JPS6216108Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle acoustic device in which an interior panel itself, which is disposed in a vehicle interior and has a sufficient vibration area, is used as a diaphragm.

A conventional speaker as a vehicle audio device is a complete speaker, such as a full range type, 2-way type, or 3-way type, which is buried in a predetermined position such as a front panel, front door, rear side, rear parcel shelf, etc. It was installed as a fixture. Therefore, the size of the speaker unit is naturally limited due to its mounting position, making it difficult to reproduce the bass range well.Furthermore, it is difficult to install a stationary speaker placed on the rear parcel shelf. There were problems such as the large space and obstructing rear visibility.

Focusing on these conventional problems, this idea was developed by attaching an acoustic excitation driver unit to an interior panel that can vibrate a membrane, such as plywood, iron plate, or synthetic resin plate, which is generally arranged inside the vehicle interior. The interior panel itself is used as a diaphragm to improve bass sound reproduction and expand the interior space of the vehicle.In particular, the excitation driver unit is provided with heat dissipation fins for dissipating the heat of the voice coil. In particular, it is an object of the present invention to provide a vehicle acoustic device that is capable of inputting a large amount of power to an excitation driver unit using the panel itself as a diaphragm, and capable of reproducing powerful bass sounds.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

Figures 1 and 2 show an example in which this invention is applied to the rear parcel shelf of an automobile. First, the rear parcel shelf 1 as an interior panel is arranged at the rear of the vehicle interior, and is made of, for example, synthetic resin or plywood. It is formed to a thickness of about 1 to 2 mm, and is fixed to the body panel 3 using screws (not shown) at two ribs on the outer edge, so that the membrane can vibrate.
An acoustic excitation driver unit 4 is directly attached to the rear surface of the central part of the rear parcel shelf 1, and the rear parcel shelf 1 itself vibrates as a diaphragm in response to the acoustic signals input here. It's getting old. On the other hand, at both left and right ends of the rear parcel shelf 1, ordinary general-purpose speaker units 5 and 6 are embedded in a fixed manner in the body panel 3, and corresponding to the speaker units 5 and 6, sound-transmitting speakers are installed. Small holes 7... are bored. The speaker unit 5 reproduces the mid-high range of the L channel of the stereo, and the speaker unit 6 reproduces the mid-high range of the R channel.
In addition, the vibration driver unit 4 reproduces only the bottom range separated from both channels.

Figures 3 and 4 show the configuration of the vibration driver unit 4, in which 8 is a magnet for forming a magnetic field between the pole piece 9 and the yoke plate 10, and 11 is a magnet placed in the magnetic field. The voice coil 12 is a vibration plate on which a bobbin 13 that supports the voice coil 11 is fixed, and the pole piece 9, the yoke plate 10, and the magnet 8 are integrated to form an elastic ring 14. It is elastically supported by a frame 15 through which the frame 15 is fixed to the rear parcel shelf 1 together with the vibration plate 12. That is, when a signal current flows through the voice coil 11, the pole piece 9 etc. and the vibration plate 12 vibrate relative to each other, thereby causing the entire vibration surface of the rear parcel shelf 1 to vibrate. The vibration plate 12 is made of metal or the like with good thermal conductivity, and the frame 1
Heat dissipation fins 16 are radially arranged on the outer peripheral edge protruding from the voice coil 1.
In order to further improve heat transfer from the heat dissipating fins 16 to the heat dissipating fins 16, a thin metal plate 17 is interposed between the vibrating driver unit 4 and the rear parcel shelf 1 when the vibrating driver unit 4 is installed.

Therefore, according to the above embodiment, since the entire surface of the rear parcel shelf 1 vibrates as a vibration surface for reproducing the bass range, a sufficient vibration area can be secured, and a good bass sound that cannot be obtained with conventional vehicle speakers can be obtained. It is possible to reproduce sound, and in terms of space, it does not impair the interior space of the vehicle at all. In addition, if the interior panel itself is used as a diaphragm in this way, it will require a large current, so there is a risk that the voice coil 11 will generate heat, resulting in poor efficiency or disconnection. Since the fins 16 are provided, heat is actively dissipated thereby to prevent excessive temperature rise of the voice coil 11. Therefore, it is possible to input a sufficiently large signal current to the excitation driver unit 4, and it is possible to enjoy powerful bass sounds in the vehicle interior, and the voice coil 1
It is possible to prevent deterioration in efficiency and deterioration in sound quality due to temperature rise.

Next, FIGS. 5 and 6 show another embodiment of the vibration driver unit 4, in which the magnet 8 and the like are arranged in the opposite direction to the above embodiment in a frame 15' whose bottom surface is open. And voice coil 1 on the bottom surface
1, and is directly attached to the rear parcel shelf 1 without intervening a thin metal plate 17 as in the previous embodiment. Then, as shown in FIG.
. . are formed, and similarly to the above embodiment, the heat generated in the voice coil 11 can be rapidly radiated by the fins 16', and an excessive rise in temperature can be prevented.

Above, an example in which this invention is applied to a rear parcel shelf has been described, but this invention is not limited to this, and can be applied to various interior panels, such as instrument panels, molded ceilings, door trims, etc.
It can be applied to interior panels such as door inner panels that are placed inside the vehicle and have a sufficient vibration area, and multiple vibration driver units can be attached to the same interior panel to create a stereo or 2-way system. It is also possible.

As is clear from the above explanation, according to this invention, it is possible to secure a sufficient vibration area, so it is possible to reproduce good bass frequencies, and it also eliminates the need to occupy the interior space of the vehicle at all, which may obstruct rear visibility. There is no. In particular, since the excitation driver unit is provided with heat dissipation fins, it is possible to drive it with a large amount of electric power, and it is possible to obtain sufficiently powerful sound using the interior panel itself as a diaphragm.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a rear parcel shelf to which this invention is applied, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a cross-sectional view showing one embodiment of the excitation driver unit, and Fig. 4
This figure is a bottom view of the same, FIG. 5 is a sectional view showing another embodiment of the vibration driver unit, and FIG. 6 is a bottom view of the same. 1... Rear parcel shelf, 3... Body panel, 4... Excitation driver unit, 8... Magnet, 11... Voice coil, 12... Vibration plate, 16, 16... Heat radiation fin.

Claims (1)

[Scope of utility model registration request] A vehicle that uses the interior panel itself as a diaphragm, characterized in that an acoustic excitation driver unit is attached to an interior panel capable of membrane vibration, such as a rear parcel shelf, and a heat dissipation fin is provided on the excitation driver unit. sound equipment.