JPH10165892A - Vibration actuator for pager - Google Patents

Abstract

PROBLEM TO BE SOLVED: To convert a driving current to vibration energy by adhering a collision part with a coil upper part of a vibrator at the time of generating the vibration outside by bringing the part moving integrally with a vibrator of a vibration actuator for a pager built into a portable telephone set, etc., into collision against a fixed collision part. SOLUTION: This actuator is provided with the vibrator 1 and a damper 7 to be displaced in a vertical direction in order to support the central position and upper and lower positions of a coil 3. The adhesion of the vibrator 1 and the damper 7 is made secure by a bobbin 9 and a toric flat part 8 is formed. The collision part 2 adhered by an adhesive, etc., to this toric flat part 8 is integrated with a collision cover 12. A magnetic circuit is formed by adhering a plate 6 consisting of a disk-shaped magnetic material to the magnetic pole on one side of a magnet 4 which is formed to a columnar shape opened with a hole 13 at its center and is polarised in a thickness direction and adhering a yoke 5 consisting of a magnetic material to another magnetic pole. The vibration generated by collision of the toric flat part 8 formed to the toric shape against the collision part 2 is propagated outside through the collision cover 12 when the actuator is driven by a low frequency of several ten Hertz.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a portable telephone or the like to notify a call at the time of a signal arrival not only by voice but also by vibration. Can be used.

[0002]

2. Description of the Related Art A conventional pager vibration actuator is also called a pager vibration motor or vibration generation actuator, and needs to be small, thin, capable of generating vibration with low power consumption, and inexpensive. However, since the purpose is to generate only vibration, it is naturally impossible to make a voice call or generate a conversation sound. Therefore, at least two or more device parts are required for incoming information and voice generation. In addition, a vibrating motor for a pager that is frequently used consumes a large amount of starting power because a relatively large mass is rotated. Further, the number of parts is increased due to the configuration of rotation, and there are problems in reliability and accuracy control. Since a brush for current switching is used because of the use of a direct current, a large electromagnetic noise may be generated, a malfunction may occur during rotation, and there is a limit to downsizing and flattening.

FIG. 24 shows the most commonly used vibration motor for a pager. The counterweight 123 rotates via a shaft 122 driven by a drive motor 121 constituted by a cylindrical coreless rotor, and generates whirling vibration. Of course, it is not possible to generate sounds other than vibration. The drive motor 121 is formed of a curved permanent magnet and a cylindrical coreless rotor, and it is necessary to form a plurality of magnetic poles to obtain a rotational drive force. FIG. 25 shows a state of vibration of the cylindrical vibration motor for a pager, which has limitations in accuracy control and manufacturing cost. The rotation by the drive motor 121 causes the counterweight 123 to swing around the center of rotation 124. Since the direction of vibration is generated in all directions, there is a direction in which the vibration is not effectively transmitted to the outside depending on the manner of fixing the vibration motor for the pager, and the whirling moment is proportional to the square of the rotation speed of the drive motor 121. Therefore, a driving force is required and there is a limit to power saving.

FIG. 26 is a perspective view showing the inside of a conventional vibrating motor 125 for a pager constituted by a flat coreless rotor. A disk-shaped winding coil 126 whose center of gravity is eccentric is provided on the rotation shaft 128, and a rotation driving force is generated between the rotation coil 128 and a thin plate-shaped permanent magnet 127. The driving current is the brush 129
Supplied from Unlike a cylindrical one, vibration is generated at the time of rotation using a winding coil 126 having an eccentric center of gravity instead of the counterweight. Of course, you can't speak. In addition, several meters with an outer diameter of 20 mm or less
It is difficult to make the shape less than m.

FIG. 27 shows a state of the most effective vibration of a flat-shaped vibration motor for a pager.
The rotation state in the axial direction with respect to 30 is indicated by 131, 132, 133 of the vibration motor main body for the pager. In addition to this, there are thickness vibration in the axial direction and vibration in the diameter perpendicular to the axis. However, depending on the manner of fixing the flat type vibration motor for the pager, it often does not contribute much to the generation of external vibration. . This means that the drive current applied to the winding coil is not effectively used as vibration energy to the outside.

[0006]

The conventional vibration actuator for a pager can generate vibration, but cannot generate sound. In addition, the starting power cannot always be reduced, and it is quite difficult to reduce the external dimensions. In addition, there is a case where a rotation operation failure easily occurs, and a large electromagnetic noise is generated.

An object of the present invention is to provide a vibration actuator for a pager which can generate vibration and sound and can effectively convert a drive current into vibration energy. It is an object of the present invention to provide a vibrating actuator for a pager with less defects and electromagnetic noise.

[0008]

In order to achieve the above object, in a vibration actuator for a pager according to the present invention, a vibrating body vibrating up and down of a moving coil type electroacoustic transducer conventionally used for sound generation. Is caused to collide with a portion fixed in proximity to generate vibration to the outside.

As the above-mentioned electro-acoustic transducer, it is optimal to use a moving coil type electro-acoustic transducer in which a driving coil moves up and down by interaction with a magnet and a vibrating body moves integrally with the coil. .

