JPH1141686A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sound quality of the small-sized lightweight speaker. SOLUTION: A speaker unit 24 is fitted to a baffle plate 22 at a front side of a speaker box 21 and a baseless duct 26 for low-frequency sound radiation and so that the front side speaker unit 24 is opposite and back-to-back, the speaker unit 25 is fitted to the rear side baffle plate 23 to connect rear sides of a magnetic circuit of both the speaker units 24, 25 and a baffle-reflecting duct 27 for low-frequency sound radiation is provided in communication with the baffle-reflecting duct 26 of the front side so as to cancel or reduce the reaction of both the speaker units 24, 25 or both the babble-reflecting ducts 26, 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device suitable for being applied to a small and lightweight speaker device.

[0002]

2. Description of the Related Art Conventionally, a small and lightweight speaker device as shown in FIG. 3 has been proposed. In FIG. 3, reference numeral 1 denotes a small and lightweight speaker box made of a synthetic resin or the like, and a speaker unit 3 is fixed to a speaker mounting hole 2a formed on the upper side of a baffle plate 2 fixed to the front of the speaker box 1.

The speaker unit 3 is configured, for example, as follows. As shown in FIG. 3, a ring-shaped magnet 4, a plate 5 and a yoke 6 attached so as to sandwich the ring-shaped magnet 4 are provided, and between the inner peripheral side of the plate 5 and a center pole 6 a of the yoke 6. The magnetic gap 7 is formed. Also this plate 5
The frame 8 of the speaker is attached to the frame 8. An edge 9 is provided on the outer periphery of the frame 8, and the outer periphery of the cone-shaped diaphragm 10 is held by the edge 9.

On the other hand, a voice coil bobbin 11 is mounted on the inner peripheral portion of the diaphragm 10, and a voice coil 12 is wound around the voice coil bobbin 11.
a so as to be inserted into the magnetic gap 7 formed by a. Reference numeral 17 denotes a damper for holding the voice coil 12 in the magnetic gap 7.

An audio signal from an input terminal 13 provided at a predetermined position outside the speaker box 1 is transmitted to a connection line 14.
To the terminal 15 of the speaker unit 3, and the audio signal from the terminal 15 is supplied to the voice coil 12 via the tinsel wire 16.

A duct 18 having an opening 18a is provided on the same surface of the baffle plate 2 as the speaker mounting hole 2a.
The phase of the sound emitted from the back of the diaphragm 10 of the speaker unit 3 is inverted, and the speaker box 1
To radiate out of the vibrating plate 10 so as to widen the bass range of the sound coming out of the front surface of the diaphragm 10.

[0007]

The speaker device as shown in FIG. 3 is characterized in that it is small and lightweight. However, if the diaphragm 10 of the speaker unit 3 vibrates to emit sound, the force F of the vibration is applied to the speaker unit 3.
(F = mα) of the effective mass m of the vibration system and the moving acceleration α of the vibration system.

In general, when an object moves, there is an action and a reaction. In the case of this speaker device, the speaker box 1 receives the reaction force. In this small and lightweight speaker device, the weight of the speaker box 1 is reduced. Because of its small size, the reaction force cannot be supported by the speaker box 1.

For this reason, in such a conventional small and lightweight speaker device, when the diaphragm 10 of the speaker unit 3 vibrates due to sound emission, the speaker box 1 generates the vibration force F of the vibration system of the speaker unit 3. It was not heavy enough to support, and the power of sound emission was weakened, degrading sound quality.

Further, in the duct 18, a reaction force when sound is radiated is given to the speaker box 1,
Since the speaker box 1 is lightweight, the power of radiating the sound is weakened, and there is a disadvantage that the sound quality of the bass is deteriorated.

In view of the foregoing, it is an object of the present invention to prevent the power of sound radiation from being weakened by the above-mentioned action and reaction force and to improve sound quality.

