JP2000325881A - Vibration actuator for generating voice and low- frequency vibration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to support a magnetic circuit to a cover with a flexible component by elastically supporting a coil by a damper to the magnetic circuit of a vibration actuator which is inserted into a portable telephone set, and the like, and announce a call by vibrations, by which the drive current is effectively converted to the vibration energy. SOLUTION: A vibrator 1 and the coil 3 are adhered to the damper 7 which may be relatively softly displaced in a vertical direction in order to support the central positions and vertical positions thereof. A bobbin 9 is formed to a shape bent and molded perpendicular to an inner side in an upper part to allow the secure adhesion of the vibrator 1 and the damper 7 and to develop a toric flat part 8. This toric flat part 8 and the projecting part 2 of the cover 12 are adhered. A plate 6 consisting of a disk-shaped magnetic material is adhered to the magnetic pole on one side of a magnet (permanent magnet) 4 formed with a hole at its center and a yoke 5 of a magnetic plate is adhered to the other magnetic pole, by which the magnetic circuit is constituted. The toric flat part 8 is vibrated by the actuation of the magnetic circuit and the vibrations thereof are transferred to the cover 12 and are further propagated outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-acoustic transducer, which is installed in a portable telephone or the like and emits a sound for receiving a call or receiving an incoming call, capable of outputting a low-frequency vibration, and calling the same by vibration. This is an electric vibration transducer used to inform the user of the vibration, that is, a vibration actuator for generating sound and low-frequency vibration, and can be used as a vibration actuator for a pager, particularly for the purpose of reducing the size and weight.

[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. There are limits to quality control and manufacturing costs.

FIG. 25 shows the state of vibration of a cylindrical vibration motor for a pager. 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 vibration 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 the 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.

[0007]

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 generating a sound and a low-frequency vibration, particularly a vibration actuator for a pager, which can generate vibration and sound and can effectively convert a driving current into vibration energy. It is an object of the present invention to provide a vibrating actuator for a pager which is easy to manufacture, is small, easily flattened, and has few malfunctions.

[0009]

In order to achieve the above-mentioned object, the present invention provides a magnetic circuit having an annular magnetic gap including a permanent magnet and a yoke, and a coil disposed in the magnetic gap. In a vibration actuator having an electric vibration converter attached to a cover that causes an AC electric signal to flow to cause relative vibration between the coil and the magnetic circuit, the coil is attached to the cover and a damper is attached to the magnetic circuit. Elastically supported, the magnetic circuit is flexibly supported on the cover by a flexible component, and when the alternating current is a signal having a frequency lower than a voice frequency, the relative vibration is transmitted to the cover. Wherein, when the AC current has a high frequency sound frequency, the relative vibration causes the cover to vibrate and emit sound, It is generating vibration actuator.

[0010] The flexible component is an annular soft elastic material engaging portion attached to the cover, and the yoke top of the magnetic circuit is engaged with the engaging portion.

The locking portion may be a structure in which a flat portion around the yoke is vertically sandwiched between thin rubbers, and a plurality of rubbers are continuously supported between the upper and lower thin rubbers.

The upper and lower thin rubbers can be formed into an annular shape.

Another example of the flexible component is a tubular rubber extending around the outer periphery of the magnetic circuit, and the top of the yoke of the magnetic circuit is locked to the supporting portion of the cover via the tubular rubber. .

As still another example of the flexible structure,
An annular foamed elastic material extending around the outer periphery of the magnetic circuit, and the top of the yoke of the magnetic circuit is locked to the support portion of the cover via the annular foamed elastic material.

Another example of the flexible component is an annular bellows-like rubber extending around the outer periphery of a magnetic circuit, and the top of the yoke of the magnetic circuit is connected via the annular bellows-like rubber. Engage the support on the cover.

As an example of the flexible component, a thin rubber fixed to the cover while covering the outer surface of the magnetic circuit can be used.

In this case, an annular resin molding having a plurality of claw-shaped projections outside the outer diameter of the yoke of the magnetic circuit is bonded to the cover, and the thin rubber supporting the bottom of the yoke is attached to the claw. Hang it on the projection.

