JP3494979B2 - Vibration generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator.

[0002]

2. Description of the Related Art Conventionally, in a mobile device such as a mobile phone which is a terminal of a mobile communication device, a vibration generator is housed in the mobile device itself or an accessory of the mobile device, instead of signaling an incoming call with a ringing tone. In some cases, the human body senses an incoming call by vibrating the vibration generator.

In this type of conventional vibration generator, a rotating body is attached to a rotating shaft of a motor, the center of gravity of the rotating body is placed at a position different from that of the rotating shaft, and the rotating body is rotated. There was a structure that generated vibration.

However, since the vibration generator having such a structure uses the vibration of the rotating shaft when rotating the rotating body as vibration, the bearing portion of the rotating shaft of the motor receives a harsh force and its durability is high. There was a problem of impairing reliability.

Therefore, the applicant of the present application has filed a prior application
00-156964), as shown in FIG.
The mover yokes 134 and 135 are provided on both end surfaces of the permanent magnet 136.
And a stator 130 in which a coil 140 is wound around a central yoke 115 provided on the stator yoke 113.
0, and coil springs 150 and 150 that pivotally support the mover 130 with respect to the stator 110 so that the stator yoke 113 is excited by the coil 140 to cause the mover 130 to vibrate in a predetermined vibration. It is configured to vibrate with a number.

The reason why the weight 138 is attached to the mover 130 in the above-mentioned conventional example is as follows. That is, the momentum of the mover 130 is such that m is the mass of the mover 130, v is the speed of the mover 130, and the stator 110 and the stator 110 are
The mass of the entire member (for example, a mobile device) attached with
When the velocity is V, there is a relation of “mv = MV”. Therefore, in order to increase the amount of vibration on the stator side, it is necessary to increase the mass m and the speed v of the mover 130. Therefore, the weight 138 is attached to the mover 130 to increase the mass.

However, in the conventional vibration generator 100 shown in FIG. 16, since the weight 138 is attached to the upper part of the mover 130, the height of the mover 130 as a whole is increased, and therefore the vibration generator 100 is downsized. There is a problem that it cannot be made thinner. The weight 138 is the vibration generator 1.
Due to the structure of No. 00, there is no place to attach to the side surface or the lower surface of the mover 130.

It is desirable that the weight 138 is formed of a non-magnetic material so that a magnetic path is not formed in the weight 138. Then, the weight 138 is not attracted to the permanent magnet 136 by magnetic force,
Such as having to fix it separately with an adhesive, etc.
The assembly was complicated.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to reduce the size and thickness of the entire vibration generator even if a weight is attached, and to reduce the size of the mover. It is to provide a vibration generator that is easy to assemble.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, a vibration generator according to the present invention provides a movable element having a permanent magnet attached to a movable element yoke, and a predetermined gap between the movable element end surface and the movable element. A stator that has end faces that face each other and forms a magnetic path between the coil and the mover by exciting the coil by attaching a current to the coil, and one end to the mover side and the other end to the stator side. An elastic support member that supports the mover so that the mover can vibrate in the magnetization direction of the stator by the coil, and a weight is provided on the surface of the mover yoke facing the stator.
And install the permanent magnet in the storage part provided on the weight.
With this permanent magnet installed, pair it with the stator of the mover yoke.
It is characterized by being attached to the surface on the opposite side.

Further, by disposing one magnetic pole surface of the permanent magnet so as to face the outer peripheral side surface of the coil attached to the stator, the magnetic flux generated from the magnetic pole surface of the permanent magnet passes through the outer peripheral side surface of the coil to the inside of the coil. It is characterized in that a magnetic path is formed so as to be directed to the magnetization direction of the stator by the coil after being incident on.

According to the present invention, the accommodating portion provided on the weight is
Characterized in that the said weight by installing a housing the permanent magnet mover yoke with accommodating the permanent magnet also shaped to be fixed to the movable piece yoke.

According to the present invention, the weight is provided with a fitting portion for positioning to the mover yoke, so that when the permanent magnet is housed in the housing portion of the weight and attached to the mover yoke, It is characterized in that the attachment position to the mover yoke is positioned by the weight.

