JPH11341586A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small-sized lightweight device that prevents a small-sized lightweight speaker box from being rocked with a simple construction and reproduces low sound excellently by providing a vibrating body generating acting force reversely to the sound radiation direction of a speaker. SOLUTION: One end of a support 20 projected toward the side of a speaker 3 is fixed to a part inside of a back face plate 1B of a speaker box 1 corresponding to the mounting position of the speaker 3 and a weight 22a with prescribed weight is hung from the free end of the support 20 via an elastic body 21 such as a plate spring member. Then, the elastic body 21 and the weight 22a are made so as to constitute a vibrating body 22. In this case, the relation of F2 =F1 +FD holds, where F1 is made to sound radiation force by the vibration of a diaphragm 10 of the speaker 3, FD is made to radiation force of a duct 18 and F2 is made to acting force reverse to the sound radiation direction generated by making driving force as reacting force -F1 reverse to the sound radiation direction of the sound radiation force F1 of the speaker 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a small and lightweight speaker device.

[0002]

2. Description of the Related Art Generally, as an effective means for extending a low-frequency reproduction limit of a small and lightweight speaker device, an opening and a duct are provided in a baffle plate provided with a speaker, and a phase of a sound emitted from a back surface of a diaphragm of the speaker is provided. A bass reflex type (phase inversion type) speaker device in which the sound is emitted from the diaphragm of the speaker to the front by inverting the sound through the duct to the outside through the duct to prevent distortion of the bass range is good. Are known.

In such a phase inversion type speaker device, a speaker 3 is fixed opposite a speaker sound emission hole 2a formed in a baffle plate 2 provided on a front surface of a speaker box 1 as shown in FIG.

For example, as shown in FIG. 7, the speaker 3 is provided with a ring-shaped magnet 4, a plate 5 and a yoke 6 mounted so as to sandwich the ring-shaped magnet 4, and an inner peripheral side of the plate 5 and a yoke. The magnetic gap 7 is formed between the center gap 6 and the center pole 6a. Plate 5
The frame 8 of the speaker 3 is attached to the
An edge 9 is provided on the outer peripheral portion of the diaphragm 8, and the outer peripheral portion of the cone-shaped diaphragm 10 is held on the frame 8 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, and the voice coil 12 is fixed by a center pole 6a of the plate 5 and the yoke 6. It is designed to be inserted into the formed magnetic gap 7. Reference numeral 17 denotes a damper for holding the voice coil 12 in the magnetic gap 7.

An acoustic signal from an input terminal 13a provided at a predetermined position outside the speaker box 1 is connected to a connection line 1
4a to the terminal 15 of the speaker 3 via the terminal 15a.
Of the voice coil 12 via the tinsel wire 16
To supply.

[0007] Further, the speaker sound emission hole 2a of the baffle plate 2
A duct 18 having an opening 18a is provided on the same surface as the above, and the phase of the sound emitted from the back surface of the diaphragm 10 of the speaker 3 is inverted and radiated from the duct 18 to the outside of the speaker box 1. The bass range of the sound coming out from the front is expanded.

As described above, by using a phase inversion type speaker device, the bass reproduction limit can be lowered as compared with the sealed type, and about 80% of the bass resonance frequency f ₀ of the speaker 3 can be obtained.
It is said that the low-frequency reproduction range can be extended to a degree.

In such a speaker device, the sound radiation force F ₁ due to the vibration of the diaphragm 10 of the speaker 3 is obtained by multiplying the effective mass M ₁ of the speaker 3 by the acceleration α _{1 at} which the diaphragm 10 moves, that is, F ₁ = It can be expressed as M ₁ α ₁ . To such sound radiation force F _1, the reaction force -F ₁ toward the speaker box 1 from the rear side of the diaphragm 10 also becomes remarkable the smaller the volume of the speaker box 1 speaker device is small and light, The air in the speaker box 1 is repeatedly compressed and expanded by the vibration of the diaphragm 10, and this air is
As a result, the speaker box 1 is swung, and there is a problem that bass reproduction is hindered.

In order to solve such a problem, the present applicant has previously proposed a speaker device as shown in FIG. 8. In FIG. 8, parts corresponding to those in FIG. Description is omitted.

In FIG. 8, a speaker box 1 is formed of a synthetic resin into a box shape integrally with a baffle plate 2. A speaker 3 having the same configuration as that described in detail with reference to FIG. 7 is fixed to the speaker sound emission hole 2a formed on the upper side of the baffle plate 2. The first duct 18 and the opening 18a disposed below the baffle plate 2 are integrally formed when the baffle plate 2 is formed.

