JPS63120584A - On-vehicle speaker - Google Patents

Abstract

PURPOSE:To considerably increase an acoustic output by means of a resonance in a low sound frequency domain in an acoustic tube by preliminarily forming two acoustic tubes different in length with a part of the body of the vehicle, providing a driver unit at the entrance of tube, and disposing its opening at the front door part of the body. CONSTITUTION:In the rear of the driver units 17, 18, the acoustic tubes 19, 20 are disposed integrally with the vehicle-body extending from a trunk room 40, along the side surface of frames 15, 16, to a rear seat 6, and the openings 21, 22 of the tubes 19, 20 are provided at the places of the front doors 9, 10. The lengths of the acoustic tubes 19, 20 are made half the wave lengths of waves in lower limit frequency, so that the tubes 19, 20 resonate at the frequencies. Intermediate and high-frequency sounds are reproduced by speaker units 23, 24 mounted on the front doors 9, 10. As a result, the drastic enhancement of acoustic output is made able by making use of the resonance of the acoustic tubes 19, 20 in low sound frequency domain.

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. 6 shows how a conventional vehicle-mounted speaker is installed. In FIG. 6, 1 is a car number 3, -.

A, 2 is a bass reflex type speaker cabinet attached to door 1, 3 is a speaker unit attached to speaker cabinet 2, 4 is speaker cabinet 2
The opening is the same as the speaker unit 3.The opening is on the same side as the speaker unit 3.

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 speaker cabinet 2. The speaker cabinet 2 is of a bass reflex type, and the opening of the bass reflex boat 4 is the same as the surface on which the speaker unit 3 is attached, and the bass range is expanded by the acoustic resonance of the bass reflex boat 4.

Problems to be Solved by the Invention However, with the above configuration, the volume available for the cabinet is limited, the resonance frequency of the bass reflex boat 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 all the problems In order to achieve this object, the in-vehicle speaker of the present invention has the following features:
Two sound tubes of different lengths are arranged in parallel in the car structure that makes up the vehicle body, and a driver unit is provided at the entrance of the sound tube, and the opening of the sound tube is located in the front door.

Effect of the present invention With this configuration, two parallel acoustic tubes of different lengths are formed in advance in a part of the car body, the acoustically necessary length and cross-sectional area are secured, and the entire driver unit is provided with an opening at the entrance thereof. If it is placed in the front door, it is possible to significantly increase the sound output in the low frequency range due to the resonance of the acoustic tube.

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

FIG. 1 shows an in-vehicle spindle 51-- in one embodiment of the present invention.
7-FIG. 7 shows a configuration diagram of F. In Figure 1, 6 is the rear parcel, 6 is the rear seat, 7 and 8 are the rear doors, and 9
, 10 is the front door, 11.12 is the front seat, 13.1
4 is curl side, 15.16 is frame, 1-r,
1sU driver unit pigeon trunk room, 19.
2o1d) Rank room 40 color frame 15.16
Acoustic tubes 21.22 are acoustic tubes 19.2 of mutually different lengths formed integrally with the rear seat 6 in advance.
0 is an opening, 23, 24 is a speaker unit for medium and high frequencies mounted on the front doors 9 and 10], and 41 is a joint between the acoustic tube frame and the door.

The operation of the vehicle-mounted speaker configured as described above will be described below. Music signals of both left and right channels (L+R) are input to driver units 17 and 18 installed in the trunk room 40. Rear side of the driver unit 17.18 (KU) From the rank room 40 to the side of the frame 15.16, an acoustic tube 19.20 integrally molded in advance on the rear seat 6 is arranged, and its opening 21.22
are installed on the 6 bay/front doors 9 and 10, so the sound from the back of the driver unit (17.18) propagates through the acoustic tubes 19 and 20 and is radiated into the vehicle interior through the openings 21.22. Ru. If the length of the acoustic tube 19.20 is set to be 1/2 of the wavelength of the low limit frequency, the acoustic tube 19.20 will resonate at this frequency. Furthermore, mid-high tones are reproduced by speaker units 23 and 24 mounted on the front door 9 and 10.