Further, according to the present invention, arm portions extending toward the stator side are provided on both sides of the mover yoke, and the inner side surfaces of the arm portions face both end surfaces of the stator with predetermined gaps respectively. On the other hand, the fitting portion of the weight is formed in a shape that is positioned in a portion between both arm portions of the mover yoke.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a vibration generator 1 according to an embodiment of the present invention, FIG.
2B is a side view and FIG. 3 is an exploded perspective view. As shown in these drawings, the vibration generator 1 is configured by supporting the mover 50 on the upper part of the stator 10 by two elastic support members 80, 80. Each component will be described below.

As shown in FIG. 3, the stator 10 comprises a core-equipped coil 30 and two elastic members 4 on a base 20 with terminals.
0 and 40 are attached. The base unit 20 with terminals is configured by molding a base body 21 made of a plate-shaped synthetic resin material around two metal terminal plates 23, 23 shown in FIG. 4 as shown in FIG. Cage, both terminal boards 2
The connecting portions 231 and 231 provided at the centers of the terminals 3 and 23 are exposed at the left and right centers of the upper surface of the base body 21, while the surfaces of the terminal portions 233 and 233 of both terminals 23 and 23 are exposed to the base body as shown in FIG. It is exposed on the lower surface of 21. On the upper surface of the base body 21, elastic body mounting portions 211 and 211 are provided on both left and right sides, and a concave storage portion 213 for storing the cored coil 30 is provided between the elastic body mounting portions 211 and 211. Stand body 2
Two spring end fixing portions 217 and 217 each formed of a small hole are provided at the center of the upper surface near both side edges 215 and 215, and a portion where the spring end fixing portions 217 and 217 near both side edges 215 and 215 are provided. Spring engaging portions 219 and 219 are provided on both sides of the spring.

The cored coil 30 is constructed by winding a coil 33 around a substantially rod-shaped coil core 31 and drawing out coil end portions 35, 35 from both ends of the coil core 31, respectively. Here, the coil core 31 is formed of an iron sintered body in a substantially rectangular columnar shape, and as shown in FIG. 9, the end faces 37, 37 at both ends thereof are described below.
The end faces 53, 53 are formed in parallel with the end faces 53, 53 as a tapered surface having an inclination angle substantially the same as that of the end faces 53, 53.

The elastic body 40 is made of a thin rubber plate, and is formed in such a shape that it can be mounted on the elastic body mounting portions 211 and 211 of the base portion 20 with terminals, respectively. The coil mounting portions 401, 401 are used.

To assemble the stator 10, the coil 30 with a core is housed in the housing portion 213 of the base portion 20 with terminals and fixed with an adhesive or the like.
Connecting part 23 exposing 5 to the upper surface of the base part 20 with terminals
1 and 231 are connected / fixed by various fixing means such as a low melting point metal, a conductive adhesive or welding, and elastic bodies 40 and 40 are respectively attached to the elastic body mounting portions 211 and 211 of the base unit 20 with terminals. This is done by placing. This stator 10 has terminal portions 233, 233 of both terminals 23, 23.
By exposing the surface of the lower surface of the base body 21 to a surface mounting type in which the low melting point metal can be directly attached to the circuit pattern on the substrate to which the vibration generator 1 is attached by reflowing or the like. There is.

Next, as shown in FIGS. 1 to 3, each of the elastic supporting members 80, 80 is a so-called double torsion coil spring constructed by bending a single wire rod, and wound about one and a half turns. Two coil parts 8
Two substantially parallel arm portions 83, 83 and two arm portions 85, 85 project from both sides of the armature 1, 81, and the arm portions 83, 83 extending in one direction are connected by a connecting portion 82, and the other The arms 85, 85 of the above are bent at the ends thereof downward to form locking ends 87, 87.

FIG. 6 is an exploded perspective view of the mover 50. As shown in the figure, the mover 50 is configured by attaching a weight 60, a permanent magnet 70, and a center yoke 75 to a mover yoke 51 made of the same material as the coil core 31.

