JPH1094233A - Vibration actuator for pager - Google Patents

Abstract

PROBLEM TO BE SOLVED: To convert a drive current to effective vibration energy by generating vibration outside by placing a vibrating body closer and colliding with a fixed portion and generating vibration and sound. SOLUTION: A vibrating body 14 is adhered to a ring-shaped flat portion 13 of a ring-shaped collision body, and a damper 11 is formed in one united body with a ring-shaped flat portion 13 and a resin. The damper 11 supports the center position of the vibrating body 14 and coil 10, a configuration capable of softly displacing in up-down direction is used and is supported by a damper support 12. When driving with a relatively low frequency, the ring-shaped flat portion 13 collides with a collision cover 17 through an elastic material 15 since the displacement by a coil 10 increases. Vibration created by the collision is propagated to the outside. When informing call incomming signal by a vibration, it is driven at a frequency lower than several hundreds Hz, and the collision vibration between the ring-shaped flat portion 13 and a collision cover 17 is transmitted to the outside. Vibrating direction at this time is up-down direction only, and vibration energy can be efficiently taken out to the outside.

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 a 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.

[0003] In addition, a vibrating actuator for a pager, which is often used, consumes a large amount of starting power because it rotates a relatively large mass. Further, the number of parts is increased due to the configuration of rotation, and there are problems in reliability and accuracy control. Because it has a brush for current switching because it uses DC current, it may cause malfunctions during rotation,
Also, large electromagnetic noise is generated.

FIG. 8 shows the most commonly used vibration motor for a pager. The counterweight 25 rotates via a shaft 24 driven by a drive motor 23 constituted by a cylindrical coreless rotor, and generates whirling vibration. The drive motor 23 is formed of a curved permanent magnet and a cylindrical coreless rotor,
Further, it is necessary to form a plurality of magnetic poles in order to obtain a rotational driving force, and there is a limit in precision management and manufacturing cost to realize a driving motor 23 having a small diameter. Furthermore, since the direction of the vibration mode is omnidirectional, there is a limit to the effective use of the drive current applied to the coreless rotor as the propagation of vibration energy to the outside.

[0005]

The conventional vibration actuator for a pager can generate vibration, but cannot generate sound, and the efficiency of converting it into vibration energy to the outside is not always good. In addition, the starting power cannot always be reduced, and it is quite impossible to reduce the external dimensions. There is a limit in reducing the cost, and there is also a case where a rotation operation failure is likely to occur, and a case having a core generates particularly large electromagnetic noise.

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 driving 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.

[0007]

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.

Further, a collision portion which vibrates and collides is formed in an annular flat portion so as to have a size substantially equal to the diameter of a coil of a moving coil type electroacoustic transducer, so that a collision of the vibrating body has a strong structural strength. Disperse in parts.

A plurality of spiral dampers are formed of a thin and narrow plate-like resin from the annular flat portion of the annular collision portion, and the other end is fixed to a hole of the plate to reduce the overall outer diameter. You may.

A vibrating body formed in a dome shape is adhered to an annular flat portion of the annular collision portion so that sound can be generated by vibration with a driving current having a frequency of several hundred Hz or more.

An elastic material is bonded to upper and lower fixed portions of the vibrating body where the annular flat portion collides, thereby reducing the level of sound when the collision occurs. Alternatively, the upper elastic material may be bonded to the annular flat portion.

When a low-frequency driving current for generating vibration is applied to the coil, the vibrating body is an alternating current mainly having a polarity side which becomes a force for colliding in the direction of the fixed portion opposite to the magnet. .

The waveform of the alternating current to be applied is made such that the slope of the rise and fall of the square wave is reduced.

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.

In order to further increase the vibration level, a magnet circuit other than the coil, a magnetic circuit composed of a yoke and a plate is supported by a collision cover which is a portion fixed by a flexible component.

For example, this structure 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 part to which the other end is fixed, so that the entire magnetic circuit is formed by the collision cover. Away from or collide.

The force that causes the magnetic circuit to vibrate and collide is generated as a result of the reaction caused by passing the alternating current through the coil.

The driving coil has no bobbin and is fixedly bonded to the flat annular portion. At this time, in order to reduce the diameter, it is preferable that the annular flat portion is formed by integral molding of a spiral damper provided inside and a resin.

With no current flowing through the coil, the coil is wound more around the plate on the permanent magnet side than on the non-permanent magnet side with the collision cover, and the magnet side is actively turned on the plate. It is good to put outside.

The elastic material which suppresses the generation of unnecessary sound at the time of collision makes the collision cover side thicker, and the plate side makes it thinner so as to make the overall thickness as small as possible.

[0021]

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 an alternating current for driving a vibration actuator for a pager according to the present invention. The alternating current has only one polarity between a zero level and an A level. The waveform relaxes the slope 1 of the rise and fall of the square wave, rises to the saturation level A in the curve 2, and falls from the level of A to the zero level in the curve 3.

