JPS63125094A - On-vehicle speaker - Google Patents

Abstract

PURPOSE:To completely reproduce a low pitched tone by constituting two parallel acoustic tubes in the constitution body of a car, providing a driver unit in the inlet of the acoustic tube and disposing the aperture of the acoustic tube in a rear parcel. CONSTITUTION:The musical signals of right and left channels are inputted to the driver units 17, 18 attached to front doors 9, 10. On the rear surface of the driver units 17, 18, the acoustic tubes 19, 20 previously integrally formed on the side surface of frames 15, 16 and a back seat 6 from the front doors 9, 10 are disposed, the apertures 21, 22 are disposed in the rear parcel 5 and the sound of the rear surface of the units 17, 18 is propagated in the acoustic tubes 19, 20 and radiated in the room of the car from the apertures 21, 22. When the length of the acoustic tubes 19, 20 is 1/2 as long as the wavelength of a low threshold frequency, the acoustic tubes resonates with this frequency. A middle and high pitched sound is reproduced in speakers 23, 24 for the middle and high pitched sound mounted in the front doors 9, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vehicle-mounted speaker installed in a vehicle interior.

Conventional technology In recent years, in-vehicle compact disc players and high-output power amplifiers have been commercialized, and the quality of music signals in the car interior has improved significantly, and there is a strong demand for improved performance of the in-vehicle speakers that play these signals. There is something strong. Under these circumstances, a major issue in reproducing sound inside a vehicle is the reproduction of bass frequencies, and conventional technology for expanding bass frequencies includes vehicle-mounted speakers that have a dedicated bass reflex type cabinet placed in the door.

Hereinafter, the above-mentioned conventional vehicle-mounted speaker will be explained with reference to the drawings.

FIG. 7 shows how a conventional vehicle-mounted speaker is installed. In Figure 7, 1 is the car door, 2 is the door 1
Bass reflex type speaker cabinet installed in
3 is a speaker unit attached to the cabinet 2; 4 is a bass reflex port provided in the cabinet 2; its opening is the same as that of the speaker unit 3; the mounting is on the surface.

The operation of the vehicle-mounted speaker configured as described above will be described below.

The music signal amplified by the amplifier is input to a speaker unit 3 attached to a cabinet 2. The cabinet 2 is of a bass reflex type, and the opening of the bass reflex port 4 is the same as the surface on which the speaker unit 3 is attached, and the bass reflex port 4 is expanded by acoustic resonance.

Problems to be Solved by the Invention However, with the above configuration, the volume that can be taken up as a cabinet is limited, the resonance frequency of the bass reflex port 4 becomes high, and the reproduction of bass frequencies is not satisfactory.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides an in-vehicle speaker capable of sufficiently reproducing bass frequencies in response to the recent significant improvement in the quality of music signals.

Means for Solving the Problems To achieve this objective, the in-vehicle speaker of the present invention has the following features:
The structure of the vehicle constitutes two parallel acoustic tubes, a driver unit is provided at the entrance of the acoustic tube, and an opening for the acoustic tube is provided in the rear parcel.

According to the present invention, if a part of the vehicle body forms an acoustic tube in advance, the acoustically necessary length and cross-sectional area are ensured, a driver unit is provided at the entrance of the acoustic tube, and the opening is placed in the rear parcel. , it is possible to significantly increase the acoustic output in the low frequency range due to the resonance and vibration of the acoustic tube.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a vehicle-mounted speaker according to an embodiment of the present invention. In Figure 1, 5 is the rear parcel, 6 is the rear seat, 7 and 8 are the rear doors, 9 and 1o are the front doors, 11.12 is the front / -to, 13.14 is the curl side, and 15.16 (The empty frame, 17.18 is the driver unit, 19.20 is the 111I11 side of the frame 15.16 from the front door 9.10, and the rear seat 6 is configured with two parallel acoustic tubes that are integrally molded in advance, 21.22
Reference numerals 23 and 24 indicate the openings of the acoustic tubes 19 and 20 provided in the rear parcel 5, and the speakers 23 and 24 for medium and high frequency sounds mounted on the front doors 9 and 1o.

The operation of the vehicle-mounted speaker configured as described above will be described below. Music signals for both left and right channels (L+R, or L and R independently) are connected to the front doors 9 and 10.
is input to the driver unit 17, 18 attached to the. On the back of the driver unit 17゜18 there is a front door 9,
Acoustic tubes 19 and 20 which are integrally molded in advance on the sides of the frame 16 and the rear seat 6 are arranged, and the openings 21 and 22 of the acoustic tubes are provided in the rear parcel 6, so that the driver units 1 and 18 are The sound on the back is sound tube 19
The sound propagates through the openings 21 and 20 and is radiated into the vehicle interior through the openings 21 and 22 along with the sound from the front of the driver units 1 and 18. Although the phases of the sounds on the front and rear sides of the driver unit (driver unit) 17 and 18 are reversed, if the length of the acoustic tubes 19 and 20 is set to be 1/2 of the wavelength of the low limit frequency, the acoustic tube 19 and 20 are taken together at this frequency, and the sounds from the front and rear of the driver units 17 and 18 are in phase and added together inside the vehicle. In addition, the middle and high tones are handled by front door 9,
It is reproduced by the medium and high frequency speakers 23 and 24 mounted on the 10.