[0012]

In order to achieve the above-mentioned object, the present invention provides a speaker device in which a sound emitting speaker unit is mounted on a baffle plate on one surface of a speaker box and a bass sound emitting baffle duct is provided. At
Another speaker unit for sound emission that generates a reaction force substantially equal to the reaction force of the speaker unit is mounted on another surface of the speaker box, and a reaction force substantially equal to the reaction force of the baffle duct is generated. Another baffle duct for low-frequency radiation is provided.

In the speaker device according to the present invention having the above-described structure, the mutual reaction force of the two speaker units and the mutual reaction force of the two baffle ducts are canceled or reduced by the speaker units and the baffle ducts. We prevent vibration of speaker box,
The radiating power of the sound of the speaker device can be reduced, and the bass can be enhanced by the radiating power of both baffle ducts, so that the sound quality of the small and lightweight speaker device can be improved.

[0014]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG.

In this embodiment, the speaker device according to the present invention is configured so that the bass range of the speaker can be enhanced.

FIG. 1 shows an example of a speaker device. This speaker device 20 is provided with baffle plates 22 and 23 on the front and rear surfaces of a speaker box 21, and a speaker unit is provided on each of the baffle plates 22 and 23. 24,
25, and baffle ducts 26 and 27 are provided.

The speaker units 24 and 25 have the same diameter and the same output, and are attached to speaker attachment holes 22a and 23a formed opposite to the baffle plates 22 and 23 on the front and rear surfaces by joining the back sides to each other. Have been. That is, the two speaker units 24 and 25 have a magnetic shield configuration in which the yokes of the magnetic circuit are joined to each other on the back surface.

The speaker units 24 and 25 have the same configuration as described below. That is, a center pole portion 31a is provided at the center, and the center pole portion 31a
The magnet 32, which is magnetized in the thickness direction in a ring shape on a disk-shaped yoke 31 in which a magnet guide surface 31b is formed in a protruding shape surrounding the base of The inner peripheral surface 32a is fixed so as to be substantially concentric with the center pole portion 31a by engaging with the magnet guide surface 31b. Hole 3
A disk-shaped plate 33 having 3a is fixed, and a magnetic gap g of a magnetic circuit is formed between the center hole 33a and the center pole portion 31a.

The voice coil bobbin 3 is inserted into the magnetic gap g.
4 is inserted into the voice coil bobbin 34, and the voice coil bobbin 34 is attached to the plate 3
3 is adhered to and supported on the inner peripheral portion of a damper 37 having an outer peripheral portion fixed to a base-side inner surface 36a of a frame 36 made of steel or the like that opens in a funnel shape and fixed to the front end of the voice coil bobbin 34. A cone paper 3 as a diaphragm with an edge 39a adhered to a flange portion 36b on the outer periphery of the front end of the frame 36 via a gasket 38 at the outer periphery.
9 is adhered on the inner periphery. A lead wire of the voice coil 35 wound around the voice coil bobbin 34 is connected to a terminal 41 attached to a frame 36 by using a tinsel wire 40, and the end of the voice coil bobbin 34 is A cap 42 covering the end opening is adhered.

Further, an input terminal 43 provided on the rear baffle plate 23 in the figure at a predetermined position outside the speaker box 21 and the above-mentioned terminal 41 are connected by a connection line 44, and an audio signal from the input terminal 43 is connected. Is supplied to the voice coil 35 via the connection wire 44, the terminal 41, and the tinsel wire 40.

Then, the speaker unit 2
Baffle plates 22 and 23 on the front and rear surfaces on which 4, 25 are attached
The speaker units 24 and 25 are attached to the mounting holes 22a and 22
Baffle ducts 26, 27 are provided below the front end face 3a so as to symmetrically open outer end ports 26a, 27a on the front and rear surfaces, and the inner end ports 26b and 27b have a required interval. They are opposed at an interval approximately equal to the diameter. These two baffle ducts 26 and 27
A common duct 28 is surrounded at a required interval on the outer periphery of the speaker box 11 and is extended by a required length in the front-rear direction with the interval between the baffle ducts 26 and 27 as a center, and is supported by a support 29 on the bottom surface of the speaker box 11. I have.

