JP2004236452A - Vibrating body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the constitution and reduce the size of a vibrator, formed by housing a drive unit in a housing. <P>SOLUTION: The vibrator is so constituted that the housing 12 is vibrated by the drive unit 14, based on a balanced electromagnetic drive method. The drive unit 14 comprises a magnetic circuit unit 16 which forms direct-current magnetic fields between a pair of magnetic poles 24; an exciting coil 18 disposed adjacently thereto; a frame 28 which supports them; an armature 30 which is formed so that it penetrates between the inside of both the magnetic poles 24 and the exciting coil 18, and is formed integrally with the frame 28 at one end 30a; and a weight 22 fixed at the other end 30b of the armature 30. The drive unit is fixed in the housing 12 by the magnetic circuit unit 16. The armature 30 is made to warp and deform by signal currents applied to the exciting coil 18, and at this time, the housing 12 is vibrated by a reaction force which acts on the armature 30 by the weight 22. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibrating body in which a drive unit is housed in a housing.
[0002]
[Prior art]
2. Description of the Related Art A mobile communication device such as a mobile phone and a wearable device such as a headphone often include a vibrating body for notifying an incoming call signal by vibration.
[0003]
2. Description of the Related Art Conventionally, as a vibrating body of this type, as described in, for example, "Patent Document 1", a vibrating body in which an eccentric weight is fixed to a main shaft of a cylindrical DC motor is frequently used. Further, as described in Patent Document 2, for example, a vibrating body including an electromagnetically driven drive unit having a U-shaped movable iron piece is also known.
[0004]
[Patent Document 1]
JP-A-9-37510 [Patent Document 2]
JP 2001-29888 A [Problems to be Solved by the Invention]
2. Description of the Related Art In recent years, there is a need for a vibrating body mounted on a multifunctional mobile phone or the like to be as small as possible.
[0005]
However, since the vibrating body described in Patent Document 1 uses a DC motor as a drive unit, the configuration of the vibrating body is complicated, and it is not easy to reduce the size of the vibrating body. There is a problem.
[0006]
On the other hand, the vibrating body described in Patent Document 2 can be simplified in its structure to some extent, but has a problem that its size cannot be sufficiently reduced.
[0007]
The present invention has been made in view of such circumstances, and provides a vibrating body in which a drive unit is housed in a housing, which can have a simple configuration and can be downsized. It is intended to do so.
[0008]
[Means for Solving the Problems]
The present invention achieves the above object by employing a balanced electromagnetic drive system as the drive system of the drive unit.
[0009]
That is, the vibrating body according to the present invention is:
In a vibrating body in which a drive unit is housed in a housing,
A magnetic circuit unit that forms a DC magnetic field between a pair of magnetic poles that are opposed to each other at a predetermined interval, an excitation coil disposed adjacent to the magnetic circuit unit, A frame supporting the excitation coil, and an armature disposed between the magnetic poles and through the excitation coil and fixed at one end to the frame, and fixed to the housing at a predetermined portion of the drive unit. The housing is vibrated by applying a predetermined signal current to the exciting coil to bend and deform the armature.
[0010]
As long as the "drive unit" is configured to vibrate the housing by bending deformation of the armature, the specific configuration for realizing this is not particularly limited.
[0011]
The “exciting coil” may be configured to be directly supported by the frame, or may be configured to be supported by the frame via a magnetic circuit unit.
[0012]
The “armature” is not particularly limited in its specific configuration such as its cross-sectional shape and material as long as it is configured to bend and deform by a signal current applied to the exciting coil.
[0013]
The “predetermined portion” of the drive unit is not limited to a specific portion as long as it can transmit vibration of the drive unit to the housing.
[0014]
Effects of the Invention
As shown in the above configuration, in the vibrator according to the present invention, the drive unit housed in the housing is disposed adjacent to the magnetic circuit unit that forms a DC magnetic field between a pair of magnetic poles. An excitation coil, a frame supporting these, and an armature arranged between both magnetic poles and through the excitation coil and having an end fixed to the frame at one end, and fixed to a housing at a predetermined portion of the drive unit. Since the housing is configured to vibrate by applying a predetermined signal current to the exciting coil to bend and deform the armature, the following operational effects can be obtained.
[0015]
That is, by adopting a configuration in which the housing is vibrated by a drive unit having such a balanced electromagnetic drive system, the vibrator can have a simple configuration and its size can be reduced.
[0016]
As described above, according to the present invention, it is possible to reduce the size of the vibrating body in which the drive unit is housed in the housing, with a simple configuration.
