JP2021010095A - Acoustic vibration device and on-vehicle acoustic device using the same - Google Patents

Abstract

To provide an acoustic vibration device which can be made thin as a whole, and furthermore in which a lead wire end extending from a coil arranged in a vibration part can be stably connected to a terminal part, and an on-vehicle acoustic device using the same.SOLUTION: A bobbin 21 is fixed to a vibration transmission part 20 fixed to an interior material of a vehicle, and a coil 23 wound around the bobbin 21 is located in a magnetic gap in a magnetic circuit part of a mass part 10. A terminal part 25 fixed to the vibration transmission part 20 is arranged in a position that does not overlap with the vibration transmission part 20 in the front-back direction. Lead wire ends 23a, 23b extending from the coil 23 extend along a surface 21a of the bobbin 21 and a surface of the vibration transmission part 20, and are connected to the terminal part 25.SELECTED DRAWING: Figure 2

Description

The present invention relates to an acoustic vibration device that vibrates a vibration transmission unit by an electromagnetic force between a magnetic circuit unit and a coil, and an in-vehicle acoustic device in which an interior material of a vehicle is vibrated by the vibration device.

In the in-vehicle sound device, a vibration device called an exciter that vibrates and sounds the interior material of the vehicle is used. Patent Document 1 describes an invention relating to an exciter used for a speaker for driving an interior material.

The exciter described in Patent Document 1 is provided with a magnetic circuit in which a yoke, a magnet, and a plate are overlapped, and a gap portion is formed between the yoke and the plate. A voice coil bobbin that holds the voice coil is supported by a coupler coupled to the interior material of the vehicle, and the voice coil is located inside the gap portion. The coupler is oscillated by a magnetic circuit by a leaf spring. In this exciter, the vibration generated between the magnetic circuit and the coupler is transmitted from the coupler to the interior material, and the interior material generates sound pressure.

Japanese Unexamined Patent Publication No. 2005-130186

In an in-vehicle vibration exciter (exciter), it is necessary to provide a terminal on the coupler side, connect the lead wire terminal of the voice coil to the terminal, and connect the wiring from the outside to the terminal portion. However, since the voice coil vibrates in the gap portion of the magnetic circuit, the lead wire terminal may be damaged by the vibration or the wire may be broken at the connection portion with the terminal. FIGS. 2 and 4 of Patent Document 1 describe a structure in which a terminal portion is fixed on the coupler side, but the use of this terminal portion is unknown, and how the wiring is a terminal. It is not stated whether it is connected to the part.

The present invention solves the above-mentioned conventional problems, and arranges the terminal portion provided in the vibration transmission portion so as not to hit the mass portion, enables thinning, and further floats the wire terminal of the coil in space. It is an object of the present invention to provide an acoustic vibration device and an in-vehicle acoustic device using the vibration device, which can be connected to a terminal portion without any trouble and can prevent damage or disconnection of a wiring portion.

In the present invention, a mass portion located at the rear, a magnetic circuit portion provided at the mass portion, a vibration transmitting portion located at the front, a damper connecting the mass portion and the vibration transmitting portion, and the vibration. In an acoustic vibration device including a bobbin extending rearward from a transmission unit and a coil supported by the bobbin and located in a magnetic gap of the magnetic circuit unit.
A terminal portion conducting to the coil is fixed to the vibration transmitting portion, and the terminal portion is provided at a position where it does not overlap with the mass portion in the front-rear direction.
It is characterized in that the lead wire terminal of the coil extends along the surface of the bobbin and the surface of the vibration transmitting portion facing rearward and is connected to the terminal portion.

In the acoustic vibration device of the present invention, it is preferable that at least a part of the lead wire terminal is adhered to the surface of the bobbin and the surface of the vibration transmission portion.

In the acoustic exciter of the present invention, the damper spreads in a direction intersecting the winding center line of the coil, the inner peripheral end is fixed to the bobbin, and the outer peripheral end is fixed to the mass portion. ,
The lead wire terminal can be configured as passing between the bobbin and the inner peripheral end of the damper.

In the acoustic vibration device of the present invention, it is preferable that the terminal portions are arranged on both sides of the winding center line.