As described above, according to this embodiment, the driver unit 17
．． Acoustic tube 19.20 is placed on the back of 18,
．． By utilizing the resonance of 20 and the phase inversion effect due to its length, the acoustic output is significantly increased.

FIG. 4 compares the sound pressure spectrum characteristics in the vehicle interior between this embodiment and the conventional one. The sound source is pink noise, and the result is a spectrum analysis performed every 1/3 octave in the band of 20 songs from 20 Hz. Fourth
In the example in which the results shown in the figure were obtained, the driver was a 140-caliber dynamic speaker, and the acoustic tube was a straight tube with a diameter of 10 a and a total length of 3 m. In addition, the conventional example is a bass reflex type with a cabinet volume of 2 liters, the speaker unit is 12c7n diameter, and is mounted on both front doors. From the results in the same figure, in the bass range below 1001-lx, 1
The sound pressure level has been significantly improved to over 5dB.

Further, two acoustic tubes 19 and 20 are arranged in parallel on the back of the two driver units 17 and 18, and the acoustic tubes reproduce low frequency components that can be considered as omnidirectional sound sources.
Mid-high sounds are reproduced by mid-high sound speakers 23 and 24 mounted on the front door 9.1o to create a sense of spaciousness in the sound image.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a structural diagram of a vehicle-mounted speaker according to a second embodiment of the present invention. In FIG. 2, the same components as those in the first embodiment are given the same numbers. In FIG. 2, 2E5 and 26 are driver units, 27 and 28 are acoustic tubes formed by integral molding from the rear door 7.8 to the side of the frame 15.16 and the rear parcel 5, 29.3
0 is the opening of the acoustic tube 27, 28 provided at the rear bar cell. The operation of the structure of the vehicle-mounted speaker configured as described above will be described below.

Music signals for both left and right channels (L+R, or the like).

R independently) is input to a driver unit 25.26 mounted on the rear door 7.8. driver unit) 26
．． On the back of the 26, from the rear door 7.8 to the frame 15.1
On the side of the rear parcel 6, an acoustic tube 27.28 integrally molded in advance is arranged, and its opening 29.30 is provided in the rear parcel 5, so that the driver unit 25.
The sound from the rear side of the driver unit 26 is propagated through the acoustic tube 27, 28, and the sound from the front side of the driver unit 26, 26 is transmitted through the opening 2.
It is radiated into the cabin from 9.30. driver unino) 2
6. The phase of the sound from the front and back of 26 is reversed, but the length of acoustic tube 27.28 is set to 1/2 of the wavelength of the low limit frequency.
If set so that , the acoustic tubes 27 and 28 will resonate at this frequency, and the sounds from the front and rear sides of the driver units 25 and 26 will be in phase and will be added together in the vehicle interior. Mid-high tones are reproduced by mid-to-high tones speakers 23 and 24 mounted on the front doors 9 and 1o.

A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows the structure of a vehicle-mounted speaker according to a third embodiment of the present invention. In FIG. 3, the same components as those in the implementation column of FIG. 1 are given the same numbers. In Figure 3, 31.32 is the driver unit, 33.34 is the side of the frame 15.16 from the curl side 13.14,
An acoustic tube configured in advance by integral molding on the rear parcel 5,
35° 36 is an opening of a sound tube 33° 34 provided in the rear parcel 5.

The operation of the vehicle-mounted speaker configured as described above will be described below. Music signals for both left and right channels (L+R, or R and R independently) are provided by Carlside 13.
14 is input to driver units 31 and 32 attached to the same. On the rear side of the driver unit 31.32, an acoustic tube 33.34 is arranged which is integrally molded in advance from the curl side 13.14 to the side surface of the frame 15.16 and the rear parcel 6, and its opening 36.36 6, the sound from the back of the driver units 31 and 32 propagates through the acoustic tubes 33 and 34, and enters the vehicle interior through the openings 35 and 36 along with the sounds from the front of the driver units 31 and 32. is radiated to.

