JP4323177B2 - Vibrator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibrating body in which a drive unit is accommodated in a housing.
[0002]
[Prior art]
In mobile communication devices such as mobile phones and wearable devices such as headphones, there are many cases where a vibrating body for carrying out incoming notification of a call signal or the like by vibration is mounted.
[0003]
Conventionally, as this type of vibrator, for example, as described in “Patent Document 1”, a drive unit in which an eccentric weight is fixed to a main shaft of a cylindrical DC motor is frequently used. In addition, as described in, for example, “Patent Document 2”, a vibrating body including an electromagnetic drive type 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]
In recent multifunctional mobile phones and the like, there is a need to reduce the size of the vibrator mounted thereon as much as possible.
[0005]
However, since the vibrating body described in the above-mentioned “Patent Document 1” uses a DC motor as its drive unit, the structure of the vibrating body is complicated, and it is not easy to reduce the size thereof. There is a problem.
[0006]
On the other hand, the vibrating body described in the above-mentioned “Patent Document 2” can be simplified to some extent, but there is a problem that the 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 be reduced in size while having a simple configuration. It is intended to do.
[0008]
[Means for Solving the Problems]
The present invention is intended to achieve the above object by adopting 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 the vibrating body in which the drive unit is accommodated in the housing,
A magnetic circuit unit that forms a direct-current magnetic field between a pair of magnetic poles arranged opposite to each other at a predetermined interval; an excitation coil disposed adjacent to the magnetic circuit unit; and A balanced electromagnetic drive unit comprising a frame that supports the excitation coil, and an armature that is disposed so as to penetrate between the magnetic poles and the excitation coil and is fixed to the frame at one end. Has been
This drive unit is inserted and fixed in a hole formed in the housing at the other end of the armature ,
The housing is configured to vibrate by applying an alternating current of a predetermined frequency to the exciting coil to bend and deform the armature.
[0010]
As long as the “drive unit” is configured to vibrate the housing by the bending deformation of the armature, the specific configuration for realizing this is not particularly limited.
[0011]
The “excitation coil” may be directly supported by the frame, or may be supported by the frame via a magnetic circuit unit.
[0012]
As long as the “armature” is configured to bend and deform by the signal current applied to the exciting coil, the specific configuration such as the cross-sectional shape and material is not particularly limited.
[0013]
The “predetermined part” of the drive unit is not limited to a specific part as long as the vibration of the drive unit can be transmitted to the housing.
[0014]
[Effects of the invention]
As shown in the above configuration, in the vibrating body according to the present invention, the drive unit accommodated in the housing is arranged adjacent to the magnetic circuit unit that forms a DC magnetic field between a pair of magnetic poles. An excitation coil, a frame that supports these, and an armature that is disposed so as to penetrate between both magnetic poles and the inside of the excitation coil and is fixed to the frame at one end, are fixed to the housing at a predetermined portion of the drive unit. Since the housing is vibrated by applying a predetermined signal current to the exciting coil to bend and deform the armature, the following 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 vibrating body can have a simple configuration and can be downsized.
[0016]
As described above, according to the present invention, the vibrating body in which the drive unit is housed in the housing can be reduced in size while having a simple configuration.
[0017]
Moreover, a large driving force can be obtained with low power consumption by adopting a balanced electromagnetic driving method like the vibrating body according to the present invention. In addition, by adopting such a balanced electromagnetic drive system, it becomes possible to easily set the outer shape of the housing to a substantially rectangular parallelepiped. It is easy to secure the mounting space.
[0018]
In the above configuration, if the drive unit is configured to be fixed to the housing in the magnetic circuit unit or frame, and the weight is fixed to the other end of the armature, the following effects can be obtained. it can.
[0019]
That is, the armature tries to bend and deform by applying a signal current to the exciting coil, but since the weight is fixed to the other end of the armature, the free mass of the armature is hindered by the inertial mass of the weight. The 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, the vibration of the housing corresponding to the inertia mass of the weight is obtained, so that the vibration intensity can be set relatively accurately.
