JPH0985169A - Vibration generator for silent alarm for portable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration generator of a silent calling mechanism good in vibration generation efficiency by providing a part with which an inertial member can come into contact at the almost maximum amplitude and the like of that member and also providing a part having elasticity on the contact member side or the inertial member side. SOLUTION: An elastomer resin projection 6 is provided on the position of a base 1 facing the nearly center part of an inner yoke 30b. The distance between the inner yoke 30b and the base 1 is smaller than the almost maximum amplitude downward of the inner yoke 30b as a part of an inertial member, and is within such a range that the inner yoke 30b can come into contact with the base 1. When an alternating current is applied to a coil 2, an alternating magnetic field is generated. Since the coil 2 approaches a permanent magnet 3, both of them repeat the approach and receding while resisting a plate spring 4 by Lorentz force to change the relative positions and vibrate at right angles to the plate spring 4. When the current is shut off, the plate spring 4 is in an effort to the original position, but hits against the projection 6 just before the permanent magnet restores the maximum amplitude and repulses in the reverse direction by the elastic force thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generating device having a silent calling mechanism, such as a small pager, which has a good vibration generating efficiency.

[0002]

2. Description of the Related Art In the conventional silent calling mechanism such as a pager, the one in which a weight portion is eccentrically attached to a rotating shaft of a motor is mainly used. It is well known that when a weight part is attached to the rotation shaft of a motor in an eccentric state, vibration (vibration) occurs when the motor rotates. For this reason, it is widely used as a vibration generating unit such as a pager.

Generally, a small motor for control is required to have a small moment of inertia in order to obtain a large starting torque, and attempts have been made to reduce the weight of the rotor and the turning radius. The cup-type coreless motor satisfies the above requirements, has no rotating iron core, and therefore has a small radius of the rotor (the cup formed by winding the armature coil). In addition, in a silent pager such as a small pager, a mechanism that is small and lightweight and that generates vibration of a size that can be felt is required.
For this reason, a cup-type coreless motor is used in a conventional pager silence calling mechanism.

However, the one using the cup type coreless motor for the silent calling mechanism of the pager has the following problems. That is, since the pager is carried in a pocket, the size and weight of the pager must be reduced as much as possible. However, no matter how small the cup-type coreless motor is, There is a limit as long as you have to configure. Further, since a battery is used, it is required that the power consumption is low, but there is a problem that the cup-type coreless motor consumes a large amount of power. In addition, the mechanical loss that occurs particularly in bearings and brushes is so large that it cannot be ignored. In the brush part, there are problems that electromagnetic noise is generated by sparks and that the brush is heavily worn and has a short life. Also, since the pager is generally put in a chest pocket or the like, it is desirable that the pager has a high notification effect when it vibrates in the chest direction (body direction), but in the first place, it is not attached to the motor with an eccentric weight part. However, there is a problem that the direction of vibration is not constant and thus the notification effect is low.

Further, in the vibration generating mechanism, it is extremely difficult to machine a small diameter hole for the motor rotation shaft insertion hole, that is, the core pin removal hole in the molding of the weight, and accurate press-fitting margin control is impossible in the first place. In order to control the accuracy of the press-fitting margin, it was necessary to rely on secondary processing such as the above-mentioned reamer processing. Also,
According to the method of crimping the punching hole, the dimension of the core pin punched on the weight side does not match the diameter of the rotating shaft of the motor in the first place, so the crimping of the weight fixes it to the rotating shaft of the motor. There was a very fatal problem for the motor, such as bending of the rotary shaft due to the tightening force.
In any case, in the conventional method of forming the vibration generating portion of the pager motor, the accurate dimensional accuracy of the punching hole cannot be obtained at one time, and some secondary processing is always required. For this reason, the productivity of the product was poor, and the cost of the product was high.

As described above, the manufacturing is difficult, the cost is high,
No further miniaturization and thinning, large power consumption,
As a solution to the problem that the mechanical loss is large, electromagnetic noise is generated by spark discharge, the device life is short, and the vibration direction cannot be limited to one direction, a silent alarm as shown in FIG. There is a vibration generator for.

