JP2000059879A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge sound power of a speaker and to suppress vibration of a speaker box by disposing a movable body of a foamable synthetic resin or rubber and a vibrator composed of a weight to a speaker or a speaker box. SOLUTION: A vibrator 26 is joined to a bottom part of a yoke 3 composing a magnetic circuit by way of an adhesive material. A movable body 27 of a foamable synthetic resin, a rubber or the like molded in an almost cylindrical shape is joined to a rear side of the yoke 3 by way of the adhesive material so that the vibrator 26 faces the center pole 3a of the yoke 3. Also, a weight 28 consisting of a cylindrical-shaped non-magnetic material and the like is joined to a top part of the movable part 27 by way of the adhesive material, to constitute the vibrator 26 which gives an equivalent mass M2 and an acceleration α2. In this case, the movable body 27 is selected so that a specified stiffness (nature of spring) is added so as to constitute the vibrator 26. Thus, reactive force-F1 against the sound power F1 of a vibration plate 7 and reactive force F2 of the vibrator 26 acting on the movable body 27 and the weight 28 are mutually offset or attenuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suitable speaker device in which a speaker is built in a small and lightweight speaker box, and in particular, a vibrator is arranged in the speaker or the speaker box, and a reaction force of the sound radiation force of the speaker diaphragm. The present invention relates to a speaker device configured to cancel or attenuate the sound.

[0002]

2. Description of the Related Art Conventionally, in order to suppress vibration of a baffle board of a speaker box in which a speaker is mounted, a vibrator or a vibrator that vibrates in a direction opposite to a vibration direction of a speaker vibrated by a diaphragm. A speaker device having a transducer is disclosed in, for example, Japanese Patent Application Laid-Open No. 63-2120.
No. 00, JP-A-1-307398 and the like are known in detail.

The above-mentioned Japanese Patent Application Laid-Open No. 62-212000 discloses a speaker device as shown in FIG. FIG.
Numeral 5 designates a ring-shaped magnet 1 and numerals 2 and 3 designate a plate and a yoke which are mounted so as to sandwich the magnet 1 and have a magnetic gap 4 formed in a part thereof. The frame 5 of the speaker A is attached to the plate 2, and an edge 6 is provided on an outer peripheral portion of the diaphragm 7. The outer peripheral portion of the cone-shaped diaphragm 7 is held by the frame 5 by the edge 6. I have.

On the other hand, a voice coil bobbin 8 is attached to the inner peripheral portion of the diaphragm 7, and the voice coil bobbin 8
Is wound with a voice coil 9, which is inserted into a magnetic gap 4 formed by the plate 2 and the yoke 3. The configurations indicated by the reference numerals 1 to 9 are the basic structure of the well-known electrodynamic speaker A.

One end of a screw 10 is screwed into the center of the rear surface of the yoke 3 of the speaker A, and the other end of the screw 10 has exactly the same structure as the magnet 1, plate 2 and yoke 3 of the speaker A described above. Magnet 1
1, a magnetic circuit comprising a plate 12 and a yoke 13 is mounted.

[0006] A frame 14 is mounted on the plate 12, and two dampers 15, 16 are mounted on the frame 14.
The drive coil bobbin 17 is held by 5 and 16.

[0007] A drive coil 18 is wound around one end of the drive coil bobbin 17, and the drive coil 18 is inserted into a magnetic gap 19 formed by the plate 12 and the yoke 13. A weight 20 is attached to the other end of the drive coil bobbin 17.
The vibration system including 0 is substantially equal to the equivalent mass of the vibration system including the cone-shaped diaphragm 7 in the speaker A. The configuration indicated by the reference numerals 11 to 20 indicates the electric / vibration transducer B.

In the above configuration, the speaker A and the electric
The vibration transducer B is mounted on a baffle board 22 of the speaker box 21. Now, the voice coil 9 by a known action if energizing electrical signal to the voice coil 9 of the speaker A is produced driving force F ₁ vibrates in the horizontal direction in the figure, the sound reproduction by driving the diaphragm 7 of the cone type Do.

At this time, when the same electric signal is applied to the drive coil 18 of the electric / vibration transducer B, the drive coil 18 also vibrates in the left-right direction in FIG.
₂ to drive the weight 20 in the same direction. Here, if the equivalent mass of the vibration system including the diaphragm 7 and the like in the speaker A and the vibration system including the weight 20 and the like in the electric / vibration transducer B are substantially equal, the reaction force −F _{1 received} by the speaker A by the vibration system is equal to the electric force. · a reaction force -F ₂ of the vibration system of the vibration transducer B are substantially equal.

