JPH02205199A - Speaker system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speaker system suitable for use in particular as a bass speaker for use in a vehicle.

[Summary of the invention]

The present invention provides a speaker system particularly suitable for use in a car-mounted bass speaker, which includes a tubular first acoustic transmission path and a tubular second acoustic transmission path having a different resonance frequency from that of the first acoustic transmission path.
One of the first and second acoustic transmission paths is installed on the sound emission surface side of the speaker unit so as to be orthogonal to the sound emission axis direction of the speaker unit, and the other By attaching the transmission line to the rear side of the speaker unit so that it is parallel to one transmission line, it is possible to avoid using a large diameter speaker unit (,
This allows for bass enhancement.

[Conventional technology]

Space for installing speakers in a car is limited. For this reason, in conventional vehicle-mounted speaker systems, it is not possible to arrange a large-diameter bass speaker unit, and it is not possible to reproduce sufficient bass sounds.

Therefore, there is a need for the development of a vehicle-mounted speaker system that can reproduce sufficient bass sounds even with a relatively small-diameter speaker unit.

As a speaker system capable of reproducing sufficient bass sound with a relatively small-diameter speaker unit, a configuration as shown in FIGS. 14 and 15 can be considered.

FIG. 14 shows a resonance tube 1 mounted on the front of the speaker unit 151.
52 are arranged.

The length of the resonant tube 152 is set depending on the low frequency to be reproduced. Low-frequency components of the sound waves output from the speaker unit 151 resonate with the resonance tube 152 . This makes it possible to increase the sound pressure in the low range.

In FIG. 15, resonance tubes 162 and 163 having different lengths are arranged before and after a speaker unit 161. In this way, by arranging the resonance tubes 162 and 163 with different lengths, there are two resonance points for low-frequency frequencies, so it is possible to widen the range of low-frequency components that can be sufficiently reproduced. .

[Problem to be solved by the invention]

In the configuration shown in FIG. 14, a speaker unit 151 is attached to an end surface of a resonant tube 152 such that the tube axis direction of the resonant tube 152 coincides with the sound emission axis direction of the speaker unit 152. Therefore, when tube resonance occurs, there is a problem in that fluctuations in the pressure inside the tube due to the tube resonance vibrate the diaphragm 153 of the speaker attachment 151, thereby causing distortion.

Similarly, in the configuration shown in FIG. 15, when tube resonance occurs due to the resonance tube 162 or 163, the diaphragm 164 of the speaker 161 receives the vibration, causing distortion.

Therefore, an object of the present invention is to provide a speaker system that can sufficiently reproduce bass sounds even with a speaker unit having a relatively small diameter, and that is not easily affected by fluctuations in pressure inside the pipe during pipe resonance.

[Means to solve the problem]

This invention has a tubular first acoustic transmission path and an acoustic transmission path of the tubular cylinder 2 having a different resonance frequency from the first acoustic transmission path, and among these first and second acoustic transmission paths, One transmission line is attached to the sound output side of the speaker unit so as to be orthogonal to the direction of the sound emission axis of the speaker unit, and the other transmission line is attached to the rear side of the speaker unit so that it is parallel to the other transmission line. This is a speaker system characterized by the fact that it is installed.

[Effect]

Two resonant tubes having different resonance frequencies are arranged in parallel, and a speaker unit is attached to the sides of these resonant tubes. This resonant tube improves low-frequency reproduction characteristics.

Since the speaker unit is attached to the sides of the two resonance tubes, it is not affected by fluctuations in the pressure inside the tubes during resonance.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the invention.

In FIG. 1, the resonant tube 1 has one end IA closed and the other end IB open.

The resonance tube 2 has one end 2A closed and the other end 2B open. The length 11 of the resonant tube 1 is set shorter than the length 12 of the resonant tube 2.The lengths L and 12 of the resonant tube 1 and the resonant tube 2 are, as will be explained in detail later,
It is set according to the low frequency that you want to enhance. Resonance tube 1
The length f is the length of the resonant tube 2! It may be set longer than 2. Also, the length 11 of the resonance tube 1 and the length of the resonance tube 2! 2 may be taken as equal. Furthermore, the resonance tubes 1 and 2 may be cylindrical or prismatic.

A resonant tube 1 and a resonant tube 2 are arranged parallel to each other. A hole 3 for mounting a speaker is formed on the side surfaces IC and 2C to which the resonance tube 1 and the resonance tube 2 are connected. In this speaker mounting hole 3, the side surfaces 1C and 2C of the resonance tube 1 and the resonance tube 2 are communicated with each other. In this speaker installation, a speaker unit 4 is installed in the hole 3.