[0017]
Moreover, by employing a balanced electromagnetic drive system like the vibrator according to the present invention, a large drive force can be obtained with low power consumption. In addition, by adopting such a balanced electromagnetic drive method, it is possible to easily set the outer shape of the housing to a substantially rectangular parallelepiped. Mounting space can be easily secured.
[0018]
In the above configuration, if the drive unit is configured to be fixed to the housing in the magnetic circuit unit or the frame and the weight is fixed to the other end of the armature, the following operation and effect can be obtained. it can.
[0019]
That is, the armature tends to bend and deform due to the application of a signal current to the exciting coil, but since the weight is fixed to the other end of the armature, the inertial mass of the weight prevents free deformation of the armature. You. At this time, the reaction force acting on the armature from the weight is transmitted to the housing via the drive unit, so that the housing vibrates. At this time, since the vibration of the housing according to the inertial mass of the weight is obtained, the strength of the vibration can be set relatively accurately.
[0020]
In this case, if the “weight” can function as an inertial mass body that inhibits free bending deformation of the armature when the armature is deformed, its weight, shape, size, material, etc. The specific configuration is not particularly limited.
[0021]
On the other hand, in the above configuration, if the drive unit is fixed to the housing at the other end of the armature, the following operation and effect can be obtained.
[0022]
That is, the armature is bent and deformed by the application of the signal current to the excitation coil. However, since the other end of the armature is fixed to the housing, the drive unit functions as a weight, and the inertia mass of the armature causes the armature to move. Free bending deformation is hindered. At this time, the reaction force acting on the armature from the drive unit is transmitted to the housing, so that the housing vibrates.
[0023]
When such a configuration is adopted, the inertial mass of the drive unit functioning as a weight is sufficiently large, so that the housing can be vibrated efficiently. Further, since it is not necessary to newly provide a weight, it is not necessary to secure a space for disposing the weight in the housing, and the cost of the vibrating body can be reduced.
[0024]
Further, in the above configuration, a first diaphragm is provided in the housing so as to be supported by the housing at a peripheral portion thereof, and the other end of the armature is connected to the first diaphragm via a connecting piece. And if the magnetic circuit unit or the frame is supported by the housing via a second diaphragm having a lower resonance frequency than the first diaphragm, the vibrating body also has a function as a sounding body. Can be.
[0025]
That is, when an alternating current having substantially the same frequency as the resonance frequency of the second diaphragm is applied to the exciting coil, the first diaphragm functions as a stationary body while the second diaphragm functions as a movable body. The drive unit vibrates with the other end of the armature as a fulcrum due to the bending deformation of the armature. Then, the vibration is transmitted to the housing via the connecting piece and the first diaphragm, whereby the housing vibrates, whereby the function as a vibrating body is exhibited.
[0026]
On the other hand, when an alternating current in a frequency band higher than the resonance frequency of the second diaphragm is applied to the excitation coil, the second diaphragm functions as a stationary body while the first diaphragm functions as a movable body. Electroacoustic conversion is performed by vibrating the first diaphragm with one end of the armature as a fulcrum due to the bending and deformation of the armature, thereby exhibiting a function as a sounding body.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028]
First, a first embodiment of the present invention will be described.
[0029]
FIG. 1 is a side sectional view showing a state in which a vibrating body 10 according to the present embodiment is arranged upward. For convenience, the following description will be made with the right direction being “forward” and the left direction being “rearward” in FIG.
[0030]
As shown in FIG. 1, the vibrating body 10 according to the present embodiment has a drive unit 14 housed in a housing 12 and causes the housing 12 to vibrate by the drive unit 14.
[0031]
The housing 12 includes a bottom housing 12A that opens upward and a top housing 12B that closes an upper end opening of the bottom housing 12A, and has a substantially rectangular parallelepiped outer shape. The housing 12 is made of metal, and its size is set to about 5 to 6 mm in front and rear length, about 3 to 4 mm in lateral width, and about 1.5 to 2.5 mm in height.
[0032]
FIG. 2 is a perspective view showing the drive unit 14 as a single item.
[0033]
As shown in the drawing, the drive unit 14 includes a magnetic circuit unit 16, an excitation coil 18, an armature frame 20, and a weight 22.
[0034]
The magnetic circuit unit 16 includes a pair of magnetic poles 24 composed of a pair of magnets disposed to face each other at a predetermined interval in the vertical direction, and a horizontally long rectangular ring-shaped yoke 26 for fixing and supporting these magnetic poles 24 on the inner peripheral surface. It consists of The magnetic circuit unit 16 is fixed to the bottom wall 12a of the bottom housing 12A at its lower end surface by laser welding or the like, while being arranged so as to open in the front-rear direction.
