JP2002143770A - Vibration generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration generator which can be made thin and small- sized even when a dead weight is attached thereto and of which the movable piece can be easily assembled. SOLUTION: A movable piece 50, which is freely oscillably supported on a stator by two coil springs, is constructed by attaching a permanent magnet 70 and a dead weight 60 to a movable piece yoke 51. In the weight 60, a receiving section 61 and a fitting section 63 are formed. The receiving section 61 has such a shape that it receives the magnet 70 and that the weight 60 is fixed to the yoke 51 by causing the magnet 70 to attract the yoke 51. The fitting section 63 determines the positions of the weight 60 to the yoke 51.

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, a portable device such as a portable telephone, which is a terminal of a mobile communication device, has a vibration generator housed in the portable device itself or in an accessory of the portable device instead of notifying the incoming call by a ringing tone. In some cases, the vibration generator causes the human body to sense an incoming call by vibrating the vibration generator.

In this type of conventional vibration generator, a rotating body is mounted on a rotating shaft of a motor, and at that time, the center of gravity of the rotating body is set at a position different from the rotating shaft, and the rotating body is rotated. Some have structures that generate vibration.

However, since the vibration generator having such a structure utilizes the vibration of the rotating shaft when rotating the rotating body as vibration, the bearing portion of the rotating shaft of the motor receives severe force, and its durability is increased. And the problem of hindering reliability.

Accordingly, the applicant of the present application has filed an earlier
00-156964), as shown in FIG.
The mover yokes 134, 135 are provided on both end faces of the permanent magnet 136.
And a stator 11 in which a coil 140 is wound around a central yoke 115 provided in a stator yoke 113.
0, and coil springs 150, 150 pivotally supporting the mover 130 with respect to the stator 110, and 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 by number.

Here, the weight 138 is attached to the mover 130 in the above conventional example for the following reason. 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
The mass of the entire member (for example, a portable device) to which is attached is M,
Assuming that the speed is V, there is a relationship 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 movable element 130, the height of the entire movable element 130 is increased. There is a problem that the thickness cannot be reduced. The weight 138 is the vibration generator 1
Due to the structure of No. 00, there is no place to attach it to the side or bottom surface of the mover 130.

The weight 138 is desirably formed of a non-magnetic material so as not to form a magnetic path in the weight 138. However, in this case, the weight 138 is not attracted to the permanent magnet 136 by magnetic force.
Such as having to be fixed separately with adhesive, etc.
The assembly was complicated.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to reduce the size and thickness of the entire vibration generator even if a weight is attached, and to provide a movable element. Another object of the present invention is to provide a vibration generator that can be easily assembled.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a vibration generator according to the present invention comprises a movable element having a permanent magnet mounted on a movable element yoke and a predetermined gap with respect to an end face of the movable element. A stator having a magnetic path formed between the movable element and the stator by passing a current through the mounted coil to excite the coil, one end of which is on the movable element side, and the other end of which is on the stator side. An elastic support member that supports the mover by vibrating the mover in the direction of magnetization of the stator by the coil, and the permanent magnet is mounted on a surface of the mover yoke facing the stator, A weight is attached at a position surrounding the permanent magnet attached to the mover yoke.

Further, by installing 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 emitted from the magnetic pole surface of the permanent magnet passes through the outer peripheral side surface of the coil and is formed inside the coil. , And a magnetic path is formed to be guided by the coil so as to be directed to the magnetization direction of the stator.

In the present invention, the weight may be provided with a storage portion in which the permanent magnet is housed and the housed permanent magnet is attached to the mover yoke so that the weight is also fixed to the mover yoke. Features.

[0013] Further, the present invention provides the weight by providing a fitting portion for positioning to the mover yoke, so that when the permanent magnet is housed in the storage portion of the weight and mounted on the mover yoke, The mounting position with respect to the mover yoke is determined by the weight.

Further, according to the present invention, the armatures extending toward the stator are provided on both sides of the mover yoke, and the inner surface of the arm is opposed to both end surfaces of the stator via predetermined gaps. On the other hand, the fitting portion of the weight is formed so as to be positioned at a portion between both arms of the mover yoke.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a vibration generator 1 according to one embodiment of the present invention, FIG.
FIG. 2B is a side view, and FIG. 3 is an exploded perspective view. As shown in these figures, the vibration generator 1 is configured such that the movable element 50 is supported on the upper part of the stator 10 by two elastic support members 80, 80. Hereinafter, each component will be described.

