JPH06205497A - Low frequency sound reproduction device for automobile - Google Patents

Abstract

PURPOSE:To attain simple mounting of the device without need of application of hole working for mounting use to a window glass by fixing a vibration generating body to a part of a car body having a stiffness and pressing a vibra tion output section into contact with the window glass. CONSTITUTION:The low frequency sound reproduction device for an automobile is fixed to a rear parcel tray 20 of a car body C, an outer mount case D is tilted to press a vibration output section of a vibration generating body onto a desired position in the inside of a cabin of a rear window glass 14 with an elastic force energized to a support angle 16. In this state, when a low frequency audio signal is fed to the vibration generating body, the vibration generating body generates a mechanical vibration and the vibration is propagated to the rear window glass 14 through the vibration output section. The rear window glass 14 acts like an acoustic diaphragm and a heavy low frequency sound is reproduced in response to the propagated vibration. Since it is not required to make hole processing for mounting the vibration generating body to the window glass 14, the installed location of the vibration generating body is freely changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound reproducing device for an automobile, and more particularly to a low sound reproducing device for an automobile which reproduces a low frequency sound by utilizing a windshield of a vehicle body as an acoustic diaphragm.

[0002]

2. Description of the Related Art The demand for a satisfactory reproduced sound in a vehicle compartment has recently been particularly increased. However, due to space limitations, it is not possible to bring in a large-diameter, large-scale enclosure that is installed in the home for the reproduction of low-frequency sounds, and the reality is that there is a limit to faithful reproduction.

On the other hand, on the other hand, proposals have been made to enhance low frequency sound without using a large-diameter, large-sized enclosure.

As one of the means, a woofer unit of the type that drives a cone diaphragm is not used, but a planar member having a relatively large area among the constituent members of the vehicle body is used as an acoustic diaphragm. , An audio device for enhancing the low frequency sound has been proposed. (See, for example, JP-A-59-4399)

In this proposal, a planar member having a relatively large area such as a door of a vehicle body, a rear parcel tray or a roof top is used as acoustic vibration, and a planar member used as the acoustic diaphragm is used as a vibration generator. It is also used as a fixing member.

Therefore, the vibration generator is attached to the planar member by screwing or by bonding through the lining material and directly fixing it to the planar member. Then, the mechanical vibration from the vibration generator is propagated to the planar member, that is, the acoustic diaphragm through this fixed portion to reproduce the low frequency sound.

In addition to the above proposal, there has been proposed a bass reproduction device for reproducing a low frequency sound by directly attaching a vibration generator to a front windshield or a rear windshield of a vehicle body. (For example, the actual exploitation Sho 62-143383
(See issue)

In this proposal, since the vibration generator is directly attached to the windshield of the vehicle body, a hole for attaching the vibration generator is formed in the windglass in advance, and a mounting screw is passed through the mounting hole and screwed into the vibration generator. , The method of fixing to the windshield by tightening was adopted.

[0009]

In the above-mentioned conventional example, when the vibration generator is fixed to the planar member of the vehicle body, that is, the acoustic diaphragm, the mounting holes are attached to the acoustic diaphragm to which either of them is fixed. It was necessary to carry out processing and the like, and it was not a work content that anyone could easily perform, but it was a big problem in commercializing.

In particular, when the windshield of the vehicle body is used as an acoustic diaphragm, it is not easy to make a hole for attachment to the windshield of the vehicle body, and it is not easy for a general user to provide a hole for attachment to the windshield itself. Had the drawback of being resistant and difficult to implement. Further, when it is necessary to remove the product once attached, there is a problem of backfilling the attachment hole and the like, and there is a drawback that the product cannot be easily handled by general users. Furthermore, there is a drawback in that it is not possible to freely change the installation location because it requires machining of mounting holes.

It is an object of the present invention to provide a novel automobile bass reproduction apparatus that solves the problems of the conventional bass reproduction apparatus.

[0012]

In order to achieve the above object, a low-frequency sound reproducing apparatus for an automobile according to the present invention includes a vibration generator that receives an output signal from a low-frequency amplifier and generates mechanical vibration. Is fixed to a portion having rigidity, and the vibration output portion of the vibration generator is brought into pressure contact with the windshield of the vehicle body.

As one example thereof, the vibration generator is fixed to the rear parcel tray of the vehicle body, and the vibration output portion of the vibration generator is brought into pressure contact with the vehicle interior side of the rear window glass of the vehicle body. .