In this device, a cylindrical coil 2 is provided at one end of a base 1 made of synthetic resin having a rectangular planar shape, and a rare earth magnet, for example, a circular permanent magnet 3 of samarium cobalt is used.
The metal leaf spring 4 having one end is fixed to the spacer 10 on the base 1 at the other end, and the permanent magnet 3 is
The vibration generator is inserted into the coil 2 so that it can be freely taken in and out of the coil 2. The permanent magnet 3 is fixed in a cup-shaped outer yoke 30a which is a magnetic path member, and a cylindrical inner yoke 30b having the same diameter is superposed on the permanent magnet 3, and the inner wall surface of the outer yoke 30a is overlapped. And a magnetic gap 3 between the permanent magnet 3 and the inner yoke 30b.
1 is formed, and the coil 2 is inserted in the magnetic gap 31 in a non-contact state so that the magnetic flux of the magnetic gap 31 can be crossed. The permanent magnet 3 is magnetized in a cylindrical axial direction. Due to the characteristics, it is preferable that this magnetization be performed after the yoke is assembled. Also, the yoke 30a
A vent hole 32 communicating with the magnetic gap 31 is opened in the. FIG. 10 shows a state in which electric power is supplied to the coil 2 and the permanent magnets 3 and the like are repelled in the upward arrow direction.

In the above structure, since the coil 2 and the permanent magnet 3 are integrally connected via the leaf spring 4 which is a vibrating plate, the leaf spring 4 is not distorted in the initial state. The relative position of the coil 2 and the permanent magnet 3 is fixed.
Here, when an alternating current of about 100 [Hz] is applied to the coil 2, an alternating magnetic field is generated in the coil 2.
And the permanent magnet 3 are close to each other, and the Lorentz force generated between them causes the two to repeatedly approach and separate while resisting the leaf spring 4 to change their relative positions. It vibrates in the direction perpendicular to the leaf spring 4 as described above. Next, when the current passed through the coil 2 is cut off, the vibrating leaf spring 4 tries to return to the original state, and the positional relationship between the coil 2 and the permanent magnet 3 returns to the initial state. In this embodiment, since the coil 2 is attached to the base 1 made of synthetic resin, it can be considered that the plate spring 4 side mainly vibrates. Also, during this vibration, the permanent magnet 3 and the yoke 3
Since the air in the magnetic gap 31 with 0a can freely move in and out using the vent hole 32, if the coil 2 compresses the air in this part like a piston and the vibration of the leaf spring 4 is hindered. It prevents such a situation.

[0009]

[Problems to be solved by the invention]
It has the following advantages. That is, unlike the case of using the conventional pager motor, the structure is simple, so that the manufacturing is easy and the cost is low. In addition, the overall size is very thin and small, and only Lorentz force is generated between the coil 2 and the permanent magnet 3, and since the elastic force of the leaf spring 4 can be utilized, power consumption is reduced. small. Further, since there is no bearing or brush, there is almost no mechanical loss, and electromagnetic noise is hardly generated. There are no rotating parts or brushes to wear, increasing product life. Further, since it vibrates only in one direction at a right angle to the leaf spring 4, it can be efficiently notified by facing the body in this direction, and the permanent magnet 3 which is relatively heavy on the leaf spring 4 side. Since, is attached, a sufficiently large vibration can be obtained. In particular, when the samarium-cobalt permanent magnet 3 is used as in this embodiment, the inertial force of the inertial member can be increased.

However, it is desired that the silent calling mechanism for a portable device such as a pager has a higher vibration generation efficiency and a higher power saving effect. The present invention solves such a problem.

[0011]

SUMMARY OF THE INVENTION The above-mentioned problems are, in an electromotive force generating mechanism based on an electromechanical conversion system, an inertia member constituting the vibrating force generating mechanism is attached to a base via a vibrating member. A vibration generating device for a silent alarm comprising: a part where the inertial member can come into contact with, within the distance range of the inertial member substantially smaller than or equal to the maximum amplitude, and the contacting member side or the inertial member side. This is achieved by providing a vibration generating device for a silent alarm for a portable device, which is characterized in that a region having elasticity is provided.

