drip-proof cover 2 is attached to the cylindrical body 4, but in the present invention, the drip-proof cover may be attached to the magnetic circuit unit, or may be attached to a component other than the cylindrical body and the magnetic circuit unit.

[0037] Furthermore, in the above-described embodiment, the acoustic vibration device 1 was attached to the ceiling interior material 501 of the vehicle, but the acoustic vibration device of the present invention can be attached not only to the ceiling interior material of the vehicle, but also to various panel materials that can be vibrated to output sound.

[0038] Although the 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 the present invention also includes design changes within the scope of the present invention. The examples shown in the above figures can be combined with each other as long as there are no particular contradictions or problems in their purpose, configuration, etc. Furthermore, the contents of each figure can each be an independent embodiment, and the embodiment of the present invention is not limited to a single embodiment obtained by combining the figures. [Explanation of symbols]

[0039] 1. Acoustic vibration device 2 Waterproof cover 3 Magnetic circuit section 4 Cylinder 7 flange 8. Base 11 frames 12. Vibration unit 51 Bobbin 52 voice coil 61 First damper 62 Second damper 501 Ceiling interior materials (panel materials) 502 outer panel

Claims

1. A frame fixed to the panel material; a vibrating unit including a cylindrical body and a magnetic circuit unit attached to the inner circumferential side of the cylindrical body; a drip-proof cover that prevents water droplets from falling from above the panel material, The drip-proof cover is attached to the vibration unit, is formed in a ring shape with an opening in the center, and is disposed on the outer periphery of the magnetic circuit unit. An acoustic vibration device characterized by:

2. The upper part of the magnetic circuit portion is passed through the opening and is disposed above the drip-proof cover.

2. The acoustic vibration device according to claim 1.

3. The upper surface of the drip-proof cover is formed to have a downward slope from the inner periphery to the outer periphery.

2. The acoustic excitation device according to claim 1.

4. a voice coil disposed within the magnetic gap of the magnetic circuit portion; 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, The drip-proof cover is disposed above the second damper.

4. The acoustic vibration device according to claim 1, wherein the acoustic vibration device is a vibration device for acoustic vibration.

5. the cylindrical body includes a cylindrical portion and a flange portion extending outward from a lower end of the cylindrical portion, an outer circumferential portion of the first damper overlaps a lower surface of the flange portion; an inner circumferential portion of the second damper overlaps an upper surface of the flange portion; The magnetic circuit unit and the drip-proof cover are attached to the cylindrical portion.

5. The acoustic excitation device according to claim 4.

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