The phases of the sound on the front and rear sides of the driver units 31 and 32 are reversed, but if the length of the acoustic tubes 33 and 34 is set to be 1/2 of the wavelength of the low limit frequency, at this frequency The sound from the front and back of the driver unit (31 and 32) resonates and is in phase and added together inside the vehicle. In addition, mid-to-high tones are reproduced by mid-to-high tones speakers 23 and 24 mounted on the front doors 9 and 10.

As mentioned above, the second. According to the third embodiment, an acoustic tube 27.2 is provided on the back side of the driver unit 25, 26, 31.32.
8, 33, and 34, and utilizes this resonance and the phase inversion effect due to its length to significantly increase the acoustic output, and its operation is almost the same as the first implementation '1A3. However, since the total length of the acoustic tubes 27.2B and 33.34 is shortened, the low-frequency limit frequency increases, making it somewhat difficult to expand the bass range compared to the first embodiment.
There is no need to extend the 33° 34 to the front doors 9, 1o, and the structure of the vehicle body is simplified.

Although the cross-sectional shape of the acoustic tube is not described in the above embodiment, as shown in FIG.
It may be polygonal or D-irregular, and may have any shape as long as its cross-sectional area is equal to the cross-sectional area required for the acoustic tube.

In addition, in the above embodiment, the acoustic tube was a straight tube with a constant cross-sectional area over the entire length, but if it were to be shaped like a horn, with the cross-sectional area increasing as it approaches the opening of the acoustic tube, the sound tube would propagate through the tube. Impedance matching between the sound and the interior space of the vehicle is improved, and disturbances in the sound pressure custom made are reduced. FIG. 6 shows the structure when the door is opened and closed. A closed-cell polymeric material 30 is fixed around the cut surface of the acoustic tube 29 to prevent sound leakage.

Effects of the Invention The present invention has two sound tubes arranged in parallel when molding a door or frame, which is a structural body of a car, and a driver unit is provided on one side of the sound tube, and an opening is placed in the rear parcel. It is possible to achieve a significant increase in acoustic output due to the resonance of the acoustic tube. In addition, by making the acoustic tube into a horn shape in which the cross-sectional area increases toward the opening, it is possible to increase the acoustic output due to the horn effect.
The acoustic tube is configured in the car body in advance, and the necessary length and cross-sectional area for the acoustic tube are secured, so the bass limit is not limited by the cabinet volume as in the past, and the quality of modern music signals has significantly improved. This makes it possible to realize an on-vehicle speaker that can sufficiently reproduce bass frequencies in response to improved performance.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a vehicle-mounted speaker according to an embodiment of the present invention, FIG. 2 is a structural diagram of a vehicle-mounted speaker according to a second embodiment of the present invention, and FIG. 3 is a structural diagram of a vehicle-mounted speaker according to a second embodiment of the present invention. FIG. 4 is a custom-made diagram of the sound pressure spectrum in the vehicle interior of the present invention and a conventional vehicle-mounted speaker, FIG. 6 is a cross-sectional view of the sound tube of the present invention, FIG. 6, l'i FIG. 7 is a structural diagram of a sound tube when the door is opened and closed, and FIG. 7 is a structural diagram of a conventional vehicle-mounted speaker. 5...Rear parcel, 6...Rear notebook, 7゜8...Rear door, 9.10...
・Front door, 11° 12...Front seat, 13
．． 14... Carl side, 15.16...
...Frame, 17, 18, 25°26.31. 32
・・・・・・Trihaunino), 19°20.27,2
8,33.34・・・Acoustic tube, 21°22.29
．． 30.35.36...Acoustic tube opening, 23
, 24...Speaker for medium and high frequencies, 3o...
- Closed cell polymer material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
Figure □ Hofushi9I -1---YamiiI Otsuβ Number of liquids H2 2q・-Government pipe 3θ-Private bubble polymer material Figure 6

Claims (7)

[Claims] (1) An in-vehicle device characterized in that two acoustic tubes are configured in parallel using the structure of the vehicle, a driver unit is provided at the entrance of the acoustic tube, and an opening of the acoustic tube is provided in the rear parcel. speaker. (2) The vehicle-mounted speaker according to claim 1, characterized in that in the two sound tubes, the driver unit is provided in the front door. (3) The vehicle-mounted speaker according to claim 1, characterized in that in the two sound tubes, the driver unit is provided in the rear door. (4) Claim 1 characterized in that in the two acoustic tubes, the driver unit is provided on the curl side.
Car speakers described in section. (5) The vehicle-mounted speaker according to claim 1, wherein the cross-sectional area of the acoustic tube increases as it approaches the opening. (6) The vehicle-mounted speaker according to claim 1, wherein the sound tube has a constant cross-sectional area. (7) A patent characterized in that, in a sound tube installed in a door, the structure when the door is opened and closed is such that a closed-cell polymeric material is fixed around the cut surface to prevent sound from leaking. An in-vehicle speaker according to claim 1.