According to a second aspect of the present invention, in the structure according to the first aspect, the vibration generating mechanism includes a coil provided on the base side, and a vibration member on the base opposite to the coil. And an inertia member mainly composed of permanent magnets connected together,
The inertial member includes a permanent magnet and a magnetic path member, has a magnetic gap between the permanent magnet and the magnetic path member, and is in non-contact with the magnetic gap so as to intersect the magnetic flux of the magnetic gap. In this state, the coil is inserted, and the inertia member and the coil are connected via a vibrating member so as to generate a vibration by relatively swinging when the coil is energized. It is characterized in that an area where the inertial member can contact is provided, and an elastic area is provided on the contacting member side or the inertial member side within the distance range of the amplitude or less.

According to a third aspect of the present invention, in the structure according to the second aspect, a housing in which a portion with which the inertial member can contact contains a vibration generating device for a silent alarm including an inertial member, a coil, and a vibrating member. Characterized by being a body.

The invention according to claim 4 is characterized in that, in the structure according to claim 2, the elastic portion is an elastic body attached to the inertia member.

The invention according to a fifth aspect is characterized in that, in the configuration according to the second aspect, the elastic portion is an elastic body attached to the vibrating member on the inertia member side.

The invention according to claim 6 is characterized in that, in the structure according to claim 2, the elastic portion is an elastic body mounted inside the housing.

The invention according to claim 7 is characterized in that, in the structure according to claim 2, the housing is configured to have elasticity, and the elastic portion is the housing wall surface itself. There is.

Some embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments.

[0019]

1 and 2 show a first embodiment of the present invention, in which a cylindrical coil 2 is provided at one end of a base 1 made of synthetic resin having a rectangular planar shape and the other end is provided. Spacer 10
Is provided, a metal leaf spring 4 having a rare earth magnet, for example, a circular permanent magnet 3 of samarium-cobalt 3 at one end is fixed to the spacer 10 at the other end, and the permanent magnet 3 can be freely inserted into and removed from the coil 2. The vibration generating device is configured by inserting the coil 2 into the coil 2 so as to be formed. The permanent magnet 3 is fixed in a cup-shaped outer yoke 30a which is a magnetic path member, and a cylindrical inner yoke 30b having the same diameter is superposed on the permanent magnet 3 and the inner wall surface of the outer yoke 30a is overlapped. A magnetic gap 31 is formed between the permanent magnet 3 and the inner yoke 30b so that the coil 2 can be inserted into the magnetic gap 31 in a non-contact state so as to cross the magnetic flux of the magnetic gap 31. It is configured. The permanent magnet 3 is magnetized in a cylindrical axial direction. Due to the characteristics, it is preferable that this magnetization be performed after the yoke is assembled. Further, a vent hole 32 communicating with the magnetic gap 31 is formed in the outer yoke 30a. Reference numeral 5 in the drawing is a screw for fixing the leaf spring 4 to the spacer 10. Reference numeral 1a is an IC for driving the coil 2, 2a is a lead wire for wiring from the IC to the coil 2, and 2b is a terminal for supplying electric power to the IC from the outside.

In the above structure, since the coil 2 and the permanent magnet 3 are integrally connected via the leaf spring 4 which is a vibrating plate, the leaf spring 4 is not distorted in the initial state. The relative position of the coil 2 and the permanent magnet 3 is fixed.
Here, when an alternating current of about 100 [Hz] is applied to the coil 2, an alternating magnetic field is generated in the coil 2.
And the permanent magnet 3 are close to each other, and the Lorentz force generated between them causes the two to repeatedly approach and separate while resisting the leaf spring 4, and the relative position changes, and the direction perpendicular to the leaf spring 4 is obtained. Vibrate to. Then, when the current flowing through the coil 2 is cut off, the vibrating leaf spring 4 tries to return to its original state.
The positional relationship between the coil 2 and the permanent magnet 3 is coupled with returning to the initial state. In the present embodiment, since the coil 2 is attached to the large-mass base 1 made of synthetic resin, it can be considered that it is the leaf spring 4 side that mainly vibrates. Further, during this vibration, the magnetic gap 3 between the permanent magnet 3 and the yoke 30a is generated.
Since the air in 1 can freely move in and out using the vent hole 32, the coil 2 compresses the air in this part like a piston and the vibration of the leaf spring 4 is hindered. To prevent.

