JPH0724868Y2 - In-vehicle speaker device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Overview The in-vehicle speaker device of the present invention is provided with a pair of left and right box bodies on a rear tray of a vehicle compartment, and a low-frequency speaker whose one surface faces the vehicle compartment is provided in the box body. Each is stored,
This box body communicates with the left and right first and second spaces formed by a pair of partition plates in the trunk room, and forms a third space between the first space and the second space. There are provided a pair of the partition plates, and the partition plates are provided with the first and second ports, and the third space communicates with the vehicle compartment through the third duct provided in the rear tray, and thus the double bass reflex system provides a low-frequency range. Augmentation takes place. The left and right low frequencies are mixed in the third space, but since the low frequency sounds have no directivity, the stereo effect is not adversely affected.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted speaker device that is installed in an automobile and particularly enhances bass.

2. Description of the Related Art In an automobile, since the space inside the vehicle is limited, the woofer, which is a low frequency speaker, cannot be increased in diameter in order to reproduce low frequencies. The volume cannot be increased, and it is difficult to enlarge the structure as a so-called bass reflex system.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention An object of the present invention is to provide a vehicle-mounted speaker device which does not occupy a large space in a vehicle compartment and can enhance a low frequency range.

Means for Solving the Problems The present invention accommodates a pair of left and right low-frequency speakers and a low-frequency speaker, respectively, and one surface of the low-frequency speaker faces a vehicle compartment and is provided on a rear tray of the vehicle compartment. A pair of left and right box bodies whose lower parts communicate with the left and right first and second spaces of the trunk chamber, respectively, and a pair of partition plates that form a third space in the trunk chamber between the first and second spaces, A first duct that is provided on one of the partition plates that partitions the first space and the third space, and that connects the first space and the third space to the other partition plate that partitions the second space and the third space A vehicle-mounted speaker device, comprising: a second duct that is provided to communicate the second space and the third space; and a third duct that is provided to the rear tray and that communicates the third space with the vehicle compartment. is there.

According to the present invention, a pair of left and right box bodies are provided on the rear tray, and a low frequency speaker such as a woofer having a large diameter is housed in the box body, and one surface of the low frequency speaker, For example, the front surface of the speaker cone is exposed to the passenger compartment. A pair of partition plates are provided in the trunk compartment, and thereby a left and right first and second spaces and a third space which is an intermediate thereof are formed. The lower parts of the pair of left and right boxes communicate with the first and second spaces, and the first and second ducts are attached to the respective partition plates. The rear tray has a third space that communicates the third space with the vehicle interior.
A duct is attached. In this way, bass can be enhanced by the so-called double bass reflex system. Particularly, bass sounds in the middle and low frequencies are radiated into the vehicle compartment from the one surface of the low frequency speaker. The other surface of the low-frequency speaker, that is, the surface behind the cone, is the first or second surface from the inside of the box.
It communicates with the third space through the space, and low-pitched bass sounds are radiated into the vehicle compartment through the third duct. In this way, the low range is enhanced.

Embodiment FIG. 1 is a longitudinal sectional view of the embodiment of the present invention as viewed from the vehicle compartment side to the rear, and FIG. 2 is a perspective view of the embodiment shown in FIG. 1 as viewed from the vehicle compartment. FIG. 3 is a section line III of FIG.
FIG. 3 is a cross-sectional view seen from III. Referring to these drawings, a pair of left and right boxes 3 and 4 are fixed on a rear tray 2 in a passenger compartment 1 of an automobile. The box 3 is provided with a high range speaker 5, a middle range speaker 6 and a low range speaker 7. Similarly, the other box 4 is also provided with a high frequency speaker 8, a middle frequency speaker 9 and a low frequency speaker 10. A space 11 for housing the high frequency speaker 5 and the middle frequency speaker 6 and a space 12 for housing the low frequency speaker 7 in the box 3 are separated by a partition plate 13. The other box body 4 is similarly partitioned by the partition plate 14. One surface of the low frequency speakers 7 and 8, that is, the front surface of the cone in this embodiment faces the vehicle compartment 1.

The lower part of the box body 3 has first and second parts on the left and right of the trunk chamber 15.
Through holes 18 and 19 formed in the rear tray 2 in the spaces 16 and 17.
To communicate with each other.