Alternatively, an annular resin molding having a plurality of claw-shaped projections outside the outer diameter of the yoke of the magnetic circuit is adhered to the cover, and a slit is provided in the yoke.
A ring having a hook projecting from the slit to the outside of the yoke is adhered to the bottom of the magnetic circuit, and the claw-shaped projection and the hook are covered with rubber to support the magnetic circuit.

The coil may be provided with an annular flat portion having a diameter similar to the diameter thereof, and the annular flat portion may be fixed to the cover.

The portion of the cover to which the annular flat portion is fixed may be a plate portion having no sound emission hole.

[0021] The damper may be a spiral damper provided inside the annular flat portion.

At this time, the annular flat portion and the spiral damper can be formed by resin integral molding.

The damper on the inner side of the annular flat portion is inclined so that the central portion is higher than the upper surface of the magnetic circuit, and can be fitted and fixed in a circular hole of a plate adhered to the upper surface of the magnetic circuit.

The alternating current applied to the coil to cause relative vibration between the magnetic circuit and the coil is such that a force for driving the coil toward the cover acts on the coil. It is preferable to use an alternating current mainly based on the polarity at that time.

Further, the alternating current can be an alternating current in which the slope of the rise and fall of the square wave is moderated.

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.

The above-described vibration actuator for generating sound and low-frequency vibration according to the present invention can be conveniently used as a vibration actuator for a pager by providing a cover for a housing of a portable telephone.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention as a vibration actuator for a pager having a cover of a telephone case will be described below with reference to the drawings.

FIG. 1 shows an example of 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 formed to be bent inward at a right angle at the upper portion, so that the bonding between the vibrator 1 and the damper 7 can be strengthened, and the annular flat portion 8 can be formed. The annular flat portion 8 and the protrusion 2 of the cover 12 are directly bonded by an adhesive or an adhesive sheet. The protrusion 2 is integrated with the cover 12 to form an annular protrusion fixed as a whole.

In the magnetic circuit, a disk-shaped magnetic plate 6 is adhered to one magnetic pole of a permanent magnet 4 which is a columnar magnet having a hole 13 formed in the center and magnetized in the thickness direction, 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, and 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. The dome-shaped vibrator 1 is mainly used, and the cover 12 integrated with the projection 2 adhered to the dome-shaped vibrator 1 is displaced up and down depending on the driving force of the coil 3 or both are displaced by the same vibration. This is performed in the vicinity of the driving coil 3. 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, but the vibration generated in the projection 2 is caused by the instantaneous upward displacement by the coil 3. 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 formed on the projection 2 via the adhesive layer is structurally strong and vibrates on average. This vibration propagates through the cover 12 and further propagates outside. The yoke 5 has holes 14 and the cover 12 has a plurality of holes 1.
5 may be provided. A cross-sectional view of the embodiment of the present invention of FIG. 1 is shown in FIG.

To generate a voice for notifying the arrival of a signal or a conversation sound of the other party, the vibration of the vibrating body 1 and the cover 12 is realized by vibration of several hundred hertz to 3 kilohertz. The vibrating body 1 is driven with hertz and the vibration with the directly bonded projection 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. Since the protruding portion 2 and the annular flat portion 8 are directly fixed with an adhesive or an adhesive sheet, no collision noise is generated due to the collision between the two.

In order to further increase the vibration generated outside, a magnetic circuit including the yoke 18 other than the coil 20 collides with the 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 effectively use the repulsion force with the magnetic circuit to increase the pressing force between the annular flat portion 23 and the protrusion of the coil 20. As a matter of course, the annular flat portion 23 is directly bonded to the protrusion 25 integrated with the cover 26 with an adhesive or an 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 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. Support rubber 2
Suitably, the thin rubber 9 at the upper and lower ends is formed by integral molding.

FIG. 6 is a perspective view showing a configuration 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 cover, and the other end 31 of the annular thin rubber becomes larger in the outer circumferential direction as the support rubber 29 receives the force of extension when the support rubber 29 is subjected to an extension force. As a result, it becomes equivalent to the support rubber 29 having greatly expanded. 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 drive current is applied to the coil 20 of FIG.
, The state where the magnetic circuit is displaced downward by the reaction. At this time, the support rubber 2 supporting the yoke top 28
9 extends, the magnetic circuit consisting of the yoke 18, the magnet 16 and the plate 17 moves down, the yoke top 28 being further away from the cover 26. In this state, coil 20
Shows the state in which the vibration of (1) is transmitted to the cover 26, or the state in which the drive current has a polarity as described below.