As shown in FIG. 3, the stator 10 comprises a cored 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 formed by molding a base body 21 made of a plate-like synthetic resin material around two metal terminal plates 23 shown in FIG. 4 as shown in FIG. And both terminal boards 2
The connecting portions 231 and 231 provided at the centers of the bases 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 the terminals 23 and 23 are connected to the base body as shown in FIG. 21 is exposed on the lower surface. On the upper surface of the base body 21, elastic body mounting portions 211 and 211 are provided on both left and right sides thereof, and a concave storage portion 213 for storing the cored coil 30 is provided between the two. Stand body 2
Two spring end fixing portions 217 and 217 each having a small hole are provided at the center of the upper surface in the vicinity of both sides 215 and 215, respectively, and the spring end fixing portions 217 and 217 near the both sides 215 and 215 are provided. Are provided on both sides with spring locking portions 219, 219, respectively.

The cored coil 30 is constructed by winding a coil 33 around a substantially rod-shaped coil core 31 and extending coil ends 35 from both ends of the coil core 31. Here, the coil core 31 is formed of an iron sintered body in a substantially rectangular column shape, and the end faces 37, 37 at both ends thereof as shown in FIG.
The first end faces 53, 53 are tapered so as to have substantially the same inclination angle as the end faces 53, 53 so as to be parallel to the end faces 53, 53.

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

The stator 10 is assembled by storing the cored coil 30 in the storage portion 213 of the terminal base 20 and fixing it with an adhesive or the like.
5 is exposed on the upper surface of the base unit 20 with terminals.
1 and 231 are connected and fixed by various fixing means such as a low melting point metal, a conductive adhesive and welding, respectively, and the elastic members 40 and 40 are respectively attached to the elastic member mounting portions 211 and 211 of the base unit 20 with terminals. It is performed by placing. The stator 10 has terminal portions 233 and 233 of both terminals 23 and 23.
Is exposed to the lower surface of the base body 21, so that a low-melting-point metal can be directly attached to a circuit pattern on a substrate on which the vibration generator 1 is to be attached by reflow or the like. I have.

Next, as shown in FIGS. 1 to 3, each of the elastic supporting members 80, 80 is a so-called double torsion coil spring formed by bending a single wire, and is wound about one and a half turns. Two coil parts 8
Two substantially parallel arm portions 83 and 83 and arm portions 85 and 85 project from both sides of each of the arm portions 1 and 81, and the arm portions 83 and 83 extending in one direction are connected by a connecting portion 82, and the other. The arm portions 85, 85 are bent at their distal ends to form locking end portions 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 has an arm 5 at each end extending toward the stator 10.
2, 52 are provided, and are formed in a substantially “U” shape as a whole,
The inner surfaces of the arms 52, 52 are connected to the end surfaces 3 of the coil core 31.
L, which are tapered end faces 53 facing each other with a predetermined gap therebetween, and which lock the connecting portions 82 of the elastic support members 80 on both outer side surfaces of the arms 52, 52. Locking portions 55 and 5 formed of cutouts bent in a letter shape
5 is provided.

The weight 60 is made of a non-magnetic material (for example, a molding die containing a non-magnetic heavy metal powder such as tungsten in a molding resin such as nylon) in order to prevent a magnetic path from being formed in the weight 60 portion. It is constituted by. Here, FIG. 7 is a sectional view of the weight 60 shown in FIG. As shown in FIGS. 6 and 7, a storage part 61 in which a permanent magnet 70 is fitted is provided at the center of the weight 60, and a concave part is recessed at an upper part of the storage part 61, and the lower surface and the side surface of the movable element yoke 51 are provided. Is provided with a fitting portion 63 having a size and a shape that fits into the fitting portion 63. That is, the fitting portion 6
3 has a width substantially equal to the width of the mover yoke 51, and the length of the weight 60 in the vibration direction
The fitting portion 63 of the weight 60 is attached to a portion between the arms 52 of the mover yoke 51. When
The weight 60 is configured to be correctly positioned on the mover yoke 51. Notches 65 are provided at four corners of the lower surface of the weight 60. The notch 65 is provided when the movable member 50 vibrates.
Is to prevent collision with the weight 60. Further, as shown in FIG.
The width k) of the direction perpendicular to the vibration direction is slightly larger than the width of the fitting portion 63 and the step portion 68 is provided.
The width is substantially the same as that of the permanent magnet 70. The height of the storage portion 61 is substantially the same as the thickness of the permanent magnet 70.