Therefore, the reaction of the speaker A due to the driving of the diaphragm 7 is canceled by the electric / vibration transducer B, so that the vibration of the baffle board 22 of the speaker box 21 and the swing of the speaker box 21 are suppressed.

Further, in the above-mentioned Japanese Patent Application Laid-Open No. 1-307398, the reaction force -F ₁ generated by the acting force F ₁ of the diaphragm of the first speaker with the cone openings of the diaphragms of the two speakers facing in opposite directions. also discloses a speaker device for canceling the counteraction force -F ₂ acting force F ₂ of the diaphragm of the second speaker.

[0012]

In the above-described speaker device of the conventional configuration, there is a demand to reduce the volume of the speaker box 21 so as to reduce the size and obtain an inexpensive speaker device. Is reduced, the low-frequency reproduction limit is increased, and the amplitude of the speaker is increased.

However, by increasing the amplitude of a small loudspeaker, the sound pressure in the loudspeaker box 21 increases, and peaks and valleys occur in the frequency characteristics. As a method of solving such a problem, a speaker device that uses a phase-inversion type speaker box to effectively utilize sound waves emitted from the back surface of the diaphragm to radiate a low-frequency range without distortion has been widely used. I have.

In order to incorporate the speaker shown in FIG. 15 into the above-mentioned small-sized phase-inversion type speaker box 21, a pair of speakers A having substantially the same structure and an electric vibration transducer B or JP-A-1-307398 are disclosed. A pair of speakers must be arranged back to back, and the depth direction of the speaker box becomes large, which makes it difficult to reduce the size of the speaker box and increases the cost.

An object of the present invention is to provide a speaker device which solves the above-mentioned problems, and a problem to be solved by the present invention is to use a single speaker and obtain a minimum resonance frequency f ₀ of a small speaker and a speaker. A speaker that can increase the resonance sharpness Q without changing the volume of the box, increase the sound radiation action force of a small speaker, expand low-frequency sound pressure and radiate low-frequency sound, and prevent swinging of a lightweight speaker box. To get the device.

[0016]

According to the present invention, a speaker or speaker box is provided with a vibrating body composed of a movable body such as a foamable synthetic resin or rubber and a weight in a speaker or a speaker box.

According to the speaker device of the present invention, the size of the speaker device can be reduced, and the electro-acoustic conversion efficiency can be improved.
One speaker and one vibrator can cancel or attenuate the reaction force of the sound radiation force of the speaker diaphragm, reduce the depth between the baffle board and the back plate of the speaker box and reduce the size, and the vibrator can also with time An inexpensive configuration without change can be achieved.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a speaker device according to the present invention.
An embodiment will be described with reference to FIGS. Note that FIG.
Corresponding parts to the speaker device indicated by are denoted by the same reference numerals.

FIG. 1 is a side sectional view of the speaker device of this embodiment, showing a case where a speaker A similar to that shown in FIG. 15 is disposed in a speaker box 21 having a phase inversion type duct 23. The speaker box 21 has the same configuration as that of FIG.

In the speaker device shown in FIG. 1, the speaker box 21 is formed of an ABS resin or the like into a substantially rectangular parallelepiped shape.
A speaker A similar to the one described in detail in FIG. 15 is fixed opposite to a speaker sound emission hole 22a formed in the baffle plate 22.

A baffle board 22 is provided below the speaker A.
And has a duct 23 having an opening 23a.

The speaker A is a small speaker of the present embodiment as a whole, and the yoke 3 is a disc-shaped portion made of a plate material such as pure iron and a column-shaped center pole 3a erected at the center of the disc-shaped portion. And a magnet guide 3b composed of a step formed in a disc-shaped portion concentrically with the center pole 3a.

A ring-shaped driving magnet 1 magnetized in the thickness direction of ferrite or the like is bonded on the disc-shaped portion of the yoke 3 via an adhesive. The inner diameter of the ring-shaped driving magnet 1 is fitted and positioned in a step portion of a magnet guide 3 b formed in a disk-shaped portion of the yoke 3.

The plate 2 is joined to the driving magnet 1. In this case, the gap guide should be center pole 3
a while keeping it inserted in a.
An adhesive is applied to the upper surface of the gap guide, and the inner diameter of the plate 2 is inserted into the outer diameter of the gap guide to be bonded and fixed. The plate 2 is made of a disc made of pure iron or the like, and is made of a punched plate having a through hole formed in the center. The voice coil bobbin 9 is formed in a magnetic gap 4 formed between the inner peripheral edge of the through hole and the outer diameter of the center pole 3a. And a voice coil 8 are provided.

