JPH018067Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vehicle acoustic device that utilizes various vehicle panel members as acoustic diaphragms.

A conventional speaker as a vehicle audio device uses a normal speaker unit equipped with a diaphragm made of paper cone or the like, either as a single full-range type, or as a two-way type by combining multiple speakers.
These completed speakers are buried or installed in predetermined positions such as the front panel, front door, rear side, rear parcel shelf, etc.

However, in order to fully reproduce low frequencies below 200 Hz with a normal speaker unit made of paper cone, etc., a speaker unit with a diameter of nearly 20 cm is required, and a large number of various parts are integrated. In vehicles, the size of the speaker unit that can be mounted is limited due to its mounting position, etc., so with the exception of some large vehicles, it is generally difficult to use large-diameter speakers such as the one described above. be. Furthermore, if such a large-diameter speaker is forcibly placed on the rear parcel shelf, a problem arises in that it obstructs the rear view.

Therefore, in reality, speaker units with a diameter of about 5 to 10 cm are mainly used, and therefore the reproduction of low frequency ranges is insufficient.

Therefore, the applicant has previously developed acoustic vibration drivers for various panel members such as plywood, iron plates, and synthetic resin plates used in various parts of vehicles, such as rear parcel shelves, door trims, door inner panels, and roof panels. We have proposed a vehicle acoustic device in which the panel member itself is used as a diaphragm. According to this, since it is small and does not occupy space in the vehicle interior, and a large vibration area can be obtained, it is possible to reproduce low frequency sounds comparable to a large-diameter speaker.

By the way, the rear parcel shelf used as a diaphragm as mentioned above is generally rigidly fixed at the outer edge, etc., and if it is used as a diaphragm as it is, these various types of Due to the elasticity of the panel member itself, the membrane vibrates using the fixed part as a node. Therefore, the resonant frequencies may overlap within the normal sound range, causing an unpleasant peak in the frequency response, and split vibrations in which each part of the panel vibrates at different phases may occur, causing the actual sound pressure level to vary. low.

In view of these points, this invention separates and forms a non-fixed movable part connected to a part of various panel members of the vehicle via a flexible sheet, and uses this movable part as an acoustic diaphragm. An object of the present invention is to provide a vehicular acoustic device.

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

Figures 1 and 2 show an embodiment in which this invention is applied to a rear parcel shelf of an automobile.As a panel member, the rear parcel shelf 1 is made of, for example, a hardboard as a core material, and a surface layer such as carpet etc. The rib 3 of the car body panel, that is, the rear parcel inner panel 2, which is made by pasting material and has rigidity.
The outer edge portion thereof is fixed via screws 4. In addition, this rear parcel shelf 1 has a rectangular non-fixed movable part 1b separated from the outer fixed part 1a fixed in the above-described manner, and is separated from the movable part 1b. The peripheral fixed part 1a is connected via a frame-shaped flexible sheet 5 made of rubber, soft synthetic resin, cloth, etc., so that the movable part 1b can freely vibrate. Incidentally, in order not to impede this vibration, the flexible sheet 5 is loosened with some allowance as shown in FIG. A vibration driver 6 is attached to the back surface of the movable part 1b, which reproduces an acoustic signal using the movable part 1b itself as a diaphragm. Further, an opening 7 is bored in the rear parcel inner panel 2 in correspondence with the vibration driver 6, and a support frame 8 is fixed to the opening 7 to support the lower end of the vibration driver 6. are doing. As a result, the movable part 1
b is elastically supported by the rear parcel inner panel 2 via a vibrating driver 6.

FIG. 3 shows the configuration of the above-mentioned vibration driver 6, in which reference numeral 9 indicates the pole piece 10 and the yoke plate 11.
a magnet for forming a magnetic field between
is a coil placed in the magnetic field, 13 is an excitation plate to which a bobbin 14 that supports this coil 12 is fixed, and the above-mentioned pole piece 10, yoke plate 11, and magnet 9 are integrated. The pole piece 10 is elastically supported by a case 16 via an elastic ring 15, and this case 16 is fixed to the movable part 1b of the rear parcel shelf 1 together with the vibration plate 13, and the lower surface of the pole piece 10 is attached to the support frame 8. is fixed. That is, the coil 12
When a signal current flows through, the vibration plate 13 supporting the coil 12 vibrates with respect to the pole piece 10 etc. fixed to the support frame 8, and vibrates the movable part 1b of the rear parcel shelf 1. Here, since the movable part 1b is connected to the fixed part 1a via the flexible sheet 5, its vibrations are freely vibrated without being hindered, and thus the reproduced sound can be reproduced in the same way as a normal speaker unit. This is what we get.

Therefore, according to the above embodiment, the interior space of the vehicle is not impaired at all, and the vibration driver 6 attached to the back surface of the rear parcel shelf 1 is also extremely small because it does not include a paper cone or the like. It does not protrude significantly to the sides. In addition, since the area of the movable part 1b of the rear parcel shelf 1 can be set to be sufficiently large as a diaphragm for the vibration driver 6, it is possible to reproduce good bass sounds, comparable to large-diameter speakers that could not be installed in vehicles. You can get the bass. especially,
Since the movable part 1b, which serves as the diaphragm, is formed separately from the fixed part 1a of the rear parcel shelf 1 in a non-fixed state, the entire surface vibrates uniformly, preventing resonance within the normal sound range. As a result, no unpleasant peaks occur in the frequency characteristics. In addition, there is no risk of causing split vibration,
Sufficient sound pressure level can be ensured for cabin acoustics.

