JP3416764B2 - Vibration generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator which is mounted on a floor surface of a vehicle or the like to be vibrated to reproduce a low frequency range.

[0002]

2. Description of the Related Art Conventionally, a subwoofer housed in a large cabinet is installed in the trunk of a car when it is desired to produce a deep bass sound in a vehicle-mounted speaker. If you can not install a large cabinet, such as when you do not want to sacrifice space, install a vibration generator on the floor of the car to vibrate the floor and use the cabin as a cabinet to reproduce the low range. I have to.

FIG. 6 shows an example of a conventional vibration generator,
It is a magnet drive type, so to speak, in the figure 3
Reference numeral 1 is a cylindrical frame in which coils 32 are vertically arranged on the inner peripheral side, and 35 is a vibrating system constituted by sandwiching a magnet 33 between upper and lower plates 34, which closes the upper and lower openings of the frame 31. The suspensions 36a, 36b, which are the vibrating members arranged in this way, are fixed by mounting screws 38a, 38b via spacers 37a, 37b.

[0004]

However, since the size of the vehicle compartment differs depending on the vehicle type, its resonance frequency is different. Therefore, conventionally, a plurality of types of vibration generators having different resonance frequencies having different strengths of the suspensions 36a and 36b and the weight of the vibration system 35 are made to correspond to different vehicle types as described above according to the vehicle type. Although a plurality of vibration generators are combined, this has the drawback of increasing costs.

An object of the present invention is to solve the above-mentioned drawbacks of the conventional vibration generator and to provide a vibration generator capable of arbitrarily changing the resonance frequency from the outside of the case.

[0006]

According to a first aspect of the present invention, there is provided a vibration generator using a vibration unit having a magnet and a coil which are driven relative to each other. The vibrating member coupled to the system is shaped like a butterfly damper, and the entire vibrating unit is housed in a case having a top plate and a bottom plate. Adjusting the stiffness of the damper by projecting a supporting part provided on the container into the case, supporting a part of the butterfly damper by the supporting part, and rotating the adjuster to change the supporting fulcrum of the butterfly damper. It is characterized in that it is configured to.

Thus, the stiffness of the damper is changed by rotating the adjuster from outside the case to variably adjust the support fulcrum of the butterfly damper, which is a vibrating member, and the resonance frequency can be adjusted arbitrarily. According to a second aspect of the present invention, the vibration unit is of the same coil drive type as a general speaker unit including a magnetic circuit and a drive coil arranged in a gap of the magnetic circuit. .

Thus, the vibration unit itself can be manufactured by using the conventional speaker unit assembly line.

According to a third aspect of the present invention, there is provided a magnet drive type vibrating unit comprising a cylindrical frame having coils vertically arranged on an inner peripheral side thereof and a magnet arranged inside the frame. Characterize.

Thus, the conventional vibration generator can be modified and manufactured.

[0011]

1 is a sectional view showing an embodiment of a vibration generator, FIG. 2 is a plan view of a butterfly damper, FIG. 3 is a plan view showing a top plate of a case and an adjuster, and FIG. FIG. 6 is an enlarged plan view of a main part showing a change in a supporting fulcrum for a butterfly damper. In the figure, 10 is a vibration unit, which is of a coil drive type, and a vibration system 1 is composed of a magnetic circuit 2 and a drive coil 3 arranged in a gap G of the magnetic circuit 2.
This vibration system 1 includes a coil bobbin 3 a of the drive coil 3.
Are coupled to the vibration member 5.

The magnetic circuit 2 includes a yoke 2a and a magnet 2
b and the top plate 2c, and the drive coil 3, the coil bobbin 3a, and the damper 4 are similar to those of a general speaker unit. The vibrating member 5 is formed of glass fiber reinforced plastic or the like in the shape of the butterfly damper 6. The damper 4 can also be made of glass fiber reinforced plastic or the like.

As shown in FIG. 2, the butterfly damper 6 has arcuate outer peripheral side slits 7a and inner peripheral side slits 7a.
b is communicated, and such slits are arranged at a plurality of locations (four locations in the embodiment) while shifting the position, and the adjacent outer peripheral slit 7a is inside the inner peripheral slit 7b. , And the connecting support piece 8 is provided therebetween. The vibration system 1 is connected to the butterfly damper 6, and a ring-shaped weight 9 is attached to the upper surface of the butterfly damper 6 as an additional weight.