When the driving current is given a polarity, it is effective to use an alternating current having substantially one polarity so that a driving force mainly generated in the coil 20 in the direction opposite to the magnet 16 in FIG. It is. 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 larger than the value of C and mainly has the polarity of B. 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 cover 26 flows through the coil 20 in the embodiment of FIG. As a result, the yoke top 28 is separated from the cover 26 as shown in FIG. Naturally coil 20
And the annular flat portion 23 are directly adhered to the protruding portion 25 with an adhesive or an adhesive sheet, so that they do not separate from each other, and when the driving alternating current has the opposite polarity, the yoke top portion 28 It will collide with the 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 separated from the cover 26 as shown in FIG. State is maintained. For example, when the value of A in FIG. 7 is set to 200 mA, when the magnetic circuit including the yoke 18 is supported by the relatively soft support rubber 29 in FIG. It vibrates with an amplitude of plus or minus 0.1 mm at several tens of hertz while maintaining it.

In this case, since the yoke top portion 28 does not collide with the cover 26, an elastic material may be interposed all around or partly, but it is not always necessary to take measures against unnecessary sound. Further, relative vibration between the coil and the magnetic circuit is transmitted from the annular flat portion 23 integrated with the coil 20 to the cover 26 from the protrusion 25 via the adhesive layer. When the square wave current 33 shown in FIG.
The reaction with the magnetic circuit including 8 is added to apply a large displacement to the projection 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 relative vibration due to the driving force of the coil 20 and the reaction with the magnetic circuit is larger, and the countermeasures against unnecessary sound due to the collision of the yoke top 28 are troubled. Less.

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 a reaction from the magnetic circuit occurs. 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 triangular 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 a waveform in which the rising and falling slopes of the square wave are alleviated. However, in the case of the square wave 35 indicated by the broken line in FIG. 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 protruding portion 25 via the adhesive layer, unnecessary collision at the time of vibration is compared with the case where the annular flat portion 23 may be separated from the protruding portion 25 without being adhered. The sound generation level is extremely low. As a matter of course, the vibration generation level is not reduced. Although the sound has a slight decrease in low-frequency sound near several hundred hertz, a low-frequency output can be obtained by making the 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 cover 26 of the 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 cover 12 and the cover 2 are removed.
The holes 15 and holes 27 for sound emission, which were provided in 6, are eliminated.

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 cover 47 vibrates through the protrusion 48 bonded to the annular flat portion 44. In the case of a sound having a frequency of several hundreds to several kilohertz, a relatively small displacement occurs. Even if the vibration occurs, the 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. By sealing the cover 47 without providing a plurality of holes, the cover 47 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 protrusion 50 of a cover 49 formed of resin or the like to facilitate displacement. Thus, 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 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 idea of bonding the vibrating coil to the cover via the adhesive layer and the method 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 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 adhered to the 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 an annular foamed elastic material 64 is applied to the flat back surface of the yoke top 58 at the outermost periphery of the magnetic circuit.
Flexible support for magnetic circuits including Each of the support portions is integrated with the protrusion via the cover.

An embodiment of the present invention having the same purpose as that of FIG. 10 but having a structure for suppressing actual assembly and irregularities in 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 cover 78. This annular resin molding material 7
The vicinity of the inner diameter of 4 is also used as a projection, and the annular flat portion 73 having the coil 67 is directly bonded. A support rubber 76 is hung on a plurality of claw-like projections 75, a bottom of the yoke 68 is supported by a rubber bottom 77, and a magnetic circuit including the yoke 68, the plate 66, and the magnet 65 is supported so as to flexibly move up and down. 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 so as to move up and down flexibly by alternately hooking the hooks 80. 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.

