JP3479993B2 - Speaker device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device in which an acoustic tube is connected to the back surface of a speaker unit,
Among them, it is most suitable for a vehicle-mounted speaker device in which the indoor space to be installed has many restrictions.

[0002]

2. Description of the Related Art A conventional speaker device of this type will be described with reference to the accompanying drawings.

FIG. 5 is an exploded perspective view showing the structure of a conventional speaker device used for vehicle installation. In the figure, 1 is a speaker unit, 2 is a baffle plate connected to the rear surface of the speaker unit 1, and 3 is a baffle. Mounting holes for mounting the speaker unit 1 provided on the plate 2, 4 are sound emitting holes provided on the baffle plate 2, and 5 is a baffle plate 2 to which the speaker unit 1 is coupled.
The cabinet 6 is formed by connecting the above to form a sound tube, and 6 is a partition plate provided in the cabinet 5 to form a meandering sound path.

In the conventional speaker device having such a structure, when an input is applied to the speaker unit 1, in addition to the reproduced sound emitted from the speaker unit 1 to the front side, the reproduction sound emitted to the rear side of the speaker unit 1 is reproduced. Sound is emitted to the front side from the sound emission hole 4 provided in the baffle plate 2 later through a meandering sound path formed by arranging a plurality of partition plates 6 in the cabinet 5 at different positions. The reproduced sound radiated from the sound output hole causes a resonance phenomenon at a specific frequency determined by the length l of the meandering sound path formed in the cabinet 5, and the resonance phenomenon is utilized to generate the resonance phenomenon. The frequency is adjusted by arbitrarily setting the sound path length l, and the lowest resonance frequency (f ₀ ) of the speaker unit 1 is adjusted.
It was configured to greatly improve the reproduction output in the nearby band.

[0005]

However, in the above-mentioned conventional configuration, the baffle plate 2 is passed from the rear side of the speaker unit 1 through the meandering sound path formed in the cabinet 5.
Although the reproduced sound radiated from the sound emission hole 4 provided in the can improve the reproduction output near the minimum resonance frequency (f ₀ ), the reproduced sound radiated from the speaker unit 1 to the front side has a phase. Since it is reversed, a large dip is generated, a large amount of distortion occurs, and there is a problem that excellent acoustic characteristics cannot be obtained. Further, even if an attempt is made to generate a resonance phenomenon in a lower frequency band to improve the reproduction output, if the length l of the meandering sound path is increased, the speaker device becomes large in size, which is actually impossible. It was one that had both.

FIG. 6 shows the acoustic characteristics of such a conventional speaker device. In FIG. 6, the horizontal axis represents frequency (Hz), the vertical axis represents output sound pressure (dB), and 7 represents reproduced output sound. Pressure frequency characteristic, 7a dip, 8 second order distortion characteristic, 9 3
Secondary distortion characteristic, 10 is impedance characteristic, 10a is acoustic tube resonance, and 10b is cabinet resonance, respectively.

It is an object of the present invention to solve the above conventional problems and provide a speaker device having excellent acoustic characteristics.

[0008]

In order to solve the above-mentioned problems, a speaker device according to the present invention is a cabinet provided with an acoustic tube in which a plurality of partition plates are arranged at different positions to form a meandering sound path. Section and an acoustic tube similarly formed so as to communicate with the acoustic tube formed in this cabinet section, the terminal end of this acoustic tube is opened to the outside,
A baffle part connected to the cabinet part through a shielding plate provided with a hole communicating with each of the acoustic tubes, and a speaker connected to the baffle part so that sound emitted from the back surface is guided by the acoustic tubes. The structure is composed of units, and the acoustic tubes formed in communication with the cabinet part and the baffle part are a pair of independent parts set so that the lengths from the entrance to the opening are different from each other. Is.