[0020]
In this case, if the above-mentioned “weight” can function as an inertial mass body that inhibits free deformation of the armature when the armature is bent and deformed, its weight, shape, size, material, etc. A specific configuration is not particularly limited.
[0021]
On the other hand, in the above configuration, if the drive unit is configured to be fixed to the housing at the other end of the armature, the following operational effects can be obtained.
[0022]
That is, the armature tends to bend and deform when a signal current is applied to the exciting coil, but the other end of the armature is fixed to the housing, so that the drive unit functions as a weight, and its inertial mass causes the armature to Free bending deformation is impeded. 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 that functions as a weight becomes sufficiently large, so that the housing can be vibrated efficiently. In addition, since it is not necessary to newly provide a weight, it is not necessary to secure a space for arranging the weight in the housing, and the cost of the vibrator can be reduced.
[0024]
Further, in the above configuration, the first diaphragm is provided in the housing so as to be supported by the housing at the peripheral portion thereof, and the other end portion of the armature is connected to the first diaphragm via a connecting piece. In addition, if the magnetic circuit unit or the frame is configured to be supported by the housing via the second diaphragm having a resonance frequency lower than that of the first diaphragm, the vibrating body also has a function as a sounding body. Can do.
[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 non-moving body, while the second diaphragm functions as a movable body. Due to the bending deformation of the armature, the drive unit vibrates with the other end of the armature as a fulcrum. Then, the vibration is transmitted to the housing via the connecting piece and the first diaphragm, so that the housing vibrates, and thereby 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 exciting coil, the second diaphragm functions as a non-moving body, whereas the first diaphragm functions as a movable body. Due to the bending deformation of the armature, the first diaphragm vibrates with one end of the armature as a fulcrum, so that electroacoustic conversion is performed, whereby the function as a sounding body is exhibited.
[0027]
DETAILED DESCRIPTION OF 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 cross-sectional view showing a state in which a vibrating body 10 according to the present embodiment is disposed upward. For the sake of convenience, the following description will be made assuming that the right direction is “front” and the left direction is “rear” in FIG.
[0030]
As shown in the figure, the vibrating body 10 according to this embodiment includes a drive unit 14 housed in a housing 12, and the drive unit 14 vibrates the housing 12.
[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 the front and back length, about 3 to 4 mm in the left and right 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 product.
[0033]
As shown in the figure, the drive unit 14 includes a magnetic circuit unit 16, an exciting coil 18, an armature frame 20, and a weight 22.
[0034]
The magnetic circuit unit 16 includes a pair of magnetic poles 24 made up of a pair of magnets opposed to each other at a predetermined interval in the vertical direction, and a horizontally-long rectangular ring-shaped yoke 26 that fixes and supports these magnetic poles 24 on the inner peripheral surface. It is made up of. And this magnetic circuit unit 16 is being fixed to the bottom wall 12a of the bottom housing 12A by laser welding etc. in the lower end surface in the state arrange | positioned so that it may open in the front-back direction.
[0035]
The exciting coil 18 is formed by winding a conductive wire in a horizontally long rectangular ring a predetermined number of times, and is bonded 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 space in the exciting coil 18 is set to be approximately 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 a U-shaped wall shape frame 28 opened forward in a plan view, and a rear side of the frame 28. The armature 30 extends horizontally from the center of the face wall 28a toward the front. As a result, the armature 30 has a cantilever fixed end at one end 30a located on the rear side, and a cantilever free end on the other end 30b located on the front side.