A metal part of a magnetic circuit is formed on the plate 2 by fixing a frame 5 formed in a funnel shape with a steel material or the like.

A voice coil 8 wound around a cylindrical voice coil bobbin 9 is inserted into the magnetic gap 4 of the above-described magnetic circuit, and a breathable damper 18 having a corrugation having a corrugated waveform so as to swing vertically. The voice coil bobbin 9 is held therethrough.

The inner diameter of the damper 18 is joined to the upper end of the voice coil bobbin 9 via an adhesive, and the outer diameter is joined to the outer periphery of the bottom surface of the frame 5. Further, the inner diameter of a funnel-shaped diaphragm 7 having a free or fixed edge 6 made of paper or the like is joined to the upper outer diameter portion of the voice coil bobbin 9, and the largest diameter portion of the diaphragm 7 is joined to the peripheral edge of the upper opening of the frame 5. Is fixed through a gasket 25.

Further, in the present invention, the vibrating body 26 is bonded to the bottom of the yoke 3 constituting the magnetic circuit via an adhesive.

The vibrating body 26 shown in FIG. 1 has a movable body (elastic body) 27 such as a foamable synthetic resin or rubber molded in a substantially cylindrical shape, and is provided with a movable body 27 of the yoke 3 so as to face the center pole 3a of the yoke 3. Join to the back via adhesive.

Further, a weight 28 made of, for example, a columnar non-magnetic material is bonded to the top of the movable body 27 via an adhesive, and a vibrating body 26 to which an equivalent mass M ₂ and an acceleration α ₂ are given.
Are configured. In this case, the movable body 27 is selected so as to provide a predetermined stiffness (springiness) to constitute the vibrating body 26.

Since the voice coil 8 of the speaker A shown in FIG. 1 is connected to the input terminal 29 via the tinsel wire 30, by supplying an acoustic signal to the input terminal 29, the diaphragm 7 is moved, for example, by an arrow F _1. Is driven in the direction shown by F ₁ = M _1.
The sound radiation force of α ₁ acts (here, M ₁ is the equivalent mass of the vibration system of speaker A, and α ₁ is the acceleration acting on diaphragm 7 of speaker A). reaction force -F ₁ acts.

In the present invention, the vibrating body 26 is fixed to the yoke 3 constituting the magnetic circuit of the speaker A, and constitutes a fixed portion with respect to the vibration system of the speaker A. Accordingly, the sound radiation force F ₁ of the diaphragm 7 in the F ₁ direction is F ₁ = M ₁ · α _{1 and the} direction F ₂ = M ₂ · α in the opposite direction
₂ (where M ₂ is the equivalent mass of the vibrating body 26, α ₂ is the acceleration acting on the vibrating body 26 including the movable body 27 and the weight 28), and the reaction force indicated by an arrow on the vibrating body 26 −
F ₂ will be to work.

The acting force F _{2 in the} opposite direction can be considered as the acting force excited by the reaction force −F ₁ of the acting force F ₁ of the diaphragm 7.

[0034] Therefore, the reaction force -F ₂ against the acting force F ₂ acting on the movable member 27 and the weight 28 of the reaction force -F ₁ and the vibrating member 26 with respect to sounds emitted force F ₁ of the diaphragm 7 F ₁
= M ₁ · α ₁ ≒ F ₂ = M ₂ · α ₂ makes it possible to cancel or attenuate each other.

In the configuration of FIG. 1, the speaker box 21 is of a phase inversion type, and has the duct 23, so that the sound radiation force F _D1 of the opening 23a of the duct F _D1 = M _D1 · α _D1 (where M _D1 is the equivalent of the duct) The mass, α _D1 is the acceleration at which the air in the duct moves.) The balance equation for the vibrating body 26 to cancel or attenuate the reaction force −F ₁ of the diaphragm 7 to generate the following equation is F ₁ + F _D1 ≒. F ₂ and may be set. This equation is given by M ₁ · α ₁ + M _D1 · α _D1 ≒ M ₂ · α ₂ where the area of the diaphragm 7 of the speaker is S, and the sectional area of the duct 23 is S _D1 . Then from now on, As (1) easily determined it is possible equivalent mass M ₂ of the weight 28 of the vibrator 26 from the equation.

That is, in the present invention, the reaction force -F ₁ generated by the diaphragm 7 only by fixing the simple vibrator 26 to the magnetic circuit.
Can be eliminated.

FIG. 2 is a side sectional view showing another embodiment of the speaker device according to the present invention, and the same reference numerals are given to portions corresponding to those in FIG.

FIG. 2 shows still another embodiment of the speaker device for achieving the same object as that of FIG. 1. FIG. 2 shows a vibration member 26 similar to that described with reference to FIG. It is bonded to the shielding case 36 of the provided magnetic circuit via an adhesive.

In the case of FIG. 2, the structure of the vibrating body 26 is the same as that of FIG. 1, and the corresponding parts are indicated by the same reference numerals. Only the differences between the speaker A and FIG. 1 will be described below.

First, the damper 18 of the speaker A of this embodiment is made airtight by impregnating the surface of a damper such as a cloth with a resin solution to make the damper 18 airtight, and the first space below the damper 18 (between the damper 18 and the plate 2). And the space between the outer diameter of the center pole 3a and the inner diameter of the magnet 1) 24a and the inner diameter of the cancel magnet 42 joined to the bottom of the yoke 3 via an adhesive, the bottom of the yoke 3, and the bottom of the shield case 43. The second space 24b surrounded by a circle is communicated through a through hole 44 formed in the yoke 3 to keep the inside of the first and second spaces 24a and 24b airtight. Try to give compliance.

The ring-shaped cancel magnet 42 joined to the lower side of the yoke 3 is magnetized so that the same polarity is opposed to the magnet 1, and a cylindrical portion of a cup-shaped shield case 43 is formed. The inner diameter and the outer circumference of the plate 2 are joined so as to have the same polarity.

In the configuration shown in FIG. 2, the sound radiation force F ₁ and the vibrating body 2
The acting force F reaction force -F ₁ and -F ₂ of each of _two 6 -
F ₁ ≒ -F ₂ and F ₃ for compression and expansion of air in an airtight space portion in the through hole 44 bored in the yoke 3 between the first and second space portions 24a and 24b together with the support each other by And the acting force indicated by −F ₃ is the diaphragm 7 of the speaker A.
The generated corresponding to the vibration direction, it is added to the sound radiation force F ₁ acting force F ₂ or the diaphragm 7 of the vibrating body 26, and more can increase the radiation power of the bass.

FIG. 3 shows still another embodiment of the present invention. In the magnetic circuit of the speaker A, the center pole 3
The vibrating body 26 is joined to the top of a through an adhesive or the like.

The movable body used in FIG. 3 is obtained by cutting a relatively thin movable body 27 such as a foamable synthetic resin or rubber having good air permeability into a circular shape, so that its outer diameter does not contact the inner diameter of the voice coil bobbin 9. selected, further, a weight 28 for imparting a predetermined equivalent mass M ₂ is comprised of non-magnetic member such as synthetic resin or aluminum. Therefore, these vibrators 26 are disposed in the voice coil bobbin 9.

Further, the phase inversion type duct 23 has a second duct 23b having a diameter larger than that of the first duct 23 so as to partially overlap the first duct 23 in order to form a double duct. The rear panel 31 of the speaker box 21 is extended into the speaker box 21 and the second
With a predetermined distance between the opening 23c of the duct 23b and the inside of the baffle board 22,
3b is configured to be concentric in a vertical section.

Therefore, the sound radiation force F _D1 from the duct opening 23 a of the first duct 23 = the reaction force of M _D1 · α _D1 -F.
_D1 is the acting force F _D2 = M _D2 · α _D2 when air enters the opening 23c of the second duct 23b (where M _D2 is the second duct 23
The equivalent mass of b, α _D2, is the acceleration of the air moving in the second duct 23 b and is selected as M _D1 ≒ M _D2 , α _D1 ≒ α _D2 ), which cancels out or attenuates each other, and thus the speaker Box 2
Lightweight speaker box 21 if so as to cancel a reaction force -F ₁ at the time of driving of the speaker A will be possible to suppress the rocking of the time the speaker driving in the 1.

The case of FIG. 3, the vibrating body 26 a reaction force -F ₁ sound radiation force F ₁ of the speaker A as the excitation force F ₂
Receiving a direction of the drive force indicated by the counteracting force -F speaker 3 in reaction force -F ₂ in the F ₂ direction of the driving force of the vibrating body 26
₁ is canceled or attenuated, and the radiated sound is mutually canceled and attenuated between the first and second ducts 23 and 23b. Therefore, the balance equation of the speaker A can satisfy the condition of F ₁ ≒ F _2. It will be good.

FIGS. 4A to 4D show other mounting explanatory diagrams of the vibrating body used in the speaker device of the present invention described in detail in FIG.

4A to 4D are side sectional views of main parts of the speaker A, and FIG. 4E is a side sectional view of the whole speaker. In FIG. 4A, when the diaphragm 26 is joined to the top of the center pole constituting the magnetic circuit via an adhesive, a movable body 27 such as a foamed synthetic resin such as a cylinder or a prism having a permeability or rubber is placed on the lower side. , Disk or square non-magnetic material weight 2
8 is joined to the upper side of the movable body 27 such as a foaming synthetic resin or rubber, is disposed in the voice coil bobbin 9 and the cap 38, and a through hole 39 is formed at the top of the cap 39 so that the air in the voice coil bobbin 9 is removed. This is the case where the inflow is made easy and the oscillation of the vibrating body 26 is made large.

The vibrating body 26 having the structure shown in FIG. 4B has a through hole 40 penetrating from the top to the bottom at the center of the center pole 3a constituting the magnetic circuit, and the vibrating body 26 is fitted and fixed.
The vibrating body 26 is formed by inserting a weight 28 made of a columnar non-magnetic material at the center portion into a center hole of a movable body 27 made of a columnar foamable synthetic resin. This is a case where the through hole 39 is not formed in the cap 38.

In the embodiment shown in FIG. 4C, the diaphragm 26 is placed on the yoke 3 in the first space portion 24a formed between the outer diameter of the center pole 3a constituting the magnetic circuit and the inner diameter of the magnet 1.
A ring-shaped non-magnetic weight 28 is similarly placed on the movable body 27 with the ring-shaped rubber or foam movable body 27 facing down.
It is designed to be joined on top.

FIG. 4D shows a state in which a cylindrical movable member 27 such as rubber or foam is joined to the inner diameter of the magnet 1 in the first space portion 24a of the magnetic circuit, and a ring-shaped non-magnetic weight 28 is attached to the movable member 27. 4C and FIG. 4D, the vibrating body 26 is provided before the plate 2 is bonded on the magnet 1.

In the embodiment shown in FIG. 4E, for example, a gasket 25 for joining the outer periphery of the edge 6 of the fixed edge type diaphragm 7 to the maximum opening diameter of the frame 5 is attached to the vibrator 26.
This is a case where the function is also used.

Generally, a gasket (arrow paper) 25 is formed by joining the maximum outer peripheral portion of the edge 6 to the maximum opening diameter portion of the frame 5 with an adhesive or the like. Although fixed, in this example, a movable body (elastic body) formed in a ring shape instead of the gasket 25
The outermost periphery of the diaphragm 7 or the edge 6 is fixed on the frame 5 by a vibrating body 26 to which a 27 and a ring-shaped weight (in this case, a magnetic body may be used) 28 are joined.

Further, in FIG. 4E, one end (inner diameter) is joined to the voice coil bobbin 9 and the other end (outer diameter) is joined to the bottom of the frame 5 so that the outer diameter of the damper 18 is attached to the bottom of the frame 5. At the time of joining, the joining is performed via a vibrating body 26 ′ composed of a ring-shaped movable body 27 and a weight 28.

In the configuration shown in FIG. 4E, an example in which the vibrating plate 7 and the damper 18 are held by the vibrating bodies 26 and 26 'has been described, but these may be only one of the vibrating bodies 26 or 26'.

According to each configuration described above, considering the speaker A alone, the reaction force −F of the sound radiation force F ₁ of the speaker A is considered.
Speaker A that can be canceled or attenuated _one in reaction force -F ₂ acting force F ₂ of the vibrating body 26 is obtained.

FIGS. 5A to 5D are plan and side sectional views of a speaker used in a speaker device according to still another embodiment of the present invention.

The speaker A shown in FIGS. 5A and 5B has a vibrating body 2 in which a ring-shaped weight 28 is joined to a ring-shaped movable body 27 made of synthetic resin foam, for example, having a diameter of about 26φ.
6 is concentrically joined to the cap 38 above the diaphragm 7 via an adhesive.

Similarly, the speaker A shown in FIGS. 5C and 5D is obtained by cutting a movable body (elastic body) 27 such as a synthetic resin foam or rubber into a rectangular shape with a predetermined thickness, and cutting the movable body 27 from the center of the cap 38 of the diaphragm 7. For example, the vibrating body 26 in which the rectangular movable body 27 is aligned with the longitudinal direction of the rectangular movable body 27 in the radial direction of the diaphragm 7 within an angle range of 120 degrees and bonded with an adhesive, and the rectangular weight 28 is bonded on the movable body 27 Three are arranged.

FIGS. 6A to 6E are views for explaining a method of attaching various types of vibrators 26 disposed on the diaphragm 7. FIG.

FIG. 6A shows an adhesive 49 between the bottom of the movable body 27 made of a lightweight ring-shaped foamable synthetic resin and the inclined portion of the diaphragm 7.
And the movable body 27 is joined so that the height direction of the movable body 27 is erected perpendicularly to the vibration direction of the diaphragm 7 (Y-axis direction).
7, a ring-shaped weight 28 is joined to the vibrating body 26.
This is a case in which

In the case of FIG. 6B, a flat ring-shaped movable body 27 and a ring-shaped weight 2 along the radial direction of the diaphragm 7 are provided.
This is a case in which a vibrating body 26 made of 8 is joined to the vibrating plate 7.

FIG. 6C is a modification of FIG. 6B, and is an enlarged view of a portion A in FIG. 6B. In FIG. 6C, the movable body 27 of the vibrating body 26
In this case, a small hole 46 is drilled on the lower side where is joined. When the movable member 27 in this case is referred to as being breathable, it generates an action force F ₃ and its reaction force -F ₃ of air as a driving source of pressure fluctuations in the speaker box 21.

The pressure (normally 1 atm) when the diaphragm 7 of the speaker A disposed in the speaker box 21 is not moving is defined as P _B, and the volume in the speaker box 21 is defined as V _B.
And the surface area of the diaphragm 7 of the speaker A is S as described above.
Assuming that the amplitude is X, the following (2) is the driving pressure.

[0066] Here, -SX is + SX to the vibration plate 7 is outside (F ₁ direction) is the case where the diaphragm 7 is driven inward (-F ₁ direction).

Therefore, in the case of FIG. 6C, the reaction force for canceling out or attenuating -F ₁ can be -F ₂ + (-F ₃ ).

The embodiment shown in FIG. 6D uses an elastic member having the same structure as the damper 18 of the speaker A or the like as the movable body 27. The movable body 27 is formed in a ring shape or a cylindrical bellows as shown in FIG. 6D. Ring-shaped weight 2
The vibrating body 26 may be formed by integrally molding the movable body 8 and these movable bodies 27 with, for example, synthetic resin or the like.

FIGS. 5A to 5D and FIGS. 6A to 6 described above.
Speaker A movable member 27 in the configuration of the D as foam or lightweight synthetic resin, and it is selected to be about 1/10 of the equivalent mass of the vibration plate 7, equivalent mass M ₂ of the vibrating body 26 is vibrating plate Since the direction of movement of the diaphragm 7 is opposite to that of the speaker A, it can be considered that it is hardly added to the equivalent mass of the vibration system of the speaker A, and unnecessary resonance of the diaphragm 7 can be prevented (for example, a node of the second resonance mode). The vibrating body 26 is stuck on the like), so that the sound quality can be improved.

FIG. 6E shows a case in which the vibrating body 26 is joined between the outer diameters of the diaphragm 7 and the voice coil bobbin 9. The movable body 27 is formed in a ring shape, is joined to the outer diameter of the voice coil bobbin 9 via an adhesive, and
7 is also joined to the diaphragm 7 via an adhesive 49 between the bottom surface of the diaphragm 7 and the inclined portion of the diaphragm 7.

In such a configuration, since the voice coil bobbin 9 must protrude upward from the center hole of the diaphragm 7 long, the equivalent mass M ₁ of the vibration system increases, and as shown in FIG. In order to increase the driving force, a second ring-shaped magnet 47 and a second
Is provided to increase the magnetic flux density in the magnetic air gap 4. Also in this configuration, the reaction of the diaphragm 7 at a reaction force -F ₂ acting force F ₂ of the vibrating body 26 driven by the reaction force -F ₁ acting force F ₁ at the time of sound emission of the speaker diaphragm 7 force -F ₁ is canceled or can attenuate the movable body 27 which is constituted by foam also occurs effect to cut high frequency.

FIGS. 7A to 7C show other structures for explaining the vibrating body used in the speaker device of the present invention. In each of these structures, the vibrating body 26 is provided inside or outside the voice coil bobbin 9. Attached to.

In the speaker A of FIG. 7A, the voice coil bobbin 9 is extended longer than the center hole of the diaphragm 7 in the same manner as in FIG. 5E, and a ring-shaped foam synthetic resin is fitted to the outer diameter of the voice coil bobbin 9 above. The movable body 27 is bonded via an adhesive, the weight 28a also serving as a reflector is formed in a substantially cap shape, and the cap-shaped opening is joined to the outer diameter of the movable body 27. .

FIG. 7B has a cap 38 at the top of the voice coil bobbin 9 like a normal speaker, and a lower part of the cap 38 via a movable body 27 made of an elastic member such as a rubber ring. In this case, the vibrating body 26 to which a ring-shaped non-magnetic weight 28 is bonded is bonded.

FIG. 7C shows a disk-shaped weight 28 on a substantially disk-shaped movable body 27 made of, for example, foamed synthetic resin.
In this case, the vibrating body 26 to which is bonded the inside of the upper end of the voice coil bobbin 9 via an adhesive, and the cap 38 is bonded to the outer diameter of the voice coil bobbin 9.

[0076] reaction forces of the vibrating body 26 a reaction force -F ₁ speaker even in a configuration of FIG. 7A to 7C described above -F
_In the configuration of FIG. 7C, the cavity resonance in the voice coil bobbin 9 can be attenuated by the movable body 27 to obtain an effect useful for improving sound quality.

FIG. 8 shows that the configurations of the speaker A and the speaker box 21 are exactly the same as those of FIG. 1, and the vibrating body 26 is also composed of a movable body 27 such as rubber or foam synthetic resin and a weight 28. Vibrator 2 with stiffness
By 6, the rocking back and forth direction of the speaker box 21 in reaction -F ₂ of the driving force F ₂ when excited reaction forces -F ₁ to the action force F ₁ of the diaphragm 7 of the speaker A as a drive source To prevent this, the vibrating body 26 is fixed to the back plate 31 of the speaker box 21 with the movable body 27 down with an adhesive or the like.

The vibrating member 26 is located at the center position of the yoke 3 of the speaker A (the center position of the center pole 3a).
6 are arranged so as to face the magnetic circuit of the speaker A so that the centers of the speakers 6 are aligned.

FIGS. 9 and 10 are side sectional views of still another speaker device of the present embodiment. In these cases, the vibrating body 26 is joined to the outside of the back plate 31 of the speaker box 21. is there. 9 and 10, the structures of the speaker A and the speaker box 21 are the same small speaker and small-capacity speaker box as those of FIG.

In the case of FIG. 9, the vibrating body 26 is joined to the outside of the back plate 31 at a position facing the magnetic circuit of the speaker. The structure of the vibrating body 26 is exactly the same as that of FIG.

In the configuration shown in FIG. 10, the vibrating body 26 is attached to the outside of the back plate 31 facing the magnetic circuit of the speaker A.
The structure of the vibrating body 26 is such that a movable body 27 such as an expandable synthetic resin is formed in a ring shape, and a weight 28 such as a substantially disc-shaped synthetic resin board or an aluminum board covers a hollow portion having an inner diameter of the movable body 27. Are bonded via an adhesive.

[0082] Also when in the configuration of FIG. 9 and FIG. 10 described above, the reaction force -F ₂ acting force F ₂ generated by the vibrating body 26 a reaction force -F ₁ acting force F ₁ of the speaker A as an excitation force
In cancellation or attenuation capable speaker device counteracting force -F ₁ speaker A is obtained.

[0083] The speaker box 21 in the configuration of FIG. 9 and FIG. 10 to 630cc and size and weight, as 57mmφ the diameter of the speaker A, the weight of the vibrating body 26 in Fig. 9 without changing the minimum resonance frequency f ₀ of the speaker A FIGS. 11 and 12 show a sound pressure level-frequency characteristic curve and an impedance-frequency characteristic curve when 28 is changed.

FIG. 11 shows that the sound pressure level-frequency characteristic when the equivalent mass of the weight 28 of the vibrating body 26 is 5.3 g is as shown by a curve 32, and the resonance sharpness Q = at the lowest resonance frequency f ₀ = 166 Hz. 1.52. In FIG. 11, a portion 34 of the impedance-frequency characteristic curve 33 is a resonance portion of the speaker A, and a portion 35 is a resonance portion of the duct 23. Due to these influences, the resonance peak position 36 of the lowest resonance frequency f ₀ of the speaker A and the bass reflex effect. , The resonance peak position 37 of the duct 23 is shifted to the lower frequency side.

FIG. 12 shows a case in which the same mass of the weight 28 of the vibrating body 26 is reduced to 1.3 g using the same speaker A and vibrating body 26 as those in FIG. In this case, f ₀
The Q at 166 Hz was 1.53.

Normally, a speaker A having a diameter of 57 mmφ is 63
The value of Q at f ₀ = 166 Hz when housed and driven in the speaker box 21 having a capacity of ₀ cc is about 1.39, but in this example, only the vibrator 26 is added and the speaker A and the speaker box 21 are additionally provided. 1.39 without changing
From 1.52 to 1.53.