Next, the permanent magnet 70 is a square plate member, and its upper and lower surfaces are configured as SN magnetic poles. The size of the surface of the permanent magnet 70 in the vertical and horizontal directions is substantially the same as the size of the upper surface of the coil 33 in the vertical and horizontal directions.
Is formed so as to cover the upper surface of the.

The center yoke 75 is a thin rectangular plate member. The length L1 of the movable element 50 in the vibration direction is the same as the length of the permanent magnet 70 in the same direction.
The length L2 in the direction perpendicular to the zero vibration direction is the same as the length of the weight 60 in the same direction. The material of the center yoke 75 is, for example, pure iron or the like in order to collect magnetic flux.

The mover 50 is assembled by inserting the permanent magnet 70 into the storage 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. Is carried out by attaching a center yoke 75. FIG. 8 is a sectional view of the same part as that of 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 is
The weight 60 is also fixed to the mover yoke 51 by engaging with the armature 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 or the like, and the members can be manufactured simply by combining them. The weight 60 is positioned with respect to the mover yoke 51 by the fitting portion 63, the permanent magnet 70 is positioned by the storage portion 61, and the center of the center yoke 75 is the center of the surface of the permanent magnet 70. Therefore, the members can be positioned automatically by simply combining them without paying special attention to 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 cored coil 30 and the elastic members 40, 40 are attached. Insert the locking ends 87, 87,
At the same time, the respective arm portions 85 of the elastic support members 80, 80 are locked to the spring locking portions 219 of the stator 10. Thus, the locking end portions 87, 87 of the elastic support members 80, 80 and the arm portions 8
5 is fixed, the coil portions 81, 81
The elastic support members 80, 80 are securely supported at three points by being slightly pressed against the coil mounting portions 401, 401. Then, the vibration generator 1 shown in FIGS. 1 and 2 is completed by inserting and locking the connecting portions 82, 82 of the elastic support members 80, 80 to the locking portions 55, 55 of the mover 50.

FIG. 9 is a diagram showing a positional relationship between the stator 10 and the mover 50 of the vibration generator 1. As shown in the figure, both end faces 37 of the stator 10 are
The opposing surfaces are configured to be parallel to each other through predetermined gaps 28, 28 (both left and right gap dimensions are the same) with respect to 53. The mover 50 includes elastic support members 80, 80.
Accordingly, the stator 10 is supported so as to be able to vibrate freely in the magnetization direction of the stator 10 by the coil 33 (that is, in 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 disposed via the gap 27 so as to oppose the outer peripheral side surface of the coil 33, and this opposing surface is configured to be parallel.

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

The vibration generator 1 is mounted on a circuit board (not shown), and the terminal section 233 of the base section 20 with terminals is brought into contact with a circuit pattern (terminal pattern) provided on the circuit board to lower the vibration generator. It is electrically and mechanically connected and fixed with a melting point metal or the like. Then, the coil 33 from the circuit board side (not shown)
When a predetermined current is supplied to the movable element 50, the mover 50 starts a simple oscillation right and left. Hereinafter, the operation principle will be described.

FIG. 12 is a diagram showing the relationship between the displacement x (mm) of the mover 50 to the left and right and the thrust F (N) acting on the mover 50 in the left and right direction. The positive value of the thrust F indicates the rightward force in FIG. 9, and the negative value indicates the leftward force in FIG. In addition, the positive displacement x indicates a rightward displacement in FIG. 9, and the negative displacement indicates a leftward displacement in FIG. 9. In this embodiment, the dimensions of the gaps 28 (in the horizontal direction)
Is 1.5 mm each.

The circular points indicate the resultant state of the magnetic force of the permanent magnet 70 that does not allow current to flow through the coil 33 and the resilience of the elastic support members 80, 80.
Indicates the state of the resultant force obtained by adding the magnetic force of the permanent magnet 70 and the resilient force of the elastic support members 80 and 80 to the electromagnetic force when a current of NI = + 100 (AT) is applied to the coil 33. When a current of NI = −100 (AT) is applied to the magnetic force of the permanent magnet 70 and the elastic support member 8.
It shows the state of the resultant force obtained by summing the resiliency of 0,80.