The bass reproducing apparatus for an automobile according to the present invention is constructed so that the vibration output portion of the vibration generator is brought into pressure contact with the windshield of the vehicle body by using the elastic force of the spring or the elastic member.

Further, a low frequency amplifier may be built in the vibration generator to form an integral structure.

[0016]

By fixing the vibration generator to the rigid portion of the vehicle body, the vibration output portion of the vibration generator is brought into pressure contact with the windshield and the pressure contact state is maintained.

When a bass audio signal is applied to the vibration generator in the above-mentioned pressure contact state, the vibration generator generates mechanical vibration due to a magnetic interference effect which accompanies the applied audio signal.

This mechanical vibration is propagated through the vibration output section to the wind glass used as an acoustic diaphragm.
The wind glass acting as an acoustic diaphragm generates a low-frequency audio reproduction sound in response to the propagated mechanical vibration.

[0019]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a side view showing an example of a state where the bass reproduction apparatus for an automobile of the present invention is fixed to a rear parcel tray of a vehicle body and a vibration output portion of a vibration generator is brought into pressure contact with a rear window glass of the vehicle body. FIG. 2 is a side view showing an example of the low-pitched sound reproducing device for an automobile of the present invention, and FIG. 3 is a plan view thereof. Figure 4
FIG. 3 is a rear view showing a state in which a mounting base portion of the bass reproduction apparatus for automobile shown in FIG. 2 is removed.

FIG. 5 is a cross-sectional plan view showing an example of the vibration generator used in the bass reproduction apparatus for an automobile of the present invention, and FIG. 6 is a perspective view of the vibration generator seen from the back side. FIG. 7 is a perspective view showing a plate damper and a yoke of the vibration generator of FIGS. 5 and 6, and FIG. 8 is a side view showing a damper receiving fitting.

First, the structure of the vibration generator A used in the low-pitched sound reproducing apparatus for an automobile according to the present invention will be described with reference to FIGS. Figure 1 shows the main frame of the vibration generator A, which consists of iron,
It is made of a metal material such as aluminum and has a U-shaped cross section that is long in the lateral direction. As shown in FIGS. 5 and 6, a voice coil 2 is provided at the center of the main frame 1.
Are arranged. The voice coil 2 has a bobbinless structure to improve the efficiency and size of the magnetic circuit.

The insulating substrate 3 of the voice coil 2 is integrally fixed by fitting a part thereof to the inner wall surface of one end of the voice coil 2. This insulating substrate 3 is a coil base plate 4
Is attached to. At this time, the signal input terminal 5 penetratingly implanted in the insulating substrate 3 is inserted from the lower side of the hole 4a formed in the coil base plate 4, and protrudes to the upper surface side of the coil base plate 4. A lead wire for transmitting a low frequency audio signal is soldered to the signal input terminal 5, and is applied to the voice coil 2 through the signal input terminal 5.

The coil base plate 4 is provided with elongated holes 4b for adjusting mounting positions at its four corners, and screws 6 are passed through the elongated holes 4b and fastened to the mounting pieces 7 formed on the main frame 1.

Next, the yoke 9 provided with the magnet 8 will be described. The yoke 9 is formed of a columnar member having a concave cross section, and the magnet 8 is fixed to the inner center of the yoke 9 in a loosely fitted state. Therefore, a magnetic annular space is formed between the outer periphery of the magnet 8 and the inner wall surface of the columnar member having a concave cross section to form a magnetic circuit. The voice coil 2 is arranged in the void. Then, the yoke 9 is attached to the center of the plate damper 10 by a screw 11 so that the voice coil 2 can be always arranged in the correct position in the gap.

The plate damper 10 has a rectangular cross-sectional shape in order to prevent twisting in the non-excited direction, and has a sufficiently thick flat plate-shaped metallic elastic material such as stainless steel, iron, aluminum, and brass. It is formed of a member. The plate damper 10 thus formed is positioned so as to be horizontal with respect to the voice coil 2, and is arranged apart from the inner wall surface of the main frame 1.

Next, an example of the support structure of the plate damper 10 described above will be described. First, the plate damper 10
Is supported by a pair of damper receiving fittings 12 attached to the main frame 1 so as to be swingable in a state where both ends thereof are clamped. This pair of damper brackets 12
Is made of a strong elastic material such as stainless steel or phosphor bronze so as to absorb the expansion and contraction of the plate damper 10 by following the expansion and contraction caused by the swinging of the plate damper 10 in the vibration direction.