Like resonant tube l and resonant tube 2, one end IA and 2A
In a resonant tube in which one end is closed and the other ends IB and 2B are open, standing waves are generated as shown by broken lines a1 and bl in FIG.

Therefore, the resonant frequency f1 of the resonant tube 1 is equal to the length of the resonant tube 1 equal to 1! , I, and let C be the speed of sound, then f, = c/4N.

becomes. Moreover, the resonance frequency f2 of the resonance tube 2 is
If the length of is 2□, it becomes f2-C/4fZ.

A component of frequency f of the sound waves output from the speaker unit 4 resonates in the resonant tube 1 . Also, speaker 4
The frequency f2 component of the sound waves output from the resonator tube 2 resonates. Therefore, the frequency characteristics of the speaker system shown in FIG. 1 are as shown in FIG.
and the frequency fz portion is lifted. therefore,
By setting the lengths of the resonant tube 1 and the resonant tube 2 appropriately, the resonant tube 1
By selecting the resonant frequency f1 of the resonant tube 2 and the resonant frequency ft of the resonant tube 2 to be appropriate low-frequency frequencies, sufficient low-frequency reproduction characteristics can be obtained.

Note that since the speaker unit 4 is arranged on the side surfaces IC and 2C of the resonance tube 1 and the resonance tube 2, the diaphragm 5 of the speaker unit 4 is not strongly subjected to pressure inside the tubes during resonance.

FIG. 3 shows a second embodiment of the invention. The first mentioned above
In the embodiment, a resonant tube 1 is used in which one end 1A is closed and the other end IB is open, and a resonant tube 2 is used in which one end 2A is closed and the other end 2B is open. is used. On the other hand, in this embodiment, the resonant tube 11 used has both ends 11A and IIB open, and the resonant tube I2 has both ends 12A and 12B open. The resonant tube 11 and the resonant tube I2 are arranged parallel to each other, and the side surfaces 11 of the resonant tube 11 and the resonant tube 12 are
Speaker units 14 are attached to C and 12C.

Like resonance tubes 11 and 12, both ends 11A and 11B
In a resonant tube in which 12A and 12B are open, as shown by broken lines all and bll in FIG.
There is a standing wave. Therefore, the resonance frequency f of the resonance tube 11
il is the length of the resonant tube 11! 0, and the speed of sound is C, then f ++ = C/ 21 ++. Moreover, the resonant frequency r+z of the resonant tube 12 is f + z= c / 2 j!, assuming that the length of the resonant tube 12 is 11□. It becomes lz. Therefore, in the speaker system configured as shown in FIG. 3, the resonant frequency f11 and the resonant frequency f1
□01□ is lifted.

FIG. 4 shows a third embodiment of the invention.

In this embodiment, the resonant tube 21 has both ends 21A and 21B closed and an opening 26 provided in the side surface 21G, and the resonant tube 22 has both ends 22A and 21B closed.
and 22B are closed, and an opening 27 is provided in the side surface 22C. The resonant tube 21 and the resonant tube 22 are arranged parallel to each other, and the resonant tube 21 and the resonant tube 22 are arranged parallel to each other.
A speaker unit 24 is attached to the side surface of 2.

In this case, standing waves appear as shown by broken lines a21 and b21 in FIG. Therefore, the resonant frequency fz+ of the resonant tube 21 is f++=c/21z+, where the length of the resonant tube 21 is it+ and the speed of sound is C. Moreover, the resonant frequency rzt of the resonant tube 22 is 12! Then, f tz= c / 2 j! It becomes tz. Therefore, in the speaker system configured as shown in FIG. 4, the resonant frequency f□ and the resonant frequency ftT
The l portion is lifted.

In the above example, two resonance tubes 1 and 2.11 and 12.21 and 22 are arranged parallel to each other to set two resonance frequencies.
Alternatively, two resonance frequencies may be set separately.

That is, FIG. 5A and FIG. 5B show one resonant tube 31.
The interior is divided into two spaces 33A and 33B by a separation wall 32, and a speaker unit 34 is attached to a portion of the separation wall 32.

Of the sound waves from the speaker unit 31, the resonance frequency determined by the space 33A and the frequency component determined by the space 33B are lifted, and the low frequency range is enhanced.

Furthermore, in the example shown in FIGS. 1 and 2 to 4, one speaker unit 4.14.24 is arranged for each of the two resonance tubes 1 and 2.11 and 12.21 and 22. However, a plurality of speaker units may be provided for each of the two resonance tubes.