Thus, both baffle ducts 26, 27
From the front end 28a of the common duct 28 that surrounds the outer end 26a via the inner end 26b of the front baffle duct 26.
And the distance from the rear end port 28b of the common duct 28 to the outer end port 17a via the inner end port 17b of the rear baffle duct 17 is substantially the same, thus forming a folded duct having a long sound path. doing.

Next, the operation of the loudspeaker device 20 of the present embodiment configured as described above will be described. First, when the front speaker unit 24 and the rear speaker unit 25 are driven, sound waves radiated from the rear surfaces of the two speaker units 24 and 25 generate sound waves with respect to the facing speaker unit, that is, the front speaker unit 24. Are received on the rear speaker unit 25, and on the rear speaker unit 25, on the rear surface of the front speaker unit 24, more specifically, on the cone paper 39 as a diaphragm of each speaker unit 25, 24. Since the speaker units 24 and 25 have the same diameter and the same output, the two speaker units 24 and 25
The sound waves due to the sound pressure radiated from the back of the vehicle, that is, the reaction force are canceled by the mutual radiation force.

The sound wave radiated from the rear surfaces of the two speaker units 24 and 25 enters the common duct 28 in the speaker box 21 from the front end 28a and the rear end 28b. When the sound wave traveling through the front baffle duct 26 and the rear baffle duct 27 reaches the inner end interval, the front baffle duct 26 and the rear baffle duct 27 enter the front baffle duct 26 from the inner end ports 26b and 27b, respectively. The light is radiated from the outer end opening 26a and the outer end opening 27a on the rear baffle plate 23 side.

Here, as described above, the front end 28a of the common duct 28 is connected to the outer end 2 of the front baffle duct 26.
6a and the rear end opening 28 of the common duct 28
Since the distance from b to the outer end port 27a of the rear-side baffle duct 27 is substantially equal, sound waves having the same phase sound pressure are radiated from the outer end port 26a and the outer end port 27a in opposite directions.

Then, the radiation force of the front side baffle duct 26 and the rear side baffle duct 27 cancels out the reaction force due to the radiation from the front side speaker unit 24 and the rear side speaker unit 25 described above. The low-frequency radiation of the baffle ducts 26 and 27 on the side enables powerful low-frequency radiation and high-quality radiation, in which the radiation power of the two speaker units 24 and 25 can be exhibited extremely well. In this way, the two speaker units 24, 2
No. 5 is capable of almost completely exerting the power of radiation of sound, and a high-quality speaker having a strong power of radiation can be realized.

The front speaker unit 24 and the rear speaker unit 25 are connected to the speaker box 2.
1, between the back surfaces of the magnetic circuits, that is, the yokes 31 and 3
Since the rear surfaces of the speaker boxes 1 are joined and arranged in a connected manner, the speaker box 21 is reinforced by strengthening the space between the front baffle plate 22 and the rear baffle plate 23.

The speaker device 20 of the present embodiment is capable of supplying a stereo audio signal to both speaker units 24 and 25 to perform stereo reproduction. Further, as the speaker units 24 and 25, a magnetically shielded speaker unit provided with a cancel magnet and a shield cover which are reversely magnetized with respect to the magnetization direction of the magnet 32 may be used.