In addition, a collision portion formed of a resin material or the like is provided near the vibrating body of the electroacoustic transducer.

Further, the collision portion is formed in an annular shape, and has a size substantially equal to the diameter of the moving coil type coil, so that the collision of the vibrating body is dispersed in a portion having a high structural strength.

Further, the annular collision portion is formed in an annular flat portion, and the impact due to the collision is averagely dispersed so that the reliability at the time of the collision is provided and the generation of the collision sound is reduced.

The colliding portion and the annular flat portion are directly adhered to each other with an adhesive or an adhesive sheet, and the vertical displacement of the coil is changed into the vibration of the collision portion and a part of the collision cover integrally formed of a resin material or the like. .

A plurality of spiral dampers are formed inside the annular flat portion of the annular collision portion, and the other end is fixed to the center of the plate to reduce the overall diameter. It is good to integrally mold with resin.

A magnetic circuit composed of a magnet, a yoke and a plate is supported on a collision cover, which is a portion fixed by a vertically flexible component.

This component is formed in an annular shape with thin rubber,
The lower end supports a flat part around the yoke, the upper end is adhered to the fixed part of the collision cover, and the ends are supported by a plurality of thin rubbers to make the magnetic circuit easily move up and down flexibly. .

Alternatively, the magnetic circuit can be moved up and down by sandwiching this component between a flat back surface at the top of the yoke at the outermost periphery of the magnetic circuit and a support fixed to the collision cover with a tubular rubber.

Alternatively, this component is sandwiched between a flat portion on the back surface of the top of the yoke at the outermost periphery of the magnetic circuit and a supporting portion fixed to the side surface and the collision cover with a bellows-like rubber or a foamed elastic material so that the magnetic circuit is moved up and down. Make it flexible.

Alternatively, this component is formed of thin rubber,
One end supports the bottom of the yoke, which is a part of the magnetic circuit, and the other end is adhered to a collision cover, which is a fixed part, to flexibly support the magnetic circuit up and down.

Alternatively, when this component is formed of rubber, it is adhered to the collision cover with an annular resin molding material having a plurality of claw-shaped protrusions outside the outer diameter of the yoke of the magnetic circuit, and the yoke is attached to the claw-shaped protrusions. The magnetic circuit can be flexibly moved up and down by applying rubber that supports the bottom.

Alternatively, when this component is formed of rubber, the magnetic circuit has a plurality of claw-shaped projections outside the outer diameter of the yoke and is bonded to the collision cover with an annular resin molding material. A ring having a hook protruding from the slit is adhered to the bottom of the magnetic circuit, and rubber is applied to the claw-like projection and the hook to make the magnetic circuit move up and down flexibly.

Alternatively, the magnetic circuit is supported only by a damper in which this component is adhered and fixed at the center of the plate, and the magnetic circuit can be flexibly moved up and down.

Then, a plate having a circular hole is adhered to the plate above the magnetic circuit, the circular hole is arranged at the center, and a damper formed of a resin material is fitted. In this case, the damper is inclined. The central portion may be raised.

When a low-frequency driving current for generating vibration is applied to the coil, the alternating current is mainly composed of the polarity side which becomes the driving force in the direction in which the vibrating body collides with the magnet on the opposite side.

The waveform of the driving alternating current having one polarity is made to have a gentler rising and falling slope of the square wave.

In order to obtain the AC waveform, an integrating circuit is provided after the square wave transmitting circuit, and a voltage-current converting circuit for driving current is connected.

The yoke of the magnetic circuit is formed by stacking a plurality of thin plates of magnetic material and press-molding the yoke to have a relatively deep and vertical inner circumferential wall surface.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on examples with reference to the drawings.

FIG. 1 shows an embodiment of a vibration actuator for a pager according to the present invention, which uses the driving principle of a moving coil type electro-acoustic transducer for generating sound. In order to support the center position of the vibrating body 1 and the coil 3 and the upper and lower positions, it is bonded to a damper 7 that can be relatively softly displaced in the up and down direction. The bobbin 9 is bent inward at a right angle at the upper portion, so that the bonding between the vibrating body 1 and the damper 7 can be strengthened, and the annular flat portion 8 as an annular collision portion can be formed. The annular flat portion 8 and the collision portion 2 are directly bonded by an adhesive or an adhesive sheet. The collision part 2 is a collision cover 1
2 and constitutes a collision portion fixed as a whole.

In the magnetic circuit, a disk-shaped magnetic plate 6 is adhered to one magnetic pole of a magnet 4 which is a columnar permanent magnet magnetized with a hole 13 in the center, and to the other magnetic pole. Is formed by bonding a molded magnetic plate yoke 5. A coil 3 and a bobbin 9 are provided between the yoke 5 and the plate 6.
An annular gap that moves up and down is formed, resulting in a space with a high magnetic flux density.