That is, FIG. 6 shows an example in which two speaker units 44A and 44B are arranged for two resonance tubes 41 and 42. In FIG. 7, two speaker units 54A and 54B are arranged in opposite directions to two resonance tubes 51 and 52. of course,
As shown in FIG. 7, when the two speaker units 54A and 55B are arranged in opposite directions, the phase of the sound wave output from the speaker unit 54A and the sound wave output from the speaker unit 54B are It is necessary to establish a relationship such that the phases of

When the above-described speaker system is used, sufficient bass reproduction can be performed even with a relatively small-diameter speaker unit. Therefore, such a speaker system is
It is suitable for use in in-vehicle speakers.

An example in which the present invention is applied to a vehicle-mounted speaker system will be described below.

FIG. 8 shows an example in which the present invention is applied to an on-vehicle speaker system. In FIG. 8, the two resonant tubes 61 and 62 are cylindrical, and the length of the resonant tube 61 and the length of the resonant tube 62 are
The lengths are different from each other. These resonant tubes 61 and 6
As described above, the length of each of 2 is set depending on the low frequency to be enhanced. These resonant tubes 61 and 62
is bent according to the shape of the rear panel 72 of the automobile 71 (FIG. 9).

One end 61A of the resonant tube 61 is closed, and the other end 61B of the resonant tube 61 is open. One end 62A of the resonant tube 62 is closed, and the other end 62B of the resonant tube 62 is open.

The resonance tube 61 and the resonance tube 62 are arranged parallel to each other, and the side surface 61C of the resonance tube 61 and the side surface 62C of the resonance tube 62 are connected. A hole is provided for installing a speaker that communicates between the side surface 61C of the resonance tube 61 and the side surface 62C of the resonance tube 62.
Speaker units 64A and 64B are arranged in opposite directions.

The speaker system 60 configured as described above is the ninth
As shown in the figure, it is placed on a rear panel 72 of an automobile 71. This speaker system 60 enhances the bass range.

That is, as shown in FIG. 9, an audio amplifier 73 is housed in a console box of an automobile 71. Speakers 74A and 74B are attached to the left and right doors. The output of the audio amplifier 73 is supplied to speakers 74A and 74B attached to the left and right doors, and also to speaker units 64A and 64B of the speaker system 60 mounted on the rear panel 72.

Although the speakers 74A and 74B attached to the left and right doors cannot reproduce sufficient bass, the speaker system 60 mounted on the rear panel 72 can provide sufficient bass reinforcement. Therefore, in the car 71, the bass sound is sufficiently enhanced and the user can enjoy powerful music reproduction.

FIG. 10 shows another example in which the present invention is applied to a vehicle-mounted speaker system. In FIG. 10, two resonant tubes 81 and 82 are cut into prismatic shapes, and the lengths of resonant tube 81 and resonant tube 82 are different from each other. One end 81A of the resonant tube 81 is closed, and the other end 81B of the resonant tube 81 is open. One end 82A of the resonance tube 82 is closed, and the resonance tube 82
The other end 82B is open.

The resonance tube 81 and the resonance tube 82 are arranged parallel to each other, and the side surface 81C of the resonance tube 81 and the side surface 82C of the resonance tube 82 are connected. A hole is provided for installing a speaker that communicates between the side surface 81C of the resonance tube 81 and the side surface 82C of the resonance tube 82, and the speaker units 84A and 84 are installed in the hole.
B are arranged in opposite directions.

This speaker system 80, as shown in FIG.
It is placed in a trunk room 92 of a hatchback type automobile 91 in which the trunk room and the interior of the vehicle are continuous. This speaker system 90 enhances bass sounds.

This kind of speaker system is not only used in cars, but also
It can also be used for home audio.

FIGS. 12A and 12B show an example of the present invention applied to a home audio speaker system. 12th
In Figure A and Figure 12B, the left and right side panels l0I
A, l0IB, upper and lower side panels 102A and 102B
, a front panel 103, and a rear panel 104 constitute a box.

A panel 105 is arranged inside the second box.

A speaker unit 109 is attached to the panel 105.

An opening 107 is formed between the lower edge of the front panel 103 and the lower side panel 102B. Furthermore, an opening 108 is formed between the lower edge of the panel 105 and the lower side panel 102B. The size of this opening 107 and the size of the opening 10B are different from each other.

Panel 105, front panel 103, left and right side panels l
A space 106A surrounded by 0IA and 101B acts as a resonant tube.The upper edges of the panel 105, the front panel 103, and the left and right side panels 10IA and 10IB are fixed to the upper side panel 10A, and the bottom of the front panel 103 is Since the opening 107 is formed between the edge and the lower side panel 102B, this resonant tube has one end closed and the other end open. The resonant frequency of this resonant tube varies from the upper edge of the front panel 103 to the front panel 103.
It is set according to the length to the lower edge of.

Similarly, a space 10 surrounded by the panel 105, the back panel 104, and the left and right side panels 101A and 10IB.
6B acts as a resonant tube, this resonant frequency is
It is set according to the length from the upper edge of panel 105 to the lower edge of panel 105.