A speaker sound emission hole 2b is formed at a position opposite to the speaker sound emission hole 2a formed on the baffle plate 2 above the rear face plate 1B, so that the second speaker 3b, preferably the speaker 3 and the back surface, are connected to each other. Are fixed to the rear panel 1B so as to face the speaker sound emission hole 2b, and the second duct 18b having a larger duct diameter than the first duct 18 overlaps within a predetermined length of the first duct 18. And planted integrally with the rear plate 1B so that a concentric cross section is formed,
And it is configured so as to increase the equivalent mass M _D and the equivalent resistance R _D of the air emitted through the opening 18c of the second duct 18b in the opening 18a of the first duct 18.

Further, the first and second speakers 3 and 3b
Are supplied with the same input acoustic signal via input terminals 13a and 13b and connection lines 14a and 14b disposed on the rear panel 1B.

According to the speaker device shown in FIG.
Radiation force F _D1 between the first and second ducts 18 and 18b
And reaction force -F _D1 and -F _D2 is the reaction force -F ₁ and -F ₂ of emittance of the first and second speakers 3 and 3b so are respectively offset F ₁ and F ₂ F ₁ of F _D2 ≒ F ₂ Tosureba can be each other to cancel.

[0015]

However, the above-described structure requires a pair of speakers 3 and 3b having substantially the same structure in the speaker box 1, which makes it difficult to reduce the size of the speaker box 1 and increases the cost. was there.

Further, the vibration system of the speaker was made equal.
In the two speakers, the higher the lowest resonance frequency f ₀ , the larger the resonance sharpness Q of the diaphragm becomes in proportion to f ₀ , so that there is a problem that it is not suitable for low-frequency reproduction.

An object of the present invention is to provide a speaker device which solves the above-mentioned problems, and which has a simple structure and can prevent swinging of a small and lightweight speaker box and can reproduce good bass sound. To get the device.

[0018]

A speaker device according to the present invention is provided with a speaker attached to a baffle plate on the front of a speaker box, and disposed inside the speaker box.
A vibrating body that generates an acting force in a direction opposite to the sound emission direction using a reaction force in a direction opposite to the sound emission direction of the speaker as a driving force.

According to the present invention, the vibration is generated inside the speaker box by using the reaction force in the direction opposite to the sound emission direction of the speaker as the driving force, and generates the action force in the direction opposite to the sound emission direction. Since the body is provided, the reaction force of the sound radiation force of the loudspeaker can be canceled or attenuated with a simple structure in which the weight is suspended via an elastic body, for example, and good bass reproduction can be performed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker device according to the present invention will be described below with reference to FIGS. In FIG. 1, portions corresponding to FIG. 7 are denoted by the same reference numerals.

FIG. 1 is a side sectional view of the speaker device of the present embodiment, and the configuration of the phase inversion type speaker device in FIG. 1 is the same as in FIG. In the speaker device shown in FIG. 1, the speaker box 1 is formed into a substantially rectangular parallelepiped shape with an ABS resin or the like, and the speaker 3 is fixed to a speaker sound emission hole 2a formed in a baffle plate 2 provided on the front surface of the speaker box 1. I do.

The speaker 3 is, for example, as shown in FIG.
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 an inner peripheral side of the plate 5 and a center pole 6 of the yoke 6 are provided.
a magnetic gap 7 is formed between the diaphragm 5 and the frame 5, the frame 8 of the speaker 3 is mounted on the plate 5, and an edge 9 is provided on the outer peripheral portion of the diaphragm 10; Is held by the frame 8.

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, and the voice coil 12 is mounted on the center pole 6 of the plate 5 and the yoke 6.
a 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 acoustic signal from an input terminal 13a provided at a predetermined position outside the speaker box 1 is supplied to a terminal 15 of the speaker 3 via a connection line 14a.
5 from the voice coil 1 through the tinsel wire 16.
2.

The speaker sound emission hole 2a of the baffle plate 2
A duct 18 having an opening 18a is provided on the same surface as the above, and the phase of the sound emitted from the back surface of the diaphragm 10 of the speaker 3 is inverted and radiated from the duct 18 to the outside of the speaker box 1. The bass range of the sound coming out from the front is expanded.