The mover yoke 51 has a substantially quadrangular prism shape (rod shape), and the arm portions 5 extending toward the stator 10 side at both ends thereof.
2, 52 are provided, and are formed in a substantially "U" shape as a whole,
The inner surfaces of the arms 52, 52 are attached to the end surface 3 of the coil core 31.
7 and 37 are tapered end faces 53, 53 facing each other with a predetermined gap, and L for locking the connecting portions 82, 82 of the elastic support members 80, 80 on both outer side surfaces of the arms 52, 52. Locking parts 55, 5 consisting of notches that bend in a letter shape
5 is provided.

The weight 60 is made of a non-magnetic material (for example, a molding die in which a powder of a non-magnetic heavy metal such as tungsten is contained in a molding resin such as nylon) so that a magnetic path is not formed in the weight 60. It is composed by. Here, FIG. 7 is a sectional view taken along line AA of the weight 60 shown in FIG. As shown in FIGS. 6 and 7, a storage portion 61 into which the permanent magnet 70 is fitted is provided in the center of the weight 60, and the storage portion 61 has a concave portion at an upper portion thereof, which is a lower surface and a side surface of the mover yoke 51. There is provided a fitting portion 63 having a size and shape that fits in. That is, the fitting portion 6
3, the width of the weight 60 is almost the same as the width of the mover yoke 51, and the length of the weight 60 in the vibration direction is 3 of the arms 5 of the mover yoke 51.
The width dimension between the base portions a and a of the second and the second portions 52 is substantially the same. The fitting portion 63 of the weight 60 is attached to the portion between the arms 52 and 52 of the mover yoke 51. When
The weight 60 is configured to be correctly positioned on the mover yoke 51. Further, notches 65 are provided at the four corners of the lower surface of the weight 60. The notch 65 is a coil portion 81 of the elastic support members 80, 80 when the mover 50 vibrates.
Is for preventing the weight from colliding with the weight 60. In addition, as shown in FIG.
By forming the step portion 68 by forming the width k) in the direction perpendicular to the vibration direction of 10 to be slightly larger than the width of the fitting portion 63,
The width is approximately the same as that of the permanent magnet 70. The height dimension of the storage portion 61 is formed to be substantially the same as the thickness dimension of the permanent magnet 70.

Next, the permanent magnet 70 is a rectangular plate member, and the upper and lower surfaces thereof are constructed as SN magnetic poles. The dimensions of the surface of the permanent magnet 70 in the vertical and horizontal directions are substantially the same as the dimensions of the upper surface of the coil 33 in the vertical and horizontal directions.
Has a dimension and shape that just covers the upper surface of the.

Next, the center yoke 75 is a thin rectangular plate member, and the length dimension L1 of the mover 50 in the vibration direction is set to be the same as the length dimension of the permanent magnet 70 in the same direction.
The length dimension L2 in the direction perpendicular to the vibration direction of 0 is formed to be the same as the length dimension in the same direction of the weight 60. As the material of the center yoke 75, pure iron or the like is used for collecting magnetic flux in the center yoke 75.

The mover 50 is assembled by inserting the permanent magnet 70 into the accommodating portion 61 of the weight 60 with the fitting portion 63 of the weight 60 fitted in the center of the lower surface of the mover yoke 51. It is performed by attaching the center yoke 75 to the. FIG. 8 is a sectional view of the same portion as FIG. 7 when assembled. The permanent magnet 70 is attracted to the mover yoke 51 by its strong magnetic force, and the permanent magnet 70 causes the step portion 6 of the weight 60 to move.
The weight 60 is also fixed to the mover yoke 51 by engaging with 8. The center yoke 75 is also attracted and fixed to the permanent magnet 70 by a strong magnetic force. Therefore, it is not necessary to separately fix these members with an adhesive material or the like, and the manufacturing can be performed simply by combining them. Further, the weight 60 is positioned with respect to the mover yoke 51 by the fitting portion 63 thereof, the permanent magnet 70 is positioned by the housing portion 61, and the center yoke 75 has the center of its surface in the center of the surface of the permanent magnet 70. Since they are sucked so as to match with each other, their positioning can be achieved, and therefore, the respective members can be automatically positioned by simply combining them without special care of positioning.