[0009]

With this configuration, the reproduced sound radiated from the back surface of the speaker unit passes through the meandering sound path of the acoustic tube formed in the cabinet part and then through the meandering sound path of the acoustic tube formed in the baffle part. Then, the reproduced sound radiated to the front of the speaker unit will be radiated in the same direction from the same place and will be synthesized, and the sound tube will be provided in each of the cabinet part and the baffle part to form a multilayer structure. Thus, a long sound path can be realized with a small speaker device, and the reproduction output can be improved and the reproduction band can be expanded in a lower frequency band.

[0010] Further, by making the above-mentioned acoustic tubes have two configurations and the lengths from the inlet to the opening of each acoustic tube are different, one acoustic tube has a reproduction output in a lower frequency band. By improving the length and expanding the reproduction band, and by setting the length of the other acoustic tube so as to generate the resonance phenomenon according to the frequency at which the dip occurs, the above dip can be eliminated, and it is lower. It is possible to provide a speaker device which has an excellent acoustic characteristic without dipping or distortion while expanding the reproduction band in the frequency band and improving the reproduction output.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the overall construction of the speaker device according to the embodiment, in which a speaker unit 12 is connected and a grill 13 is connected to the front side of the baffle portion 11.
And a cabinet portion 14 connected to the lower portion of the baffle portion 11.

FIG. 2 is an exploded perspective view showing the detailed construction of the speaker device of the present invention shown in FIG. 1, in which the grill 13 is omitted.

3 (a) and 3 (b) are plan views of the baffle portion 11 and the cabinet portion 14 according to the embodiment, respectively.

In FIGS. 2, 3 (a) and 3 (b), reference numeral 11 is a baffle portion, and a mounting hole 15 for mounting the speaker unit 12 is provided at a substantially central portion, and is radiated from the rear surface of the speaker unit 12. The sound emitting holes 16a and 16b through which the reproduced sound is finally emitted to the outside are the mounting holes 1 described above.
5 are provided in close proximity to each other.

Further, as shown in FIG. 3 (a), a plurality of partition plates 17 (broken line portions in the figure) are arranged on the back surface side of the baffle portion 11 so as to shift the positions, whereby the speaker unit 12 An acoustic tube 19 formed with meandering sound paths 18a and 18b so that the reproduced sound radiated from the back side detours.
A pair of a and 19b are provided independently of each other. For reference, in the present embodiment, the respective acoustic tubes 19a and 19b are provided.
The lengths of b were the same.

Reference numeral 20 is a baffle portion 11 and a cabinet portion 1.
4 is a shield plate which is arranged between the two when they are joined together and is joined together, and the hole portions 20a, 19b are formed at positions communicating with the pair of acoustic tubes 19a, 19b formed on the back surface side of the baffle portion 11. 20b, 20c, 20d are provided.

Reference numeral 14 denotes a cabinet portion. Inside the cabinet portion 14, a plurality of partition plates 21 are arranged at different positions like the acoustic tubes 19a and 19b formed on the back side of the baffle portion 11. As a result, the acoustic tube 23 having the meandering sound paths 22a and 22b so that the reproduced sound radiated from the back surface of the speaker unit 12 is detoured.
A pair of a and 23b are provided independently of each other and have different lengths.

The operation of the speaker device of the present invention thus constructed will be described below. First, when an input is applied from the outside to operate the speaker unit 12, the reproduced sound radiated from the speaker unit 12 includes both the reproduced sound radiated to the front side and the reproduced sound radiated to the rear side. The reproduced sound radiated to the front side of both is radiated as it is to the atmosphere (in-vehicle space if it is mounted on a vehicle).

The reproduced sound radiated to the rear side is radiated from the rear side of the speaker unit 12 and then inserted through the holes 20a and 20b provided in the shielding plate 20 shown in FIG. ), The sound paths 22a, 22b of the pair of acoustic tubes 23a, 23b formed in the cabinet section 14 are radiated to the entrance sections 24, 25 shown by the broken line circles, respectively, and the broken paths shown by the sound paths 22a, 22b in the figure. Proceed in the direction of the arrow.

