JP7581602B2 - Exciter - Google Patents

Description

The present invention relates to an exciter.

Patent Document 1 is known as a technique relating to high-pitched sound output from an exciter.
In the abstract of Patent Document 1, the "Problem" section states, "To provide an exciter capable of outputting high-frequency sounds with high quality." The "Solution" section states, "An exciter 1 includes a vibrating body 2 having a yoke and a magnet, a frame 3 in which the vibrating body 2 is disposed via a damper 4, and a voice coil bobbin 5 that is disposed inside the frame 3 and has the other end 5b extended to the vicinity of the vibrating body 2, and a voice coil 11 provided at the other end 5b. An opening 3b is formed in the frame 3, and the voice coil bobbin 5 is attached to the periphery of the opening 3b such that one end 5a of the voice coil bobbin 5 is open to the outside of the frame through the opening 3b. A vibrating member 10 is provided on the voice coil bobbin 5 so as to cover the open portion."

JP 2016-76763 A

In the configuration of Patent Document 1, the vibrating member 10 that outputs high-pitched sounds is affected by the vibration of the vibrating body 2, and there is a risk that distortion will occur in the high-pitched sounds.
In addition, although the voice coil bobbin 5 extends from the opening 3a of the frame 3 to the vicinity of the vibrating body 2 arranged inside the frame 3, thereby transmitting the vibrations of the vibrating body 2 to the vibrating member 10, the distance from the vibrating body 2 to the vibrating member 10 is relatively long, making it difficult for fine vibrations to be transmitted to the vibrating member 10.

The objective of the present invention is to provide an exciter that can reproduce high-pitched sounds with high quality.

One aspect of the present invention is a first vibrating body having a first yoke and a first magnet provided on the first yoke, and being provided inside a frame via a damper; a second yoke provided on the frame so as to cover an opening formed in the frame from the inside of the frame, the second yoke having a recess recessed toward the inside of the frame, and a second magnet provided on the second yoke; a vibrating member provided so as to cover the opening of the frame from the outside of the frame via an edge; a cylindrical first voice coil bobbin having one end attached to the recess of the second yoke and provided inside the frame, the other end extended to the vicinity of the first vibrating body, and a first voice coil provided on the other end; and a vibration member connected to the first voice coil. and a cylindrical second voice coil bobbin, one end of which is attached to the edge of the frame and installed in the opening of the frame, the other end of which extends to the vicinity of the second vibrating body and has a second voice coil attached to the other end. The first vibrating body vibrates in response to an acoustic signal flowing through the first voice coil, and the vibration of the first vibrating body is transmitted to the frame via the damper, thereby outputting sound through a transmission medium on which the frame is installed. The exciter is characterized by having a first vibration part, and a second vibration part, which outputs a sound in a higher frequency range than the first vibration part into the air by vibrating the second vibrating body in response to an acoustic signal flowing through the second voice coil and transmitting the vibration of the second vibrating body to the vibration member.

The present invention makes it possible to reproduce high-pitched sounds with high quality.

1 is a perspective view showing a configuration of an exciter according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the internal configuration of an exciter. 1 is a schematic diagram showing a state in which an exciter is installed in a vehicle cabin. FIG. 4 is a schematic diagram showing an internal configuration of an exciter according to a first modified example of the present invention. FIG. 11 is a schematic diagram showing the internal configuration of an exciter according to a second modified example of the present invention. FIG. 13 is a schematic diagram showing the internal configuration of an exciter according to a third modified example of the present invention. FIG. 13 is a schematic diagram showing the internal configuration of an exciter according to a fourth modified example of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the configuration of an exciter 1 according to this embodiment.
As shown in FIG. 1, the exciter 1 is a speaker that has two vibration parts, a first vibration part 10 and a second vibration part 20, which vibrate based on an acoustic signal applied from the outside, and is installed on an appropriate transmission medium 60 (FIG. 3).
This exciter 1 outputs sound through a transmission medium 60 by vibration of a first vibration part 10, and outputs a higher-pitched sound (hereinafter referred to as "treble") than the sound output through this transmission medium 60 into the air by vibration of a second vibration part 20, thereby reproducing a wide frequency band of sound from high to low pitches.