In this embodiment, as is clear from the drawings,
Unlike the conventional case where a pager motor is used, the structure is simple, so that the manufacturing is easy and the cost is low.
Moreover, the overall size is very thin, the size is small, and only the Lorentz force is generated between the coil 2 and the permanent magnet 3, and the elastic force of the leaf spring 4 can be utilized. Is small. Further, since there is no bearing or brush, there is almost no mechanical loss, and electromagnetic noise is hardly generated. There are no rotating parts or brushes to wear, increasing product life. Also, since it vibrates only in one direction at a right angle to the leaf spring 4, by facing the body in this direction,
Since the notification can be made efficiently, and since the relatively heavy permanent magnet 3 is attached to the movable portion side which is swingably supported by the leaf spring 4, the sensible vibration can be sufficiently large. . In particular, when the samarium-cobalt permanent magnet 3 is used as in this embodiment, the inertial force of the inertial member can be increased.

In this embodiment, an elastomer resin protrusion 6 is provided on the base 1 facing the substantially central portion of the inner yoke 30b. The distance between the inner yoke 30b and the base 1 is as follows:
The range is smaller than the substantially maximum amplitude downward, and an elastomer resin protrusion 6 is provided on the base 1 facing the inner yoke 30b as a portion with which the inner yoke 30b can contact. Since the vibration of the inertia member is performed around the spacer 10 as a fulcrum and is not a complete vertical movement, the elastomer is placed on the base 1 opposite to a position slightly leftward from the substantially central portion of the inner yoke 30b. The resin protrusion 6 may be provided. That is, it does not necessarily have to be at the center of gravity of the inertia member.

As described above, when an alternating current is applied to the coil 2, an alternating magnetic field is generated in the coil 2, but the coil 2 and the permanent magnet 3 are close to each other, and the Lorentz force generated between the two causes the leaf springs to move therebetween. When the coil spring 2 vibrates in the direction perpendicular to the leaf spring 4 by repeatedly approaching and separating while resisting 4, it vibrates in the direction perpendicular to the leaf spring 4. Coil 2 to return to the state of
The positional relationship between and the permanent magnet 3 returns to the initial state. However, in the first embodiment, immediately before the maximum amplitude is reached on the permanent magnet 3 side, it collides with the elastomer resin projection 6 having a large coefficient of restitution on the base 1, and due to the elastic force of the elastomer resin projection 6, the reverse direction (in the figure) It is characterized in that it is repelled in the upward direction. At this time, the elastomer resin projections 6 give a force to the vibration on the permanent magnet 3 side in an auxiliary and positive manner. For this reason, it is desirable to select an elastic body such as the elastomer resin protrusion 6 that has the smallest internal loss. On the other hand, it is desirable that the side on which the elastomer resin projection 6 collides is hard, and it is preferable to use a proper material or to reinforce it.

FIG. 9 is a chart for explaining the relationship between the input power and the amplitude. Assuming that the elastomer resin protrusion 6 is not present, the permanent magnet 3 side applies the input power from the stopped state A to the point D. Although it reaches the maximum amplitude here, in the case of the present embodiment, the input power is changed from the stopped state A to P1.
In addition, when the point B is reached, the permanent magnet 3 side collides with the elastomer resin protrusion 6 having a large coefficient of repulsion and is accelerated and repulsed. Since this repulsive force is utilized, even if the input power is subsequently reduced to P2 at point C, the vibration motion is assisted by the action of collision repulsion, and the state of point B = point C can be maintained without the amplitude decreasing. You can do it. Originally, if the input power is P2, the amplitude should reach the point E only. Therefore, the state of vibrating near the point C is the most efficient state and the loss of kinetic energy is small. If the amplitude drops to point E due to some adjustment, the input power may be added again to P1 and then the input power may be reduced to P2. The point E can be automatically monitored or a method of procramming using a timer can be used. As a result, it is possible to reduce the input power to almost half.