As shown in the figure, in any state, the thrust applied to the mover 50 is substantially linear, indicating that the mover 50 is in a state suitable for simple oscillation. ing. The reason for such thrust is as follows.

That is, as shown by the line a in FIG. 13, the thrust by only the elastic support members 80, 80 is a force for linearly returning 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 by only the permanent magnet 70 is a thrust in the opposite direction to the thrust of the elastic support members 80, 80. However, when the displacement is small, it hardly works, and the displacement increases. When any of the left and right gaps 28, 28 becomes smaller, the gap 28 rapidly increases toward the smaller one. Therefore, when the two thrusts are combined, a substantially linear thrust is obtained as shown by a circular point in FIG. The permanent magnet 70
The reason that the thrust caused by only the force becomes as shown by the line b in FIG.
This is because both ends 53 of the mover 50 have S poles, so that when the mover 50 is in the neutral position, it is not attracted to either the left or right. However, either end face 53, 53
Is approaching one of the end faces 37, 37 of the stator 10, the thrust to be attracted to the end face increases exponentially. As described above, the thrust by the permanent magnet 70 alone is small near the neutral point. Therefore, even if the elastic force of the elastic support members 80 and 80 is not so large, the movable element 50 is moved to the neutral position when no current flows through the coil 33. Can be easily maintained.

The coil 33 has NI = + 100 (A
T), the left and right end faces 37, 37 of the stator 10
When the NS magnetic pole is excited, the thrust by the permanent magnet 70 and the elastic support members 80, 80 becomes a thrust in a state in which the thrust is moved in a substantially parallel upward direction with a predetermined width as it is, as shown in FIG. That is, at any displacement position, the thrust is larger by a substantially constant displacement than the thrust by the permanent magnet 70 and the elastic support members 80,80. When a current of NI = −100 AT flows, on the contrary, it moves substantially parallel downward.

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.
A repulsive force acts between the end faces 7 and 53, and an attractive force acts between the right end faces 37 and 53. Therefore, a thrust toward the left acts on the mover 50. On the other hand, as the mover 50 moves to the left, the suction force acting between the right end faces 37 and 53 increases, but the repulsive force acting between the left end faces 37 and 53 decreases. Therefore, the thrust for moving the mover 50 to the left as a whole is substantially constant at any position.

In the present invention, still another thrust works. 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.
Is guided into the coil 33 through the outer peripheral side surface of the coil 33 so as to face the NS magnetic pole direction of the coil 33 in the coil core 31. Therefore, when a current flows through the coil 33, FIG. 15 (FIG. 15 shows a state where 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. A current flows in the direction shown in FIG. 15). As shown in Fleming's law, a thrust on the upper side 331 of the coil 33 on the front side of the drawing (that is, rightward in FIG. 335 has no thrust and lower side 337
The thrust on the back side of the paper (that is, the leftward direction in FIG. 14) acts on the
Since the amount of magnetic flux passing through the lower side 337 is very small, a thrust directed rightward in FIG. Since the stator 10 is fixed, a thrust to the left direction 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 according to Fleming's law is applied in the same direction, so that the overall thrust for driving the mover 50 increases. When a current in the opposite direction flows through the coil 33, the thrust according to Fleming's law is also in the opposite direction. In 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 side surface of the coil 33, the magnetic flux can be concentrated on the magnetic pole surface and collected. It can be effectively guided inside through the outer peripheral side surface. Therefore, the thrust according to the Fleming's law increases.

Next, a method of driving the vibration generator 1 will be described. As shown in FIG. 9, when no current is flowing through the coil 33, the elastic support members 80, 80 maintain the mover 50 at the neutral position. Next, a current (NI = −100) is applied to the coil 33.
AT), the end faces 37, 37 of the coil core 31 are supplied.
The NS magnetic pole is excited as shown in FIG.
Are attracted toward the opposite end surface 37 (left direction). This is because the square point in FIG. 12 has a negative thrust at the displacement x = 0 mm. When the direction of the current supplied to the coil 33 is reversed (NI = + 100AT) when the right end face 53 of the mover 50 approaches the opposed end face 37, FIG.
In FIG. 2, the thrust is a triangular point, which is a thrust that pulls the mover 50 in the opposite direction (rightward direction), so that the mover 50 starts to move in the opposite direction.