FIG. 2 is a circuit block diagram for forming the alternating current. An integrating circuit 5 is connected after the square wave transmitting circuit 4 to reduce the rising and falling slopes of the square wave. Further, a voltage-current conversion circuit 6 is provided to obtain a drive current to flow through the coil of the vibration actuator for the pager.

FIG. 3 shows the vibration actuator for a pager driven by the driving current according to the present invention. As shown in FIG. 3, the driving principle of a moving coil type electro-acoustic transducer that generates sound is used. The vibrating body 14 is bonded to the annular flat portion 13 of the annular collision portion, and the damper 11 is formed integrally with the annular flat portion 13 by resin.

The damper 11 includes a vibrating body 14 and a coil 10
Is supported and supported by the damper support 12. The damper support 12 has, for example, a cylindrical configuration with a step, and is fixed to the center hole of the plate 8.

In the magnetic circuit, a disk-shaped magnetic plate 8 having a hole at the center is adhered to one magnetic pole of a magnet 7, which is a columnar permanent magnet magnetized in the thickness direction, and is attached to the other magnetic pole. Is formed by bonding a molded yoke 9 of a magnetic material. An annular gap in which the coil 10 can move up and down is formed between the yoke 9 and the plate 8, providing a space with a high magnetic flux density.

When driven at a relatively low frequency,
The annular flat portion 13 collides with the collision cover 17 via the elastic member 15 because the displacement by the coil 10 increases. The annular flat portion 13 colliding with the collision cover 17 is structurally strong and collides on average. The vibration generated by the collision propagates to the outside.

When the incoming signal is to be notified by vibration, it is driven at a low frequency of several hundred hertz or less to transmit the collision vibration between the annular flat portion 13 and the collision cover 17 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 increase the amplitude of vibration at low frequencies and not to reduce the driving force, the damper 11
Needs to have a flexible configuration having a large compliance in the vertical direction.

The driving current flowing through the coil 10 is devised to increase the vibration level generated when the annular flat portion 13 collides with the collision cover 17 via the elastic member 15, so that the driving force is large only in the collision direction. It is effective to use an alternating current of substantially one polarity so that the current is generated in the coil 10. The direction of the current is uniquely determined by the magnetizing direction of the magnet and the winding method of the coil, and the polarity of the current flowing in the direction of the current is selected.

The current waveform is square wave, trapezoidal wave, SIN
The vibration level at the time of collision is large in the order of waves and triangular waves. However, in the case of a square wave, a sudden change in driving force occurs,
The change in the mechanical deformation stress of the vibrating body is large, and an 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 low, the vibration level will be low.

A trapezoidal wave is similar to a waveform in which the rising and falling slopes of a square wave are alleviated. In the case of a square wave, however, the signal is passed through an integrating circuit to obtain a curved rising 2 and a falling 2 as shown in FIG. As shown in 3, the inclination of the waveform can be reduced. In the case of the second rise, the unnecessary sound having a high frequency component can be suppressed to a level that does not cause any problem simply by setting the slope of the curve to one sixth or less of one cycle until the saturation level A is reached. Of course, falling 3
Is similar to the shape of the rising 1 and inverted. 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.

When the incoming signal is notified by vibration, it is driven at a low frequency of several hundred Hz or less to transmit the collision vibration between the annular flat portion 13 and the collision cover 17 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 increase the amplitude of the vibration at a low frequency and not to reduce the driving force, the damper 11 needs to have a configuration having a large vertical compliance.

In order to further increase the vibration generated outside, it is effective to adopt a structure in which the yoke 9 also collides with the collision cover 17 as shown in FIG. A rubber 20 presses the bottom of the yoke 9 of the magnetic circuit with a rubber bottom 22 and adheres to the collision cover 17 with a rubber end 21. The magnetic circuit including the magnet 7, the plate 8 and the yoke 9 is supported by the tension of the rubber 20.

FIG. 5 shows a state in which a current is applied to the coil 10 and collides with the collision cover 17 via the elastic member 15. Since it is driven at a low frequency, the collision portion of the annular flat portion 13 keeps holding the elastic member 15 for a long time. As a result of this reaction, the magnetic circuit including the yoke 9 separates from the collision cover 17. When the current flowing through the coil 10 rapidly weakens, goes to zero, or changes polarity, the reaction rapidly weakens, goes to zero, or reverses.

In the driving current of FIG. 1, when the current level reaches A or when the current level is A, the force in the direction of collision with the collision cover 17 continues to the coil 10 shown in FIG. 10 keeps holding the elastic member 15 substantially after the collision. As a reaction, the magnetic circuit including the yoke 9 moves away from the collision cover 17 against the tension of the rubber 20. When the current level rapidly approaches the value of zero, the yoke top 19 collides with the collision cover 17 via the rubber end 21 also serving as the elastic material almost at the same time as the coil 10 separates from the elastic material 15, and vibrates to the outside. generate.