Also in the embodiments of FIGS. 16 and 17, the center of the magnetic circuit and the coil 67 is determined by using a vertically flexible damper 71 having a damper support 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 is used to alleviate a collision that rarely occurs with the annular resin molded material 74 bonded and integrated with the cover 78.
May be passed through.

When the vibrating actuator for a pager according to the present invention is used in a cellular phone or the like, when a sudden change in acceleration occurs due to a drop or the like, a sudden change in position occurs between the cover 78 and a relatively large magnetic circuit. As a result, a large stress may be applied to the damper 71 or the like, which may lead to destruction. To avoid this, the supporting rubbers 76 and 79 are
8, and more importantly, the claw-like projections 75 also serve to protect against large acceleration changes 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-shaped projection 75 for hanging a support rubber 76 is integrally formed with an annular flat portion 102 to which a coil 103 is adhered. , Cover directly with adhesive or adhesive sheet 7
8 was adhered. 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 projection 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 10 is fixed.
6 alone supports the magnetic circuit flexibly. When a drive current of one polarity is applied, the yoke 57 moves to a position where the center of displacement is away from the cover 47. It is effective to make the inside of the damper 106 thin and the outside thick to make the vibration flexible without increasing the amount of displacement extremely.

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 noise at the time of collision, the vibrating part such as a coil is directly bonded to the protrusion of the cover 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.
When 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 cover 116 by the support portion 120, a collision between the annular flat portion and the cover may occur. We have a hard time suppressing unwanted sounds.
Also, there is a problem particularly in selecting the elastic member 117 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 transmission of vibration to the cover 116 does not become so large.

[0067]

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

Since the annular flat portion such as the bobbin to which the coil is fixed is directly adhered to the cover with an adhesive or an adhesive sheet, the relative vibration between the coil and the magnetic circuit can be drawn directly to the cover. Therefore, there is no need to provide a diaphragm corresponding to the cone of the speaker, and sound can be emitted. In addition, since the coil is attached to the cover, unnecessary collision noise due to the collision can be suppressed relatively easily.

Furthermore, by elastically supporting the magnetic circuit with rubber or the like so that the magnetic circuit such as the yoke can move up and down relatively easily, elastic energy in which low-frequency vibrations are accumulated in rubber or the like can be obtained. A large vibration can be generated in the cover by being added to the coil as a reaction.

Further, by supplying a driving current having a polarity to the coil, a magnetic circuit including a yoke, a magnet, and the like, which is flexibly supported by the repulsive force, is maintained in a state separated from the cover. The cover performs a motion having an amplitude determined by the current value, and applies a reaction force to the coil when the drive current rises, so that a large vibration can be generated in the cover via a large displacement force 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 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 countermeasure when the external acceleration greatly changes or when the device is not driven.

Further, the annular flat portion integrated with the coil is directly adhered to the protruding portion via the adhesive layer, and the vibrating body is removed. The relative vibration can be increased without significantly increasing.

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 to the cover, such as a resin plate, which is relatively thin and flexible, via the adhesive layer. , And can effectively extract vibration energy. 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 drive coil is large and the overall outer diameter can be reduced in spite of the large driving force. In addition, the thickness is likely to be acceptable in the case where both vibration generation and voice utterance are used.

Further, since it is not always necessary to make a hole in the vicinity of the projection in order to generate a sound, it is possible to design a waterproof or dustproof device.

Further, the 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, so that 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 cross-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 Vibrator 2, 25, 48, 50 Projection 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 cover 13, 14, 15, 27, 118 hole 22, 43, 72, 92, 101, 107 damper support portion 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 transmission Circuit 39 Integrating circuit 40 Voltage-current conversion 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-like projection 77 Rubber bottom 80 Hook 82 Ring 93 Perforated plate 96, 115 Electrode wire 98 Terminal 114 Recess

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04R 9/10 H04R 9/10

Claims (18)