[0035]
The exciting coil 18 has a conductive wire wound a predetermined number of times in a horizontally long rectangular ring shape, and is adhered and fixed to the rear end face of the magnetic circuit unit 16 on the rear side of the magnetic circuit unit 16. The vertical width of the inner space of the exciting coil 18 is set to be substantially the same as the interval between the magnetic poles 24.
[0036]
The armature frame 20 is a member formed by bending a metal plate into a substantially E-shape in a plan view, and includes a U-shaped wall-shaped frame 28 opened forward in a plan view, and a rear side of the frame 28. The armature 30 extends horizontally forward from the center of the face wall 28a. Thus, in the armature 30, one end 30a located on the rear side thereof constitutes a cantilever fixed end, and the other end 30b located on the front side thereof constitutes a free end of the cantilever.
[0037]
The armature frame 20 is fixed to the left and right outer surfaces of the yoke 26 on the left and right side walls 28b of the frame 28 by laser welding or the like, with the armature 30 penetrating the exciting coil 18 and the magnetic circuit unit 16 in the front-rear direction. At this time, this fixing is performed so that the armature 30 penetrates the substantially vertical center positions of the exciting coil 18 and the magnetic poles 24 and the other end 30b of the armature 30 protrudes from the front end face of the magnetic circuit unit 16 by a predetermined length. , The armature frame 20 is positioned with respect to the magnetic circuit unit 16. Note that the excitation coil 18 is also adhered and fixed to the left and right side walls 28b of the frame 28 in order to increase the support strength.
[0038]
The weight 22 is a block-shaped member, and is fixed to the armature 30 by laser welding or the like in a state where the other end 30b of the armature 30 is fitted into an armature fitting hole 22a formed at the center position. The weight 22 is made of a material having a large specific gravity, such as a tungsten alloy, and its weight is set to about 10 to 300 mg.
[0039]
As shown in FIG. 1, a pair of lands 34 is provided on the outer surface of the rear wall 12 b of the bottom housing 12 </ b> A at predetermined intervals in the left-right direction via an insulating coating 32. A pair of coil terminals 18 a extending from the exciting coil 18 are conductively fixed to these lands 34 by solder 36. Further, each land 34 is provided with a connection terminal (not shown) for conducting to an external device.
[0040]
Next, the operation and effect of the present embodiment will be described.
[0041]
Between the pair of magnetic poles 24 in the drive unit 14, a DC magnetic field vertically traversing between the two magnetic poles 24 is constantly formed. When a current is applied, a magnetic flux corresponding to the signal current is generated in the armature 30 penetrating the exciting coil 18, and an AC magnetic field is formed between the armature 30 and the magnetic poles 24. Then, since this AC magnetic field is superimposed on the DC magnetic field, a vertical force corresponding to the signal current acts on the armature 30, whereby the armature 30 bends and deforms in the vertical direction, as shown by arrows in FIG. Try to vibrate up and down. However, since the weight 22 is fixed to the other end portion 30 b of the armature 30, the inertial mass of the armature 30 prevents free bending deformation of the armature 30, and a reaction force acts on the armature 30 from the weight 22. Then, the reaction force is transmitted to the housing 12 via the frame 28 and the magnetic circuit unit 16, so that the housing 12 greatly vibrates.
[0042]
As described above, the vibrating body 10 according to the present embodiment is configured to vibrate the housing 12 by the drive unit 14 having the balanced electromagnetic driving method. The size can be reduced.
[0043]
In addition, by employing a balanced electromagnetic driving method as in the vibrating body 10 according to the present embodiment, a large driving force can be obtained with low power consumption. Further, by adopting such a balanced electromagnetic drive system, it is possible to easily set the outer shape of the housing 12 to a substantially rectangular parallelepiped as in the present embodiment. Thus, it is possible to easily secure a mounting space for the vibrating body 10 in the external device.
[0044]
In particular, in the present embodiment, since the drive unit 14 is fixed to the housing 12 in the magnetic circuit unit 16, vibration of the housing 12 according to the inertial mass of the weight 22 can be obtained, and the vibration intensity can be set. Can be performed relatively accurately.
[0045]
Instead of fixing the drive unit 14 to the housing 12 in the magnetic circuit unit 16 as in the present embodiment, it is also possible to fix the drive unit 14 to the housing 12 on both left and right side walls 28b of the frame 28. In this case, the same operation and effect as those of the present embodiment can be obtained.
[0046]
Next, a second embodiment of the present invention will be described.