[0025]

[Other Embodiments] Next, a second embodiment of the present invention will be described with reference to FIG.
4 and FIG. 4, the present embodiment has a parallel four-bar link structure as a vibration supporting member for vibrating the circular permanent magnet 3 of samarium cobalt, the outer yoke 30a, and the inner yoke 30b, which corresponds to a rotating pair. It is characterized in that the connecting portion 4'of the location is provided on the leaf spring 4 as shown in FIG. That is, the substantially T-shaped portion of the outer yoke 30a is sandwiched between two upper and lower substantially rectangular leaf springs 4a and 4b, and the knot forming plate 40b is covered on the top of the outer yoke 30a and fastened with the screw 5. Further, the outer yoke 30a has a circular cup shape opened downward, and a circular magnetic gap 31 for inserting the coil 2 from below is provided. Inside the magnetic gap 31, a permanent magnet 3 of samarium cobalt having a diameter smaller than that of the coil 2 is attached. A cylindrical inner yoke 30b having the same diameter is superposed on the lower surface portion of the permanent magnet 3. In addition, the substantially square-shaped leaf spring 4
Both side portions of a and 4b are sandwiched between the node forming plates 40a and 40c and fastened with the screw 5. On the other hand, as shown in FIG. 4, the substantially square-shaped leaf springs 4a and 4b on the side of the base 1 are composed of the node forming plate 40b, the spacer 10 and one end of the rectangular synthetic resin base 1. It is clamped and fastened with the screw 5. In this way, two sets of parallel four-joint links, that is, 4'-1, 4'-2, in which the exposed portions of the leaf springs 4a, 4b on both ends of the knot forming plate 40a are turned into a connecting portion 4'corresponding to a pair, The permanent magnet 3, which is an inertial movable body, and the yoke 30 are composed of 4'-3, 4'-4 sets and 4'-11, 4'-12, 4'-13, 4'-14 sets.
The structure is such that a and 30b are supported. A cylindrical coil 2 is provided at the center of the base 1 and is inserted into the magnetic gap 31. In FIG. 4, the driving IC 1 is provided in the base 1.
a is molded, and its power supply terminal 2b is formed so as to be exposed to the outside from the tail end of the base 1.

The diaphragm connecting the coil and the permanent magnet is 1
The number of sheets is not limited to two, and two may be used above and below, and the shape thereof is arbitrary, and it is also preferable to form a parallel four-bar link as shown in this embodiment. The parallel four-node link structure has a feature that the magnetic gap 31 portion constantly moves in parallel and there is little concern that it will come into contact with the coil 2, so that the width of the magnetic gap 31 can be set to a minimum. Also in the present embodiment, the thinning and the miniaturization are realized.

In the above-described first embodiment, the elastomer resin protrusion 6 is provided on the base 1 (the base 1 is a solution means, and is a housing as a portion to which an inertial member can come into contact. May be considered a part of). Moreover, the elastomer resin protrusion 6 was only at one location (one side) on the base 1 side. On the other hand, the present embodiment is characterized in that the elastomer resin protrusions 6 are provided on the inertia member side and at two positions, that is, the outer yoke 30a and the inner yoke 30b as a part of the inertia member. The upper side is the inner wall surface of the casing 7 with which the elastomer resin protrusion 6 collides,
The lower one is the upper surface of the base 1, and the upper outer yoke 30 is
The distance between a and the inner wall surface of the housing 7 is within a range smaller than the substantially maximum amplitude of the inertial member upward, and the distance between the inner yoke 30b and the surface of the base 1 is equal to that of the inertial member. The range is smaller than the substantially maximum amplitude downward.

In the present embodiment, since the parallel four-bar link structure is employed, the magnetic gap 31 is constantly moved in parallel, and the elastomer resin protrusion 6 provided at the substantially central portion of the inertia member is vertical without changing its posture. When it moves toward the bottom, it collides with the inner wall surface of the housing 7 and the upper surface of the base 1 alternately, and efficiently oscillates to realize a high power saving effect.

[0029]

[Other Embodiments] Next, a third embodiment of the present invention will be described with reference to FIG.
And FIG. 6 will be described. This embodiment is based on the structure of the first embodiment described above, except that the portion where the inertial member can contact is the inner wall surface of the housing 7, and the elastic portion is on the leaf spring 4 on the inertial member side. A portion having elasticity is provided as a leaf spring 61 formed on the leaf spring 4. That is, the length U is set in the portion of the leaf spring 4 near the outer yoke 30a.
The U-shaped cutout hole 60 is provided, and the long U-shaped cutout hole 60 is provided.
It is characterized in that a leaf spring 61 formed toward the right side of the drawing is provided on the inner side of. The leaf spring 61 is bent upward and is provided so as to collide with the inner wall surface of the housing 7. Although the leaf spring 61 is formed on the leaf spring 4 in this embodiment, the leaf spring 4 plays a role of a fulcrum is the spacer 10, and a firm fulcrum corresponding to this is provided on the leaf spring 61. In order to also provide the support plate 62 as shown by the chain line in FIG.
It is also preferable to attach it to the range up to a.