In the case of voice, the frequency is as high as several hundred hertz to 3 kilohertz. Even if a relatively large driving current enters the coil 3, the displacement of the vibrating body 1 is relatively small, and depending on the softness of the adhesive layer. A dome-shaped vibrating body 1 is mainly used, and a collision cover 12 integrated with a collision portion 2 adhered to the dome-shaped vibration body 1
Are dependent on the driving force of the coil 3 and are displaced up and down, or both are displaced by the same vibration.
In the vicinity of. In the case of driving at a low frequency of several tens of hertz, the displacement of the vibrating body 1 and the like should be large. However, since the vibration is generated in the collision portion 2 by the instantaneous upward displacement by the coil 3, the collision portion 2 Even if the annular flat portion 8 is directly adhered to the annular flat portion 8, vibration is not suppressed.

The annular flat portion 8, which is an annular collision portion that collides with the collision portion 2 via the adhesive layer, is structurally strong and collides on average. The vibration generated by the collision propagates through the collision cover 12 and further propagates outside. Hole 14 in yoke 5
However, the collision cover 12 may be provided with a plurality of holes 15. A cross-sectional view of the embodiment of the present invention of FIG. 1 is shown in FIG.

When a voice for notifying the arrival of a signal or a conversation sound of the other party is generated, the vibration of the vibrating body 1 and the collision cover 12 is realized by a vibration of several hundred hertz to 3 kilohertz. Driving the vibrating body 1 at 10 Hz,
The collision vibration with the directly bonded collision part 2 is transmitted to the outside.
At this time, the vibration direction is only the vertical direction, and the vibration energy can be efficiently extracted to the outside. In order to suppress the sound generation level at the time of collision, to reduce the impact of the collision, and to make it less likely to be damaged, it is preferable to directly bond the collision portion 2 and the annular flat portion 8 with an adhesive or an adhesive sheet.

In order to further increase the vibration generated outside, a magnetic circuit including the yoke 18 other than the coil 20 collides with the collision cover 26 as shown in FIG. 3 in a sectional view which is an example of the embodiment of the present invention. Alternatively, it is effective to increase the collision force at the annular flat portion 23 of the coil 20 by effectively utilizing the repulsive force with the magnetic circuit. Naturally, the annular flat portion 23 is a collision portion 25 integrated with the collision cover 26.
And it is directly bonded with adhesive or adhesive sheet.

For this purpose, the magnetic circuit including the yoke 18 needs to be flexibly supported so that it can be displaced to some extent. In the embodiment shown in FIG. 3, the support rubber 29 supports a flat portion of the yoke top 28 around the yoke 18 of the magnetic circuit.
One end 30 of the upper thin rubber is adhered to the collision cover 26, and the other end 31 of the lower thin rubber covers under the yoke top 28. Both ends of the upper and lower thin rubbers are formed in an annular shape, and are connected by a plurality of independent supporting rubbers 29 having a small width. It is appropriate that the supporting rubber 29 and the annular thin rubber at the upper and lower ends are integrally formed.

FIG. 6 is a perspective view of a structure for flexibly supporting a magnetic circuit including the yoke 18 of the actuator used in the embodiment of the present invention shown in FIG.
One end 30 of the annular thin rubber sandwiching the yoke top portion 28 is adhered to the collision cover, and the other end 31 of the annular thin rubber becomes larger as the supporting rubber 29 receives the force of extension when the portion closer to the supporting rubber 29 becomes larger. Direction, and as a result, the support rubber 29
Is equivalent to a large increase in Adhering to the yoke top 28 at an intermediate position from the plurality of support rubbers 29 at the other end 31 of the annular thin rubber is effective for positioning. The electrode wire is taken out from the slit 32.

FIG. 5 shows an actuator which is a driving unit including the magnetic circuit and the coil 20 used in the embodiment shown in FIG. 3 of the present invention. The bobbin 19, the coil 20, and the annular flat portion 23 are supported by a damper 21 so that the bobbin 19, the coil 20, and the annular flat portion 23 can be displaced firmly in the center direction and soft in the vertical direction.
Fix the position with.

FIG. 4 shows an embodiment of the present invention in which a driving current is applied to the coil 20 of FIG.
5 shows a state in which the magnetic circuit has been displaced downward by the reaction. At this time, the support rubber 29 supporting the yoke top portion 28 extends, and the yoke 18, the magnet 16 and the plate 17
The yoke top 28 moves further down, leaving the yoke top 28 farther from the impact cover 26. This state indicates a state in which the collision vibration by the coil 20 is transmitted to the collision cover 26, or a state in which the drive current has a polarity as described below.

When the driving current is given a polarity, an alternating current of substantially one polarity is used so that a force mainly driving the coil 20 in the direction opposite to the magnet 16 in FIG. It is valid. The direction of the polarity is uniquely determined by the direction of the current depending on the magnetization direction of the magnet 16 and the winding method of the coil 20, and a polarity matching the direction of the current is selected. The dashed square wave current 34 in FIG.
Is that the value of B is greater than the value of C, and the polarity of B is mainly. The solid square wave current 33 has only one polarity between A and zero.