[0047]
FIG. 3 is a view similar to FIG. 1, showing the vibrating body 50 according to the present embodiment.
[0048]
As shown in the figure, the vibrating body 50 according to the present embodiment is also configured to vibrate the housing 12 by the drive unit 14 housed in the housing 12, but in the present embodiment, the drive unit The weight 22 as in the first embodiment is not fixed to the other end 30 b of the armature 30 in 14, but the other end 30 b of the armature 30 is fixed to the housing 12 instead.
[0049]
This fixing is performed on the front wall 12c of the bottom housing 12A via the armature fixing tool 52. That is, the armature 30 is fixed to the armature fixture 52 by laser welding or the like with the other end 30b inserted into the armature insertion hole 52a of the armature fixture 52. The armature fixture 52 is fixed to the front wall 12c by laser welding or the like while being inserted into an opening 12d formed in the front wall 12c of the bottom housing 12A.
[0050]
Next, the operation and effect of the present embodiment will be described.
[0051]
Also in the vibrating body 50 according to the present embodiment, when an alternating current having a predetermined frequency is applied to the excitation coil 18 of the drive unit 14 as a signal current, a vertical force corresponding to the signal current acts on the armature 30. The armature 30 is bent and deformed in the vertical direction. At this time, in the present embodiment, since the other end 30b of the armature 30 is fixed to the housing 12, the drive unit 14 functions as a weight, and the inertial mass of the drive unit 14 prevents free deformation of the armature 30. Is done. Then, at this time, the reaction force acting on the armature 30 is transmitted from the drive unit 14 to the housing 12, so that the housing 12 vibrates.
[0052]
As described above, the vibrating body 50 according to the present embodiment is also configured so that the housing 12 is vibrated by the drive unit 14 having the balanced electromagnetic drive system. Obtainable.
[0053]
In addition, in the vibrating body 50 according to the present embodiment, the inertial mass of the drive unit 14 functioning as a weight is sufficiently large, so that the housing 12 can be vibrated efficiently. Further, since it is not necessary to newly provide a weight, it is not necessary to secure a space for disposing the weight in the housing 12, and the cost of the vibrating body 50 can be reduced.
[0054]
Further, in the present embodiment, since the other end 30b of the armature 30 is fixed to the housing 12 via the armature fixture 52, the armature 30 can be easily fixed, and the supporting strength of the armature 30 can be reduced. It can be sufficiently secured. Instead of such a configuration, it is also possible to adopt a configuration in which the other end 30b of the armature 30 is directly fixed to the housing 12, and when such a configuration is adopted, the configuration of the vibrating body 50 is changed. It can be further simplified.
[0055]
Further, in the present embodiment, it is possible to further increase the inertial mass of the drive unit 14 by adding a new weight to the drive unit 14.
[0056]
Next, a third embodiment of the present invention will be described.
[0057]
FIG. 4 is a view similar to FIG. 1, showing the vibrating body 60 according to the present embodiment.
[0058]
As shown in the figure, the vibrating body 60 according to the present embodiment is also configured to vibrate the housing 12 by the drive unit 14 housed in the housing 12, but this vibrating body 60 is used as a sounding body. It also has the function of
[0059]
That is, in the vibrating body 60 according to the present embodiment, the first diaphragm 62 is provided in the housing 12, and the other end 30 b of the armature 30 is connected to the first diaphragm 62 via the connecting piece 64. Are linked.
[0060]
The first diaphragm 62 is formed by heating and pressing a resin film 68 on the upper surface of a diaphragm main body 66 made of a substantially rectangular metal plate, and the diaphragm main body 66 is attached to a metal diaphragm frame 70 that surrounds the rectangular main body. It is supported via a resin film 68. The diaphragm frame 70 is fixed to the upper end opening of the bottom housing 12A by laser welding or the like.
[0061]
The top housing 12B is fixed to the upper surface of the first diaphragm 62 by bonding or the like. At the center of the top wall of the top housing 12B, a sound emission hole 12e is formed so that the vibrating body 60 can also function as a sounding body.
[0062]
The connecting piece 64 is formed of an inverted L-shaped metal plate, and is fixed to the other end 30b of the armature 30 by laser welding or the like at the vertical lower end, and is fixed to the diaphragm main body 66 at the horizontal upper end by bonding or the like. Have been.
[0063]
Further, in the vibrating body 60 according to the present embodiment, the drive unit 14 is supported by the housing 12 via the second diaphragm 72.
