JP2000023285A - Speaker and speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offset or attenuate reactive force of sound radiating force to prevent oscillation of a compact and lightweight device and to radiate a powerful low band by communicating an openings provided on double oscillation plates with each other reversing a direction in which the double oscillation plates move, and radiating the sound radiating force in an opposite direction to the sound radiating force of one oscillation plate from the other oscillation plate. SOLUTION: A first oscillation plate 10a and a second oscillation plate 10b of funnel shapes are joined to upper parts of wound inside/outside voice coil bobbins 11a and 11b by way of an adhesive material and their maximum diameter parts are fixed on peripheral parts of respective frames 8. Moreover, on the frame 8 between the first oscillation plate 10a and the second oscillation plate 10b the specified number of opening ports 21 and 22 is dug. In this state, when the first oscillation plate 10a is moved in an F1 direction, a driving magnetic circuit is selected so that the second oscillation plate 10b is driven in a direction F2 similar to the F1 direction of the reactive force of the first oscillation plate 10a.

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 more particularly to a speaker device capable of canceling a reaction of sound radiation from a speaker device using one speaker.

[0002]

2. Description of the Related Art Conventionally, as an effective means for extending the low-frequency reproduction limit of a speaker device, for example, 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 adjusted. A bass reflex type (phase inversion type) speaker device which inverts and radiates to the outside through an opening through a duct to enhance the sound wave emitted from the diaphragm of the speaker to the front so as not to distort the bass range is well known. Have been.

In such a phase inversion type speaker device, as shown in FIG. 4, a speaker 3 is fixed facing 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. 4, for example, the speaker 3 is provided with a ring-shaped magnet 4, a plate 5 having a center hole, and a yoke 6 attached so as to sandwich the ring-shaped magnet 4. A magnetic gap 7 is formed between the inner peripheral side of the yoke 6 and the center pole 6a of the yoke 6.
A frame 8 of the speaker 3 is mounted on the plate 5, and an edge 9 is provided on an outer peripheral portion of the frame 8, and the outer peripheral portion of the cone-shaped diaphragm 10 is held by the edge 9 with a gasket or the like.

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 formed by a center pole 6 a 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.

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

By using a phase-inversion type speaker device as described above, the bass reproduction limit can be reduced as compared with the closed type speaker device, and about 80% of the lowest 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 in FIG.
Acceleration acting on the diaphragm 10 of the loudspeaker on the equivalent mass M ₁ of
_1, ie, F ₁ = 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 acts as a force to return the diaphragm 10 to its original position. There was a problem that was hindered.

In order to solve such a problem, the present applicant has previously proposed a speaker device as shown in FIG. 5. In FIG. 5, portions corresponding to those in FIG. 4 are denoted by the same reference numerals.

In FIG. 5, a speaker box 1 is formed of a synthetic resin box and is integrally formed with a baffle plate 2. A speaker 3 having the same configuration as that described in detail with reference to FIG. 4 is fixed to the speaker sound emitting 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. Is fixed to the rear plate 1B so that the first
Second duct 18b having a larger duct diameter than the second duct 18
Are overlapped within a predetermined length of the first duct 18 and are planted integrally with the rear plate 1B so as to form a concentric cross section, and the first through the opening 18c of the second duct 18b.
Equivalent mass M of air radiating to the opening 18a of the duct 18
_D and the equivalent resistance _RD are configured to be large.

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 3a and 3b F
₁ and reaction force -F ₁ and -F ₂ of F ₂ is F ₁ ≒ F ₂ Tosureba can cancel each other.

[0015]

[SUMMARY OF THE INVENTION] However, in the speaker box 1 in order to as in the above-mentioned structure does not swing supporting reaction forces -F ₁ by acting force F ₁ of the speaker 3 small and lightweight speaker box 1 In addition, there is a problem that a pair of speakers 3 and 3b having substantially the same structure is required, which is not only a bottleneck for miniaturization but also expensive.

An object of the present invention is to provide a speaker and a speaker device which solve the above-mentioned problems, and an object to be solved by the invention is to provide a speaker which is provided in a small and lightweight speaker box with one speaker. The reaction force of the sound radiation force is offset or attenuated to prevent the loudspeaker from swinging, thereby emitting a powerful low frequency band.

[0017]

The loudspeaker of the present invention has a first feature.
A first drive coil for driving the first diaphragm, a second drive coil for driving a second diaphragm arranged in parallel behind the first diaphragm, and the first and second diaphragms And an opening formed between the first and second drive coils so as to drive the first and second drive coils in mutually opposite directions.