In the present embodiment, as shown in FIG. 1, one end of a column 20 protruding toward the speaker 3 is fixed to a portion corresponding to the mounting position of the speaker 3 inside the rear plate 1B of the speaker box 1. A weight 22a having a predetermined weight is suspended from the free end of the support 20 via an elastic body 21 such as a leaf spring material. In this example, the elastic body 21 and the weight 2
2a constitutes the vibrating body 22. This pillar 2
0, the elastic body 21 and the weight 22a have an external configuration as shown in FIG. 2, for example. 20a is a holding portion of the support 20.

In this case, in this example, the sound radiation force due to the vibration of the diaphragm 10 of the speaker 3 is defined as F ₁ and the duct 1
A duct radiation force 8 and F _D, sound emission direction opposite to the direction of the reaction force of the sound radiation force F ₁ of the vibrator 22 is a speaker 3 -
When the sound effect force the radial direction opposite to generate F ₁ as the driving force and the F _2, which as F ₂ = F ₁ + F _D is satisfied.

That is, in this case, when the effective mass of the vibration system of the speaker 3 is M ₁ and the acceleration at which the diaphragm 10 of the speaker 3 moves is α ₁ , the sound radiation force F ₁ is F ₁ = M ₁ α ₁ Assuming that the load mass of the air in the duct 18 is M _D and the acceleration in which the air moves in the duct 18 is α _D , the radiation force F _D of the duct 18 is expressed as F _D = M _D α _D The mass of the vibrating body 22 is represented by M _2, and the acceleration at which the vibrating body 22 moves is α
When the ₂ and as _{M 2 α 2 = M 1 α} 1 + M D α D holds.

When the effective area of the diaphragm 10 of the speaker 3 is S and the sectional area of the duct 18 is S _D , α _D = S / S _D · α ₁ , so α ₂ = α ₁ In this case, M ₂ α ₁ = α ₁ (M ₁ + M _D · S / S _D ), and M ₂ = M ₁ + M _D · S / S _D , whereby the vibration formed by the elastic body 21 and the weight 22 a The mass M _{2 of the} body 22 can be determined.

In the present embodiment, by satisfying the above expression, the sound radiation force F ₁ and a duct radiation force F _D sound radiation power of the speaker 3 and the opposite direction of the reaction forces - driving (F ₁ + F _D) can be canceled by the action force F ₂ of the vibrator 22 to generate a force, without sound radiation force of the speaker 3 is impaired, i.e., without the speaker box 1 swings, good bass reproduction it can.

Therefore, according to the present embodiment, the reaction force of the sound radiation force can be canceled or attenuated with a simple structure in which the weight is suspended via the elastic body 21 on the support column 20 provided inside the speaker box 1. There is a profit that can reproduce the low tone.

FIG. 3 shows another example of the embodiment of the present invention. The example of FIG. 3 will be described.
Parts corresponding to the example of FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the example shown in FIG. 3, one end of the column 20 is fixed to the rear side of the yoke 6 of the speaker 3 so that the column 20 of FIG. 1 projects in the direction of the rear panel 1B of the speaker box 1.
A weight 22a having a predetermined weight is suspended from the free end of the support 20 via an elastic body 21 such as a leaf spring material. Other configurations are the same as those in the example of FIG.

It can be easily understood that the same effects as those of the example of FIG. 1 can be obtained in the example of FIG.

FIG. 4 shows another example of the embodiment of the present invention. 4 will be described. In this FIG. 4 example, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the example shown in FIG. 4, a weight 22a having a predetermined weight is suspended from the free end of an elastic body 21 such as a leaf spring material having one end fixed to the inside of the upper surface plate 1C of the speaker box 1 by a holding portion 20a. The vibrating body 22 is constituted by the body 21 and the weight 22a. The other configuration is the same as that of FIG.

It can be easily understood that the same effect as that of the example of FIG. 1 can be obtained in the example of FIG.

FIG. 5 shows another embodiment of the present invention. In describing the example of FIG. 5, the same reference numerals are given to portions corresponding to FIG. 1, and detailed description thereof will be omitted.