[0037]
The armature frame 20 is fixed to the left and right outer surfaces of the yoke 26 by laser welding or the like on the left and right side walls 28b of the frame 28 with the armature 30 penetrating the exciting coil 18 and the magnetic circuit unit 16 in the front-rear direction. At this time, the armature 30 penetrates the exciting coil 18 and the magnetic poles 24 at substantially the center in the vertical direction, and the other end 30b of the armature 30 protrudes from the front end surface of the magnetic circuit unit 16 by a predetermined length. The armature frame 20 is positioned with respect to the magnetic circuit unit 16. The exciting coil 18 is also 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-like member, and is fixed to the armature 30 by laser welding or the like in a state where the other end portion 30b of the armature 30 is fitted in the armature fitting hole 22a formed at the center position thereof. The weight 22 is made of a material having a large specific gravity such as a tungsten alloy, and the weight is set to about 10 to 300 mg.
[0039]
As shown in FIG. 1, a pair of lands 34 are provided on the outer surface of the rear wall 12 b of the bottom housing 12 </ b> A via the insulating coating 32 at a predetermined interval in the left-right direction. A pair of coil terminals 18 a extending from the exciting coil 18 are conductively fixed to the lands 34 by solder 36. Each land 34 is provided with a connection terminal (not shown) for conducting to an external device.
[0040]
Next, the effect of this embodiment is demonstrated.
[0041]
Between the pair of magnetic poles 24 in the drive unit 14, there is a state in which a direct-current magnetic field that crosses the magnetic poles 24 in the vertical direction is steadily 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 alternating magnetic field is formed between the armature 30 and both magnetic poles 24. Then, since this AC magnetic field is superimposed on the DC magnetic field, a vertical force according to the signal current acts on the armature 30, causing the armature 30 to bend and deform in the vertical direction, as indicated by arrows in FIG. Try to vibrate up and down. However, since the weight 22 is fixed to the other end 30 b of the armature 30, free inertia deformation of the armature 30 is inhibited by the inertial mass, and a reaction force acts on the armature 30 from the weight 22. The reaction force is transmitted to the housing 12 via the frame 28 and the magnetic circuit unit 16, so that the housing 12 vibrates greatly.
[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 a balanced electromagnetic drive system. The size can be reduced.
[0043]
In addition, a large driving force can be obtained with low power consumption by adopting a balanced electromagnetic driving method like the vibrating body 10 according to the present embodiment. In addition, by adopting such a balanced electromagnetic drive system, the outer shape of the housing 12 can be easily set to a substantially rectangular parallelepiped as in the present embodiment. Therefore, it is possible to easily secure the mounting space for the vibrating body 10 in the external device.
[0044]
Particularly 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 strength of vibration is 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 the left and right side walls 28b of the frame 28. Even in this case, the same effect as 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 this embodiment is also configured to vibrate the housing 12 by the drive unit 14 accommodated in the housing 12, but in this embodiment, the drive unit 14, the weight 22 as in the first embodiment is not fixed to the other end 30b of the armature 30, and the other end 30b 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 member 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 effect of this embodiment is demonstrated.
[0051]
Also in the vibrating body 50 according to the present embodiment, when an alternating current having a predetermined frequency is applied as a signal current to the excitation coil 18 of the drive unit 14, a vertical force corresponding to the signal current acts on the armature 30. Thus, 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 inhibits free deformation of the armature 30. Is done. 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 to vibrate the housing 12 by the drive unit 14 having a balanced electromagnetic drive system, and thus has the same effects as the first embodiment. Obtainable.
[0053]
Moreover, the vibrating body 50 according to the present embodiment has a sufficiently large inertial mass of the drive unit 14 that functions as a weight, 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 arranging the weight in the housing 12, and the cost of the vibrating body 50 can be reduced.
[0054]
Furthermore, in this embodiment, since the other end 30b of the armature 30 is fixed to the housing 12 via the armature fixing tool 52, the armature 30 can be easily fixed and the support strength of the armature 30 can be increased. It can be secured sufficiently. Instead of such a configuration, the other end portion 30b of the armature 30 can be directly fixed to the housing 12, and when such a configuration is adopted, the configuration of the vibrating body 50 can be changed. It can be further simplified.