Next, in order to assemble the vibration generator 1, in FIG. 3, the elastic support members 80, 80 are attached to the spring end fixing portions 217, 217 of the stator 10 to which the coil with core 30 and the elastic bodies 40, 40 are attached. Insert the locking ends 87, 87,
At the same time, the arm portions 85 of the elastic support members 80, 80 are locked to the spring locking portions 219 of the stator 10. In this way, the engaging end portions 87, 87 of the elastic support members 80, 80 and the arm portion 8 are
By fixing 5, the coil portions 81, 81 are elastic body 40.
The elastic support members 80, 80 are reliably supported at three points by abutting on the coil mounting portions 401, 401 in a slightly elastic state. Then, the vibration generator 1 shown in FIGS. 1 and 2 is completed by inserting and locking the connecting portions 82 and 82 of the elastic support members 80 and 80 into the locking portions 55 and 55 of the mover 50.

FIG. 9 is a view showing the positional relationship between the stator 10 and the mover 50 of the vibration generator 1. As shown in the figure, both end faces 37, 37 of the stator 10 are opposite end faces 53, 53 of the mover 50.
The facing surfaces are parallel to each other with a predetermined gap 28 between them (the left and right gap dimensions are the same). The mover 50 includes elastic support members 80, 80.
The coil 33 supports the stator 10 so that it can oscillate in the direction of magnetization of the stator 10 (that is, the left-right direction in FIG. 9).
At this time, the magnetic pole surface of the permanent magnet 70 on the side where the center yoke 75 is attached is installed via the gap 27 so as to face the outer peripheral side surface of the coil 33, and the facing surfaces are configured to be parallel.

The magnetic path of the vibration generator 1 configured as described above enters the coil core 31 through the outer peripheral side surface of the coil 33 from the magnetic pole surface of the permanent magnet 70 on the side where the center yoke 75 is attached, and inside the coil core 31. Coil 33
Is guided so as to face the magnetization direction of the stator 10 (NS magnetic pole direction, that is, both end faces 37, 37 direction), and further passes through the gaps 28, 28 from both end faces 37, 37 of the coil core 31 and both end faces of the mover 50. 53 and 53 mover yoke 5
It is formed so as to return from the center of 1 to the other magnetic pole surface of the permanent magnet 70 again.

The vibration generator 1 is placed on a circuit board (not shown), and the terminal portion 233 of the terminal-equipped base portion 20 is brought into contact with a circuit pattern (terminal pattern) provided on the circuit board to lower the vibration. It is electrically and mechanically connected and fixed with a metal having a melting point. Then, from the circuit board side (not shown), the coil 33
When a predetermined current is applied to the mover 50, the mover 50 starts simple vibration to the left and right. The principle of operation will be described below.

First, FIG. 12 is a diagram showing the relationship between the lateral displacement x (mm) of the mover 50 and the thrust F (N) acting on the mover 50 in the left-right direction. The thrust F indicates a force to the right in FIG. 9, and a thrust indicates a force to the left in FIG. As for the displacement x, plus indicates displacement in the right direction in FIG. 9, and minus indicates displacement in the left direction in FIG. 9. In this embodiment, the dimensions of the gaps 28, 28 (horizontal direction)
Are 1.5 mm each.

The circular points show the state of the resultant force of the magnetic force of the permanent magnet 70 that does not flow current through the coil 33 and the elastic force of the elastic supporting members 80, 80, and the triangular points show the coil 33.
Shows the total force state in which the magnetic force of the permanent magnet 70 and the elastic force of the elastic support members 80, 80 are added to the electromagnetic force when a current of NI = + 100 (AT) is applied to the coil 33. The magnetic force of the permanent magnet 70 and the elastic support member 8 are added to the electromagnetic force when a current of NI = -100 (AT) is applied to
It shows the state of total force, which is the sum of the resilience of 0,80.

As shown in the figure, in any state, the thrust force applied to the mover 50 is substantially linear, which means that the mover 50 is suitable for simple vibration. ing. The reason for such thrust is as follows.