As shown in FIG. 1, the exciter 1 of this embodiment has a bottomed cylindrical frame 4 having a bottom surface portion 4A, and a damper 5 provided on the open end of the frame 4 (hereinafter referred to as the upper end portion 4B). The first vibration part 10 is disposed on the top surface side of the frame 4 via the damper 5, and the second vibration part 20 is disposed on the bottom surface portion 4A of the frame 4, so that the first vibration part 10 and the second vibration part 20 are disposed one above the other.

FIG. 2 is a schematic diagram showing the internal configuration of the exciter 1. As shown in FIG.
The first vibrating portion 10 includes a first vibrating body 12 and a first voice coil bobbin 13 , and the first vibrating body 12 is disposed within the frame 4 via the damper 5 .
The first vibrating body 12 includes a first yoke 14 made of a magnetic material, a disk-shaped first magnet 15, and a disk-shaped first metal plate 16 made of a metal material, which form a magnetic circuit.
The first yoke 14 is cylindrical with a top and has a circular top surface 14A and a cylindrical side wall 14B. The first magnet 15 is adhered to the top surface 14A1 of the top surface 14A with an adhesive, and the first metal plate 16 is adhered to the first magnet 15 with an adhesive so as to be stacked on top of the first magnet 15.
The diameters of the first magnet 15 and the first metal plate 16 are both large enough to form a gap between them and the side wall portion 14B of the first yoke 14, and this gap forms a first magnetic gap g1 of the magnetic circuit.

The first vibrating body 12 has dampers 5 connected to each of the outer peripheral surface 14B1 and the open end portion 14B2 of the side wall portion 14B of the first yoke 14, and the first vibrating body 12 is elastically supported on the top surface side of the frame 4 by these dampers 5.
Each of the dampers 5 is a metal plate-like member having a rigidity sufficient to support the first vibrating body 12, and is configured to transmit the vibration of the first vibrating body 12 to the frame 4 with as little attenuation as possible. The damper 5 in this embodiment is configured by providing a large number of appropriately shaped slit holes 5A (FIG. 1) for increasing elasticity within the surface of a thin plate-like base material made of, for example, stainless steel.

As shown in FIG. 2, the first voice coil bobbin 13 is a cylindrical member installed inside the frame 4 and is made of a material with high thermal conductivity (e.g., metal). One end 13A of the first voice coil bobbin 13 is fixed to a recess 24D of a second yoke 24 provided in a second vibrating body 22 described later, and a first voice coil 17 through which an acoustic signal flows is wound around the outer circumferential surface of the other end 13B. By extending this other end 13B to the vicinity of the first vibrating body 12, the first voice coil 17 is disposed within the first magnetic gap g1 of the first vibrating body 12.

In the first vibration section 10 configured as described above, when an acoustic signal flows through the first voice coil 17, a Lorentz force corresponding to the acoustic signal is generated between the first voice coil 17 and the first vibrating body 12, causing the first voice coil 17 and the first vibrating body 12 to vibrate. The vibration of the first vibrating body 12 is transmitted to the frame 4 via the damper 5, and the vibration is transmitted to the transmission medium 60 to which the frame 4 is fixed, and sound is output from the transmission medium 60.

Next, the second vibration portion 20 will be described in detail.
As shown in FIG. 2, a circular opening 6 is formed in the bottom surface 4A of the frame 4, and a second vibrating part 20 is disposed in this opening 6.
The second vibrating section 20 of the present embodiment includes a second vibrating body 22 , a second voice coil bobbin 23 , and a vibrating member 21 .