The reproduced sound that has progressed in this way is reproduced in this sound path 2.
2a, 22b end portions of the connection portions 26, 2 indicated by broken line square marks
7, and then the holes 20c and 20d provided in the shielding plate 20 shown in FIG.

In the baffle section 11, as shown in FIG. 3 (a), the reproduced sound that has proceeded from the cabinet section 14 connected to the lower side is the sound of the pair of acoustic tubes 19a and 19b formed in the baffle section 11. After wrapping around to the connecting portions 28 and 29 of the roads 18a and 18b indicated by the broken line square marks, the sound paths 18a and 18b proceed in the directions of broken arrows.

The reproduced sound that has progressed in this way is reproduced in this sound path 1.
Sound emitting holes 16a, 16 to which the end portions of 8a, 18b are connected
The sound emitting holes 16a, 16b
Since 16b is set to a position that is extremely close to the mounting surface of the speaker unit 12 and is extremely close to the mounting surface of the speaker unit 12, the reproduced sound radiated to the front side of the speaker unit 12 and the acoustic tubes 23a and 23b respectively from the rear side are also provided. , 19a, 19
The reproduced sound radiated from the sound output holes 16a and 16b around b is now listened to in a synthesized state. The result of measuring the acoustic characteristics of the speaker device according to this embodiment is shown in FIG.

As is apparent from FIG. 4, the speaker device of the present invention (using the elliptical speaker unit 12 of 20 × 14 cm) has the lowest resonance frequency (f ₀ ) indicated by 30a of the reproduction output sound pressure frequency characteristic 30. The output sound pressure is improved by about 1 dB compared with the conventional product, and the reproduction output is improved and the reproduction band is expanded in a lower frequency band. This effect is achieved through the shield plate 20 with the baffle portion 11 and the cabinet portion 14.
Is a two-layer structure, and the sound paths 18a, 18b, 22a meandering in the baffle portion 11 and the cabinet portion 14, respectively.
Acoustic tubes 19a, 19b, 23a, 23 forming 22b
b, and the respective acoustic tubes 19a and 23a, 19
This is due to the configuration in which b and 23b are connected, and it is possible to set the length l of the acoustic tubes 19a and 23a and 19b and 23b to be long while being small, which is lower than previously impossible. It is possible to improve the reproduction output and expand the reproduction band by generating a resonance phenomenon in the frequency band.

Further, the acoustic tubes 19a, 19b and 23a, 23 provided on the baffle portion 11 and the cabinet portion 14 are provided.
b is configured as two, and these two acoustic tubes 19a and 23a,
By making the lengths of the inlets 19b and 23b from the inlets to the openings different from each other, one acoustic pipe 19b and one acoustic pipe 23b are formed.
b is to expand the reproduction band and improve the reproduction output in the low frequency band, and set the length of the other acoustic tubes 19a and 23a so as to generate the resonance phenomenon according to the frequency at which the dip occurs. As a result, the dip can be eliminated as shown by 30b of the reproduction output sound pressure frequency characteristic 30 in FIG. 4, the reproduction band can be expanded in a lower frequency band, and excellent acoustic characteristics without dip or distortion can be obtained. A speaker device having the same can be provided.

In FIG. 4, the horizontal axis represents frequency (Hz),
The vertical axis represents output sound pressure (dB), 30 represents reproduced output sound pressure frequency characteristics, 31 represents second-order distortion characteristics, 32 represents third-order distortion characteristics, 33 represents impedance characteristics, 33a represents acoustic tube (19b and 23b) resonance, 33b. Indicates acoustic tube (19a and 23a) resonance, and 33c indicates cabinet resonance.

For reference, the acoustic tube 23 is used in this embodiment.
a and 19a, 23b and 19b are two structures, and the length of one acoustic tube (the total of 23a and 19a) is 1.9m, and the length of the other acoustic tube (the total of 23b and 19b). 2.
The configuration is 4 m, and meanders in a state close to reversal in order to realize miniaturization.