When the driving current has no polarity, the magnetic circuit including the yoke 18 is displaced in the opposite direction only when the current receiving the driving force in the direction of the collision cover 26 flows through the coil 20 in the embodiment of FIG. As a result, the yoke top 28 is separated from the collision cover 26 as shown in FIG. Naturally, the coil 20 and the annular flat portion 23 are directly bonded to the collision portion 25 with an adhesive or an adhesive sheet, so that they do not separate from each other. The yoke top 28 will collide with the collision cover 26. At this time, it is necessary to suppress unnecessary sound at the time of collision.

When the driving current has a polarity on one side only and has a somewhat large current value A as shown by a square wave current 33 indicated by a solid line in FIG. 7, the yoke top portion 28 is always moved from the collision cover 26 as shown in FIG. The remote state is maintained. For example, when the value of A in FIG. 7 is set to 200 milliamps, when the magnetic circuit including the yoke 18 is supported by the relatively soft support rubber 29 in FIG. Vibrates with an amplitude of about plus or minus 0.1 mm at several tens of hertz while maintaining.

In this case, the yoke top 28 is
In order not to collide with 6, the elastic material may be interposed all around or partly, but it is not always necessary to take measures against unnecessary sound.
Further, the vibration due to the collision is transmitted from the collision portion 25 to the collision cover 26 by the collision via the adhesive layer from the annular flat portion 23 integrated with the coil 20. When the square wave current 33 shown in FIG. 7 rises, the reaction of the coil 20 with the magnetic circuit including the yoke 18 is added, so that a large collision force is applied to the collision portion 25, and the vibration generation level increases.
Further, when the polarity of the driving current is all biased and the maximum peak current value is larger, the driving force of the coil 20 and the collision force due to the reaction with the magnetic circuit are larger, and the countermeasures against unnecessary sound due to the collision of the yoke top 28 are also troublesome. Is reduced.

When a drive current having a sharp rise is applied to the coil 20 of the embodiment of FIG. 3 like a square wave current 33 of only one polarity in FIG. 7, a sudden drive force or reaction from the magnetic circuit is generated. Since the change due to the force occurs, the instantaneous mechanical deformation stress of the vibrating body 24 and the like is large, and unnecessary sound different from the collision sound including many high frequency components is generated at a considerable level. In the case of a trapezoidal wave, the generation of the unnecessary sound becomes smaller as the slope portion is loosened, and becomes lower in the case of the SIN wave and the triangle wave. However, if the inclination is too gentle, the vibration level will be low. This phenomenon has the same effect as that of the vibrating body 24 except for most of the dome portion of the vibrating body 24, although there is a merit that the level of unnecessary sound is slightly lowered.

The trapezoidal wave is also similar to the waveform in which the rising and falling slopes of the square wave are alleviated. In the case of the square wave 35 shown by the broken line in FIG. 8, the rising curve 36 and the falling curve 36 are passed through the integration circuit. As in 37, the inclination of the waveform can be reduced. In the case of the rising curve 36, by simply setting the time required to reach the saturation level A to be equal to or less than 1/6 of one cycle, the unnecessary sound having a high frequency component can be suppressed to a level that causes almost no problem. Of course, the shape of the falling curve 37 is inverted and similar to the rising curve 36. Incidentally, when the frequency was 80 Hz, the unnecessary sound was negligible at a practical level with a time constant of about 1.5 milliseconds. As shown in the block diagram of the circuit configuration, as shown in FIG. 9, a square wave transmitting circuit 38 may be followed by an integrating circuit 39 and a voltage-current converting circuit 40.

Regardless of the waveform of the driving current, the annular flat portion 2 integrated with the coil 20 as shown in the embodiment of FIG.
3 is directly adhered to the collision portion 25 via the adhesive layer, compared to a case where the annular flat portion 23 may be separated from the collision portion 25 without being adhered, the unnecessary sound at the time of collision is reduced. Occurrence levels are low. As a matter of course, the vibration generation level is not reduced. Although the sound has a slight decrease in low-frequency sound around several hundred hertz, a low-frequency output can be obtained by making the collision cover 26 relatively thin. High frequency sounds are rather high. The reason is that not only the vibrating body 24 but also a part of the collision cover 26 made of a resin plate follows and vibrates.

According to another embodiment of the present invention in which the above case is more thorough, as shown in the sectional views of FIGS.
The dome-shaped portions of the vibrating body 1 and the vibrating body 24 shown in the embodiment of FIGS. 1 and 3 are removed, and the holes 15 and the holes 27 in the collision cover 12 and the collision cover 26 are eliminated. become.

In FIG. 10, the vibrating body 41 has no dome-shaped portion. However, it is configured integrally with the bobbin 45, the coil 46, and the annular flat portion 44, is supported by a flexible damper 42 for vertical displacement, and is fixed in position by the damper support portion 43. A driving current is applied to the coil 46, and the collision cover 47 vibrates through a collision with the collision portion 48 bonded to the annular flat portion 44. In the case of a sound having a frequency of several hundreds to several kilohertz, Even if it vibrates with a relatively small displacement, the impact cover 47 has a relatively large area, so that the sound level becomes considerably large. It goes without saying that vibrations due to low frequencies can be greatly increased by flexibly supporting the magnetic circuit including the yoke 18. Collision cover 4
By sealing without providing a plurality of holes in 7, as a result, it also plays a role of waterproofing and dustproofing.