[0064]
The second diaphragm 72 has a resonance frequency set to a value lower than that of the first diaphragm 62 (for example, about 150 Hz), and is fixed to the bottom wall 12a of the bottom housing 12A at the outer peripheral edge thereof by bonding or the like. The drive unit 14 is fixed to the upper surface of the second diaphragm 72 at the lower end surface of the magnetic circuit unit 16 by bonding or the like.
[0065]
Next, the operation and effect of the present embodiment will be described.
[0066]
In the vibrating body 60 according to the present embodiment, when an alternating current having substantially the same frequency as the resonance frequency of the second diaphragm 72 is applied to the excitation coil 18 of the drive unit 14 as a signal current, the first diaphragm 62 becomes immobile. On the other hand, since the second diaphragm 66 functions as a movable body, the drive unit 14 vibrates with the other end 30b of the armature 30 as a fulcrum due to the bending deformation of the armature 30. Then, the vibration is transmitted to the housing 12 via the connecting piece 64 and the first diaphragm 62, so that the housing 12 vibrates, whereby the function of the vibrating body 60 as a vibrating body is exhibited.
[0067]
On the other hand, when an alternating current having a frequency band higher than the resonance frequency of the second diaphragm 72 is applied to the excitation coil 18 of the drive unit 14 as a signal current, the second diaphragm 72 functions as a stationary body, while the first diaphragm 62 operates. Functions as a movable body, the first diaphragm 62 vibrates around the one end 30a of the armature 30 as a fulcrum by bending deformation of the armature 30 to perform electroacoustic conversion. Function will be exhibited. In this case, since the frequency band to be subjected to electroacoustic conversion in the balanced electromagnetic drive system is generally a band of 700 Hz or more, the second diaphragm 66 may inadvertently vibrate during electroacoustic conversion. Never.
[0068]
In the above embodiments, the frame 28 and the armature 30 have been described as being integrally formed as the armature frame 20. However, the frame 28 and the armature 30 are formed separately, and one end 30a of the armature 30 is formed. The frame 28 may be fixed by laser welding or the like.
[0069]
Further, in each of the above embodiments, the pair of magnetic poles 24 for forming a DC magnetic field has been described as being constituted by a pair of magnets. However, other configurations can be adopted. For example, it is possible to form both magnetic poles with a single magnet formed in a substantially U shape, or to configure one magnetic pole with a magnet and the other magnetic pole with a magnetic material such as a steel material.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a state in which a vibrating body according to a first embodiment of the present invention is arranged upward. FIG. 2 is a perspective view showing a drive unit of the vibrating body as a single unit. FIG. FIG. 4 is a view similar to FIG. 1 showing a vibrator according to a second embodiment. FIG. 4 is a view similar to FIG. 1 showing a vibrator according to a third embodiment of the present invention.
10, 50, 60 Vibration body 12 Housing 12A Bottom housing 12B Top housing 12a Bottom wall 12b Back wall 12c Front wall 12d Opening 12e Sound emission hole 14 Drive unit 16 Magnetic circuit unit 18 Exciting coil 18a Coil terminal 20 Armature frame 22 Weight 22a Armature fitting hole 24 Magnetic pole 26 Yoke 28 Frame 28a Rear wall 28b Left and right side walls 30 Armature 30a One end 30b Other end 32 Insulating coating 34 Land 36 Solder 52 Armature fixture 52a Armature insertion hole 62 First diaphragm 62a Peripheral edge 64 Connection Piece 66 Diaphragm body 68 Resin film 70 Diaphragm frame 72 Second diaphragm

Claims (4)

In a vibrating body in which a drive unit is housed in a housing,
A magnetic circuit unit that forms a DC magnetic field between a pair of magnetic poles that are opposed to each other at a predetermined interval, an excitation coil disposed adjacent to the magnetic circuit unit, A frame supporting the excitation coil, and an armature disposed between the magnetic poles and through the excitation coil and fixed at one end to the frame, and fixed to the housing at a predetermined portion of the drive unit. A vibrating body, wherein the vibrating body is configured to apply a predetermined signal current to the exciting coil to bend and deform the armature to vibrate the housing. The drive unit is fixed to the housing at the magnetic circuit unit or the frame,
The vibrating body according to claim 1, wherein a weight is fixed to the other end of the armature. The vibrating body according to claim 1, wherein the drive unit is fixed to the housing at the other end of the armature. A first diaphragm is provided in the housing such that a peripheral portion is supported by the housing, and the other end of the armature is connected to the first diaphragm via a connecting piece,
The vibrating body according to claim 1, wherein the magnetic circuit unit or the frame is supported by the housing via a second diaphragm having a lower resonance frequency than the first diaphragm.

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