[Claims] A permanent magnet and a yoke constitute a magnetic circuit having an annular magnetic gap, a coil is arranged in the magnetic gap, and an AC electric signal is passed through the coil to make the coil and the magnetic circuit relatively movable. In a vibration actuator having an electric vibration transducer attached to a cover, the coil is attached to the cover and the magnetic circuit is elastically supported by a damper, so that the magnetic circuit is flexible on the cover. The relative vibration is transmitted to the cover when the AC current is a signal having a lower frequency than the audio frequency, and the relative vibration is transmitted when the AC current is at a high frequency. A vibration actuator for generating voice and low-frequency vibration, wherein the cover vibrates due to vibration to generate voice. 2. The flexible component is a locking portion made of an annular soft elastic material attached to the cover, and the top of the yoke of the magnetic circuit is locked to the locking portion. The vibration actuator for generating voice and low-frequency vibration according to claim 1. 3. A structure in which the locking portion has a structure in which a flat portion around the yoke is vertically sandwiched between thin rubbers, and a plurality of rubbers are continuously supported between the upper and lower thin rubbers. The vibration actuator for generating voice and low-frequency vibration according to claim 2. 4. The vibration actuator for generating sound and low-frequency vibration according to claim 3, wherein the upper and lower thin rubbers are formed in an annular shape. 5. The flexible component is a tubular rubber extending around an outer periphery of a magnetic circuit, and a top of a yoke of the magnetic circuit is locked to a support of the cover via the tubular rubber. The vibration actuator according to claim 1, wherein the vibration actuator generates low-frequency vibration. 6. The flexible component is an annular foamed elastic material extending around an outer periphery of a magnetic circuit, and a top of a yoke of the magnetic circuit is connected to the cover via the annular foamed elastic material. The vibration actuator for generating sound and low-frequency vibration according to claim 1, wherein the vibration actuator is locked to the support portion. 7. The flexible component is an annular bellows-like rubber extending around the outer periphery of a magnetic circuit, and the top of the yoke of the magnetic circuit supports the cover via the annular bellows-like rubber. The vibration actuator for generating sound and low-frequency vibration according to claim 1, wherein the vibration actuator is locked to a portion. 8. The vibration actuator according to claim 1, wherein the flexible component is made of a thin rubber fixed to the cover while covering an outer surface of the magnetic circuit. 9. An annular resin molding having a plurality of claw-shaped protrusions outside the outer diameter of the yoke of the magnetic circuit is adhered to the cover, and the thin rubber supporting the bottom of the yoke is formed in the claw shape. 9. The vibration actuator according to claim 8, wherein the vibration actuator is mounted on a projection. 10. An annular resin molding having a plurality of claw-shaped protrusions outside the outer diameter of the yoke of the magnetic circuit is adhered to a cover, a slit is provided in the yoke, and the slit protrudes outside the yoke. 10. The sound and low-frequency vibration according to claim 9, wherein a ring having a hook formed is adhered to the bottom of the magnetic circuit, and the magnetic circuit is supported by applying rubber to the claw-shaped projection and the hook. Vibration actuator for generation. 11. The voice and low-frequency vibration according to claim 1, wherein an annular flat portion having a diameter similar to the diameter of the coil is provided on the coil, and the annular flat portion is fixed to the cover. Vibration actuator for generation. 12. The sound and low sound device according to claim 11, wherein the portion of the cover to which the annular flat portion is fixed is a plate-like portion having no sound emission hole. Vibration actuator for generating frequency vibration. 13. The sound and low-frequency vibration generating device according to claim 11, wherein the damper is a spiral damper provided inside the annular flat portion. Vibration actuator. 14. The vibration actuator for generating sound and low-frequency vibration according to claim 13, wherein the annular flat portion and the spiral damper are formed by integral molding of a resin. 15. A damper inside the annular flat portion is inclined so that a central portion is higher than an upper surface of the magnetic circuit,
15. The vibration actuator for generating sound and low-frequency vibration according to claim 13 or 14, wherein the vibration actuator is fitted in a circular hole of a plate adhered to the upper surface of the magnetic circuit and is adhered and fixed. 16. The alternating current applied to the coil for causing relative vibration between the magnetic circuit and the coil includes a force that drives the coil in the direction of the cover, the force being applied to the coil. The vibration actuator for generating sound and low-frequency vibration according to claim 1, wherein the vibration actuator is an alternating current mainly having a polarity when acting. 17. The vibration actuator for generating sound and low-frequency vibration 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 generating sound and low-frequency vibration according to any one of the above.