FIG. 11 shows an embodiment of the present invention for the same purpose. An annular thin portion 51 is provided near a collision portion 50 of a collision cover 49 made of resin or the like, so that displacement can be easily taken. By doing so, it is possible to make the sound generation level higher. Even if the diameter of the thin portion 51 is further increased, a larger sound can be generated.

As shown in FIG. 12, when the vibration actuator for the pager of the present invention shown in FIG. 10 is mounted inside the housing position 52 on the mobile phone, it naturally vibrates at the housing position 52. Depending on the design and drive frequency of the housing, the vibration level of the housing position 54 or the housing position 55 may be higher than that of the nearby housing position 53. However,
Since the portion that emits the sound is not fixed to a part of the housing and is not limited to one surface from a relatively wide housing surface, the sound level is relatively large, and furthermore, the portion of the housing position 52 may be clothes or the like. It is easy to hear the incoming voice even if the contact is made. At the housing position 56 in which the audio microphone is built, it is preferable to set the microphone by floating it from the housing with an elastic material so that sound due to vibration is not greatly mixed.

Another embodiment of the present invention having the same purpose as that of FIG. 10 is shown in FIGS. 13, 14, 15, 16, 17, and 18.
FIG. The concept of the structure for generating vibration and sound is the same. It goes without saying that the concept of bonding to the colliding portion via the adhesive layer and the concept of flexibly supporting the magnetic circuit to further increase the vibration level are the same.

In the sectional view of the embodiment shown in FIG. 13, the magnetic circuit is supported by a support portion 60 via a tubular rubber 59 on a flat portion on the back surface of the yoke top 58 at the outermost periphery. Since the support portion 60 itself is fixed to the collision cover 47, the magnetic circuit including the yoke 57 can be displaced up and down relatively flexibly. The support portion 60 may be formed in an annular shape and bonded to the collision cover 47.

FIG. 14 is a cross-sectional view of another embodiment of the present invention, in which a bellows-like rubber 62 formed in a bellows shape is pressed on a flat back surface of a yoke top 58 at the outermost periphery of the magnetic circuit.
And the supporting portion 63. As a result, the magnetic circuit including the yoke 57 can be displaced up and down flexibly.

FIG. 15 is a cross-sectional view of another embodiment, in which a tubular foamed elastic material 64 is applied to a flat back surface of a yoke top 58 at the outermost periphery of a magnetic circuit, and a yoke 57 is supported by a support 63.
Flexible support for magnetic circuits including Both support parts are integrated with the collision part via the collision cover.

An embodiment of the present invention having the same purpose as that of FIG. 10 but configured to suppress the actual assembly and the irregularity of the characteristics is shown in the sectional views of FIGS. 16, 17 and 18. FIG.
The annular resin molding 7 having a plurality of claw-like projections 75
4 is adhered to the collision cover 78. The vicinity of the inner diameter of the annular resin molding 74 is also used as a collision portion, and the annular flat portion 73 having the coil 67 is directly bonded. Support rubber 76
Is hooked on a plurality of claw-shaped projections 75, and the yoke 6
8, the yoke 68, the plate 66 and the magnet 65
The magnetic circuit consisting of is supported to move up and down flexibly.
Since the support rubber 76 does not need to be fixed by bonding or the like, it is easy to assemble and unevenness in characteristics is small.

In FIG. 17, instead of supporting the bottom of the yoke 83 with the support rubber 79, the magnetic circuit is supported by a plurality of hooks 80 alternately and flexibly moving up and down. The hook 80 is integrated with the ring 82. The ring 82 is a magnet 6
The hook 80 is protruded from the slit 81 by being adhered and fixed to a bottom portion between the yoke 83 and 5.

In the embodiments of FIGS. 16 and 17, the center of the magnetic circuit and the coil 67 is also determined by using a vertically flexible damper 71 having a damper supporting portion 72 adhered and fixed at the center of the plate 66.
What is done in the same. By supporting with the support rubber 79 using the hook 80, no rubber is required at the bottom of the yoke 83, and the overall thickness can be reduced as much as possible.

FIG. 18 has almost the same configuration as FIG.
This is to make more effective use of the magnet and make the whole as thin as possible. Although the claw-shaped projection 75 and the bottom of the yoke 88 are supported flexibly by the support rubber 76 for the magnetic circuit, the plate 86 above the magnet 85 does not have a hole in the center, so that the magnet can be effectively used. Available. In addition, the damper 90 is inclined so that the center is high, and the damper support portion 92 is fitted into the center hole of the perforated plate 93 bonded to the plate 86 and fixed by adhesion. it can. And the yoke top 9
The elastic member 95 may be interposed in order to alleviate a collision that rarely occurs with the annular resin molded material 74 bonded and integrated with the collision cover 78.