Next, the in-vehicle acoustic device of the present invention includes any of the above-mentioned vibration exciters.
The vibration transmitting portion is fixed to the interior material of the vehicle.

In the present invention, since the terminal portion provided in the vibration transmitting portion is provided at a position where it does not overlap with the mass portion in the front-rear direction, the terminal portion is massed when the mass portion and the vibration transmitting portion vibrate relatively. It does not hit the club. Therefore, the mass part and the vibration transmitting part can be brought close to each other as much as possible, and the entire device can be made thin.

In addition, since the wire terminal extending from the coil located in the magnetic gap is wired along the surface of the bobbin and the surface facing the rear of the vibration transmission portion, the wire terminal is less likely to float in space, and vibration It is less susceptible to damage and less likely to cause damage or disconnection of the wiring.

A perspective view showing an in-vehicle acoustic device in which the acoustic vibration device of the present invention is fixed to an interior material of a vehicle. An exploded perspective view of the vibration exciter shown in FIG. Longitudinal sectional view of the in-vehicle audio device shown in FIG.

As shown in FIGS. 1 and 3, the vehicle-mounted acoustic device (vehicle-mounted speaker) 1 according to the embodiment of the present invention includes a vibration device 2 for sound and an interior material 3 of a vehicle to which the vibration device 2 is attached. have. The interior material 3 is, for example, a roof interior material. The roof interior material is a soft sheet and is formed of a foamed resin sheet such as urethane foam resin. The interior material 3 may be, for example, an interior material for an automobile door or another interior material other than the roof interior material.

In the vibration exciting device 2 for sound and the vehicle-mounted sound device 1, the lower direction (Y1 direction) in the drawing is the front, and the upper direction (Y2 direction) in the drawing is the rear. The vehicle interior is in front of the interior material 3 (in the Y1 direction). In the in-vehicle sound device 1, the interior material 3 of the vehicle functions as a main vibrating body, and the sound pressure is generated by the vibration of the interior material 3, which is sounded toward the vehicle interior.

As shown in FIGS. 1 and 3, the vibration exciter 2 has a mass portion 10 and a vibration transmission portion 20. As shown in FIG. 3, the mass portion 10 has a magnetic circuit portion 11 and a holding member 15 that holds the magnetic circuit portion 11. The magnetic circuit unit 11 includes a disk-shaped magnet 12, a first yoke 13 on which the surface facing the rear (Y2 direction) of the magnet 12 is fixed, and a disk on which the surface facing the front (Y1 direction) of the magnet 12 is fixed. It has a second yoke 14 having a shape. The first yoke 13 and the second yoke 14 are made of a ferrite-based or iron-based magnetic material. A partially cylindrical side wall portion 13a bent toward the front (Y1 direction) is formed on the outer peripheral portion of the first yoke 13, and the outer surface of the outer circumference of the second yoke 14 and the inner surface of the side wall portion 13a are formed. A magnetic gap G is formed between them.

The holding member 15 has a cylindrical shape, and the outer peripheral surface of the side wall portion 13a of the first yoke 13 is held and fixed to the inner peripheral surface thereof. The holding member 15 is preferably formed of a non-magnetic material such as a synthetic resin material or a non-magnetic alloy, but may be formed of a magnetic material.

The vibration transmission unit 20 has a transmission support 22, a bobbin 21 whose front end is fixed to the transmission support 22, and a coil (voice coil) 23 wound around the rear end of the bobbin 21. The transmission support 22 functions as a coupler fixed to the interior material 3. As shown in FIG. 3, the coil 23 is located in the magnetic gap G of the magnetic circuit unit 11. The transmission support 22 is made of a non-magnetic material such as a synthetic resin material and is made of a non-conductive material.

1 and 2 and 3 show a center line O extending in the front-rear direction (Y1-Y2 direction) of the vibration exciter 2. The center line O passes through the winding center of the coil 23 at the center of the bobbin 21, and further passes through the center of gravity of the mass portion 10.