The second vibrating body 22 is a component disposed within the frame 4, and includes a second yoke 24 made of a magnetic material with high thermal conductivity (iron in this embodiment), a disk-shaped second magnet 25, and a disk-shaped second metal plate 26 made of a metal material, which together form a magnetic circuit.
The second yoke 24 is dish-shaped and has a circular top surface 24A, a cylindrical side wall 24B, and an annular flange 24C, and the top surface 24A and the side wall 24B form a recess 24D that is recessed toward the inside (the bottom surface 4A side) of the frame 4. The second yoke 24 has the second magnet 25 bonded to a top surface 24A1 of the top surface 24A with an adhesive, and the second metal plate 26 bonded to the second magnet 25 with an adhesive so as to be stacked on top of the second magnet 25.
The diameters of the second magnet 25 and the second metal plate 26 are large enough to form a gap between them and the side wall portion 24B of the second yoke 24, and this gap forms a second magnetic gap g2 of the magnetic circuit.

The flange portion 24C of the second yoke 24 is bonded to the frame 4 with an adhesive so that the recess 24D covers the opening 6 of the bottom surface portion 4A from the inside of the frame 4. This places the second vibrating body 22 at a position facing the opening 6 inside the frame 4.
Moreover, one end 13A of the cylindrical first voice coil bobbin 13 provided in the first vibrating part 10 is fitted into the cylindrical recess 24D of the second yoke 24, and the second yoke 24 and the first voice coil bobbin 13 are fixed with an adhesive. According to this fixing structure, the position of the first voice coil bobbin 13 is determined by the position of the second yoke 24, so that the position of the first voice coil bobbin 13 can be easily determined.

An edge 7 is provided on the edge of the opening 6. The edge 7 is a member for attaching the vibrating member 21 to the frame 4 without significantly reducing the vibration of the vibrating member 21. The edge 7 forms a ring shape surrounding the opening 6 and is fixed to the bottom surface portion 4A of the frame 4. The vibrating member 21 of the second vibrating part 20 and the second voice coil bobbin 23 are both connected to the edge 7.

The second voice coil bobbin 23 is a cylindrical member, one end 23A of which is connected to the edge 7, and the second voice coil 27 through which the acoustic signal flows is wound around the outer circumferential surface of the other end 23B. The other end 23B of the second voice coil bobbin 23 is extended to the vicinity of the second vibrating body 22, so that the second voice coil 27 is disposed within the second magnetic gap g2 of the magnetic circuit of the second vibrating body 22.

The vibrating member 21 is a member used in the dome portion of a speaker dedicated to high-frequency output (i.e., a tweeter), and is, for example, a dome-shaped member made of silk. This vibrating member 21 is connected to the edge 7 so as to cover the opening 6 from the outside of the frame 4. Note that the material of the vibrating member 21 may be other than silk.

In the second vibration section 20 configured as described above, when an acoustic signal flows through the second voice coil 27, a Lorentz force corresponding to the acoustic signal is generated between the second voice coil 27 and the second vibration body 22, causing the second voice coil 27 and the second vibration body 22 to vibrate. The vibration of the second voice coil 27 is transmitted to the vibration member 21 via the second voice coil bobbin 23, and the acoustic signal is converted into air vibration (physical vibration) by the vibration of the vibration member 21, and sound is output into the air via the vibration member 21. As described above, the vibration member 21 is the same material as that used for the dome portion of a speaker dedicated to high-frequency output, so the sound output by the vibration member 21 is higher-pitched than that of the first vibration section 10.

In addition, in the second vibrating section 20, the vibrating member 21 and the second voice coil bobbin 23 are not fixed directly to the frame 4, but are fixed via the edge 7. As a result, the vibration of the second vibrating section 20 is less affected by the vibration of the frame 4 caused by the first vibrating section 10, and high-quality high-pitched sounds with less distortion are reproduced.

Furthermore, the vibrating member 21 is connected to a second voice coil bobbin 23 extending from a second vibrating body 22 arranged in the opening 6, rather than to the first voice coil bobbin 13 of the first vibrating section 10. The second voice coil bobbin 23 can make the distance from the vibrating member 21 on one end 23A side to the second voice coil 27 on the other end 23B shorter than that of the first voice coil bobbin 13. In other words, compared to a configuration in which the vibrating member 21 is connected to the first voice coil bobbin 13, finer vibrations are more easily transmitted to the vibrating member 21, and a finer high-pitched sound can be output.