The above support structure is composed of the following parts. That is, as shown in FIG. 7, protrusions 10a are formed at both ends of the supported plate damper 10. On the other hand, the damper bracket 12 is formed by bending the support portion 12a into a dogleg shape as shown in FIG. 8, and the square hole 12 is formed in the bent portion of the support portion 12a.
b is provided. In addition, the main frame 1 at the bottom
Screw hole 12 for attaching to the metal fitting attaching portion 1a provided in
c is provided.

Therefore, the plate damper 10 is separated from the inner wall surface of the main frame 1 and the voice coil 2 is provided.
In the case of mounting so as to be horizontal with respect to the main frame, the projections 10a formed on both ends of the plate damper 10 are inserted into the holes 12b of the pair of damper receiving fittings 12, respectively, and the main frame is inserted from both sides. It is attached and supported by screwing to 1. Further, the damper receiving metal fitting 12 prevents the protrusion 10a from swinging in the non-exciting direction by virtue of the vertical inner wall portions of the hole 12b, that is, the plate damper 10 is prevented from swinging in the non-exciting direction. is doing.

Further, the metal fitting mounting portion 1a of the main frame 1
An elastic member 13 made of rubber, foamed resin, or the like is attached to each of the caps in a cap shape, and constitutes a vibration output portion B for bringing the rear window glass 14 of a vehicle body C, which will be described later, into pressure contact with the vehicle interior side.

In the vibration generator A having the support structure thus constructed, when a low frequency audio signal of, for example, 150 Hz or less is applied to the voice coil 2, a magnetic force is applied to the voice coil 2 based on the applied audio signal. Occur. Due to the magnetic interference between the magnetic force of the voice coil 2 and the magnetic force of the magnetic pole 8, the yoke 9 supported by the plate damper 10 and the voice coil 2 attached to the main frame 1 are relatively displaced and mechanically moved. Generates vibration. This mechanical vibration is propagated to the entire main frame 1, and the vibration can be output from the vibration output section B located in the vibration direction of the main frame 1.

At this time, since the plate damper 10 is swingably supported by the pair of damper receiving metal fittings 12 in a state where both ends thereof are clamped, the vibration direction of both ends of the plate damper 10 is considered. It is possible to absorb the expansion and contraction by following the expansion and contraction motion caused by the rocking to.

As shown in FIGS. 1 to 4, the vibration generator A constructed as described above is built in and fixed to the outer case D with the vibration output portion B thereof being projected to the outside.

The outer case D is supported so that both sides thereof are sandwiched by the substantially U-shaped support fittings 15, and the supporting portion is pivotally supported so as to be swingable. By supporting the exterior case D with the support fittings 15 so as to be swingable,
The contact state of the vibration generator B with the rear window glass 14 can be adjusted.

The support fitting 15 is a tubular support angle 16
It is attached to the upper end of so as to be rotatable within a predetermined range. By rotating the exterior case D, that is, the vibration generator A slightly to the left or right by the rotating mounting portion 17, the contact state between the vibration output portion B and the rear window glass 14 can be adjusted. I am trying.

On the other hand, the support angle 16 is rotatably supported at its lower end by a mount 18 and has a strong elastic force for pressing the vibration output portion B of the vibration generator D to the rear window glass. The force is constantly energized. Therefore, by rotating the support angle 16 with the lower end portion as a fulcrum, the entire outer case D including the vibration generator A is tilted as shown in FIGS. 1 and 2, and the rear window glass 14 is tilted. It is configured so that it can be adjusted to the angle, that is, the elevation angle can be adjusted.

As a means for urging the elastic force to the support angle 16, as shown in FIG. 4, in this embodiment, a coil spring 19 is used for urging. In addition to this, a leaf spring or a resin spring member or the like should be used to constantly urge the support angle 16 in the standing direction, that is, in the direction in which the vibration output portion B of the vibration generator A comes into pressure contact with the rear window glass 14. Any structure may be used as long as it can achieve the above.