In the present embodiment, the leaf spring 61 collides against the inner wall surface of the housing 7 during vibration, and the elastic force of the leaf spring 61 repels the inertial portion, promoting the overall vibration. Two
It can reduce the input power to the device, and the vibration generation efficiency is good, and the power saving effect is high. As described above, since the fulcrum of the leaf spring 4 and the fulcrum of the leaf spring 61 exist in opposite directions to each other, the oscillating motion of the leaf spring 4 and the leaf spring 61 centered on both fulcrums causes the magnetic gap 31 to move. There is a tendency to try to translate even a little.

[0031]

[Other Embodiments] Next, a fourth embodiment of the present invention will be described with reference to FIG. The present embodiment is similar to the structure of the first embodiment described above, but a portion with which the inertia member can contact is the inner wall surface of the elastic casing 70, and the elastic casing 70 is made of thin steel material having a large coefficient of restitution. It is characterized in that an elastic projecting portion 71 is provided on the elastic casing 70 so as to project inward at the elastic portion.

In this embodiment, during vibration, the upper surface of the outer yoke 30a collides with the elastic protrusion 71 of the elastic casing 70 and is repelled, which promotes the overall vibration, and the input power to the coil 2 is correspondingly increased. It is reduced, the vibration generation efficiency is good, and the power saving effect is high.

Finally, a drive circuit suitable for the above-mentioned vibration generator will be described with reference to FIG. In FIG. 8, the coil 2 has a structure in which two coils are wound at the same time, and the first coil is used as the drive coil L1 and the other coil is used as the search coil L2. The drive circuit is basically incorporated in the IC 1a, and the IC 1a has two terminals T1 and T2, and a series circuit of a power supply V and a power switch SW is externally attached to the terminals T1 and T2. Also, IC
1a has four terminals T3, T4, T5, T6, and the above-mentioned drive coil L1 and search coil L2 are connected to these terminals, respectively. A backflow prevention diode D is connected in parallel to the search coil L2, and a series circuit of a capacitor C and a resistor R2 is connected to the input / output terminal of the amplification amplifier AMP for amplifying a minute search voltage. The non-inverting input terminal is connected to the ground side. The output of the amplification amplifier AMP is connected to the base terminal of the driving transistor Tr via the resistor R3, and the transistor T
The emitter of r is connected to the positive electrode of the power supply V via the terminal T1, and the collector of the transistor Tr is connected to the drive coil L1 via the terminal T6. Transistor Tr
A resistor R4 is connected between the base and collector of the.
The other end of the drive coil L1 is connected to the power switch SW from T2 and T4. According to this drive circuit, the vibration generator can start self-excited vibration due to the natural resonance frequency of the vibrating member, and continuously obtain vibration in the resonance state. Incidentally, as an example in which the above-mentioned drive circuit is not used, a mechanical switching mechanism such as a buzzer in which a contact is arranged at a vibrating portion can be used.

Since the present invention is not limited to the above-mentioned embodiments, when referring to an electromotive force generating mechanism based on an electromechanical conversion system, for example, a piezoelectric element, an electromagnet, etc. also belong to this category.

Further, for example, a contact plate provided separately in place of the base 1 or the housing 7 at a position where the inertial member can come into contact can be used, but the contact plate can be regarded as a part of the housing 7. . In the case where the maximum amplitude of the inertial member is within a distance range smaller than or equal to the maximum amplitude, in the configuration in which another leaf spring is provided at a portion where the leaf spring 61 of the third embodiment collides, this other leaf spring is an inertial member. May be considered to be the site itself that can contact. A coil spring can be used for the elastic portion. Further, the elastic portion can be provided on either one or both of the contact member side and the inertia member side, and the number thereof is not particularly limited. The shapes of the protrusions such as the elastomer resin protrusion 6 and the spring material such as the leaf spring 4 are also arbitrary. The rubber protrusions and the like can be hollow.