That is, as shown by the line a in FIG. 13, the thrust force of the elastic support members 80, 80 linearly returns the mover 50 to the neutral position as the displacement amount increases. On the other hand, as shown by the line b in FIG. 13, the thrust force by the permanent magnet 70 alone is the thrust force in the direction opposite to the thrust force of the elastic support members 80, 80, but when the displacement amount is small, it hardly works and the displacement amount increases. When either of the gaps 28, 28 on the left or the right becomes smaller, the gaps increase sharply toward the smaller one. Therefore, when the thrust forces of the two are combined, the thrust force becomes substantially linear as shown by the circular points in FIG. The permanent magnet 70
The thrust due to only becomes as shown by the line b in FIG.
This is because both end faces 53, 53 of the mover 50 are S poles, so that when the mover 50 is in the neutral position, it is not attracted to either the left or the right. However, either end face 53, 53
Is approaching any one of the end faces 37, 37 of the stator 10, the thrust to be attracted to that end face increases exponentially. As described above, since the thrust force generated only by the permanent magnet 70 is small in the vicinity of the neutral point, the mover 50 can be moved to the neutral position when the coil 33 is not energized without increasing the elastic force of the elastic support members 80, 80. It can be easily kept in the state of being held at.

Then, NI = + 100 (A
T), the left and right end faces 37, 37 of the stator 10 are caused to flow.
When the NS magnetic pole is excited, as shown in FIG. 12, the thrust by the permanent magnet 70 and the elastic support members 80, 80 is a thrust in a state in which the thrust is substantially translated in the upward direction with a predetermined width. That is, at any displacement position, the thrust force is larger than the thrust force by the permanent magnet 70 and the elastic support members 80, 80 by a substantially constant displacement amount. On the contrary, when a current of NI = -100 AT is flown, on the contrary, it moves substantially in the downward direction.

This is for the following reason. That is, the coil 33
When an NS magnetic pole is generated on both end faces 37, 37 of the stator 10 as shown in FIG. 14 by applying a current to the left end face 3
A repulsive force acts between 7 and 53, a suction force acts between the right end faces 37 and 53, and a thrust force moving leftward acts on the mover 50. On the other hand, as the mover 50 moves leftward, the suction force acting between the right end surfaces 37 and 53 increases, but the repulsive force acting between the left end surfaces 37 and 53 decreases. Therefore, as a whole, the thrust force to move the mover 50 to the left is substantially constant at any position.

Further, in the present invention, another thrust acts. That is, as shown in FIG. 14, the magnetic flux G from the magnetic pole surface of the permanent magnet 70 on the side where the center yoke 75 is attached.
Enters the coil 33 through the outer peripheral side surface of the coil 33 and is guided in the coil core 31 so as to face the NS magnetic pole direction of the coil 33. Therefore, when a current flows through the coil 33, FIG. 15 shows the state when the coil 33 is viewed from the right side shown in FIG. 14. When the NS magnetic pole is formed by the coil 33 as shown in FIG. 15, a thrust force on the front side of the coil 33 (that is, in the right direction in FIG. 14) acts on the upper side 331 of the coil 33 according to Fleming's law, and the left and right sides 333 of the coil 33 are indicated. Thrust does not act on 335, and the bottom side 337
Thrust force on the back side of the paper (that is, leftward in FIG. 14) acts on the coil 3 compared to the magnetic flux passing through the upper side 331 of the coil 33.
Since the magnetic flux passing through the third lower side 337 is much smaller, the thrust force toward the right in FIG. Since the stator 10 is fixed, a thrust force toward the left acts on the mover 50 due to the reaction. Therefore, in addition to the thrust by the electromagnetic force of the coil 33, the thrust by the Fleming's law is applied in the same direction, so that the overall thrust for driving the mover 50 is increased. When a reverse current flows through the coil 33, the thrust force according to Fleming's law also becomes reverse. In the case of this embodiment,
Since the center yoke 75 made of a high-permeability material is attached to the magnetic pole surface of the permanent magnet 70 on the side facing the outer peripheral surface of the coil 33, the magnetic flux can be concentrated on the magnetic pole surface, and this can be collected. It can be effectively guided to the inside through the outer peripheral side surface. Therefore, the thrust force according to Fleming's law increases.

Next, a method of driving the vibration generator 1 will be described. As shown in FIG. 9, when the coil 33 is not energized, the elastic support members 80 maintain the mover 50 in the neutral position. Next, a current (NI = -100) is applied to the coil 33.
AT) is supplied to both end surfaces 37, 37 of the coil core 31.
As shown in FIG. 14, the NS magnetic pole is excited,
The right end surface 53 of the is attracted toward the facing end surface 37 (to the left). This is because the square points in FIG. 12 have a negative thrust at the displacement x = 0 mm. When the right end surface 53 of the mover 50 approaches the facing end surface 37, the direction of the current supplied to the coil 33 is reversed (NI = + 100AT).
In Fig. 2, the thrust is a triangular point, which is a thrust pulling the mover 50 in the opposite direction (to the right), so that the mover 50 starts moving in the opposite direction.

