JPH0345874Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an in-vehicle bass speaker system that utilizes a trunk room.

[Conventional technology]

Large-diameter speakers (woofers) are usually required to reproduce bass sounds, but space is limited in the interior of an automobile, and the upper limit of the speaker diameter that can be used is regulated. For example, when the speakers 4 are embedded in the rear tray 3 that partitions the rear seat 1 and the trunk room 2 as shown in Fig. 3, the maximum diameter of the speakers 4 is limited by the area of the rear tray 3 (usually 16 cm -
20cmφ). 5 is the rear window, and 6 is the passenger compartment.

On the other hand, when using a box type speaker whose low frequency is corrected by an amplifier, the box type speaker 7 can be placed on the rear tray 3 as shown in Fig. 4a, or the box type speaker 7 can be placed under the front (or rear) seat 1'. A speaker 7' is often installed. However, the box capacity of the speaker 7' is limited by the limited space under the seat.
Furthermore, items such as the speaker 7 that are installed on the rear tray 3 are not only limited by the area of the rear tray 3, but also have competition for installation location, for example, when an air purifier or the like is installed in the center of the tray.

[Problem that the invention attempts to solve]

As mentioned above, the reality is that in-vehicle bass speaker systems cannot use large-diameter speakers due to space constraints, and therefore cannot reproduce satisfactory low frequencies. The present invention attempts to improve this point by using the trunk room.

[Means for solving problems]

The present invention divides the inside of the trunk space into two spaces by a diaphragm to which a driver unit is attached and which is vibrated by the driver unit, and provides a front chamber in the trunk room, so that the reproduced sound pressure caused by the vibration of the diaphragm is transmitted to the front room. The resonant frequency of the reproduced sound pressure is determined by the length of the duct, the opening area, and the volume of the front chamber. It is characterized by being an adjusting structure.

[Effect]

The bass speaker unit has a driver unit attached to a diaphragm, but since there is sufficient space in the trunk, there is no problem in installing it. Furthermore, since the reproduced sound pressure is introduced into the passenger compartment through a duct installed near the rear seat, the entire area on the rear tray can be used for other purposes. Furthermore, since the duct has a filter effect, it is possible to select and reproduce the desired low frequency range without modifying the existing electrical circuit. This will be explained in detail below with reference to illustrated embodiments.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention, and a
is a side view, and b or c is a front view. In the figure, 1
is the rear seat, 2 is the trunk room, 3 is the rear tray, 5 is the rear window, and 6 is the passenger compartment.
In this example, a diaphragm 10 that divides the interior of the trunk room 2 into two spaces is disposed, and a driver unit 11 that vibrates the diaphragm 10 is attached to the center of the diaphragm 10, thereby controlling the low frequency range generated by the diaphragm 10. The sound pressure (indicated by the arrow) is guided into the passenger compartment 6 through the duct 12. The duct 12 is b
Or, as shown in c, two pieces are each provided at the bottom or side part of the sheet 1.

The resonant frequency of this duct 12 is determined by the length L, the opening area S, and the volume V of the front chamber 25, so the resonant frequency can be adjusted depending on the type of vehicle (for example, the components of the rear seat). It can reproduce optimal bass.

The driver unit 11 is attached to the diaphragm 10 with screws 13 as shown in FIG. 2a. Figure b shows the cross-sectional structure of the driver unit 11, with 14, 15
is the case, 16 and 17 are the cushions, 18 and 19
is a damper, 20 is a pole, 21 is a voice coil,
22 and 23 are plates, and 24 is a magnet. The lower damper 19 has a protruding lower surface, and that surface is attached to the diaphragm 10.

The combination of diaphragm 10 and driver unit 11 can be replaced by a large-diameter bass speaker using paper cone.

[Effect of idea]

As described above, according to the present invention, since the speaker unit is installed in the trunk, a large unit can be used, and low frequencies can be reproduced on a par with home audio. Moreover, since the reproduced sound is introduced into the vehicle interior through a duct running along the bottom or side of the rear seat, space within the vehicle interior, such as above the rear tray, can be effectively used for other purposes. Furthermore, since the duct is used, the filter effect allows the required bass sound to be reproduced without changing the characteristics of the existing electric circuit, and there are advantages such as the ability to always reproduce the optimal bass sound for the lead of the vehicle.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
This figure is a configuration diagram of a driver unit, and FIGS. 3 and 4 are explanatory diagrams of a conventional vehicle-mounted bass speaker system. In the diagram, 1 is the rear seat, 2 is the trunk room,
6 is a vehicle interior, 10 is a diaphragm, 11 is a driver unit, 12 is a duct, and 25 is a front chamber.

Claims (1)

[Scope of utility model registration request] The inside of the trunk room is divided into two spaces by a diaphragm to which a driver unit is attached and which is vibrated by the driver unit. A front room is provided in the trunk room, and the sound pressure reproduced by the vibration of the diaphragm is transmitted from the front room to the rear seat. A structure in which the resonant frequency of the reproduced sound pressure is adjusted by the length of the duct, the opening area, and the volume of the front chamber, by guiding the reproduced sound pressure into the vehicle interior through a duct having a bass enhancement function provided along the lower part or the side. An in-vehicle bass speaker system characterized by: