JP2000032592A - Loudspeaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a reactive force of sound emission to be offset or attenuated by an active force of an oscillation plate and a vibration body by having the oscillation plate, where the active force in a reactive force direction acts upon a sound emission direction of the oscillation plate supported in cantilever by the oscillation plate of an oscillation system or a damper. SOLUTION: An oscillation body 26 is constituted and it integrally molds a ring shaped weight 30, which gives a specified equal quantity M2 molded by a synthetic resin or the like and an almost ring-shaped movable object 32 for giving a specified compliance (property a spring), to which corrugation of a similar structure to a damper used for a normal speaker is applied in a wave pattern or so that the movable object 32 molded by a cloth is adhered to the inside diameter of the ring shaped weight 30 and integrated. The inner diameter part of the movable object 32 is provided with an overlap width 32b, having a specified tilt in accordance to a tilt angle of an installment position of a vibration plate 7, the overlap width 32b of the oscillation body 26 is inserted in a lower side of the vibration plate 7 and is bonded so that it is supported in cantilever manner via an adhesive material.

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 simple vibrator is arranged in a vibration system of the speaker, and a sound radiation force of a diaphragm of the speaker is provided. The present invention relates to a speaker device configured to cancel or attenuate the reaction force of the speaker device.

[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. 63-212000 discloses a speaker device as shown in FIG. In FIG. 5, reference numeral 1 denotes a ring-shaped magnet, and reference numerals 2 and 3 denote a plate and a yoke which are attached so as to sandwich the magnet 1 and partially have a magnetic gap 4 formed therein. 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, and the outer peripheral portion of the cone-shaped diaphragm 7 is held by the frame 7 by the edge 6.

On the other hand, a voice coil bobbin 8 is mounted on the inner peripheral portion of the diaphragm 7, and a voice coil 9 is wound around the voice coil bobbin 8. The voice coil 9 is formed by a magnetic air gap formed by the plate 2 and the yoke 3. 4 is inserted. 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 the same magnets 1, 2 and 3 as those of the speaker A described above. A magnetic circuit consisting of 11, a plate 12, and a yoke 13 is mounted.

Further, a frame 14 is mounted on the plate 12, and two dampers 15, 1 are mounted on the frame 14.
The drive coil bobbin 17 is held by the dampers 15 and 16.

A drive coil 18 is wound around one end of the drive coil bobbin 17, and the drive coil 18
2 and a yoke 13 are inserted into a magnetic gap 19. A weight 20 is attached to the other end of the drive coil bobbin 17, and the vibration system including the weight 20 is substantially equal to the equivalent mass of the vibration system including the cone-shaped diaphragm 7 in the speaker A. ing.
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 conventional speaker device, there is a demand to reduce the volume of the speaker box 21 and reduce the size of the speaker box 21 to obtain an inexpensive speaker device. When the volume is reduced, the low-frequency reproduction limit is increased, so that the amplitude of the speaker A is increased.

However, by increasing the amplitude of the small speaker A, the sound pressure in the speaker box 21 increases, and peaks and valleys occur in the frequency characteristics. As a solution to such a problem,
A speaker device that uses a phase-inversion type speaker box 21 to effectively utilize sound waves emitted from the back surface of the diaphragm 7 to radiate a low-frequency range without distortion has been widely used.

In order to incorporate the speaker A shown in FIG. 5 into the above-mentioned compact 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. In addition, a pair of speakers must be arranged back to back, and the depth direction of the speaker box 21 becomes large, which makes it difficult to reduce the size of the speaker box 21 and increases the cost.

Further, the vibration system of the speaker was made equal.
In one speaker, the higher the lowest resonance frequency f ₀ of the vibrating system, the higher the resonance sharpness Q increases in proportion to f ₀ , and thus 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. The problem to be solved by the present invention is to use one speaker A and to use f _{0 of the} speaker A.
Is shifted to the low-frequency side to obtain a speaker device capable of expanding the low frequency range and emitting high-quality low-frequency radiation and preventing the swing of the lightweight speaker box 21.

[0017]

A speaker device according to the present invention is a speaker having a vibration system including a diaphragm which allows a voice coil wound around a voice coil bobbin to swing through a damper in a magnetic gap of a magnetic circuit. Further, a vibrating body on which a acting force acting in a reaction direction with respect to the sound radiation direction of the diaphragm acts on the diaphragm or the damper cantileveredly.

In the speaker device of the present invention, a speaker in which a vibrating body in which a force acting in a reaction direction to a sound radiation direction of the diaphragm acts on a diaphragm or a damper is mounted in a small speaker box, the speaker box swings. Can be suppressed.

According to the loudspeaker device of the present invention, the size of the loudspeaker is reduced, the electric-to-acoustic conversion efficiency is improved, and the reaction force of the sound radiation force of the diaphragm is canceled out by one loudspeaker and one vibrator. It is possible to obtain a device that can be attenuated and can be reduced in size by reducing the depth between the baffle board and back plate of the speaker box.

[0020]

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. The parts corresponding to those of the speaker device shown in FIG. 5 are denoted by the same reference numerals.

FIG. 1A is a side sectional view of the speaker of the present embodiment, A shows a small speaker of the present embodiment as a whole, and a yoke 3 has a disk-shaped portion made of a plate material such as pure iron and the like. A cylindrical center pole 3a erected at the center position
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 drive magnet 1 is fitted and positioned in a step portion of a magnet guide portion 3b formed in a disk-shaped portion of the yoke 3.

The plate 2 is placed on the driving magnet 1.
To join. In this case, the gap guide is left inserted in the center pole 3a, the adhesive is applied to the upper surface of the driving magnet 1, and the inner diameter of the plate 2 is inserted and fixed to the outer diameter of the gap guide. The plate 2 is made of a pure iron or the like in a disk shape, and is a punched plate material having a through hole formed in the center thereof. The voice coil bobbin 8 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. Is arranged.

A metal part of the 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 9 wound around a cylindrical voice coil bobbin 8 is inserted into the magnetic gap 4 of the above-described magnetic circuit, and a breathable damper 23 having a corrugation having a corrugated waveform so as to swing vertically. The voice coil bobbin 8 is held therethrough.

The inner diameter of the damper 23 is joined to the outer diameter of the voice coil bobbin 8 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 the funnel-shaped diaphragm 7 having a free or fixed edge 6 made of paper or the like which is previously disposed below (backside) the diaphragm 7 so as to support a vibrating body 26 described later in a cantilever manner is determined by voice. The upper end of the coil bobbin 8 is joined to the outer diameter portion, and the maximum diameter portion of the diaphragm 7 is fixed to the peripheral edge of the upper opening of the frame 5 via the gasket 25. 37 is a kinshi wire, and 36 is an input terminal.

As shown in FIG. 3A, the vibrating body 26 is formed by molding a ring-shaped weight 30 formed of a synthetic resin or the like to give a predetermined equivalent mass M ₂ and a corrugation having the same structure as a damper used for a normal speaker. Or a substantially ring-shaped movable body 32 giving a predetermined compliance (spring property) to the weight 30, or affixing the movable body 32 molded with cloth or the like to the inner diameter of the ring-shaped weight 30. It is made to be worn and integrated.

The inner diameter portion 32a of the movable body 32 has a margin 32 having a predetermined inclination according to the inclination angle of the mounting position of the diaphragm 7.
In FIG. 1A, the adhesive margin 32b of the vibrating body 26 is inserted below the diaphragm 7 and joined so as to be cantilevered via an adhesive.

FIG. 1B is a side sectional view of a main part in which the vibrating body 26 is mounted on the upper side (front side) of the vibrating plate 7 as well. In the case of FIG. 1B, the vibrating body 26 joined on the vibrating plate 7 is shown.
Has a weight 30, such as a ring-like synthetic resin which gives the equivalent mass M ₂ inside the predetermined movable member 32 to provide a predetermined compliance which ring-shaped waveform corrugation is performed as shown in FIG. 3B, the outer peripheral side A glue margin 32b corresponding to the inclination angle of the diaphragm 7 is integrally formed of synthetic resin or the like.

The above-mentioned vibrating body 26 is formed in a ring shape, but as shown in FIG. 3C, a vibrating body comprising a substantially rectangular parallelepiped weight 30, a rectangular movable body 32 for providing predetermined compliance, and a glue margin 32b. 1A or 1B, a predetermined distance from the center position of the cone-shaped diaphragm 7 on the front and / or the back of the diaphragm 7 of the speaker A, for example, at intervals of 120 degrees. The plate 7 may be joined so as to be substantially horizontal at a predetermined angle from the inclination angle of the plate 7.

FIG. 2 shows another embodiment of the speaker used in the speaker device of the present invention. The configuration of the speaker A used in FIG. 2 is exactly the same as the configuration in FIG. 1A, and in this example, the vibrating body 26 is joined to a damper 23 holding a vibration system.

The vibrating body 26 used in FIG. 2 is constituted, for example, as shown in the perspective view of FIG. 3D. That is, a weight 30 molded with a ring-shaped synthetic resin or the like, a corrugation of a waveform molded integrally with the weight 30, and a movable body 32 provided with a predetermined compliance,
The movable body 32 is composed of a cylindrical portion 32c which extends downward from the inner diameter portion 32a of the movable member 32 in a cylindrical shape, and a glue margin 32b which is expanded outward. After holding the voice coil bobbin 8 on the frame with the damper 23, such a vibrating body 26 inserts the cylindrical portion 32c along the outer periphery of the voice coil bobbin 8, applies an adhesive to the glue margin 32b, and places the adhesive on the damper 23. What is necessary is just to join.

Since the voice coil 9 of the speaker A shown in FIGS. 1 and 2 is connected to the input terminal 36 via the tinsel wire 37, by supplying an acoustic signal to the input terminal 36,
The diaphragm 7 is driven, for example, in the direction shown by the arrow F ₁ and F ₁ =
The sound radiation force of M ₁ · 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). It acts reaction force -F ₁ indicated by the arrow.

The movement of the oscillating system when the vibrating body 26 to the voice coil bobbin 8 of the vibration system are fixed to the vibrating body 7 or damper 23 constitute a vibration system of the speaker A is going to move in the F ₁ the direction of the present invention F ₂ = M ₂ · α _{2 in the} direction opposite to the sound radiation force F ₁ = M ₁ · α _{1 of the} diaphragm 7 in the direction F _{1 of the} diaphragm 7 (where M ₂ is the vibrating body 26) equivalent mass of, alpha ₂ will be acts reaction force -F ₂ indicated by the arrow in the vibrating body 26 by acting acceleration) acting on the weight 30 including the movable member 32 of the vibrating body 26.

In particular, in FIG. 1, the inertial force is increased by the pressure change of the air flowing into and out of the voice coil bobbin 8 as indicated by an arrow 31 through the magnetic gap 4.

Therefore, the reaction force -F ₁ of the diaphragm 7 against the sound radiation force F ₁ and the reaction force -F ₂ acting on the vibrating body 26 are F ₁ = M ₁ · α ₁ ≒ F ₂ = M ₂ · α ₂ By doing so, it is possible to offset or attenuate each other.

[0037] Namely, the present invention in can be eliminated reaction force -F ₁ caused by the vibration plate 7 by simply fixed by cantilevered simple vibrating body 26 in the vibration plate 7 or damper 23.

Since the vibrating body 26 is coupled to the vibrating plate 7 and the like in the above-described balancing formula, the acceleration α _{1 of the} vibrating system and α ₂ of the acceleration of the vibrating body 26 are α ₁ = α _{2. 1} = M _{1
· Α 1 ≒ F 2 = M} 1 = M 2 changed from M ₂ · α _2, equivalent mass of the vibrating body 26 will be be determined by the M ₁ = M _2.

FIG. 4 is a side sectional view when the speaker A described in detail in FIG. 1 is mounted on a phase-inversion type speaker box 21.

In FIG. 4, the speaker box 21 is formed of a synthetic resin into a box shape integrally with the baffle board 22. The first duct 34 and the opening 34a provided below the speaker sound emission hole 22a formed on the upper side of the baffle board 22 are integrally formed when the baffle plate 22 is formed.

A second duct 35 having a larger diameter than the first duct 34 is provided on the rear plate 36.
Are formed so as to overlap and have a concentric cross section within a predetermined length, and are erected integrally with the rear face plate 38 and radiated to the opening 34a of the first duct 34 through the opening 35a of the second duct 35. equivalent mass M _D and the equivalent resistance R of air
_D is increased.

The reaction forces -F _D1 and -F _D2 ducts radiation force F _D1 and F _D2 between the first duct 34 and second duct 35 in the speaker apparatus of the above-described configuration will be mutually canceled out, the speaker A Radiation force F ₁ and reaction force −F ₁ , and vibrating body 26
The reaction force -F ₂ of the acting force F ₂ can be canceled or attenuated by simply adding the vibrating body 26 to one speaker A by setting F ₁ ≒ F ₂ . Swing is prevented, and the depth of the speaker box 21 can be greatly reduced.

In the above configuration, the speaker A of FIG. 1 is mounted in the speaker box 21, but the speaker A shown in FIG.
It is clear that the same effect can be obtained even if the speaker box 21 is mounted on the speaker box 21.

[0044]

According to the speaker device of the present invention, the reaction force of the sound radiation of the speaker can be canceled or attenuated by the reaction force of the simple vibrator disposed on the diaphragm or the damper, and the sound radiation of the speaker can be reduced. The force can be made larger than usual, the low range can be expanded and the reaction force of the sound radiation of the speaker can be supported by the structure that does not require a voice coil for driving like an electric vibration transducer,
It is possible to obtain a speaker box that can suppress the swing of the speaker box that occurs in the direction opposite to the sound radiation force of the speaker.

[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 another speaker of the present invention.

FIG. 3 is a perspective view of a vibrating body used for the speaker of the present invention.

FIG. 4 is a side sectional view of the speaker device of the present invention.

FIG. 5 is a partial sectional view of a conventional speaker device.

[Explanation of symbols]

A ‥‥ Speaker, B ‥‥ Electric vibration transducer, 7
{Vibrating plate, 23} damper, 26} vibrating body, 30
{Weight, 32} movable body

Claims (4)

[Claims] 1. A speaker device having a vibration system including a vibration plate that allows a voice coil wound around a voice coil bobbin to swing through a damper in a magnetic gap of a magnetic circuit, wherein the vibration of the vibration system is A speaker device comprising a plate or the above-mentioned damper, which cantileverly supports a vibrating body on which a force acting in a reaction direction to a sound radiation direction of the diaphragm is applied. 2. The speaker device according to claim 1, wherein the vibrating body is formed of a flexible body having compliance and an equivalent mass. 3. The vibration member is cantilevered on a front surface and / or a rear surface of the vibration plate.
Or the speaker device according to claim 2. 4. The speaker device according to claim 1, wherein the vibrating body is supported on the damper in a cantilever manner.