The reversal of the current is repeated according to the vibration frequency of the mover 50, so that the mover 50 is moved immediately before the end faces 53, 53 of the mover 30 abut against the end faces 37, 37 of the stator 10. Is reversed (that is, the end face 37,
37 does not always contact the end faces 53, 53),
Zero vibration can be repeated.

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

A current is applied to the coil 33 to draw the mover 50 once 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 this vibration is attenuated, the operation of stopping the current again after supplying the current to the coil 30 to increase the amplitude of the mover 50 may be repeated. Also, the current may be supplied in a pulsed manner at other timings. With this configuration, power saving can be achieved.

In this embodiment, arms 52 are provided on both sides of the mover 50 and extend toward the stator.
The inner surfaces of the stators 2 and 52 are the end surfaces 53 and 53 facing the both end surfaces 37 and 37 of the stator 10 with a predetermined gap therebetween. And the vibration stabilizes.

FIG. 10 is a view showing a structure for fixing the elastic support member 80 to the base 20 with terminals. As shown in the figure, the elastic support member 80 has a portion at the locking end 87, a portion locked by the spring locking portion 219 of the arm portion 85, and a portion at which the coil portion 81 elastically contacts the elastic body 40. 3
Since it is supported at points, its fixation is secure. The end of the elastic support member 80 on the side of the arm 83 swings 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, whereby the end of the arm 83 side further increases the swing amount. To the position indicated by the dotted line b, whereby the swing stroke of the mover 50 is increased, and more effective vibration can be performed.

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 reasons. That is, when the thickness of the permanent magnet 70 is small as in this embodiment, the magnetic flux does not reach far, as shown in FIG. It does not enter, and wasteful things increase. Also, of the sides 70a to 70d of the permanent magnet 70, the opposite side 70
The lines of magnetic force passing over portions b and 70d rarely enter the coil core 31 and do not contribute to the vibration of the mover 50. Therefore, by providing a center yoke 75 as shown in FIG. 11B, the shortest distance between the NS magnetic poles is increased, thereby increasing the number of lines of magnetic force incident on the coil core 31, and the center yoke is larger than the width of the permanent magnet 70. 7
5 is increased to reduce the number of lines of magnetic force passing over the sides 70b and 70d to reduce the sides 70a and 70c.
By increasing the number of lines of magnetic force that pass through beyond the portion, the number of lines of magnetic force incident on the coil core 31 is increased, so that the lines of magnetic force of the permanent magnet 70 can be more effectively used for the vibration of the mover 50. It is.

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.
The reason why the inclined tapered surface is widened toward the side is as follows. That is, the magnetic flux has a property of flowing through the shortest distance portions of the gaps 28, 28. At the same time, the magnetic flux density must be reduced to avoid magnetic saturation. Therefore, the opposite end faces are made parallel so that the magnetic flux passes uniformly in the gap 28, and at the same time, the inclined face is used to increase the area of the face, thereby avoiding magnetic saturation and ensuring good vibration. It was made possible. Further, the tapered surface that is inclined so as to expand toward the stator 10 is configured as described above.
That is, in addition to the force in the direction in which the mover 50 is vibrated, the force in the direction of arrow F, that is, the force to draw the mover 50 toward the stator 10 acts. When a strong shock is applied to the vibration generator 1 such as by dropping a device to which the vibration generator 1 is attached, the heavy movable element 50 may come off the elastic support members 80, 80. Always stator 1
If a magnetic force pulling to the zero side is applied, there is no danger that the mover 50 will come off 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-described embodiments, and various modifications are possible within the scope of the claims and the technical idea described in the specification and the drawings. Is possible. 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 effects and effects of the present invention are exhibited.

That is, the shape, structure, and material of the components constituting each member such as the stator 10, the movable member 50, and the elastic support member 80 can be variously modified. For example, weight 60 and permanent magnet 70
When the permanent magnet 70 is housed in the housing portion 61 of the weight 60 and is attracted to the lower surface of the mover yoke 51, the shape of the permanent magnet 70
Any configuration may be used as long as the mounting position of the movable element yoke 51 is determined by the weight 60. 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 are positioned on the mover yoke 51. Further, the vibration generator according to the present invention is not limited to use in a portable device, and it goes without saying that the vibration generator can be applied to any device that wants to generate vibration.

[0048]

As described in detail above, the present invention has the following excellent effects. A permanent magnet is attached to the surface of the mover yoke facing the stator, and a weight is attached to the position surrounding the permanent magnet of the mover yoke. The overall size and thickness can be reduced.