By repeating the reversal of the current in accordance with the vibration frequency of the mover 50, the mover 50 is moved just before the both end faces 53, 53 of the mover 30 come into contact with the end faces 37, 37 of the stator 10. Reverse movement (ie end face 37,
37 and the end faces 53, 53 do not always contact each other), the mover 5
Zero vibrations can be repeated.

In this embodiment, since the mover 50 is supported by the pair of left and right elastic support members 80, 80,
The movement of the mover 50 can be made substantially parallel to the horizontal direction, and the movement of the end surfaces 53, 53 of the mover 50 relative to the end surfaces 37, 37 of the stator 10 can be made substantially parallel movement. The gap 27 between the yoke 75 and the stator 10 also remains substantially constant, so that stable vibration can be secured with a structure that does not disturb the magnetic circuit.

By passing a current through the coil 33, the mover 50 is once drawn to one of the end faces 37, 37, and then the current supply is stopped so that the mover 50 vibrates at a predetermined resonance frequency. Then, when the vibration is attenuated, a current may be passed through the coil 30 again to increase the amplitude of the mover 50, and then the operation of stopping the current again may be repeated. Further, the current may be supplied in a pulse shape at other timing. With this configuration, power saving can be achieved.

Further, in this embodiment, arm portions 52, 52 extending toward the stator side are provided on both sides of the mover 50, and the arm portion 5 is provided.
Since the inner surfaces of 2, 52 are the end surfaces 53, 53 facing the both end surfaces 37, 37 of the stator 10 with a predetermined gap, respectively, from the shape, the center of gravity of the mover 50 is low and a stable bilaterally symmetrical shape. The vibration is stable.

FIG. 10 is a view showing a structure for fixing the elastic supporting member 80 to the base 20 with terminals. As shown in the figure, in the elastic support member 80, a portion of the locking end portion 87, a portion of the arm portion 85 locked by the spring locking portion 219, and a portion of the coil portion 81 elastically contacting the elastic body 40. Of 3
Since it is supported by points, its fixation is reliable. Further, the end portion of the elastic support member 80 on the arm portion 83 side oscillates in the direction of arrow B shown in FIG.
In the present embodiment, since the coil portion 81 is supported by the elastic body 40, the coil portion 81 pushes the elastic body 40 and is slightly pushed down in the direction of the arrow C, which further increases the swing amount of the arm portion 83 side end portion. , It becomes possible to move to the position of the dotted line b, whereby the swing stroke of the mover 50 is increased and more effective vibration can be performed.

Further, in this embodiment, the center yoke 75 is attached to the lower surface of the permanent magnet 70, and the width of the center yoke 75 is made larger than the width of the permanent magnet 70 as shown in FIG. For the reason. That is, when the thickness of the permanent magnet 70 is thin as in this embodiment, the magnetic flux does not reach a long distance as shown in FIG. There are many things that are wasted because they do not enter. Further, of the sides 70 a to 70 d of the permanent magnet 70, the opposite side 70
The magnetic lines of force passing over the portions b and 70d hardly enter the coil core 31, and do not contribute to the vibration of the mover 50. Therefore, as shown in FIG. 11B, the center yoke 75 is provided to increase the shortest distance between the NS magnetic poles, thereby increasing the number of magnetic lines of force incident on the coil core 31, and more than the width of the permanent magnet 70. 7
The width of 5 is increased to reduce the number of magnetic lines of force passing through the portions of the sides 70b and 70d to reduce the sides 70a and 70c.
By increasing the number of magnetic lines of force passing over the portion of, the number of magnetic lines of force incident on the coil core 31 is increased, and thereby the magnetic lines of force of the permanent magnet 70 can be more effectively utilized for the vibration of the mover 50. Of.