When the vibrating actuator for a pager according to the present invention is used in a portable telephone or the like, when a sudden change in acceleration occurs due to a drop or the like, a sudden position change occurs in the collision cover 78 and a relatively large magnetic circuit. As a result, a large stress may be applied to the damper 71 and the like, resulting in breakage. In order to avoid this, the supporting rubbers 76 and 79 also play a role in protecting the collision cover 78 in the vertical direction, and more importantly, the claw-like projections 75 from a large acceleration change in the parallel direction.

FIG. 19 is a perspective view showing the embodiment of FIG. 16 upside down. The bottom of the yoke 68, which is a part of the magnetic circuit, is supported by a rubber bottom 77 continuous with the support rubber 76, and the support rubber 76 is hooked on a claw-shaped projection 75 provided on an annular resin molding 74 to cover the entire magnetic circuit. Support flexibly. In this case, it is convenient when the electrode wire 96 drawn out from the coil is connected to the terminal 98 by being pressed and fixed with an elastic material 97 and connected to the terminal 98.

In another embodiment of the present invention shown in FIG. 20, an annular resin molding material 99 having a claw-like projection 75 on which a support rubber 76 is hung is integrally formed with an annular flat portion 102 to which a coil 103 is adhered. , Directly adhered to the collision cover 78 with an adhesive or an adhesive sheet. The damper 100 may also be integrally formed. This configuration has a small number of parts.

In FIG. 21, the purpose of supporting the magnetic circuit flexibly to increase the vibration is the same, and the same applies to the case where the annular flat portion 108 is directly adhered to the collision portion 48. Are different in the configuration supported. At the center of the plate 17, the damper support 107 is adhered and fixed, and the damper 1
06 only supports the magnetic circuit flexibly. When a driving current of one polarity is applied, the yoke 57 moves to a position where the center of displacement is away from the collision cover 47. In order not to make the displacement amount extremely large and to make the vibration flexible,
It is effective to make the inside of 6 thin and the outside thick.

In all the embodiments of the present invention, for example, the damper 7 in FIG.
2, damper 71, damper 90, damper 100 and damper 1
06 was used. The purpose of the structure of these dampers is to position the coil and the vibrating body in the center direction and the vertical direction with respect to the magnetic circuit. And had

As shown in FIGS. 5 and 22 which are perspective views of a part of the actuator, the damper 21 is formed of a resin material and has a width as small as about 1 mm and a thickness as small as about 0.2 mm.
And a plurality of dampers 71 are provided in a spiral shape. At that time,
By providing it inside the coil 20 or the coil 67, the overall diameter can be reduced. Further, the annular flat portions 23 and 7 for fixing the coil 20 of FIG. 5 and the coil 67 of FIG.
3 and the dampers 21 and 71 are preferably formed by integral molding of resin. When the bobbin 19 is provided as shown in FIG. 5, the bobbin 19 may be formed together with the damper 21. Damper 2
Reference numeral 1 denotes a hole in the magnet 16 or the plate 17 which is positioned by the damper support 22. Also in FIG. 22, the position of the damper 71 is fixed by the damper support portion 72.

Incidentally, as shown in FIG.
A plurality of thin magnetic plates, and a plurality of slits 1
By providing and press-molding 12, it becomes easy to accurately and deeply extend the circumferential vertical inner wall surface facing the plate 66. Also, by increasing the number of the bottom portion and the annular side surface portion of the yoke 110 through which the magnetic flux flows, and reducing the number of the yoke top portion 111, the purpose of the magnetic circuit is not sacrificed, and the overall weight is reduced. Can be reduced. In addition, it is preferable to take out the electrode wire 115 from the recess 114 near one of the slits 112. The elastic member 113 provided separately on the yoke top 111 is for suppressing the generation of unnecessary sound at the time of collision.

Incidentally, in order to increase the vibration and suppress the generation of unnecessary sound at the time of collision, a vibrating portion such as a coil is directly bonded to the colliding portion via an adhesive layer as in the present invention.
An example of a transitional stage leading to the present invention, different from a method of flexibly supporting a yoke of a magnetic circuit, is shown. As shown in FIG.
If the annular flat portion 23 is not adhered to the elastic member 117, and the magnetic circuit including the magnet 16, the plate 17, and the yoke 18 is fixed to the collision cover 116 by the support portion 120, it is difficult to suppress unnecessary sound at the time of collision. I do. In particular, the elastic material 117
There is a problem in the selection of a new one and maintaining its long-term reliability.
Since the displacement of the magnetic circuit including the yoke 18 cannot be increased, a force due to the reaction to the coil 20 due to the accumulation of elastic energy by the flexible support structure cannot be expected. As a result, the annular flat portion 23 integrated with the coil 20 It should be added that the vibration caused by the collision with the collision cover 116 does not become so large.

[0066]

Since the present invention is configured as described above, it has the following effects.

The annular flat portion, which is an annular collision portion integrated with the coil, is large due to the collision by the coil despite being directly bonded to the collision portion integrated with the collision cover with an adhesive or an adhesive sheet. Vibration can be extracted. At the same time, because of the adhesion, unnecessary collision sound at the time of collision can be suppressed relatively easily. Not only can the level of the unnecessary sound of the present invention be lowered, but also the sound of high frequency components found in the conventional vibration motor for a pager is small.