As described above, the Q of the speaker A is generally represented by the acting force F ₁ of the diaphragm 7 = M ₁ · α ₁ . Can be represented by Here W _E is the input voltage to the speaker A, Bg
Is the magnetic flux density of the magnetic air gap 4, Vv is the effective volume of the voice coil 8, and δ is the specific resistance of the material of the voice coil 8.

As can be seen from the above equation (3), the fact that Q can be increased is due to the difference between the speaker A and the speaker box 21.
The sound radiation force F in the low range of a small speaker without changing the characteristics of F
₁ = M ₁ · α ₁ is increased, which leads to an increase in sound radiation power.

FIG. 13 shows the vibrating body 26 having the structure shown in FIG.
Is externally attached to the speaker box 21 and the speaker A having the same structure as that shown in FIG. 9 is built therein, and the frequency characteristic curve when the equivalent mass of the weight 28 of the vibrating body 26 is 4.25 g is shown. The Q at ₀ = 166 Hz is 1.51
This is larger than the conventional 1.39.

In the above configuration, the case where the vibrating body 26 is fixed to the back plate 31 of the speaker box 21 has been described.
It is apparent that the same effect as described above can be obtained even if the baffle board 22 is attached to the inside or outside of the baffle board 22 as shown in FIG. since the board is not, in fact, a rigid counteraction force -F ₁ speaker a vibrator 2
6 is like cause an action force of F _2.

[0091]

According to the speaker device of the present invention, the reaction force of the sound radiation of the speaker is canceled or attenuated by the reaction force of a simple vibrator disposed on a diaphragm, a vibration system, a speaker box or the like of a magnetic circuit. And the speaker's sound radiation power can be made larger than usual, and the speaker's sound radiation reaction force can be supported by a structure that does not require a driving voice coil like an electric / vibration transducer. Can be obtained that can also suppress the fluctuation of

[Brief description of the drawings]

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

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

FIG. 3 is a side sectional view (I) of still another speaker of the present invention.

FIG. 4 is an explanatory view (I) of attaching a vibrating body used in the speaker device of the present invention.

FIG. 5 is a front and side sectional view of a speaker used in the speaker device of the present invention.

FIG. 6 is an explanatory view (II) of attaching a vibrating body used in the speaker device of the present invention.

FIG. 7 is an explanatory view (III) of attaching a vibrating body used in the speaker device of the present invention.

FIG. 8 is a side sectional view (I) of still another speaker device of the present invention.
I).

FIG. 9 is a side sectional view (II) of still another speaker device of the present invention.
I).

FIG. 10 is a side sectional view (IV) of still another speaker device of the present invention.

FIG. 11 is a diagram (I) of a sound pressure level-frequency and impedance-frequency characteristic curve of the present invention.

FIG. 12 is a sound pressure level-frequency and impedance-frequency characteristic curve diagram (II) of the present invention.

FIG. 13 is a sound pressure level-frequency and impedance-frequency characteristic curve diagram (III) of the present invention.

FIG. 14 is a side sectional view (V) of still another speaker device of the present invention.

FIG. 15 is a partial sectional view of a conventional speaker device.

[Explanation of symbols]

A ‥‥ Speaker, B ‥‥ Electric / vibration transducer,
7 ‥‥ diaphragm, 20, 28 、 weight, 26 ‥‥ vibrator, 27 ‥‥ expandable synthetic resin movable body

Claims (8)

[Claims] 1. A speaker device comprising a speaker or a speaker box provided with a movable body made of foamable synthetic resin or rubber and a vibrating body composed of a weight. 2. The speaker device according to claim 1, wherein the vibrating body is provided on a back surface of a magnetic circuit constituting the speaker. 3. The speaker according to claim 1, wherein the vibrator is disposed on a center pole of a magnetic circuit constituting the speaker or in a through hole formed in the center pole. Speaker device. 4. The vibrator is arranged at a predetermined position in a space surrounded by an outer diameter of a center pole and an inner diameter of a magnet of a magnetic circuit constituting the speaker. The speaker device according to any one of claims 3 to 7. 5. The speaker device according to claim 1, wherein the vibrating body is provided on a diaphragm constituting the speaker. 6. The voice coil bobbin constituting the speaker, wherein the vibrating body is disposed within an outer diameter or an inner diameter of the voice coil bobbin.
Item 7. The speaker device according to Item 1. 7. The vibrating body according to claim 1, wherein a gasket for holding an outer periphery of a diaphragm and / or a damper constituting the speaker on a frame is formed as the vibrating body.
The speaker device according to claim 1. 8. The vibrating body according to claim 1, wherein the vibrating body is disposed inside a baffle board of the speaker box or inside or outside a back plate of the baffle board. The speaker device according to claim 1.