Further, in the above embodiment, as shown in FIG. 9, both end faces 37, 37 of the stator 10 and both end faces 53, 53 of the mover 50 are parallel to each other and the stator 10
The reason why the taper surface is inclined so as to expand toward the side is as follows. That is, the magnetic flux has the property of flowing in the shortest distance portion of the gaps 28, 28. At the same time, it is necessary to reduce the magnetic flux density in order to avoid magnetic saturation. Therefore, by making the opposite end surfaces parallel to each other so that the magnetic flux can uniformly pass through the gap 28, and at the same time, by forming the inclined surface to increase the area of the surface, it is possible to avoid magnetic saturation and ensure good vibration. I made it possible. In addition, the taper surface having an inclination so as to spread toward the stator 10 side is formed in this manner, and thus the mover 50 has the arrow E direction shown in FIG.
That is, in addition to the force in the direction of vibrating the mover 50, the force acting in the direction of the arrow F, that is, the force pulling the mover 50 toward the stator 10 acts. When a strong impact is applied to the vibration generator 1 by dropping the device to which the vibration generator 1 is attached, the heavy mover 50 may come off from the elastic support members 80, 80. Always stator 1
If a magnetic force pulling to the 0 side is applied, the mover 50 will not come off from the elastic support members 80, 80 even if a strong impact is applied. Therefore, the tapered surface is provided as described above.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and drawings. Can be modified. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the functions and effects of the present invention are exhibited.

That is, the shapes, structures, and materials of the parts constituting each member such as the stator 10, the mover 50, and the elastic support member 80 can be variously modified. For example, the weight 60 and the permanent magnet 70
The shape of the permanent magnet 70 is such that when the permanent magnet 70 is housed in the housing portion 61 of the weight 60 and attracted to the lower surface of the mover yoke 51.
Any shape structure may be used as long as the mounting position with respect to the mover yoke 51 is such that the weight 60 positions it. Further, the shape and structure of the fitting portion 63 provided on the weight 60 may be any shape and structure according to the shape and structure of the mover yoke 51 as long as they can be positioned on the mover yoke 51. Further, it goes without saying that the vibration generator according to the present invention is not limited to being used in a mobile device, and can be applied to any device as long as it is desired to generate vibration.

[0048]

As described in detail above, the present invention has the following excellent effects. Since the permanent magnet is attached to the surface of the mover yoke on the side facing the stator, and the weight is attached to the position surrounding the permanent magnet of the mover yoke, a vibration generator is provided as compared with the case where the weight is attached to the upper surface of the mover. The overall size and thickness can be reduced.

Since one magnetic pole surface of the permanent magnet is opposed to the stator side, the mover can be constructed with one permanent magnet in good balance.

By installing one magnetic pole surface of the permanent magnet so as to face the outer peripheral side surface of the coil, the magnetic flux emitted from the magnetic pole surface of the permanent magnet enters the coil through the outer peripheral side surface of the coil and is fixed by the coil. Since a magnetic path is formed that is directed so as to face the magnetization direction of the child, the thrust of Fleming's law is applied in addition to the thrust of the electromagnetic force of the coil when a current is applied to the coil, and the overall thrust of the mover is driven. Will increase.

Since the weight is provided with an accommodating portion having a shape in which the permanent magnet is accommodated and the accommodated permanent magnet is attracted to the mover yoke, the weight is also fixed to the mover yoke. Even if it is formed, the weight and the permanent magnet can be easily fixed to the mover yoke by the magnetic force of the permanent magnet without using a separate adhesive or the like, and the mover can be easily assembled.

Further, the weight is provided with a fitting portion for positioning with respect to the mover yoke, and when the permanent magnet is accommodated in the accommodating portion of the weight and attracted to the mover yoke, the mounting position of the permanent magnet with respect to the mover yoke is the weight. If the weight is fixed to the mover yoke, the permanent magnets can be positioned and fixed at the same time, and the mover can be easily assembled.

Since arm portions extending toward the stator side are provided on both sides of the mover, and the inner side surfaces of the arm portions are opposed to both end surfaces of the stator with predetermined gaps, respectively, The center of gravity of the mover is low and the shape of the left and right is stable and the vibration is stable.

[Brief description of drawings]

FIG. 1 is a perspective view showing a vibration generator 1 according to an embodiment of the present invention.