According to the speaker device of the present invention, the opening provided between the diaphragms of the speaker having the double diaphragm is communicated with the volume of the speaker box, the moving direction of the double diaphragm is reversed, and The sound radiation force in the opposite direction to the sound radiation force of the plate is emitted from the other diaphragm.

According to the loudspeaker and the loudspeaker device of the present invention, the depth direction of the loudspeaker box can be reduced as compared with the case where two loudspeakers are used back to back, and the reaction force due to the loudspeaker sound radiation force is canceled by one loudspeaker. The swing of the speaker box is prevented, and the low range is increased, so that the sound pressure in the low range can be doubled.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A small speaker according to the present invention will be described below in detail with reference to FIGS. In the present invention, parts corresponding to the speakers shown in FIGS. 4 and 5 are denoted by the same reference numerals.

FIG. 1 is a side sectional view of a speaker used in the speaker device of the present embodiment, 3 is a small speaker of the present embodiment as a whole, and a yoke 6 is a disk-shaped portion made of a plate material such as pure iron. Magnet guide portion 6 comprising a columnar center pole 6a erected at the center of the cylindrical portion and a step formed concentrically with the center pole 6a in a disk-shaped portion.
b is formed integrally.

A ring-shaped first magnet 4a magnetized with N and S, for example, in the thickness direction of ferrite or the like is bonded on the disc-shaped portion of the yoke 6 via an adhesive. The inner diameter of the ring-shaped first magnet 4a is fitted and positioned in a step portion of a magnet guide portion 6b formed in a disk-shaped portion of the yoke 6.

The lower plate 5a is joined to the first magnet 4a. In this case, the gap guide is inserted into the center pole, the inner diameter of the lower plate 5a is inserted into the outer diameter of the gap guide and fixed, and the first magnetic gap 7 having a predetermined width is fixed.
a is formed.

The lower plate 5a is made of pure iron or the like in a disk shape.
A first magnetic gap 7a is formed between the inner diameter of the lower plate 5a and the outer diameter of the center pole 6a by a punched plate material having a through hole at the center.

On the lower plate 5a, a ring-shaped second magnet 4b magnetized with, for example, N and S in the thickness direction of ferrite or the like is bonded via an adhesive.

Further, the upper plate 5b is joined to the second magnet 4b. In this case, the gap guide is left inserted in the center pole 6a, the adhesive is applied to the upper surface of the second magnet 4b, and the inner diameter of the upper plate 5b is inserted and fixed to the outer diameter of the gap guide. The upper plate 5b is made of pure iron or the like in the shape of a disk, and is a punched plate material having a through hole in the center, and is formed around the inner peripheral edge of the through hole and the center pole 6a.
The second magnetic gap 7b is formed between the outer diameters of the first magnetic field and the second magnetic field.

The diameter of the through hole formed in the center of the lower plate 5a is selected to be smaller than the diameter of the through hole formed in the center of the upper plate 5b.

A metal part of a magnetic circuit is formed by fixing a frame 8 formed in a funnel shape with a step by using a steel material or the like to the upper plate 5b.

The outer voice coil 1 wound around the cylindrical outer voice coil bobbin 11b is located in the second magnetic gap 7b.
2b is inserted via a voice coil spacer, and the outer voice coil bobbin 11b is held via a second damper 17b having a corrugation of a waveform so as to be able to swing up and down.

The inner diameter of the second damper 17b is joined to the upper end of the outer voice coil bobbin 11b via an adhesive, and the outer diameter is joined to the outer periphery of the bottom surface of the frame 8. Further, the inner diameter of the funnel-shaped second diaphragm 10b having a free or fixed edge 9b made of paper or the like is joined to the upper outer diameter of the outer voice coil bobbin 11b.
The largest diameter portion of the diaphragm 10b is fixed to the peripheral portion of the step 8a of the frame 8 via the second gasket 19b.

Further, the inner voice coil 12a wound around the inner voice coil bobbin 11a is inserted into the first magnetic gap 7a via the voice coil spacer, and the first voice coil has a corrugation of a waveform which can swing vertically. Damper 1
The inner voice coil bobbin 11a is held via the base 7a.

The inner diameter of the first damper 17a is bonded to the upper portion of the inner voice coil bobbin 11a via an adhesive, and the outer diameter portion is bonded to the vicinity of the inner circumference of the second edge 9b of the second diaphragm 10b. I do.

At this time, the terminal of the tinsel wire 16a of the inner voice coil 12a is connected to the lead 2 of the outer voice coil 12b.
0 is fixed on the second diaphragm 10b with a solder.