The example shown in FIG. 5 is provided with two vibrators 22 ₁ and 22 ₂ as shown in FIG.
Elastic bodies 21 ₁ and 21 ₂ of the respective free end respective predetermined weight of the weight 22a ₁ of the holding portion 20a ₁ and 20a ₂ by a predetermined distance apart on the inside of the upper plate 1C of the plate spring member or the like fixing the respective end and hanging 22a _2, respectively vibrator 2 by the elastic body 21 ₁ and 21 ₂ and the weight 22a ₁ and 22a ₂
It is obtained so as to constitute the 2 ₁ and 22 _2. The vibrator 22 ₁ and 22 ₂ of the elastic body 21 ₁ and 21 ₂ by changing the length, etc., can be such that different resonance frequencies.
Other configurations are the same as in the example of FIG.

In this case, each of the vibrating bodies 22 ₁ and 22 ₂ acts in a direction opposite to the sound radiation direction generated by using the reaction force −F _{1 in the} direction opposite to the sound radiation direction of the sound radiation force F ₁ of the speaker 3 as a driving force. when the force was F ₂₁ and F _22, to as _{F 21 + F 22 = F 1} + F D is satisfied.

[0041] That is, in this case the vibrator 22 ₁ and 22 ₂
Are defined as M ₂₁ and M _22, and the respective vibrators 22 ₁
And 22 ₂ are α ₂₁ and α ₂₂ , M ₂₁ α ₂₁ + M ₂₂ α ₂₂ = M ₁ α ₁ + M _D α _D is established.

At this time, when α ₂₁ = α ₂₂ = α ₁ , M ₁ + M _DS / S _D = M ₂₁ + M ₂₂ . The mass M _{21 of} each of the vibrators 22 ₁ and 22 ₂
And the other can be also found be determined either of M _22. Otherwise, the configuration is the same as in the example of FIG.

It can be easily understood that the same operation and effect as in the example of FIG. 1 can be obtained in the example of FIG.

FIG. 6 shows another example of the embodiment of the present invention. In describing the FIG. 6 example, the same reference numerals are given to parts corresponding to the FIG. 1 example, and detailed description thereof will be omitted.

In the example of FIG. 6, one end of a column 20 projecting toward the speaker 3 is fixed to a portion of the rear panel 1B of the speaker box 1 corresponding to the mounting position of the speaker 3. A ring-shaped weight 20b having a predetermined weight is fixed to an end of the support 20 via an elastic body 21a such as a disc-shaped leaf spring material around the support column 20, and an elastic body 21a such as this disc-shaped leaf spring material is fixed. And a ring-shaped weight 22b. Other configurations are the same as those in the example of FIG.

It can be easily understood that the same effect as that of the example of FIG. 1 can be obtained in the example of FIG.

In the above-described example, one duct 18 is provided in the speaker box 1. However, the duct in the speaker box 1 is a so-called folded duct, and the reaction force of the radiation force of the folded duct cancels each other. if so that, it is not necessary to consider the duct radiation force F _D in the above as a matter of course.

Further, the present invention is not limited to the above-described example, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0049]

According to the present invention, there is provided a vibrating body which is disposed inside a speaker box and uses a reaction force in a direction opposite to the sound radiation of the speaker as a driving force and generates an operation force in a direction opposite to the sound radiation direction. Since it is provided, for example, the reaction force of the sound radiation force of the speaker can be canceled or attenuated with a simple configuration in which the weight is suspended via an elastic body, and the radiation force of the sound of the speaker is impaired. That is, there is an advantage that the bass reproduction is good without the speaker box swinging.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing an example of a main part of FIG.

FIG. 3 is a side sectional view showing another example of the embodiment of the present invention.

FIG. 4 is a side sectional view showing another example of the embodiment of the present invention.

FIG. 5 is a side sectional view showing another example of the embodiment of the present invention.

FIG. 6 is a side sectional view showing another example of the embodiment of the present invention.

FIG. 7 is a side sectional view showing an example of a conventional speaker device.

FIG. 8 is a side sectional view showing an example of a conventional speaker device.

[Explanation of symbols]

1 speaker box, 1B rear plate, 1C top plate, 2 baffle plate, 3 speakers, 18 duct, 20 columns, 21, 21a elastic body, 22cm
{Vibrator, 22a, 22b} Weight

Claims (2)

[Claims] A speaker attached to a baffle plate on a front surface of the speaker box; and a speaker disposed inside the speaker box, wherein a reaction force in a direction opposite to a sound emission direction of the speaker is used as a driving force to drive the sound emission direction. A speaker device comprising: a vibrating body that generates an acting force in a reverse direction. 2. The speaker device according to claim 1, wherein a weight of the vibrating body is suspended in the speaker box via an elastic body.