In the trunk chamber 15, a pair of left and right partition plates 21 and 22 is fixed to the vehicle body to form a third space 20 in the middle of the left and right first and second spaces 16 and 17, that is, in the center.
The partition plates 21 and 22 include a first duct 23 and a second duct 24.
And are provided so as to project to the first space and second space 16, 17 sides.

The third duct 25 protruding into the third space 17 is fixed to the rear tray 2 and communicates with the vehicle compartment 1 through a through hole 26 formed in the rear tray 2.

FIG. 4 (1) is a diagram showing a sound passage frequency (resonance frequency) of the first duct 23. Generally, a sealed internal volume V
The resonance frequency when a duct having a cross-sectional area S and a length 1 is provided in a part of the container and communicated with the outside is represented by the following equation.

Where c is the speed of sound.

Here, the pass frequency 01 of the first duct 23 is set to, for example, 80
When designed at Hz, this 80 Hz sound will best pass through the duct 23, but in addition, double and half times 80 Hz harmonics will also pass though this duct 23 will be slightly attenuated. This also applies to the other second duct 24.

FIG. 4 (2) is a graph showing the sound passage frequency of the third duct 25. The passage frequency 02 of the third duct 25 is set to 35 Hz.
When designed to, sound passes according to the characteristics of FIG. 4 (2). In the first and second ducts 23 and 24, sound passes through at 80 Hz and 160 Hz as described above, but 70H
It is difficult to pass at z and 140Hz. Therefore, the sounds of 70 Hz and 140 Hz do not exist in the third space 20, and as a result, the frequency of the sound passing through the third duct 25 is only 35 Hz, and only the sound in the deep low range. Third
It is radiated to the vehicle interior 1 from the through hole 26 through the duct 25. The sound in the deep low range is radiated into the room 1 from the front surfaces of the speakers 7 and 10. The sound in the fixed range in the first and second spaces 16 and 17 is the first
Although it mixes in the third duct 15 through the second ducts 23 and 24, the sound mixed in the third space 15 has a sufficiently low frequency and therefore has no directivity, so that the stereo It does not adversely affect the acoustic effect. In this way, the in-vehicle speaker device capable of enhancing the sound in the deep bass region by the double bass reflex system is realized, and such a configuration is convenient because it does not occupy a large space in the vehicle interior 1.

As described above, according to the present invention, the low-frequency speaker is housed in the pair of left and right boxes provided on the rear tray of the passenger compartment,
The box body communicates with the first and second spaces partitioned by the pair of partition plates in the luggage compartment through the rear tray, and the third space is formed in the middle of the second space.
First and second ducts are provided in each of the partition plates,
A third duct is provided in the rear tray between the third space and the vehicle compartment, so that the trunk area can be used to enhance the low frequency band by the so-called double bass reflex method, and a large space is occupied in the vehicle compartment. There is no.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the embodiment of the present invention seen from the vehicle compartment side to the rear, FIG. 2 is a perspective view of the embodiment shown in FIG. 1 as seen from the vehicle compartment, and FIG. FIG. 4 is a cross-sectional view taken along the section line III-III in the figure, and FIG. 4 is a graph showing the characteristics of the ducts 23-25. 1 ... vehicle compartment, 2 ... rear tray, 3, 4 ... box, 5, 8 ...
High frequency speaker, 6,9 …… Middle frequency speaker, 7,10 …… Low frequency speaker, 15 …… Trunk room, 16 …… First space, 17
…… Second space, 20 …… Third space, 21,22 …… Partition plate, 2
3 …… First duct, 24 …… Second duct, 25 …… Third duct

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right low-frequency speakers and a low-frequency speaker are respectively housed, one side of the low-frequency speaker faces a vehicle compartment, is provided on a rear tray of the vehicle compartment, and a lower portion is a trunk compartment. A pair of left and right box bodies that communicate with the first and second spaces on the left and right, a pair of partition plates that form a third space in the middle of the first and second spaces in the trunk chamber, a first space and a third space A first duct that is provided on one of the partition plates that partitions the first space and the third space, and a second space that is provided on the other partition plate that partitions the second space and the third space. And a third duct communicating with the third space, and a third duct provided on the rear tray for communicating the third space with the vehicle compartment.