FIG. 3 is a schematic diagram showing a state in which the exciter 1 is installed in the passenger compartment of a vehicle 70. As shown in FIG.
Vehicle 70 includes roof panel 71 constituting a roof, and plate-shaped interior material 72 forming the ceiling surface inside the vehicle cabin, and exciter 1 is disposed in an overhead space Sa between roof panel 71 and interior material 72. Specifically, exciter 1 is fixed at bottom surface portion 4A of frame 4 onto a surface of interior material 72 with, for example, double-sided tape, and interior material 72 is used as transmission medium 60. Furthermore, interior material 72 is formed with an opening 73 for outputting high-pitched sounds to vehicle cabin space Sb, and vibrating member 21 of second vibrating section 20 is disposed in opening 73 when exciter 1 is fixed.

In this installed state, the first vibrating part 10 of the exciter 1 vibrates, causing the interior material 72, which is the transmission medium 60, to vibrate, and sound is output to the vehicle interior space Sb via the interior material 72. The second vibrating part 20 also vibrates, causing the vibrating member 21 to vibrate, and high-pitched sound is output to the vehicle interior space Sb from the opening 73 of the interior material 72 (transmission medium 60).

With this configuration, even if the material of the interior material 72 of the vehicle 70 is not suitable for reproducing high-pitched sounds (e.g., plastic, etc.), high-pitched sounds are output by the second vibration part 20, which is different from the first vibration part 10, so that sounds over a wide frequency band from low to high pitches are reproduced in the vehicle interior space Sb.

The above-described embodiment provides the following advantages:

The exciter 1 of this embodiment comprises a first vibration part 10 that outputs sound via a transmission medium 60 by vibrating a first vibrating body 12 in response to an acoustic signal flowing through a first voice coil 17 provided on a first voice coil bobbin 13, and a second vibration part 20 that outputs a higher pitch than the first vibration part 10.
The second vibrating section 20 comprises a vibrating member 21 and a second voice coil bobbin 23 having the vibrating member 21 at one end 23A and a second voice coil 27 at the other end 23B, and is configured to output sound by transmitting vibration of the second voice coil bobbin 23 in response to an acoustic signal flowing through the second voice coil 27 to the vibrating member 21.

This configuration eliminates the need to provide a speaker for outputting high-pitched sounds separately from the exciter 1, which saves space and reduces the number of parts, thereby reducing costs.

In addition, in the second vibrating section 20, the vibrating member 21 and the second voice coil bobbin 23 are not directly fixed to the frame 4, but are attached to the frame 4 via an edge 7. This makes it difficult for the vibration of the second vibrating section 20 to be affected by the vibration of the frame 4 caused by the first vibrating section 10, making it possible to output high-quality high-pitched sounds with less distortion.

In addition, one end 13A of the first voice coil bobbin 13 is fixed to the recess 24D of the second yoke 24, making it easy to position the first voice coil bobbin 13.

In the exciter 100 of the present embodiment, the second voice coil bobbin 23 has a length from one end 23A to the other end 23B that is shorter than that of the first voice coil bobbin 13 .
According to this configuration, fine vibrations are more easily transmitted to the vibrating member 21 than in a configuration in which the vibrating member 21 is connected to the first voice coil bobbin 13, and a finer, higher quality high-pitched sound can be output.

The above-described embodiment is merely an example of one aspect of the present invention, and any modification or application is possible without departing from the spirit of the present invention.

[First Modification]
4 is a diagram showing a schematic internal configuration of an exciter 100 according to this modified example. In the figure, the same reference numerals are used to designate the same members as those already described, and the description thereof will be omitted.
The exciter 100 is the exciter 1 of the above-described embodiment, except that a second damper 170 is provided in addition to the damper 5 .
The second damper 170 is a member for supporting the first vibrating body 12 on the frame 4, and is made by molding a fiber base material into an appropriate shape (typically a corrugated shape) that has a dust-collecting property capable of preventing the intrusion of dirt and dust into the inside of the frame 4 and has breathability. For such a base material, a cloth woven with blended yarn and impregnated with a thermosetting resin such as a phenolic resin, or "Conex" (registered trademark), a meta-aramid fiber manufactured by Teijin Limited, can be used.

In the exciter 100, the second damper 170 is positioned inside the frame 4 (towards the bottom portion 4A) of the damper 5 provided at the upper end portion 4B of the frame 4 so as to be located at the open end of the frame 4.
According to this arrangement, any particles that have entered the frame 4 through the slits 5A of the damper 5 are collected by the second damper 170 and prevented from entering the inside of the frame 4. As a result, the sound quality of the exciter 100 is not affected by particles that have entered the frame 4.
In addition, since the second damper 170 has air permeability, heat is not trapped inside the exciter 1.

In this modified example, either of the two dampers 5 may be replaced with a second damper 170.

[Second Modification]
5 is a diagram showing a schematic internal configuration of an exciter 200 according to this modified example. In the figure, the same reference numerals are used to designate the same members as those already described, and the description thereof will be omitted.
The exciter 200 is formed into a cylindrical shape with a bottom and a top that contains the first vibrating body 12 and the second vibrating body 22, by providing a top surface portion 175 that closes the open side of the frame 4 in the exciter 1 of the above-mentioned embodiment.
According to this modified example, the entire first vibrating part 10, such as the damper 5 that supports the first vibrating body 12 on the frame 4, is contained within the frame 4. Therefore, even if the damper 5 has a slit hole 5A (FIG. 1), it is possible to reliably prevent intrusion into the inside of the frame 4.

[Third Modification]
6 is a diagram showing a schematic internal configuration of an exciter 300 according to this modified example. In the figure, the same reference numerals are used to designate the same members as those already described, and the description thereof will be omitted.
The exciter 300 is configured such that in the exciter 1 of the above-described embodiment, a second opening 177 having an appropriate shape in a plan view is formed in the bottom surface portion 4A of the frame 4, and the flange portion 24C of the second yoke 24 is disposed within the frame 4 so as to block the second opening 177 from the inside, thereby exposing the flange portion 24C to the outside air through the second opening 177. In the bottom surface portion 4A, the second opening 177 is provided at a position that is not covered by the edge 7, i.e., on the outer circumferential side of the edge 7.

In the exciter 300, the first voice coil bobbin 13 and the second yoke 24 are made of a material having high thermal conductivity. Therefore, the heat generated by the first voice coil bobbin 13 and the first voice coil 17 is transmitted to the second yoke 24 and dissipated to the outside through the second opening 177.
This prevents heat from building up inside the frame 4.
Furthermore, since the second opening 177 is closed by the second yoke 24 , it is possible to prevent fine dust from entering the inside of the frame 4 through the second opening 177 .

In the exciter 300 of this modified example, the open side of the frame 4 may be closed by the top surface portion 175, similar to the second modified example.
This reliably prevents the intrusion of fine dust into the interior of the frame 4 while preventing heat buildup by dissipating heat from the second opening 177 .
Moreover, in the exciter 300 of this modified example, a second damper 170 may be provided, similarly to the first modified example.

[Fourth Modification]
7 is a diagram showing a schematic internal configuration of an exciter 400 according to this modified example. In the figure, the same reference numerals are used to designate the same members as those already described, and the description thereof will be omitted.
The exciter 400 is the exciter 300 of the third modified example described above, except that the first vibrating body 12 is provided with a third magnet 178 in order to increase the magnetic flux of the magnetic circuit of the first vibrating part 10. The third magnet 178 and the first magnet 15 are disposed with the same poles facing each other with the first metal plate 16 interposed therebetween, thereby forming a repulsive magnetic circuit.
Furthermore, the exciter 400 includes a fourth magnet 179 provided on the second yoke 24 of the second vibrating body 22, and this fourth magnet 179 is disposed opposite the third magnet 178 so that their like poles face each other and repel each other.
According to this exciter 400, by providing the third magnet 178 in the first vibrating part 10, even if the gap between the first vibrating body 12 (third magnet 178) of the first vibrating part 10 and the second vibrating body 22 of the second vibrating part 20 becomes narrow, it is possible to prevent malfunctions such as the third magnet 178 of the first vibrating body 12 being attracted to the second vibrating body 22 when the first vibrating body 12 vibrates.