Further, the inner diameter of the funnel-shaped first diaphragm 10a having the fixed edge 9a is joined to the upper portion of the inner voice coil bobbin 11a via an adhesive, and the maximum diameter portion of the first diaphragm 10a is connected to the frame. 8 is fixed to the upper peripheral portion via a first edge 19a.

At the upper end of the inner voice coil bobbin 11a or at the inclined portion of the first diaphragm 10a, a cap 22 formed in a dome shape with a bonding portion 23 made of a material such as aluminum is provided with a cap 22 of the first voice coil bobbin 11a. It is joined via an adhesive so as to cover the upper end.

The tinsel wire 16a is connected to the second diaphragm 10b.
From the terminal 15 and attached to the frame 8
The audio signal is supplied to the inner voice coil 12a and the outer voice coil 12b connected in parallel with each other via.

The first diaphragm 10a and the second diaphragm 1
0b, a predetermined number of openings 21 and 22
Is pierced. Note that this opening may be a heat-dissipating punching window usually formed in the frame 8.

In the speaker 3 having the above configuration, the first and second
Assembling was performed in a state in which the magnets were previously magnetized, but the magnets may be magnetized after the speaker 3 is assembled. Also, the magnetization directions of the first and second magnets in FIG.
The inner and outer voice coils 12
may be inverted polarity in response to the winding direction of a and 12b, short, in the speaker 3 of the present embodiment when the first diaphragm 10a is moved in the direction of arrow F _1, the second diaphragm 10b of but a current direction or the voice coil to the first diaphragm 10a reaction force -F ₁ direction drive magnetic circuit as to be driven in the same direction of F ₂ with the respective polarity and respective voice coil of magnet What is necessary is just to select a winding direction.

FIG. 2 is a side sectional view of the speaker device when the speaker 3 shown in FIG. 1 is disposed in the speaker box 1 having the phase inversion type ducts 18 and 18b having the same configuration as that of FIG. . In FIG. 2, the speaker 3 has substantially the same configuration as that described in FIG. 1, but the speaker 3 of the present example has first and second diaphragms 10 a and 10 a with leading lines of the inner voice coil 12 a and the outer voice coil 12 b. 10b pulled out to 10b and attached to the frame 8
And 15b are separately connected via tinsel wires 16a and 16b.

Therefore, the acoustic signal is transmitted to the two input terminals 13a and 13b provided on the rear panel 1B of the speaker box 1.
The same acoustic signal is supplied to the terminals 15a and 15b via the connection lines 14a and 14b.

The speaker box 1 has a rear plate 1 on the rear side facing the speaker sound emission hole 2a formed in the baffle plate 2.
B, a bottomed cylindrical recess 25 is formed in the speaker box 1, and a through hole 27 is formed in the bottom 26, and the step 8 a of the frame 8 fits into the through hole 27.

The above-mentioned speaker box 1 is made of ABS resin or the like and has a small and light weight of about 1 to 3 liters.
When the diameter of the speaker 3 is considered to be 8 cmφ or less, an acoustic signal is supplied from the terminals 13a and 13b to the inner and outer voice coils 12a and 12b, and if the speaker 3 is driven, the sound signal is supplied to the first diaphragm 10a. , A driving force F ₁ = M ₁ · α ₁ and a reaction force −F ₁ = M ₁ · α ₁ in the F ₁ direction act.

On the other hand, since the magnetic circuit of the second diaphragm 10b is configured to move in a direction opposite to the driving direction F1 of the _first diaphragm 10a, the second diaphragm 10b is connected to the rear plate 1B.
Driven in the direction. Now, assuming that the equivalent mass of the second speaker 10b is M ₂ and the acceleration is α ₂ , the driving force F _{2 in the} F ₂ direction is
= M ₂ · α ₂ and reaction force -F ₂ = M ₂ · α ₂ .

In this case, the rear surface of the first diaphragm 10a and the front surface of the second diaphragm 10b communicate with a space in the speaker box 1 through an opening 21 formed in the frame 8 of the speaker 3, and The rear surface of the diaphragm 10b communicates with the same recess 25 as the outside air through an opening 22 formed in the frame 8.

Therefore, the concave portion 25 of the yoke 6 of the speaker 3
In this case, the air radiated from the opening 22 to the periphery of the recess 25 causes the radiation force of the air of F _D3 = M _D3 · α _D3 and the reaction force −F _D3 = M _D3 · α _D3 to act. still,
Here, M _D2 is the equivalent mass of air in the concave portion 25, and α _D3 is the acceleration when the air in the concave portion 25 is radiated by driving the second diaphragm 10b.