[0036]

As described above, according to the present invention, there is provided a vibrating force generating mechanism based on an electromechanical conversion system in order to provide a vibrating device of a silent calling mechanism having a good vibration generating efficiency. The inertia member constituting the inertial member is a vibration generating device for a silent alarm, which is attached to a base via a vibration member, and the inertial member comes into contact with the inertial member within a distance range of substantially the maximum amplitude or less. The vibration generating device for a silent alarm for a portable device is characterized in that a resilient portion is provided on the contact member side or the inertia member side as well as the obtaining portion. The member collides with the contact member within the distance range of approximately this maximum amplitude or less without swinging, and the elastic member is provided so that the inertial member can repel the repulsive force. Excellent elasticity Because they are repelled by the action of the site with, it can reduce the input power to focus energy or coils for the minute vibration.

As a result, the present invention has a high vibration generation efficiency,
It came to the advantage of high power saving effect, and the intended purpose was often achieved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing a configuration of a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of the embodiment.

FIG. 3 is a plan view showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a partially cutaway side view of the embodiment.

FIG. 5 is a partially cutaway plan view showing a configuration of a third embodiment of the present invention.

FIG. 6 is a partially cutaway side view of the embodiment.

FIG. 7 is a partial cutaway plan view showing a configuration of a fourth exemplary embodiment of the present invention.

FIG. 8 is a drive circuit diagram suitable for the present invention.

FIG. 9 is a chart showing the relationship between input power and amplitude according to the present invention.

FIG. 10 is a configuration diagram of a conventional example.

[Explanation of symbols]

 1 base 1a IC 10 spacer 2 coil 2a lead wire 2b terminal 3 permanent magnet 30a outer yoke 30b inner yoke 31 magnetic gap 32 vent hole 4 leaf spring 4a leaf spring 4b leaf spring 40a joint forming plate 40b joint forming plate 40c joint forming plate 5 screw 6 elastomer resin 60 notch hole 61 leaf spring 7 housing 70 elastic housing 71 elastic protrusion

Claims (7)

[Claims] 1. A vibrating force generating mechanism based on an electromechanical conversion system, wherein an inertia member constituting the vibrating force generating mechanism comprises:
A vibration generator for a silent alarm attached to a base via a vibrating member, wherein the inertial member is provided with a portion capable of coming into contact with the inertial member within a distance range of approximately the maximum amplitude or less, and A vibration generating device for a silent alarm for a portable device, characterized in that an elastic portion is provided on the contact member side or the inertia member side. 2. A vibrating force generating mechanism includes a coil provided on the base side, and an inertia member that is a permanent magnet and is opposed to the coil and is connected to the base via a vibrating member. The inertial member includes a permanent magnet and a magnetic path member, has a magnetic gap between the permanent magnet and the magnetic path member, and is in non-contact with the magnetic gap so as to intersect the magnetic flux of the magnetic gap. In this state, the coil is inserted, and the inertia member and the coil are connected via a vibrating member so that they can relatively oscillate and generate vibration by energizing the coil. 2. A region where an inertia member can contact is provided within a distance range of maximum amplitude or smaller, and a region having elasticity is provided on the contact member side or the inertia member side. Vibration generator for silent alarms for mobile devices in Japan. 3. The portable device according to claim 2, wherein the portion with which the inertial member can come into contact is a housing accommodating a vibration generating device for a silent alarm, which comprises an inertial member, a coil, and a vibrating member. Vibration generator for silent alarm. 4. The vibration generator for silent alarm for a portable device according to claim 2, wherein the elastic portion is an elastic body attached to the inertia member. 5. The vibration generating device for a silent alarm for a portable device according to claim 2, wherein the elastic portion is an elastic body attached to the vibrating member on the inertial member side. 6. The vibration generator for silence alarm for a portable device according to claim 2, wherein the elastic portion is an elastic body attached to the inside of the housing. 7. The vibration for silent alarm for a portable device according to claim 2, wherein the housing is configured to have elasticity, and the elastic portion is the housing wall surface itself. Generator.