As described above, according to this embodiment, the acoustic tubes 19 and 20 of different lengths are arranged on the back of the driver units 1 and 18, and the resonance of the acoustic tubes 19 and 20 is used to reduce the sound pressure level between each other. The aim is to significantly increase the acoustic output by compensating for the low parts. FIG. 2 compares the sound pressure spectrum characteristics in the vehicle interior between this embodiment and the conventional one. The sound source is pink noise, 20Hz to 20KHz t7
) is the result of spectrum analysis performed every 1/3 octave in the band. In the example in which the results shown in Figure 2 were obtained, the driver was a dynamic speaker with a diameter of 14C'IrL, and the acoustic tube was a straight tube with a diameter of 101 and a total length of 3 m.
, .

It was. In addition, the conventional example is a bass reflex type with a cabinet volume of 2 liters, a speaker unit with a diameter of 12 mm, and is mounted on both doors. From the results in the same figure, 100H
The sound pressure level has been significantly improved by 15 dB or more in the bass range below z.

In addition, two acoustic tubes 19.20'i of different lengths are placed in parallel on the back of the two drivers 17.18, and the two acoustic tubes 19.20'i are used to detect low-frequency components that can be considered as omnidirectional sound sources. The medium and high-frequency sounds are reproduced by the medium-high sound speaker units (23 and 24) mounted on the front doors 9 and 1o, giving a sense of spaciousness of the sound image.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 shows a structural diagram of a vehicle-mounted speaker according to a second embodiment of the present invention. In FIG. 3, the same components as those of the first embodiment shown in FIG. 1 are given the same numbers. In Figure 3, 25 and 26 are driver units, 27
．． Reference numeral 28 denotes an acoustic tube formed by integral molding in advance from the rear door 7°8 to the side of the frame 15.16 and the front door 9°10, and 29°30 refers to an acoustic tube 27 provided on the front door 9, 1o.
．． 28 is an opening, and 42 is a joint between the acoustic tube frame and the rear door.

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

Of the music signals (L+R) of both the left and right channels, the electrically divided low frequency components are input to a driver uni-so h25.26 attached to the rear door 7.8. On the back of the driver unit) 25.26, from the rear door 7.8 to the frame 1
5.16, acoustic tubes 27.28 of mutually different lengths are arranged integrally with each other in advance on the front doors 9, 1o, and the openings 29.30 thereof are provided in the front doors 9, 10. , the sound from the back of the driver unit 25.26 propagates through the acoustic tube 27.28, and the sound from the back of the driver unit 25.26
The sound from the front of the vehicle is radiated into the passenger compartment through the opening 29°3o. The phases of the sound on the front and rear sides of the driver units 25 and 26 are reversed, but if the length of the acoustic tubes 2γ and 28 is set to be 1/2 of the wavelength of the low-frequency limit frequency on page 9, the acoustic tube 27
．． 28 resonates at this frequency, and the small driver 25.26
The front and rear sounds are in phase and added together inside the vehicle. Middle and high tones are reproduced by speaker units 23 and 24 mounted on the front doors 9 and 10.

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

FIG. 4 shows the structure of a vehicle-mounted speaker according to a third embodiment of the present invention. In FIG. 4, the same components as those in the embodiment of FIG. 1 are given the same numbers. In FIG. 4, 31.32 is a driver unit, 33134 is an acoustic tube formed integrally with the rear parcel 5, the side of the frame 15.16, and the front door 9110, and 35.
Reference numeral 36 denotes the opening of sound pipes 33 and 34 provided in the front doors 9 and 10.

The operation of the vehicle-mounted speaker configured as described above will be described below. The music signals (L+R) of both the left and right channels are input to driver units 31 and 32 that have 10 vanes attached to the rear parcel 5.