[0055]
In the present embodiment, it is also 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 accommodated in the housing 12, but the 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, a first diaphragm 62 is provided in the housing 12, and the other end portion 30 b of the armature 30 is connected to the first diaphragm 62 via the connecting piece 64. It is connected.
[0060]
The first diaphragm 62 is formed by heat-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 enclosing it in a rectangular shape. The resin film 68 is supported. 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. A sound emitting hole 12e is formed in the center of the top wall of the top housing 12B so that the vibrating body 60 can also function as a sounding body.
[0062]
The connecting piece 64 is made 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 thereof, and is fixed to the diaphragm main body 66 by adhesion or the like at the upper end horizontal portion. Has been.
[0063]
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 resonance frequency of the second diaphragm 72 is 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 by bonding or the like at the outer peripheral edge thereof. The drive unit 14 is fixed to the upper surface of the second diaphragm 72 by bonding or the like at the lower end surface of the magnetic circuit unit 16.
[0065]
Next, the effect of this embodiment is demonstrated.
[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 as a signal current to the excitation coil 18 of the drive unit 14, the first diaphragm 62 is not moved. 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, and thereby the function of the vibrating body 60 as the vibrating body is exhibited.
[0067]
On the other hand, when an alternating current in a frequency band higher than the resonance frequency of the second diaphragm 72 is applied as a signal current to the excitation coil 18 of the drive unit 14, the second diaphragm 72 functions as a non-moving body, while the first diaphragm 62. Since the armature 30 functions as a movable body, the first diaphragm 62 vibrates about the one end 30a of the armature 30 as a result of bending deformation of the armature 30, whereby electroacoustic conversion is performed. The function as will be demonstrated. At that time, in the balanced electromagnetic drive system, the frequency band to be subjected to electroacoustic conversion is generally a band of 700 Hz or more, so that the second diaphragm 66 may inadvertently vibrate during electroacoustic conversion. There is nothing.
[0068]
In each of the embodiments described above, the frame 28 and the armature 30 are described as being integrally formed as the armature frame 20. However, the frame 28 and the armature 30 are formed separately, and one end 30 a of the armature 30 is formed. The frame 28 may be fixed by laser welding or the like.
[0069]
In each of the above embodiments, the pair of magnetic poles 24 for forming a DC magnetic field has been described as being composed of a pair of magnets. However, other configurations may be employed. For example, it is possible to configure 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 steel.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a vibrating body according to a first embodiment of the present invention in an upwardly arranged state. FIG. 2 is a perspective view showing a driving unit of the vibrating body as a single product. The same figure as FIG. 1 which shows the vibrating body which concerns on 2 embodiment. FIG. 4 The same figure as FIG. 1 which shows the vibrating body which concerns on 3rd Embodiment of this invention.
10, 50, 60 Vibrating body 12 Housing 12A Bottom housing 12B Top housing 12a Bottom wall 12b Rear wall 12c Front wall 12d Opening 12e Sound emitting hole 14 Drive unit 16 Magnetic circuit unit 18 Excitation 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 double wall 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 Perimeter 64 Connection Fragment 66 Diaphragm body 68 Resin film 70 Diaphragm frame 72 Second diaphragm

Claims (2)

In the vibrating body in which the drive unit is accommodated in the housing,
A magnetic circuit unit that forms a direct-current magnetic field between a pair of magnetic poles arranged opposite to each other at a predetermined interval; an excitation coil disposed adjacent to the magnetic circuit unit; and A balanced electromagnetic drive unit comprising a frame that supports the excitation coil, and an armature that is disposed so as to penetrate between the magnetic poles and the excitation coil and is fixed to the frame at one end. Has been
This drive unit is inserted and fixed in a hole formed in the housing at the other end of the armature ,
A vibrator configured to vibrate the housing by applying an alternating current of a predetermined frequency to the exciting coil to bend and deform the armature. The vibrator according to claim 1 , wherein the other end of the armature is fixedly inserted into the hole through a fixture .

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