JP2000013888A - Speaker and speaker system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small-sized light weight speaker system where rocking of a small-sized light weight speaker box is prevented with a simple structure and a low frequency sound is reproduced excellently. SOLUTION: In the speaker system having a speaker 3 mounted on a baffle plate 2 in front of a speaker box 1, a vibrating body 20 that produces an operating force F2 in a direction opposite to a sound emission direction is provided around a midpoint of a damper 17 of the speaker 3 by using a reaction force -F1 in a direction opposite to the sound emission direction of the speaker 3 as a driving force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and lightweight speaker device and a speaker used therein.

[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. 2, the speaker 3 is provided with a ring-shaped magnet 4, a plate 5 and a yoke 6 attached 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. As the damper 17, for example, a spiral damper in which cloth is impregnated with a synthetic resin is used, and the damper 17 has a predetermined compliance (elasticity).

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 through a connection line 14a.
5 from the voice coil 1 through the tinsel wire 16.
2

[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. 3. In FIG. 3, parts corresponding to those in FIG. Detailed description is omitted.

In FIG. 3, 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. 2 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 of F _D2 so are respectively offset, the radiation power of the first and second speakers 3 and 3b F ₁
And a reaction force -F ₁ and -F ₂ of F ₂ F ₁ ≒ F ₂ Tosureba can 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, Q, which is the resonance sharpness of the diaphragm with the higher bass resonance frequency f ₀ , is the higher bass resonance frequency f _0.
Therefore, there is a disadvantage that it becomes unsuitable for reproduction in a low frequency range because the frequency increases in proportion to.

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. A device and a speaker are to be obtained.

[0018]

According to the present invention, there is provided a speaker device having a speaker attached to a baffle plate on the front of a speaker box. A vibrating body that generates an acting force in a direction opposite to the sound radiation direction using a reaction force in the direction as a driving force is provided.

According to the present invention, the vibrator which generates an operating force by using the reaction force in the direction opposite to the sound emission direction of the speaker as a driving force is provided near the middle point of the speaker damper. The sound radiation force of the speaker box is canceled by the acting force of the vibrating body, and the vibration of the speaker box due to the sound radiation can be eliminated.

Therefore, according to the present invention, with a simple structure in which the vibrating body is provided near the midpoint of the damper of the speaker, the swing of the speaker box due to the radiation of sound can be eliminated, and good bass reproduction can be achieved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a speaker device according to the present invention will be described below with reference to FIG. In FIG. 1, portions corresponding to FIGS. 2 and 3 are denoted by the same reference numerals.

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

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. 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. As the damper 17, for example, a spiral damper in which cloth is impregnated with a synthetic resin is used. This damper 17 has a predetermined compliance (elasticity).

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 first duct 18 having an opening 18a on the same surface as the first duct 18, and a second duct 18b having a larger diameter than the first duct 18 is overlapped within a predetermined length of the first duct 18, and The second duct 18b is planted integrally with the rear plate 1B so as to form a concentric cross section.
The air is radiated from the opening 18a of the first duct 18 through the opening 18c.

In this case, the first and second ducts 18
And reaction force of the duct radiation force F _D1 and F _D2 between 18b -
F _D1 and -F _D2 are each offset from one another, the duct radiation force F _D1 and F _D2 of the first and second ducts 18 and 18b
In some cases, the speaker box 1 does not swing.

Further, the phase of the sound emitted from the back of the diaphragm 10 of the speaker 3 is inverted and radiated out of the speaker box 1 from the first and second ducts 18 and 18b. The low range of the sound coming out of the front of the is expanded.

In this embodiment, as shown in FIG. 1, an annular vibrating body 20 having a predetermined mass M ₂ along the groove of the damper 17 is attached and fixed near the middle point of the damper 17 of the speaker 3.

In this case, the compliance (elasticity) of the damper 17 of the speaker 3 is utilized, and the vibrating body 20 uses the reaction force -F _{1 in the} direction opposite to the sound emission direction of the speaker 3 as the driving force and the direction opposite to the sound emission direction. to as to generate an action force F _2.

In this case, the vibrating body 20 is provided near the midpoint where the damper 17 of the speaker 3 is easily vibrated.
Also, when the vibrating body 20 is provided on the damper 17 on the diaphragm 10 side of the damper 17, the speaker 3 can be easily assembled.

In this embodiment, the sound radiation force caused by the vibration of the diaphragm 10 of the speaker 3 is defined as F ₁ ,
When the reaction force −F ₁ in the 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 the driving force is F ₂ , F ₁ ≒ F ₂ ‥‥ (1) is established.

Here, the acting force F ₂ is given by F ₂ = M ₂ α ₂ ‥‥ (2), where α ₂ is the moving acceleration of the vibrating body 20, and the sound radiation force F ₁ is F ₁ = M _{Since 1} α ₁ ‥‥ (3), the mass of the vibrating body 20 can be obtained from the equations (1), (2), and (3).

By satisfying the above-formula (1) in [0034] this example, generates a sound radiation force F ₁ of the speaker 3, a reaction force -F ₁ of this sound radiation forces in the opposite direction of the speaker 3 as a driving force can be canceled by the action force F ₂ of the vibrating body 20, without radiation force of the sound of the speaker 3 is impaired, i.e., without the speaker box 1 swings can better bass reproduction.

Therefore, according to the present embodiment, the vibrating body 20 is provided near the middle point of the damper 17 of the speaker 3 with a simple structure.
The swing of the speaker box 1 due to the emission of sound can be eliminated, and there is an advantage that even a small and lightweight speaker device can reproduce good bass sound.

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

[0037]

According to the present invention, there is an advantage that a small and lightweight speaker device which can prevent swinging of a small and lightweight speaker box with a simple structure and can reproduce good bass sound can be obtained.

[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 side sectional view showing an example of a conventional speaker device.

FIG. 3 is a side sectional view showing an example of a conventional speaker device.

[Explanation of symbols]

1 speaker box, 1B rear plate, 2 baffle plate, 3 speaker, 6 yoke, 18, 18b
{Duct, 20} vibrator

Claims (2)

[Claims] 1. A speaker device having a speaker mounted on a baffle plate on a front surface of a speaker box, wherein a reaction force in a direction opposite to a sound radiation direction of the speaker is used as a driving force near a midpoint of a damper of the speaker. A speaker device provided with a vibrating body that generates an acting force in a direction opposite to a sound radiation direction. 2. A vibrating body that generates an acting force in a direction opposite to the sound radiation direction by using a reaction force in a direction opposite to the sound radiation direction of the speaker as a driving force near a midpoint of a damper of the speaker. Features speaker.