On the back side of the driver unit 31.32, from the rear parcel 5, the sides of the frame 16.16, the front doors 9, 10
Sound tubes 33, 34, which are integrally molded in advance, are arranged, and the openings 35, 36 thereof are provided in the front door 9,10, so that the sound from the back of the driver unit 31132 passes through the acoustic tubes 33, 34. It propagates to the driver unit 31.
The sound is radiated into the vehicle interior from the openings 35 and 36 along with the sound from the front of the vehicle. 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, the sound at this frequency Resonant and also driver 22 SO) 3
The sounds from the front and rear of the 1.32 are in phase and added together inside the vehicle. Further, medium and high-frequency sounds are reproduced by speaker units 23 and 24 mounted on the front doors 9 and 10.

As mentioned above, the second. According to the third embodiment, the driver 2
Acoustic tube 27° 28.33 on the back of 5, 26, 31.32
．． 34'i, and by utilizing this resonance and the phase inversion effect due to its length 11be7, the acoustic output is greatly increased, and its operation is almost the same as the first embodiment. However, since the total length of the sound tubes 27 and 28 is shortened, the low frequency limit frequency increases, making it somewhat difficult to expand the low frequency range compared to the first embodiment. There is no need to extend it to the trunk room 4o, 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. 5, (a) circular, (b)
The shape may be square, (0) polygon, or (d) irregular, and any shape can be used as long as its cross-sectional area is equal to the cross-sectional area required for the acoustic tube.

In each of the above embodiments, the acoustic tube was a straight tube with a constant cross-sectional area over its entire length, but if it were to be shaped like a horn, with the cross-sectional area becoming narrower as it approaches the opening of the acoustic tube, The impedance matching between the sound propagating through the vehicle interior and the interior space of the vehicle is improved, and disturbances in the sound pressure characteristics are reduced.

Effects of the Invention The present invention configures two parallel acoustic tubes of different lengths when molding a door or frame, which is a structure of a car, and
By providing a driver unit at the entrance and arranging the opening at the front door, it is possible to achieve a significant increase in acoustic output in the low frequency range due to the resonance of the acoustic tube. In addition, by creating a horn shape in which the cross-sectional area of the acoustic tube increases toward the opening, it is possible to increase the acoustic output due to the horn effect. Due to the large cross-sectional area, the bass limit is not limited by the cabinet volume as in the past, and is capable of reproducing sufficient bass to accommodate the significant improvement in the quality of recent music signals. All speakers can be realized.

[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 sound pressure spectrum characteristic diagram in a vehicle interior of a vehicle-mounted speaker of the present invention and a conventional vehicle-mounted speaker, and FIG. 3 is a structural diagram of a vehicle-mounted speaker according to an embodiment of the present invention. FIG. 4 is a structural diagram of a vehicle-mounted speaker according to an embodiment of the present invention. FIG. 5 is a cross-sectional view of the sound tube of the present invention, and FIG. 6 is a structural diagram of a conventional vehicle-mounted speaker. 5...Rear parcel, 6...Rear seat, 7゜8...Rear door, 9,1o...
・Front door, 11° 12...Front seat, 13
．． 14... Carl side, 15.16...
・Frame, 17, 18, 25° 26.31.32・
...Driver unit, 19°20, 27.
28. 33. 34・・・Acoustic tube, 21°22
,． 29, 30, 35.36...Acoustic tube opening, 23.24...Speaker for medium and high frequencies, 40...
. . . Trunk room, 41 . . . The joint between the sound tube frame and the front door, 42 . . . The joint between the sound tube frame and the rear door.

Claims (6)

[Claims] (1) The structure of the vehicle comprises at least two parallel acoustic tubes of different lengths, a driver unit is provided at the entrance of the acoustic tube, and an opening of the acoustic tube is provided in the front door. Car speakers. (2) The vehicle-mounted speaker according to claim 1, wherein the driver unit is provided in a trunk room. (3) The vehicle-mounted speaker according to claim 1, wherein the driver unit is provided in a rear door. (4) The vehicle-mounted speaker according to claim 1, wherein the driver unit is provided in a rear parcel. (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.