Therefore, in the configuration of FIG. 2, the first diaphragm 10
and that can be mutually to cancel the reaction force -F ₂ sound radiation force F ₂ which reaction force -F ₁ sound radiation force F ₁ generated by a to occur in the second diaphragm 10b, lightweight small speaker box In order not to swing 1, if the balance is made so that F ₁ ≒ F ₂ + F _D3 , the reaction forces −F ₁ and −F ₂ can be obtained by using the two speakers 3 and 3b as described with reference to FIG. offset can be canceled out reaction forces -F ₂ of the first and reaction forces -F ₁ diaphragm 10a second diaphragm 10b as well as to.

In the case of FIG. 2, the first duct 18 and the second duct 18b are used to
Duct radiation force of 8a F _D1 (or -F _D1) duct emittance opening 18c of the second duct 18b to F _D2 {or -F
Because the _D2} are each other supported by canceling each other by an F _D1 ≒ F _D2, as a condition for not swinging the speaker box 1 that it is sufficient to satisfy F ₁ ≒ F ₂ + F _D3 described above become.

Further, in the configuration of FIG. 2, the rear plate (or right plate) 1 is opened from the opening of the recess 25 by the second diaphragm 10b.
B and the first diaphragm 10a increase the sound pressure in the low frequency region approximately twice by the baffle plate (or the left side plate) 2 and emit the sound, so that the sound pressure in the low frequency region can be enhanced. .

FIG. 3 shows another embodiment of the speaker device of the present invention. The speaker box 1 has exactly the same structure as that of FIG. 5, and the speaker 3 disposed in the speaker box 1 is improved. This is the case where the magnetic shield type is used.

That is, in the speaker 3 shown in FIG. 3, the direction of magnetization of the first magnet 4a is set to S and N having polarities opposite to the direction of magnetization of the second magnet 4b, and the inner voice coil 12a is opposite to the outer voice coil 12b. The first and second diaphragms 10a and 10b are driven in opposite directions to each other, and the outer periphery of the upper plate 5b is formed into a substantially cup-shaped metal shield case 28. It is surrounded so as to be in contact with the circumference. Furthermore, since the tinsel wires 16a and 16b having the same configuration as that described with reference to FIG. 1 are used, an acoustic signal is supplied to the terminal 15 via one input terminal 13a and the connection line 14a.

Even in the speaker device having the structure shown in FIG. 3, by setting the condition of F ₁ ≒ F ₂ , the reaction force −F ₁ of the _first diaphragm 10a of the speaker 3 can be reduced by the second diaphragm 10b. offset by counteracting force -F ₂ or attenuates, the first resulting capable serves is a magnet 4a cancellations magnet and the driven magnet making it possible to obtain a speaker and a speaker apparatus lowpass is enhanced without swinging Can be

[0052]

According to the loudspeaker and the loudspeaker apparatus of the present invention, a loudspeaker having a double structure is used, and a drive coil is disposed so as to move these two diaphragms in opposite directions. It is small and can be put together, and the reaction force of the acting force at the time of driving the two diaphragms can be canceled or attenuated mutually, and the vibration of the small and lightweight speaker device can be suppressed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a speaker of the present invention.

FIG. 2 is a side sectional view of the speaker device of the present invention.

FIG. 3 is a side sectional view of another speaker of the present invention.

FIG. 4 is a cross-sectional view of a conventional speaker device and an electric equivalent circuit diagram thereof.

FIG. 5 is another side sectional view showing the configuration of a conventional speaker device.

[Explanation of symbols]

1 speaker box, 3, 3b speaker, 10
a, 10b {first and second diaphragms, 12a, 12b
{Inner and outer voice coil, 21,22} aperture

Claims (5)

[Claims] A first driving coil for driving a first diaphragm; a second driving coil for driving a second diaphragm arranged in parallel behind the first diaphragm; A speaker provided with an opening formed between the first and second diaphragms, wherein the first and second drive coils are driven in mutually opposite directions. 2. The loudspeaker according to claim 1, wherein the opening is a heat radiating hole formed in a frame. 3. The speaker according to claim 1, wherein the first and second drive coils are driven in parallel through one input terminal. 4. An opening provided between said diaphragms of a speaker having a double diaphragm communicates with the volume of a speaker box, and the directions of movement of said double diaphragms are made opposite to each other, so that the sound of one of said diaphragms is turned off. A speaker device characterized in that a sound radiation force in a direction opposite to the radiation force is emitted from the other diaphragm. 5. The speaker device according to claim 4, wherein a speaker sound emission opening is formed in a rear panel opposite to the speaker disposed opposite to a speaker mounting hole formed in a front panel of the speaker box. .