2 (a) is a front view of the vibration generator 1, FIG.
(B) is a side view.

FIG. 3 is an exploded perspective view of the vibration generator 1.

FIG. 4 is a perspective view of terminal plates 23, 23.

FIG. 5 is a perspective view of the base unit with terminal 20 viewed from the back surface side.

FIG. 6 is an exploded perspective view of a mover 50.

7 is a cross-sectional view taken along the line AA of the weight 60 shown in FIG.

8 is a cross-sectional view of the same portion as that of FIG. 7 of a mover 50.

9 is a diagram showing a positional relationship between a stator 10 and a mover 50. FIG.

FIG. 10 is a view showing a fixing structure of an elastic support member 80.

11 (a) and 11 (b) are explanatory views of the reason why the center yoke 75 is attached to the permanent magnet 70. FIG.

12 is a diagram showing the relationship between the displacement of the mover 50 and the thrust acting on the mover 50. FIG.

FIG. 13 is a thrust and elastic support member 8 by a permanent magnet 70.
It is a figure which shows the relationship between thrust and displacement by 0,80.

FIG. 14 is a diagram showing a relationship of forces acting on a mover 50.

FIG. 15 is a diagram showing a relationship of forces acting on a coil 33 according to Fleming's law.

FIG. 16 is a perspective view showing a conventional vibration generator 100.

[Explanation of symbols]

1 Vibration generator 10 Stator Base with 20 terminals 21 base unit 217 Spring end fixing part 219 Spring locking part 23 Terminal board 231 connection 233 terminal 28 Gap 30 core coil 31 coil core 33 coils 37 Edge 40 elastic body 50 mover 51 Mover yoke 52 Arm 53 End face 55 Locking part 60 weights 61 Storage 63 Fitting part 70 Permanent magnet 75 Center York 80 Elastic support member

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Katsuhito Matsuhiro Katsuhito Matsuhiro, 335 Karijuku, Nakahara-ku, Kawasaki City, Kanagawa Imperial Telecommunications Industry Co., Ltd. (72) Haruo Ito 335, Kakujuku, Nakahara-ku, Kanagawa Kogyo Co., Ltd. (56) Reference JP-A-2000-156964 (JP, A) Special Table 7-500478 (JP, A) US Patent 3135880 (US, A) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) B06B 1 / 04,1 / 14 H02K 33/16 H04M 1/00

Claims (5)

(57) [Claims] 1. A permanent magnet is attached to a mover yoke.
Mover, An end face that faces the end face of the mover with a predetermined gap.
And have a coil attached to it and apply current to it to excite it.
And a stator that forms a magnetic path with the mover, Possible by attaching one end to the mover side and the other end to the stator side
Oscillator can be oscillated in the direction of magnetization of the stator by the coil
An elastic support member for supportingMount a weight on the surface of the mover yoke that faces the stator.
Attach With the permanent magnet housed in the housing provided on the weight
The surface of this permanent magnet facing the stator of the mover yoke
Vibration generator characterized by being attached to. 2. A magnetic flux emitted from the magnetic pole surface of the permanent magnet is passed through the outer peripheral side surface of the coil so that one magnetic pole surface of the permanent magnet faces the outer peripheral side surface of the coil attached to the stator. 2. The vibration generator according to claim 1, wherein a magnetic path is formed so as to be guided in a direction of magnetization of the stator by the coil after entering the inside. 3. The accommodating portion provided on the weight has a shape for accommodating the permanent magnet and fixing the accommodating permanent magnet to the mover yoke so that the weight is also fixed to the mover yoke. The vibration generator according to claim 1 or 2. 4. A mover yoke of a permanent magnet when the weight is provided with a fitting portion for positioning with respect to the mover yoke, when the permanent magnet is housed in the containing portion of the weight and attached to the mover yoke. The vibration generator according to claim 3, wherein a mounting position for the is determined by a weight. 5. The mover yoke is provided with arms extending toward the stator on both sides of the mover yoke, and inner surfaces of the arms are shaped to face both end faces of the stator with predetermined gaps, respectively. 5. The vibration generator according to claim 4, wherein the fitting portion of the weight is formed in a shape to be positioned in a portion between both arm portions of the mover yoke.