JPH02190097A - On-vehicle speaker device - Google Patents

Abstract

PURPOSE:To improve the matching of an acoustic impedance by providing an acoustic tube leading sound from a speaker installed in a trunk room to a space in a cabin and expanding gradually the width of the acoustic tube from a seat side toward a rear window. CONSTITUTION:A couple of left and right speakers 2 are installed toward the seat of a trunk room 1 provided to the rear part of a vehicle, and acoustic tube 6 leading the acoustic output from each speaker 2 to the in-cabin space 5 is provided to a rear tray section 4 partitioning the cabin 3 and the trunk room 1. One opening 6a of each acoustic tube 6 connects to the speaker 2 and other opening 6b of each acoustic tube 6 connects to the speakers 2 and each other opening 6b being a communicating opening with the in-cabin space 4 is opposed to the rear window 7. Moreover, each acoustic tube 6 is gradually spread toward the side opening 6b along a lower face of a flat plate 4a being a component of the rear tray 4. Thus, the matching of the acoustic impedance is improved.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a vehicle-mounted speaker device.

BACKGROUND OF THE INVENTION In recent years, with the spread of digital sources such as CD1DAT, there has been an increasing demand for in-vehicle speaker devices that can reproduce deeper bass sounds even in the interior of a vehicle. However, as shown in FIGS. 3 and 4, conventional in-vehicle speaker devices include a speaker 22 for reproducing deep bass in a trunk 21, and the sound output from the speaker 22 is transmitted through an acoustic tube 23. The liquid was discharged from the center of the rear tray 24 into the vehicle interior space 25 through the air.

Problems to be Solved by the Invention However, according to the above-mentioned conventional configuration, the area required on the rear tray for the speaker device is limited to the area required for the speaker device on the rear tray. However, when reproducing deep bass, the area for driving the vehicle interior space 25 is small, and therefore the mismatching of acoustic impedance at the opening of the acoustic tube 23 is large, and stiffness control is used to improve the vehicle interior space 25. The superiority of the sound tube 23 in deep bass region reproduction as a closed small space that can drive the sound tube and realize a uniform sound field has not been fully utilized, and there is also the problem that the acoustic tube 23 becomes a factor that generates new port noise. Ta.

Therefore, an object of the present invention is to provide a vehicle-mounted speaker device that can solve the above problems.

Means for Solving the Problems In order to solve the above problems, the in-vehicle speaker device of the present invention installs a speaker in the trunk of a car, and transmits the sound from the speaker to the rear tray section that partitions the passenger compartment and the trunk. A sound tube is provided that leads to the interior space, and the opening of the sound tube that communicates with the vehicle interior space faces the rear window, and the width of the sound tube is gradually increased from the seat side to the rear window side. It is something.

Effect In the above configuration, the sound output from the speaker is emitted from the communication opening toward the rear window via the acoustic tube and spreads into the interior space of the vehicle. In addition, the communication opening of the sound tube is opposed to the rear window and is enlarged as it goes toward the rear window, so the area that drives the interior space of the vehicle is increased, and the matching of acoustic impedance is improved. It is possible to increase the frequency that transitions to the stiffness control region, which can realize a uniform deep bass sound field in a small closed space such as an indoor space.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2.

■ is a trunk room provided at the rear of the car, and a pair of left and right speakers 2 are installed on the side near the seat. The rear tray section 4 that partitions the vehicle interior 3 and the trunk room 1 is provided with acoustic tubes 6 that guide sound output from each of the speakers 2 to the vehicle interior space 5. One end opening 6a of each sound tube 6 is connected to the speaker 2, and the other end opening 6b, which is an opening communicating with the vehicle interior space 4, faces the rear window 7. . Furthermore, each of these acoustic tubes 6 is gradually enlarged along the lower surface of the flat plate 4a constituting the rear tray section 4 from one end side (seat side) to the other end side, that is, toward the other end side opening 6b. There is.

Therefore, in the above configuration, the sound output from each speaker 2 is emitted from the other end side listening port 6b toward the rear window 7 via the sound tube 6, and then spreads into the vehicle interior space 5.

In this way, since the opening 6b on the other end side of the acoustic tube 6 is enlarged in the width direction of the vehicle, the area for driving the vehicle interior space 5 is increased, and matching of acoustic impedance can be improved. It is possible to increase the frequency at which the frequency transitions to the stiffness control region where a uniform deep bass sound field can be realized in a small closed space such as the vehicle interior space 5. Furthermore, since the rear end portion of the rear tray portion 4 has a small distance from the rear window 7 and is hardly used, no problem arises, and the upper surface of the rear tray portion 4 can be effectively used for other purposes.

Effects of the Invention As described above, according to the configuration of the present invention, the communication opening of the acoustic tube is made to face the rear window and is enlarged toward the rear window, so that the area for driving the interior space of the vehicle increases. , it is possible to improve the matching of acoustic impedance, and therefore it is possible to increase the frequency that transitions to the stiffness side control region where a uniform deep bass sound field can be realized in a small closed space such as a vehicle interior space. Further, since the communication opening of the acoustic tube faces the rear window, the upper surface of the rear tray portion can be effectively used for other purposes.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the in-vehicle speaker device of the present invention, in which FIG. 1 is a partially cutaway schematic plan view, FIG. 2 is a schematic sectional view, and FIGS. 3 and 4. 3 shows a conventional example, and FIG. 3 is a partially cutaway schematic plan view, and FIG. 4 is a schematic sectional view. 1... Trunk room, 2... Speaker, 3...
... Vehicle interior, 4... Rear tray section, 5... Vehicle interior space, 6... Acoustic tube, 6b... Other end side opening, 7... Rear window.

Claims (1)

[Claims] 1. A speaker is installed in the trunk of a car, a sound pipe is provided in a rear tray section that partitions the car interior and the trunk, and an acoustic tube is provided to guide the sound from the speaker to the car interior space, and an opening for communicating with the car interior space is provided in the sound pipe. An on-vehicle speaker device, characterized in that the sound tube faces the rear window, and the width of the sound tube gradually increases from the seat side to the rear window side.