The acoustic tubes 23a and 19a, 23b are also provided.
By making the cross-sectional areas of and 19b continuously increase from the entrance to the opening, there is an effect of suppressing the dip generated near the minimum resonance frequency (f ₀ ), and the cross-sectional area at the entrance When 1 is set to 1, the remarkable effect of setting the sectional area of the opening to 1.2 or more can be obtained.

In the present embodiment, the acoustic tube 19 is used.
a, 19b, 23a, 23b has a plurality of partition plates 1
Although the meandering sound paths 18a, 18b, 22a, 22b are formed by arranging 7, 21 at different positions, the present invention is not limited to this, for example, a continuous tubular shape. It goes without saying that the product may be formed by meandering.

Also, the acoustic tubes 23a and 19a, 23b and 1
In order to secure the length 1 of 9b, the shielding plate 20 is used in this embodiment.
Although the baffle portion 11 and the cabinet portion 14 are connected to each other through the two-layer structure, it goes without saying that a three-layer structure or a four-layer structure may be employed.

[0031]

As described above, the speaker device according to the present invention has a sound path composed of a plurality of partition plates or an independent sound path.
An acoustic tube with a sound path composed of tubular products is constructed in multiple layers.
In addition to ensuring a long acoustic tube length despite its small size, the reproduction band is expanded and the reproduction output is improved in a lower frequency band, and the dip that occurs near the lowest resonance frequency (f ₀ ) is eliminated to reduce distortion. It is possible to provide a small-sized and high-performance speaker device capable of exhibiting excellent acoustic characteristics.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a speaker device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing details of the embodiment.

FIG. 3A is a plan view of the baffle portion 11 according to the same embodiment. (B) A plan view of the cabinet unit 14

FIG. 4 is an acoustic characteristic diagram of the speaker device according to the embodiment.

FIG. 5 is an exploded perspective view of a conventional speaker device.

FIG. 6 is an acoustic characteristic diagram of a conventional speaker device.

[Explanation of symbols]

11 Baffle section 12 speaker unit 13 grill 14 Cabinet section 15 mounting holes 16a, 16b Sound output hole 17,21 Partition board 18a, 18b, 22a, 22b sound path 19a, 19b, 23a, 23b Acoustic tube 20 Shield 20a, 20b, 20c, 20d holes 24,25 entrance 26, 27, 28, 29 Connection part 30 Playback output sound pressure frequency characteristics 31 Second-order distortion characteristics 32 Third-order distortion characteristics 33 Impedance characteristics

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 1/28 310 B60R 11/02 H04R 1/02 101

Claims (5)

(57) [Claims] 1. A cabinet part having an acoustic tube having a meandering sound path formed by arranging a plurality of partition plates at different positions, and the acoustic tube formed in the cabinet part is also connected to the acoustic tube. And a baffle portion that is connected to the cabinet portion through a shielding plate provided with a hole portion that communicates with each of the acoustic tubes and that has an acoustic tube formed in A speaker device comprising a speaker unit coupled to the baffle portion so that the radiated sound is guided by the acoustic tube. 2. The loudspeaker according to claim 1, wherein the acoustic tubes formed in communication with the cabinet portion and the baffle portion are a pair of independent acoustic tubes each having a different length from the entrance to the opening. apparatus. 3. The speaker device according to claim 1 or 2, wherein the acoustic tube is configured so that its cross-sectional area continuously increases from the entrance to the opening. 4. A continuous tubular product forming a meandering sound path.
Cabinet with an acoustic tube consisting of
Similarly shaped to communicate with the acoustic tube formed on the net.
With a sound tube made of
A shield plate opened to the outside and provided with a hole communicating with each of the above acoustic tubes
Baffle part connected to the above cabinet part via
And the sound emitted from the back is guided by the above acoustic tube.
From the speaker unit connected to the baffle
Speaker device . 5. As the acoustic tube goes from its entrance to the opening
The cross-sectional area is continuously increased.
The speaker device according to claim 4, wherein