A damper (suspension) 31 is provided between the bobbin 21 that constitutes the vibration transmitting portion 20 and the holding member 15 that constitutes the mass portion 10. The damper 31 is formed of a woven fabric of chemical fibers or a composite of a non-woven fabric and a phenol resin. The damper 31 has a ring shape as a whole, and has a corrugated shape in which a plurality of ring-shaped protrusions and a plurality of ring-shaped recesses are arranged concentrically in the radial direction. The damper 31 is arranged so as to spread along a plane orthogonal to the center line O, the inner peripheral end 31a of the damper 31 is adhered and fixed to the outer peripheral surface of the bobbin 21, and the outer peripheral end 31b of the damper 31 is held. It is adhered and fixed to the lower surface of the member 15.

As shown in FIGS. 1 and 3, the transmission support 22 of the vibration transmission unit 20 has a disk-shaped flange portion 22a, and an opening 22b is formed in the central portion thereof. A raised portion 22d that rises rearward (in the Y2 direction) is formed around the opening 22b, and an end portion of the bobbin 21 that faces the front (Y1 direction) is fitted to the outer peripheral portion of the raised portion 22d. The bobbin 21 is adhesively fixed and stands up from the transmission support 22 toward the rear (Y2 direction). The flange portion 22a of the transmission support 22 has a diameter dimension larger than the diameter of the mass portion 10. The outer peripheral portion of the transmission support 22 is an overhanging portion extending toward the outer peripheral side of the mass portion 10, and a pair of terminal portions 25 are fixed to the overhanging portion. The terminal portion 25 is a connection terminal formed of a conductive metal plate, and a base end portion facing forward (Y1 direction) is embedded and fixed in a flange portion 22a of the transmission support 22.

The pair of terminal portions 25 are arranged on both sides of the center line O at an angle of approximately 180 degrees about the center line O. Each terminal portion 25 rises rearward from the rearward facing surface 22c of the flange portion 22a formed on the transmission support 22 of the vibration transmission portion 20. The pair of terminal portions 25 are located on the outer peripheral side of the mass portion 10, and the pair of terminal portions 25 and the mass portion 10 do not overlap in the front-rear direction (Y1-Y2 direction) and do not face each other in the front-rear direction. ..

As shown in FIG. 2, a pair of lead wire terminals 23a and 23b extend from the coil 23. The wire terminals 23a and 23b are both ends of the covered wire forming the coil 23, one of the wire terminals 23a and 23b is the winding start end of the coil 23, and the other is the winding end of the coil 23. The lead wire terminals 23a and 23b extend from the coil 23 toward the front (Y1 direction) in parallel with the center line O and extend along the surface (outer peripheral surface) 21a of the bobbin 21. Further, it extends in a linear direction in the radial direction with respect to the center line O along the surface 22c of the flange portion 22a of the transmission support 22 which is the surface facing the rear (Y2 direction) of the vibration transmission portion 20. The coating layer is removed from the tips of the wire terminals 23a and 23b, and the tips are wound around the terminal 25, so that the wire terminals 23a and 23b and the pair of terminals 25 and 25 are soldered to each other. Has been done.

At least a part of the lead wire terminals 23a and 23b is adhered to the surface 21a of the bobbin 21 and also adhered to the surface 22c of the flange portion 22a. Preferably, the lead wire terminals 23a and 23b have a total length. Alternatively, it is adhered and fixed to the surface 21a of the bobbin 21 and the surface 22c of the flange portion 22a in almost the entire length. As shown in FIG. 3, since the inner peripheral end 31a of the damper 31 is adhered and fixed to the surface 21a of the bobbin 21, the lead wire terminals 23a and 23b extending forward along the surface 21a of the bobbin 21 are It passes through the joint portion between the inner peripheral end 31a of the damper 31 and the surface 21a of the bobbin 21 and extends toward the flange portion 22a.

Next, the sounding operation of the in-vehicle sound device (speaker) 1 using the vibration device 2 according to the embodiment of the present invention will be described.

When a voice current is applied to the coil 23, the mass portion 10 and the vibration transmission portion 20 are moved by the magnetic field acting on the coil 23 in the magnetic gap G of the magnetic circuit unit 11 and the electromagnetic force excited by the voice current. It tries to vibrate in the direction of repulsion from each other in the front-back direction (Y1-Y2 direction). The energy generated by the reaction force of the vibration of the mass portion 10 at this time is given to the interior material 3 of the vehicle from the transmission support 22 of the vibration transmission unit 20, and the interior material 3 is vibrated to generate sound pressure, and the interior material is generated. Sound is given to the passenger compartment in front of 3.