Furthermore, the magnetic circuit such as the yoke is flexibly supported by rubber or the like so that the magnetic circuit can relatively easily move in the vertical direction. A large vibration can be generated at the time of a collision by adding it to its own driving force.

The polarity of the drive current, and the fact that the coil is pushed in the collision direction and is always in close contact with the collision portion is consistent with the fact that the coil is adhered to the collision portion. Hardly works during driving. By flowing a more polarized drive current through the coil,
A magnetic circuit composed of a yoke, a magnet, and the like, which is flexibly supported by the repulsive force, is maintained at a distance from a colliding portion, and moves with an amplitude determined by a frequency and a current value of the driving current. Since the reaction force is applied to the coil, a large vibration can be generated through the collision of the coil.

As a result, a large vibration can be generated as compared with a conventional vibration motor for a pager. In addition, since the vibration sound does not include high-frequency vibrations due to sliding and the frequency of the drive current that can be freely selected is low and single, a frequency that can be easily recognized by the user can be selected. However, it is more reliable to avoid the vicinity of the resonance frequency.

At the time of this drive current, the magnetic circuit hardly collides with the collision cover or the like. Therefore, there is no difficulty in selecting an elastic material for suppressing unnecessary sound generated at the time of collision and ensuring thickness and material reliability. It is only necessary to simply provide a material to simplify measures when the external acceleration changes greatly or when the vehicle is not driven.

By reducing the shape of the driving current to a square wave, particularly the rising, unnecessary noise at the time of coil collision can be suppressed. However, an annular flat portion integrated with the coil is applied to the collision portion via an adhesive layer. By direct bonding and by removing the domed part of the vibrating part,
Even if the rising slope is slightly steep, the vibration due to the collision can be increased without significantly increasing the generation level of the unnecessary sound.

As a result, according to the present invention, both the coil and the yoke move only in the vertical direction, and the vibration energy can be effectively propagated by colliding with a relatively thin and flexible resin plate via the adhesive layer. And vibration energy can be effectively extracted. In addition, since the starting power is relatively small, power consumption can be reduced.

The driving current is of course an alternating current.
Electromagnetic noise does not occur because switching of contacts is not required unlike a conventional direct current driven vibration motor for a pager. This eliminates the need for a noise filter in the mobile phone and does not cause malfunctions in external devices.

Further, in the case of the present invention in which the damper is disposed inside the coil diameter, the diameter of the driving coil is large and the driving force is large, but the overall outer diameter can be reduced. In addition, the thickness is likely to be acceptable in the case where both vibration generation and voice utterance are used.

In addition, since it is not always necessary to make a hole near the collision portion in order to generate sound, it is possible to design a waterproof or dustproof device.

Further, assembling work and accuracy control are simplified, and since there is no rotating part as in the prior art, there is no brush or bearing part, and the total number of parts can be reduced. Further, there is no disadvantage that the rotation is not started depending on the position of the electric contact.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vibration actuator for a pager of the present invention.

FIG. 2 is a sectional view of the embodiment of FIG.

FIG. 3 is a sectional view of another embodiment of the present invention.

4 is a sectional view of the embodiment of FIG. 3 at the time of current driving.

FIG. 5 is a partially cutaway perspective view of an actuator used in the present invention.

6 is a perspective view in which the embodiment of FIG. 3 is reversed.

FIG. 7 is a diagram showing an example of a drive current used in the present invention.

FIG. 8 is a diagram showing an example of another drive current used in the present invention.

9 is a circuit block diagram for generating the drive current shown in FIG.

FIG. 10 is a cross-sectional view of another embodiment of the present invention.

FIG. 11 is a sectional view of another embodiment of the present invention.

FIG. 12 is an external view of a mobile phone incorporating a product of the present invention.

FIG. 13 is a sectional view of another embodiment of the present invention.

FIG. 14 is a cross-sectional view of another embodiment of the present invention.

FIG. 15 is a sectional view of another embodiment of the present invention.

FIG. 16 is a sectional view of another embodiment of the present invention.

FIG. 17 is a sectional view of another embodiment of the present invention.

FIG. 18 is a sectional view of another embodiment of the present invention.

FIG. 19 is a perspective view of the embodiment of FIG. 16 or FIG.

FIG. 20 is a sectional view of another embodiment of the present invention.

FIG. 21 is a sectional view of another embodiment of the present invention.

FIG. 22 is a partially cutaway perspective view of an actuator used in the present invention.

FIG. 23 is a sectional view of an embodiment before the present invention.

FIG. 24 is a perspective view of a conventional cylindrical vibration motor for a pager.

FIG. 25 is an explanatory diagram of a vibration state of the conventional example of FIG. 24;

FIG. 26 is a perspective view of the inside of a conventional flat-type vibration motor for a pager.