The above operation will be described in more detail. When the audio signal is supplied to the input terminal 43 shows the front side speaker unit F ₁ = m ₁ α ₁ force occurs as indicated by 24 in the arrow F _1, similarly the rear side speaker unit 25 in the arrow F ₂ Thus, a force of F ₂ = m ₂ α ₂ is generated, a force of F ₃ = m ₃ α ₃ is generated in the front baffle duct 26 as shown by an arrow F ₃ , and a force of F ₄ = m is generated in the rear baffle duct 27 as shown by an arrow F _{4. 4 α 4} of the force occurs. Where m ₁ , m ₂ ,
m ₃ and m ₄ are the effective masses of the front speaker unit 24, the rear speaker unit 25, the front baffle duct 26 and the rear baffle duct 27, α ₁ , α ₂ and α _{3, respectively.}
And α ₄ are the accelerations of the front speaker unit 24, the rear speaker unit 25, the front baffle duct 26, and the rear baffle duct, respectively.

As described above, the two speaker units 24, 2
5 are respectively driven, the front speaker unit 24
To F ₁ force of the force of -F ₁ is caused by the reaction, with respect to F ₂ force of the rear-side speaker unit 25 in the same manner, the force of -F ₂ is caused by the reaction, the front Bafurefudakuto 26 F ₃ to the direction of force, the reaction -
Force F ₃ is generated, with respect to F ₄ force the rear Bafurefudakuto 27, force -F ₄ is caused by the reaction.

In this embodiment, the front speaker unit 2
4 and the rear-side speaker unit 25 and the front-side baffle duct 26 and the rear-side baffle duct 27 are disposed in the speaker box 21 so as to face each other.
Work 4 reaction force -F ₁ and of the force -F ₂ in the reaction of the rear side speaker unit 25 so as to cancel each other,
Also the reaction force -F ₄ of the reaction force -F ₃ and the rear Bafurefudakuto 27 of the front Bafurefudakuto 26 acts mutually to cancel.

[0032] Therefore -F ₁ = m ₁ α ₁ and -F ₂ = m ₂ α
₂ and -F ₃ = m ₃ α ₃ and -F ₄ = m ₄
When α ₄ is made equal, both speaker units 2
4, 25 and the force -F ₁ of mutual reaction of both Bafurefudakuto 26, 27, -F ₂ and -F _3, support the reaction force due to radiation can prevent the speaker box 21 is moved (sound by -F ₄ The small and lightweight speaker device can exert almost 100% of the radiation power of sound, and can obtain a high-quality speaker device having a very strong radiation sound. There is.

Further, in this embodiment, the force due to the reaction of the sound radiation of the front duct 26 and the force of the sound radiation of the rear baffle duct 27 cancel each other, so that the sound from both the baffle ducts 26 and 27 is canceled. The radiation power is very large, and even a small and lightweight speaker device has the advantage of radiating powerful bass.

In general, in the case of a dynamic speaker, the force F = mα applied to the diaphragm is determined by the following equation (1).

Here, WE is an audio signal input applied to the speaker unit, Bg is a magnetic flux density of a magnetic gap of the magnetic circuit,
Vv is the effective volume of the voice coil, δ is the specific resistance of the material of the voice coil, and Q is the resonance sharpness of the speaker unit.

The force F _D = m applied to the baffle duct
_D alpha _D is determined from the following equation (2) (3). S _S α _S = S _D α _D ‥‥ (2) Here, S _S is the effective area of the speaker unit, the S _D area Bafurefudakuto, gamma is effective vibration radius of the speaker unit, l is the length of Bafurefudakuto, [rho is the density of air.

As described above, the two speaker units 24, 2
5 and the above-mentioned WE, Bg,
Vv, δ, Q or m ₁ , m ₂ and S _S , S _D , γ, l,
By selecting ρ or m ₃ and m ₄ as appropriate, it is possible to select reaction forces −F ₁ = −F ₂ and −F ₃ = −F ₄ which cancel each other under various conditions.

Next, another example of the embodiment of the speaker device according to the present invention will be described with reference to FIG. 2. Parts corresponding to the above-mentioned example shown in FIG. Is omitted.