Low-frequency components of the sound waves output from the speaker unit 109 resonate in the resonance tube formed by the spaces 106A and 106B. This enhances the low frequency level.

FIGS. 13A and 13B show other examples in which the present invention is applied to a home audio speaker system. 1st
In Figure 3A and Figure 13B, the left and right side panels 11
1A, IIIB, front panel 112, back panel 113
, and the lower side panel 114 form a box. The top surface of this box is open. A panel 115 is arranged within this box. A speaker unit 116 is attached to the panel 115.

The panel 115 creates two spaces 118A inside the box.
and 118B. Space 118A surrounded by front panel 112, side panel IIIA, and panel 115
works as a resonant tube (the top surface of the box is open, front panel 112, side panel IIIA, panel 1
Since the lower side panel 112 is fixed to the lower edge of the resonator tube 15, the resonator tube has one end closed and the other end open. The resonant frequency of this resonant tube is determined by the length from the lower edge of the front panel 112 to the upper edge of the front panel 112 (or the length from the lower edge to the upper edge of the side panel IIA, or the length from the lower edge to the upper edge of the panel 115). length).

In addition, the space 118 colors surrounded by the back panel 113, side panel 111B, and panel 115 acts as a resonant tube.
The top surface of the box is open, and the back panel 113
, side panel IIIB, and panel 115. A panel 117 is provided that closes one end of a space 118B surrounded by side panel IIIB and panel 115.

Therefore, this resonant tube has a structure in which one end is closed and the other end is open. The resonant frequency of this resonant tube is from the side of panel 117 to the upper edge of back panel 113 (or from the side of panel 117 to the upper edge of side panel 111B, or from the side of panel 11.7 to the upper edge of panel 115). Set according to length.

Low-frequency components of the sound waves output from the speaker unit 116 resonate in the resonance tube formed by the spaces 118A and 118B. This enhances the low frequency level.

〔Effect of the invention〕

According to this invention, two resonant tubes having different resonance frequencies are arranged in parallel, and a speaker unit is attached to the side surfaces of these resonant tubes. This resonant tube improves low-frequency reproduction characteristics. Therefore, even with a relatively small diameter speaker, a sufficient bass reproduction level can be obtained. Furthermore, since the speaker unit is attached to the sides of the two resonant tubes, it is not affected by fluctuations in the pressure inside the tubes during resonance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the first embodiment of the present invention, FIG. 2 is a frequency characteristic diagram used to explain the first embodiment of the invention, and FIG. 3 is a sectional view of the second embodiment of the invention. 4 is a sectional view of the third embodiment of the invention, FIGS. 5A and 5B are perspective views and sectional views of the fourth embodiment of the invention, and FIG. 6 is a sectional view of the fourth embodiment of the invention.
7 and 7 are perspective views of modified examples of the present invention, FIG. 8 is a perspective view of an example in which the present invention is applied to a vehicle-mounted speaker system, and FIG. 9 is a perspective view of an example in which the present invention is applied to a vehicle-mounted speaker system. FIG. 10 is a plan view used to explain one example, FIG. 10 is a perspective view of another example in which the present invention is applied to a vehicle-mounted speaker system, and FIG. 11 is an explanation of another example in which the present invention is applied to a vehicle-mounted speaker system. FIG. 12A and FIG. 12B are a side view and a cross-sectional view of an example in which the present invention is applied to a home audio speaker system.
3A and 13B are a perspective view and a sectional view of another example in which the present invention is applied to a home audio speaker, and FIG. 14 is a sectional view of an example of a conventional speaker system.
FIG. 15 is a sectional view of another example of a conventional speaker system. Explanation of main symbols in the drawings 1.2.11.12, 21.22.31.41゜42.
51, 52, 61, 62, 81.82: Acoustic tube, 4, 1
4, 24. 34. 44A, 44B. 54A, 54B, 64A, 64B, 84A, 84B, 1
09,116: Speaker unit. Figure 1 Agent: Patent Attorney Masa Tomo Sugiura! Example of li2 Fig. 3 Fig. 2 M1 Fig. 6 et al. 1 Fig. 7 Example Figure 13A Flat [i] [21 Figure 13B

Claims (1)

[Claims] A first tubular acoustic transmission path; and a second tubular acoustic transmission path having a different resonance frequency from that of the first acoustic transmission path.
an acoustic transmission path, one of the first and second acoustic transmission paths is attached to the sound emitting surface side of the speaker unit so as to be orthogonal to the sound emitting axis direction of the speaker unit, A speaker system characterized in that the other transmission path is attached to the rear side of the speaker unit so as to be parallel to one transmission path.