The third magnet 178 and fourth magnet 179 of this modified example can be provided not only in the exciter 300 of the third modified example, but also in the exciter 1 of the above-mentioned embodiment, the exciter 100 of the first modified example, and the exciter 200 of the second modified example.

[Other Modifications]
In the above-mentioned embodiment, the description of the directions such as horizontal and vertical, various numerical values, and shapes does not exclude the surroundings of the directions, the surroundings of the numerical values, and approximate shapes unless otherwise specified. In other words, the directions, numerical values, and shapes in the embodiment include the surroundings of the directions, the surroundings of the numerical values, and approximate shapes (so-called equivalent ranges) as long as they have the same action and effect as these directions, numerical values, and shapes.

1, 100, 200, 300, 400 Exciter 4 Frame 5 Damper 5A Slit hole 6 Opening 7 Edge 10 First vibrating part 12 First vibrating body 13 First voice coil bobbin 14 First yoke 15 First magnet 17 First voice coil 20 Second vibrating part 21 Vibrating member 22 Second vibrating body 23 Second voice coil bobbin 24 Second yoke 24D Recess 25 Second magnet 27 Second voice coil 60 Transmission medium 170 Second damper 177 Second opening 178 Third magnet 179 Fourth magnet

Claims (6)

a first vibrating body having a first yoke and a first magnet provided on the first yoke and disposed within a frame via a damper;
a second vibrating body including a second yoke provided on the frame so as to cover an opening formed in the frame from the inside of the frame and having a recess recessed toward the inside of the frame, and a second magnet installed on the second yoke;
a vibration member installed so as to cover the opening of the frame from the outside of the frame via an edge;
a cylindrical first voice coil bobbin, one end of which is attached to the recess of the second yoke and disposed inside the frame, the other end of which extends to the vicinity of the first vibrating body, and a first voice coil is provided at the other end;
a cylindrical second voice coil bobbin, one end of which is attached to the edge to which the vibrating member is connected, and which is disposed in the opening of the frame, and the other end of which is extended to the vicinity of the second vibrating body, and a second voice coil is provided at the other end;
having
a first vibration unit in which the first vibrating body vibrates in response to an acoustic signal flowing through the first voice coil, and the vibration of the first vibrating body is transmitted to the frame via the damper, thereby outputting sound via a transmission medium on which the frame is installed;
a second vibration section that outputs a higher-pitched sound than the first vibration section into the air by the second vibration body vibrating in response to an acoustic signal flowing through the second voice coil and transmitting the vibration of the second vibration body to the vibration member;
An exciter comprising: The exciter of claim 1, characterized in that it comprises a damper made of metal and a second damper made of fiber connected to the first vibrating body. The frame is
The damper, the first vibrating body, and the second vibrating body are contained therein.
2. The exciter of claim 1 . An exciter according to any one of claims 1 to 3, characterized in that the frame has a second opening that is closed from the inside by the second yoke. The first vibrating body is
A third magnet is provided, the third magnet being disposed so that the poles of the third magnet face each other, and the third magnet is disposed so that the poles of the third magnet face each other.
The second vibrator is
a fourth magnet disposed at a position opposite to the third magnet;
The third magnet and the fourth magnet are arranged so that the same poles face each other.
5. An exciter according to claim 1, wherein the exciter is a casing. An exciter according to any one of claims 1 to 5, characterized in that the second voice coil bobbin has a length from the one end to the other end that is shorter than that of the first voice coil bobbin.

Images