The wire terminals 23a and 23b extend from the vibrating coil 23, and the wire terminals 23a and 23b pass through the joint between the inner peripheral end 31a of the damper 31 and the surface 21a of the bobbin 21. At least a part of the bobbin 21 is adhered to the surface 21a along the surface 21a. Further, the wire terminals 23a and 23b extend radially along the surface facing the rear (Y2 direction) of the vibration transmission unit 20, that is, the surface 22c of the flange portion 22a of the transmission support 22, and the wire terminals 23a and 23b are at least one. The portion is adhered to the surface 22c of the flange portion 22a and connected to the terminal portion 25.

Since the wire terminals 23a and 23b do not float in the air from the coil 23 to the terminal 25 and extend through the joint between the bobbin 21 and the damper 31, the wire terminal 23a when the coil 23 vibrates. , 23b remain fixed without moving alone. Therefore, the wire terminals 23a and 23b are not damaged by the vibration, a large force is not applied to the connection portion between the wire terminals 23a and 23b and the terminal portion 25, and there is almost no possibility of disconnection.

As shown in FIG. 3, the flange portion 22a of the transmission support 22 fixed to the interior material 3 has an overhanging portion that projects laterally from the mass portion 10, and the terminal portions 25 and 25 extend to the overhanging portion. It is fixed. The terminal portions 25, 25 protruding from the flange portion 22a toward the rear (Y2 direction) do not overlap the mass portion 10 in the front-rear direction (Y1-Y2 direction) and do not face each other in the front-rear direction. When the 10 and the vibration transmitting portion 20 vibrate relatively in the front-rear direction, the mass portion 10 and the terminal portion 25 do not come into contact with each other. Therefore, the mass portion 10 and the vibration transmission portion 20 can be arranged close to each other in the front-rear direction, and the vibration exciter 2 can be made thinner.

In the vibration transmission unit 20, since the pair of terminal units 25 are arranged on both sides of the center line O, the pair of lead wire terminals 23a and 23b extending from the coil 23 can be wired at locations independent of each other. There is no entanglement between the wire terminals 23a and 23b. Further, since the metal terminal portions 25 of the vibration transmission unit 20 are arranged on both sides of the center line O, the bias of the mass of the vibration transmission unit 20 can be prevented, and the vibration characteristics of the vibration transmission unit 20 can be improved.

1 In-vehicle acoustic device 2 Vibration device 3 Interior material 10 Mass part 11 Magnetic circuit part 12 Magnet 15 Holding member 20 Vibration transmission part 21 Bobbin 21a Surface 22 Transmission support 22a Flange part 22c Surface 23 Coil 23a, 23b Conductor terminal 31 Damper 31a Inner end 31b Outer end

Claims (5)

A mass portion located at the rear, a magnetic circuit portion provided at the mass portion, a vibration transmission portion located at the front, a damper connecting the mass portion and the vibration transmission portion, and a damper rearward from the vibration transmission portion. In an acoustic vibration device including a bobbin extending to the surface and a coil supported by the bobbin and located in a magnetic gap of the magnetic circuit portion.
A terminal portion conducting to the coil is fixed to the vibration transmitting portion, and the terminal portion is provided at a position where it does not overlap with the mass portion in the front-rear direction.
A vibration exciter for acoustics, wherein a wire terminal of the coil extends along a surface of the bobbin and a surface facing the rear of the vibration transmission portion and is connected to the terminal portion. The acoustic vibration device according to claim 1, wherein at least a part of the lead wire terminal is adhered to the surface of the bobbin and the surface of the vibration transmission unit. The damper spreads in a direction intersecting the winding center line of the coil, and the inner peripheral end is fixed to the bobbin and the outer peripheral end is fixed to the mass portion.
The acoustic vibration exciter according to claim 1 or 2, wherein the lead wire terminal passes between the bobbin and the inner peripheral end of the damper. The acoustic vibration exciter according to claim 3, wherein the terminal portions are arranged on both sides of the winding center line. The vibration exciting device according to any one of claims 1 to 4 is provided.
An in-vehicle acoustic device characterized in that the vibration transmitting portion is fixed to an interior material of a vehicle.

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