Next, FIGS. 4 and 5 show an embodiment in which this invention is applied to the front door of an automobile, in which a door trim 21 whose core material is hardboard or the like is used as the panel member. In the figure, 22 is a door inner panel, 23 is a door outer panel, 24 is a door lock lever, 25 is an armrest, and 26 is a window lift handle. The door trim 21 is attached to the door inner panel 22 by screws, clips, etc. Although the door lock lever 2 is fixed, the door lock lever 2
A non-fixed movable part 21b is formed separately at a position where it does not interfere with the movable part 2.
A frame-shaped flexible sheet 27 is interposed between 1b and the fixed part 21a. The vibration driver 29 having the above-described structure is placed between the support frame 28 fixed to the door inner panel 22 and the movable part 21b.
is attached, and the movable portion 21b is vibrated by the signal current to produce reproduced sound in the same way as a normal speaker unit.

Therefore, in this front door section, various components such as a window lifting mechanism are arranged in a narrow space inside the door, so the size of the usable speaker with a normal speaker unit is severely restricted, and the size of the speaker that can be used with a normal speaker unit is severely limited. Although good reproduction cannot be expected, according to the above configuration, the area of the movable part 21b serving as a diaphragm can be set to be large compared to the space occupied in the door, and it is possible to reproduce the middle and low frequencies well. Further, as in the embodiment described above, since the movable portion 21b is formed separately, no unpleasant resonance or split vibration occurs.

Next, Fig. 6 shows a different embodiment in which this invention is applied to a rear parcel shelf.
The same parts as in the embodiment shown in FIGS. 1 and 2 described above are given the same reference numerals. That is, in this embodiment, an excitation driver 6' having the configuration shown in FIG. An extendable insulator 31 containing a coil spring as an elastic member is interposed between the inner panel 2 and the insulator 31. Under normal conditions, the movable part 1b is positioned approximately on the same plane as the fixed part 1a. The structure is designed to not only force the vibration but also to ensure its free vibration.

The vibration driver 6' is as shown in FIG.
Although it is basically the same as the vibration driver 6 described above, the magnet 9, pole piece 10, and yoke plate 11 are not fixed in particular but are elastically supported by the case 16' via an elastic ring 15.
Therefore, when a signal current flows, the elastically supported pole piece 10 etc. and the excitation plate 13 vibrate relative to each other, and this excitation is applied to the movable part 1b of the rear parcel shelf 1 to which the excitation plate 13 is attached. Power is transmitted,
This causes the movable portion 1b to vibrate.

Therefore, according to the above embodiment, there is no need to make the total height of the vibrating driver 6' match the gap between the rear parcel shelf 1 and the rear parcel inner panel 2 (support frame 8), and the vibrating driver 6' There is no need to limit the dimensions of these parts, and no special consideration is required for their mounting accuracy.

Next, FIG. 8 shows an embodiment in which the mounting position of the insulator 31 is changed between the lower end of the vibrating driver 6 and the support frame 8 having the above structure.

Above, we have described examples in which this invention is applied to rear parcel shelves and door trims, but this invention is not limited to this, and can be applied to various panel members such as door inner panels, roof panels, and head toning. It can also be used in conjunction with a normal speaker unit.

As is clear from the above explanation, according to this invention, a part of the vehicle panel member is used as an acoustic diaphragm, so it can be significantly miniaturized compared to a normal speaker unit, but it does not require a large vibration area. It can be set sufficiently large according to the size of the speaker, and it is possible to reproduce good bass sounds comparable to a large-diameter speaker unit. In addition, as the movable part that becomes the diaphragm is formed separately in a non-fixed state, only a specific frequency does not resonate harshly, and it is possible to prevent a drop in sound pressure level due to split vibration, which improves sound quality and efficiency. This provides sufficient practicality.

[Brief explanation of drawings]

Fig. 1 is a plan view of essential parts showing an embodiment in which this invention is applied to a rear parcel shelf, Fig. 2 is a sectional view taken along the - line, Fig. 3 is a sectional view of the excitation driver, and Fig. 4 is a perspective view showing an embodiment in which this invention is applied to the front door part, and Fig.
6 is a sectional view showing a different embodiment when this invention is applied to a rear parcel shelf; FIG. 7 is a sectional view of the vibration driver in the embodiment shown in FIG. FIG. 8 is a sectional view showing still another embodiment in which this invention is applied to a rear parcel shelf. 1... Rear parcel shelf, 1a... Fixed part, 1b... Movable part, 2... Rear parcel inner panel, 5... Flexible sheet, 6, 6'... Vibration driver, 8... Support Frame, 21...door trim, 21a...fixed part, 21b...movable part, 2
2... Door inner panel, 27... Flexible sheet, 28... Support frame, 29... Vibration driver, 31... Insulator.

Claims (1)

[Scope of utility model registration request] A non-fixed movable part is formed separately on some of the various panel members fixed at appropriate positions on the vehicle body panel, and the fixed part around this movable part is fixed to the vehicle body, and the movable part and the surrounding fixed part are separated. are connected via a flexible sheet, and an acoustic vibration driver is attached to the movable part, and the movable part is elastically supported on the vehicle body panel via the acoustic vibration driver or an elastic member. A vehicle acoustic device characterized in that a portion of the vehicle is used as an acoustic diaphragm.