In the above example, as described above, a general small dynamic speaker unit is used as the speaker units 24 and 25 on the front and rear sides, and the yokes 31 and 3 are used.
The two speaker units 24, 2 are joined by directly joining the backs of the two.
5 is a magnetic shield configuration, but the speaker device 50 of the present example is configured such that the front speaker unit 24 and the rear speaker unit 25 are connected to the yokes 31 and 31 of the magnetic circuit.
A magnetic shield is formed by interposing a cancel magnet 51 therebetween.

That is, in the speaker device 50 of the present embodiment,
As shown in FIG. 2, the rear speaker unit 25 is configured such that the magnet 52 is reversely magnetized with the magnet 32 of the front speaker unit 24, and between the yokes 31, 31 of the speaker units 24, 25. Next, the ring-shaped cancel magnet 51 is connected to the magnets 32 and 52.
In this case, both speaker units 24 and 25 are magnetically shielded by being connected with the same polarity.

The other components of the speaker device 50 of the present embodiment, that is, the baffle ducts 26 and 27, the common duct 28, and the like have the same configuration as that of the above-described example shown in FIG.

It can be easily understood that the loudspeaker device of this embodiment configured as shown in FIG. 2 can obtain the same operation and effect as the loudspeaker device of the above-described embodiment shown in FIG.

[0043] equal to the force -F ₂ in the reaction of the front side of the speaker unit reaction force -F ₁ and the rear-side speaker unit 25 of the 24 in the embodiment of the above embodiment, also, the reaction of the front Bafurefudakuto 26 has been described as equal to the force -F ₃ and the force -F ₄ of the reaction of the rear Bafurefudakuto 27, since the aforementioned operational effect alone reduces without canceled reaction forces of each other described above can be obtained, these It is not always necessary to make the reaction forces of the two equal.

Further, the present invention is not limited to the above-described embodiment, and it is needless to say that various configurations can be adopted without departing from the spirit of the present invention.

[0045]

As described above, in the speaker device according to the present invention, the speaker units are mounted on one side and the other side of the speaker box and the baffle duct is provided.
The mutual reaction force of the two speaker units and the mutual reaction force of the two baffle ducts can be canceled or reduced by the speaker units and the baffle ducts, and the vibration of the speaker box is prevented, and the sound of the speaker device is prevented. The weakening of the radiation power can be improved, and the bass power can be enhanced by the radiation power of both baffle ducts, so that a small and lightweight speaker device with high sound quality can be obtained.

Further, in the present invention, the magnetic circuits of the two speaker units are joined back-to-back, so that the two speaker units can be magnetically shielded and the magnetic shield type speaker device can be easily manufactured. And the speaker box is reinforced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a speaker device according to the present invention.

FIG. 2 is a sectional view showing another example of the speaker device according to the present invention.

FIG. 3 is a cross-sectional view illustrating an example of a conventional speaker device.

[Explanation of symbols]

21: speaker box, 22, 23: baffle plate, 2
4, 25: speaker unit, 26, 27: baffle duct, 28: common duct, 31: yoke, 32: magnet, 39: cone paper, 51: cancel magnet

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Akihiro Akiyama 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Naoki Watanabe 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Kenji Tokushige 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation

Claims (4)

[Claims] 1. A speaker device in which a speaker unit for sound emission is mounted on a baffle plate on one surface of a speaker box and a baffle duct for low sound emission is provided, wherein a reaction of the speaker unit on another surface of the speaker box is provided. The other speaker unit for sound emission that generates a reaction force substantially equal to the force of the above is installed, and another baffle duct for low sound emission that generates a reaction force substantially equal to the reaction force of the baffle duct is provided. Characteristic speaker device. 2. The speaker device according to claim 1, wherein the two speaker units are attached to a baffle plate of the speaker box facing each other so as to face each other, and the back sides of the magnetic circuits are joined to each other. The speaker device, wherein the two baffle ducts are provided so as to face and communicate with the two baffle plates. 3. The speaker device according to claim 1, wherein the two baffle ducts are provided as folded ducts. 4. The speaker device according to claim 1, wherein the two speaker units are joined between magnetic circuits via a cancel magnet.