FIG. 27 is an explanatory diagram of a vibration state of the conventional example of FIG. 26;

[Explanation of symbols]

1, 24, 41, 70, 89, 99, 105 Vibration body 2, 25, 48, 50 Collision part 3, 20, 46, 67, 87, 103, 109 Coil 4, 16, 65, 85 Magnet 5, 18 , 57, 57, 68, 83, 88, 110 Yoke 6, 17, 66, 86 Plate 7, 21, 42, 71, 90, 100, 106 Damper 8, 23, 44, 73, 91, 102, 108 Annular Flat part 9, 19, 45 Bobbin 10, 61, 64, 95, 97, 104, 113, 11
7, 119 elastic material 11 support frame 12, 26, 47, 49, 78, 116 collision cover 13, 14, 15, 27, 118 hole 22, 43, 72, 92, 101, 107 damper support 28, 58, 69 , 84, 94, 101, 111 Yoke tops 29, 76, 79 Support rubber 30 One end of rubber 31 The other end of rubber 32, 81, 112 Slits 33, 34, 35 Square wave current 36 Rising curve 37 Falling curve 38 Square wave Oscillator circuit 39 Integrator circuit 40 Voltage-current converter circuit 51 Thin portion 52, 53, 54, 55, 56 Housing position 59 Tubular rubber 60, 63, 120 Supporting part 62 Bellows-like rubber 74 Annular resin molding material 75 Nail-shaped protrusion 77 Rubber bottom 80 Hook 82 Ring 93 Perforated plate 96, 115 Electrode wire 98 Terminal 114 Recess

Claims (18)

[Claims] A magnetic circuit comprising a permanent magnet and a coil;
In an electroacoustic transducer composed of a vibrating body that can move up and down,
A configuration in which the fixed collision part and the upper part of the coil of the vibrator are directly bonded to each other when a vibration is generated outside by causing a part that moves integrally with the vibrator to collide with a fixed collision part with a low-frequency electric signal input. A vibration actuator for a pager, characterized in that: 2. The vibration for a pager according to claim 1, wherein a dome portion inside the coil of the vibrating body is removed, and a hole is not formed in a collision cover integrated with the fixed collision portion. Actuator. 3. A vibration actuator for a pager according to claim 1, wherein a magnetic circuit other than said coil, comprising a permanent magnet, a yoke and a plate, is supported by a vertically flexible structure. 4. The flexible structure is characterized in that a flat portion around the yoke is vertically sandwiched between thin rubbers, and the upper and lower thin rubbers are continuously supported by a plurality of rubbers at a plurality of locations. The vibration actuator for a pager according to claim 1, 2 or 3, wherein 5. The vibration actuator for a pager according to claim 4, wherein the upper and lower thin rubbers are formed in an annular shape. 6. A vibration actuator for a pager according to claim 1, wherein a peripheral portion of said magnetic circuit is supported by a support portion integrated with said fixed collision portion via a tubular rubber. . 7. The vibration for a pager according to claim 1, wherein a peripheral portion of said magnetic circuit is supported by a support portion integrated with said fixed collision portion via a bellows-like rubber. Actuator. 8. A vibration actuator for a pager according to claim 1, wherein a peripheral portion of said magnetic circuit is supported by a support portion integrated with said fixed collision portion via a foamed elastic material. . 9. The vibration actuator for a pager according to claim 1, wherein the magnetic circuit is supported only by a damper bonded at a center portion. 10. An annular resin molding having a plurality of claw-shaped protrusions outside the outer diameter of the yoke of the magnetic circuit is bonded to the collision cover, and rubber supporting the bottom of the yoke is provided on the claw-shaped protrusions. 4. The vibration actuator for a pager according to claim 1, wherein the vibration actuator is applied. 11. An annular resin molding having a plurality of claw-shaped protrusions outside the outer diameter of the yoke of the magnetic circuit is bonded to the collision cover, and the annular having a hook projecting from a slit of the yoke is formed. 4. The vibration actuator for a pager according to claim 1, wherein the magnetic circuit is supported by being bonded to a bottom of the magnetic circuit, and rubber is applied to the claw-shaped projection and the hook. 12. The vibration actuator for a pager according to claim 1, wherein an annular collision portion having a diameter similar to a diameter of the coil is provided. 13. A spiral damper is provided inside said annular collision portion.
The vibration actuator for a pager according to the above. 14. The vibration actuator for a pager according to claim 13, wherein the annular collision portion and the spiral damper are formed by integral molding of resin. 15. A damper inside the annular collision portion is inclined so that a central portion is higher than an upper surface of the magnetic circuit,
12. The vibration actuator for a pager according to claim 1, wherein the vibration actuator is fitted in a circular hole of a plate adhered to an upper surface of the magnetic circuit and is adhered and fixed. 16. The apparatus according to claim 1, wherein a driving force in a collision direction to the fixed collision portion opposite to the permanent magnet applies an alternating current mainly having a polarity acting on the coil. The vibration actuator for a pager according to the above. 17. The vibration actuator for a pager according to claim 16, wherein an alternating current is applied in which the rising and falling slopes of the square wave are alleviated. 18. The magnetic circuit according to claim 1, wherein the yoke of the magnetic circuit is formed of a plurality of thin magnetic plates.
The vibration actuator for a pager according to the above.