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

By setting one of the magnetic pole surfaces of the permanent magnet so as to face the outer peripheral surface of the coil, the magnetic flux emitted from the magnetic pole surface of the permanent magnet enters the coil through the outer peripheral surface of the coil, and is fixed by the coil. Since a magnetic path is formed so as to be directed to the magnetization direction of the armature, when a current is applied to the coil, in addition to the thrust by the electromagnetic force of the coil, the thrust by Fleming's law is applied, and the overall thrust to drive the mover Increase.

The weight is provided with a storage portion in which the permanent magnet is housed and the housed permanent magnet is attracted to the mover yoke so that 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 an adhesive or the like (although it may be used), and the mover can be easily assembled.

Further, the weight is provided with a fitting portion for positioning to the mover yoke, and when the permanent magnet is housed in the storage portion of the weight and attracted to the mover yoke, the mounting position of the permanent magnet with respect to the mover yoke is changed to the weight. With such a configuration, the weight and the permanent magnet with respect to the mover yoke can be positioned and fixed at the same time, and the mover can be easily assembled.

Arms extending toward the stator are provided on both sides of the mover, and the inner surface of the arm is formed so as to face both end surfaces of the stator with predetermined gaps therebetween. The center of gravity of the mover is low and the shape of the left and right object becomes stable, and the vibration is stabilized.

[Brief description of the drawings]

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

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

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

FIG. 4 is a perspective view of the terminal boards 23;

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

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

FIG. 7 is a sectional view of the weight 60 shown in FIG.

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

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

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

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

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

FIG. 13 shows thrust and elastic support member 8 by 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 between forces acting on the mover 50.

FIG. 15 is a diagram showing a relationship between 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]

 DESCRIPTION OF SYMBOLS 1 Vibration generator 10 Stator 20 Base part with terminal 21 Base body 217 Spring end fixing part 219 Spring locking part 23 Terminal plate 231 Connection part 233 Terminal part 28 Gap 30 Coil with core 31 Coil core 33 Coil 37 End face 40 Elasticity Body 50 Mover 51 Mover yoke 52 Arm 53 End face 55 Locking part 60 Weight 61 Storage part 63 Fitting part 70 Permanent magnet 75 Center yoke 80 Elastic support member

Continuing on the front page (72) Inventor Naoki Fukuda 335 Karisuku, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Imperial Telecommunications Industry Co., Ltd. 72) Inventor Haruo Ito 335 Karuku, Nakahara-ku, Kawasaki-shi, Kanagawa F-term in Teikoku Communication Industry Co., Ltd. 5D107 AA02 AA12 AA13 BB08 CC09 DD03 DD12 5H633 BB07 BB08 GG02 GG04 GG09 HH05 HH25 JA02

Claims (5)

[Claims] 1. A movable element having a permanent magnet attached to a movable element yoke, and an end face opposed to an end face of the movable element via a predetermined gap, and a current is applied to the attached coil to excite the coil. A stator that forms a magnetic path with the mover, and one end is attached to the mover side and the other end is attached to the stator side so that the mover can be vibrated toward the magnetization direction of the stator by the coil. An elastic support member, wherein the permanent magnet is mounted on a surface of the mover yoke facing the stator, and a weight is mounted at a position surrounding the permanent magnet attached to the mover yoke. And vibration generator. 2. A magnetic flux emitted from a magnetic pole surface of a permanent magnet is provided through an outer circumferential surface of the coil by disposing one magnetic pole surface of the permanent magnet so as to face an outer circumferential surface of the coil attached to a stator. 2. A 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 a coil after being incident on the inside. 3. The weight has a storage portion in which the permanent magnet is housed and the housed permanent magnet is attached to the mover yoke so that the weight is also fixed to the mover yoke. The vibration generator according to claim 1 or 2, wherein 4. A movable yoke for a permanent magnet when the weight is provided with a fitting portion for positioning the movable magnet into a movable element yoke, and the permanent magnet is stored in a storage section for the weight and mounted on the movable element yoke. The vibration generator according to claim 3, wherein a mounting position with respect to is determined by a weight. 5. The mover yoke is provided with arms extending on both sides thereof toward the stator, and the inner surface of the arm is formed so as to face both end surfaces of the stator with a predetermined gap therebetween. The vibration generator according to claim 4, wherein the fitting portion of the weight is formed in a shape positioned at a portion between both arms of the mover yoke.