Reference numeral 11 denotes a case for accommodating the entire vibrating unit 10, which is composed of a cylindrical main body 12, a top plate 13 and a bottom plate 14, and the top plate 13 has a structure as shown in FIG. Arc-shaped slits 15 are formed at four locations. On the top plate 13, an adjuster 16 having a knob portion 17 and four downwardly extending supporting portions 18 is rotatably arranged, and the supporting portion 18 extends from the arc-shaped slit 15 to the inside of the case. An engaging groove 18a is formed on the outer surface of the tip end of the protruding portion, and the engaging groove 18a is engaged with the connecting support piece 8 of the butterfly damper 6.

Therefore, when the knob portion 17 of the adjuster 16 is rotated, the support portion 18 rotates along the arcuate slit 15 and the support fulcrum for the butterfly damper 6 changes as shown in FIG. Since the stiffness can be changed, the resonance frequency can be adjusted arbitrarily.

[0016]

FIG. 5 shows another example of the structure applied to a magnet-driven type vibration generator. Like the conventional structure described with reference to FIG. 6, a coil 22 is provided on the inner peripheral side of a cylindrical frame 21. Are arranged above and below, and a vibration system 25 constituted by sandwiching a magnet 23 between upper and lower plates 24 is arranged inside the frame 21.

Like the conventional one, the vibrating members 26a and 26b are arranged so as to close the upper and lower openings of the frame 21, and the vibrating members are formed into the shape of the butterfly damper 6 as shown in FIGS. The butterfly damper 6 is formed with a spacer 37
The vibration system 25 is attached to the mounting screw 28a,
Secure with 28b.

The vibration unit 1 constructed in this way
0 is housed in the case 11 similarly to that shown in FIG. 1, the adjuster 16 is arranged on the top plate 13, and the other configurations are the same as those in FIG.

[0019]

According to the vibration generator of the present invention, the resonance frequency can be arbitrarily changed from the outside of the case in correspondence with different vehicle types and the like. It does not need to be prepared and can be implemented at low cost.

In the case of the coil driving type embodiment as shown in FIG. 1, since the vibration system has the same structure as a general speaker unit, a speaker unit manufacturing apparatus and a manufacturing line can be used, which is inexpensive. Can be manufactured.

In the case of the magnet driving type embodiment as shown in FIG. 5, it can be carried out only by improving the conventional magnet driving type vibration generator.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a vibration generator according to the present invention.

FIG. 2 is a plan view of a butterfly damper.

FIG. 3 is a plan view showing a top plate of a case and an adjuster.

FIG. 4 is an enlarged plan view of a main part showing a change in a supporting fulcrum for a butterfly damper.

FIG. 5 is a cross-sectional view showing another configuration example.

FIG. 6 is a cross-sectional view showing a conventional vibration generator.

[Explanation of symbols]

1 Vibration system 2 magnetic circuit 3 drive coil 4 coil bobbin 5 Vibration member 6 butterfly damper 7a Outer side slit 7b Inner circumference slit 8 Connection support piece 9 weights 10 Vibration unit 11 cases 13 Top plate 15 arc slit 16 Adjuster 17 knob 18 Support 18a engagement groove 21 frames 22 coils 23 Magnet 24 plates 25 vibration system 26a suspension 26b suspension 27a spacer 27b spacer 28a Mounting screw 28b Mounting screw

Claims (3)

(57) [Claims] 1. A vibration generator using a vibrating unit including a magnet and a coil that are driven relative to each other, wherein a vibrating member coupled to a vibrating system of the vibrating unit is shaped like a butterfly damper, and the entire vibrating unit is It is housed in a case provided with a top plate and a bottom plate, an adjuster is rotatably arranged outside the case, and a support portion provided on the adjuster is projected into the case so that the butterfly damper is supported by the support portion. A vibration generator, characterized in that the stiffness of the damper is variably adjusted by supporting a part thereof and rotating the adjuster to change the support fulcrum of the butterfly damper. 2. The vibration generator according to claim 1, wherein the vibration unit is a coil drive type drive unit having a magnetic circuit and a drive coil arranged in a gap of the magnetic circuit. 3. The vibrating unit is a magnet drive type vibrating unit including a cylindrical frame having coils arranged vertically on the inner peripheral side thereof and a magnet arranged inside the frame. The vibration generator according to Item 1.