Further, the mount 18 is a vibration generator A.
In addition to supporting the above, a low frequency amplifier for driving the vibration generator A and a reception / control circuit for remote control for varying the amplification level and the like are incorporated therein. The mount 18 is fixed to the rear parcel tray 20 of the vehicle body C. As a fixing means to the rear parcel tray 20, a velcro tape, a double-sided adhesive tape, or the like is attached to the back surface of the mounting base 18 for fixing, or is fixed by screwing.

Reference numeral 21 is a signal code for supplying the low-frequency audio signal output from the low-frequency amplifier built in the mount 18 to the vibration generator A. The signal code 21 passes through the inside of the support angle 16 and the upper end of the support angle 16. One end is exposed at the portion, enters the outer case D, and is connected to the signal input terminal 5 of the vibration generator A. The exposed portion of the signal cord 21 is a play cord portion adapted to correspond to the movement of the outer case D.

Therefore, as shown in FIG. 1, the automobile bass reproducing apparatus of the present invention is fixed to the rear parcel tray 20 of the vehicle body C, and the outer case D is tilted so that the vibration output portion B of the vibration generator A is rear. The window glass 14 is applied to a desired position on the inside of the vehicle compartment, and is brought into pressure contact with the elastic force of the support angle 16. In this state, when the low frequency audio signal is supplied to the vibration generator A, the vibration generator A generates mechanical vibration, and this vibration is propagated to the rear window glass 14 through the vibration output section B. The rear window glass 14 acts as an acoustic diaphragm and reproduces a deep bass sound according to the transmitted vibration.

[0040]

As described above, according to the bass reproducing apparatus for an automobile of the present invention, the vibration generator is fixed to the rigid portion of the vehicle body and the vibration output portion is brought into pressure contact with the windshield. Since the mechanical vibration can be propagated to the window glass, the window glass used as the acoustic diaphragm does not need to be provided with holes for attachment, and can be easily attached.

Further, since it is not necessary to make a hole for attaching the vibration generator to the wind glass, the installation location of the vibration generator can be freely changed, and furthermore, the removal when not in use is extremely easy.

[Brief description of drawings]

FIG. 1 is a side view showing a mounted state of a low-pitched sound reproducing device for an automobile of the present invention.

FIG. 2 is a side view of the low-pitched sound reproducing device for an automobile of the present invention.

FIG. 3 is a plan view of the device shown in FIG.

FIG. 4 is a rear view showing a state in which a mount portion is removed from the device shown in FIG.

FIG. 5 is a cross-sectional plan view of a vibration generator.

FIG. 6 is a partially cutaway perspective view of the vibration generator shown in FIG. 5 as viewed from the back side.

FIG. 7 is a perspective view showing a plate damper and a yoke of the vibration generator.

FIG. 8 is a side view showing a damper bracket of the vibration generator.

[Explanation of symbols]

A is a vibration generator. B is a vibration output unit. C
Is the car body. D is an outer case. 1 is a mainframe. 2 is a voice coil. 3 is
It is an insulating substrate. 4 is a coil base plate. 5 is
This is a signal input terminal. 6 is a screw. 7 is a mounting piece. 8 is a magnet. 9 is a yoke. 10
Is a plate damper. 11 is a screw. 12
Is a damper bracket. Reference numeral 13 is an elastic member. 1
4 is a rear wind glass. Reference numeral 15 is a support fitting. Reference numeral 16 is a support angle. Reference numeral 17 is a mounting portion. 18 is a mounting base. 19 is a coil spring. 20 is a rear parcel tray. 21 is a signal code.

Claims (4)

[Claims] 1. A vibration generator, which receives an output signal from a low-frequency amplifier and generates mechanical vibration, is fixed to a rigid portion of a vehicle body, and a vibration output portion of the vibration generator is attached to a windshield of the vehicle body. A low-pitched sound reproducing device for an automobile, which is configured to be in pressure contact. 2. A vibration generator is fixed to a rear parcel tray of a vehicle body, and a vibration output portion of the vibration generator is brought into pressure contact with a vehicle interior side of a rear window glass of the vehicle body. Item 1. A low-pitched sound reproducing device for an automobile according to item 1. 3. The bass reproducing apparatus for an automobile according to claim 1, wherein the vibration output portion of the vibration generator is brought into pressure contact with the windshield of the vehicle body by using the elastic force of a spring or an elastic member. . 4. The low-pitched sound reproducing apparatus for an automobile according to claim 1, wherein a low-frequency amplifier is built in the vibration generator.