As a result of applying a drive current having a waveform that lowers the generation of unnecessary sound and increases the vibration level to the coil 10, the coil 1
When the magnetic circuit including the yoke 9 collides with the vibration generated at the time of the collision caused by the zero, the yoke 9 as shown in FIG. The level of vibration transmitted to the outside can be made higher than that of the collision vibration.
The collision of the magnetic circuit does not cause the generation of many unnecessary sounds including many high frequency components. This is because, as described above, it depends on the vibrator itself.

In order to enhance the effect of the present invention, as shown in FIG.
The spiral-shaped damper 11 is long and thin so that it can cope with the displacement in the vertical direction largely and softly. The rigidity in the width direction is increased to 1 mm or more even if the width is narrow, and the annular flat portion 13 and the coil 1 supported by the plurality of dampers 11 are increased.
It is preferable to make the displacement of the coil 10 and the yoke 9 almost freely up and down by making the deviation from the center of 0 small.

As shown in FIGS. 3, 4 and 6, there is no bobbin for winding the coil 10. In the case of the present invention, since the driving AC current is given a polarity and the driving force in the direction of the collision cover 17 acts on the coil 10, and furthermore, the center of vibration is shifted to the upper side of the collision cover 17. This is because a large peeling force is not applied between the annular flat portion 13 and the coil 10 at the time of collision with the upper elastic material 16, and the reliability of the adhesive strength can be maintained without providing a bobbin. Eliminating the bobbin improves the linearity of the coil and increases vibration and noise.

By imparting polarity to the drive AC current as in the present invention, the center of vibration is shifted to the collision cover 17 side when no drive AC current flows. As a result, the lower end of the coil 10 approaches the plate 8 and the upper end moves away from the plate 8. By making the lower end of the coil 10 protrude from the plate 8 from the upper end when no current is applied,
The driving force by the coil 10 can be made constant and large.

In FIG. 4, the magnet 7, the plate 8 and the yoke 9
Drive frequency is 80H when the magnetic circuit composed of
If the rise and fall of the square wave are reduced by a time constant of about 1.5 milliseconds in z, unnecessary sound when the coil 10 and the yoke 9 alternately collide with the collision cover 17 is low at a practical level, and bodily vibration is reduced. Can be big.

[0041]

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

Using a coil of a vibration actuator for a pager, which is soft and easy to move in the vertical direction, and using a low-frequency alternating current flowing through the coil in the direction of the collision direction, it is possible to efficiently convert a collision due to vibration into vibration energy. Become.

Further, by using a unipolar alternating current, a current driving circuit corresponding to a single power supply becomes easy. Generally, a power supply used for a mobile phone or the like has a single power supply circuit design using a battery of about 3 volts.

Further, to increase the vibration level due to collision, the effect is increased as the rising and falling edges of the low frequency waveform become steeper. The generation of unnecessary sound including many high frequency components becomes remarkable. By relaxing the rising and falling slopes of the square wave to some extent, the generation of the unnecessary sound can be suppressed, and the decrease in the vibration level can be reduced.

The rise and fall of the square wave can be alleviated in a curved manner by passing the square wave through an integrating circuit, and the circuit is simple, and can be easily formed with a resistor and a capacitor. The slope of the curve can be easily adjusted by changing the time constant. It is also possible to respond to trapezoidal waveforms, in which case the circuit configuration is different.

It is natural that the coil is soft and easy to move in the vertical direction. Further, if necessary, the magnetic circuit such as the yoke can be moved in the vertical direction with elastic tension if the displacement is relatively small. This energy is stored as elastic energy of rubber or the like that supports the magnetic circuit and is converted into vibration of a collision at the time of release, so that vibration propagation to the outside can be increased by adding the vibration due to the collision of the coil. Also in this case, increase the vibration level,
In order to prevent the generation of unnecessary sound, it is effective that the driving current flowing through the coil has a polarity that is deviated in the collision direction, and the waveform has a shape in which the rise and fall of the square wave are reduced.

Further, both the coil and the yoke move only in the vertical direction, so that the coil and the yoke collide with a relatively thin and liable resin plate so that the vibration energy can be effectively propagated and the vibration energy can be effectively extracted. . Also, since the starting power is relatively small, power consumption can be reduced.

Although the collision energy is large, the collision sound can be reduced. The reason is that an elastic material is provided in the collision portion, but the effect of using a foamed resin such as urethane foam is particularly great. A conventional vibration motor for a pager generates a sliding sound including a relatively high frequency component, and the vibration level increases as the vibration level increases. However, in the present invention, the high frequency component is small, and the sound level is not necessarily proportional to the vibration level. It does not mean that it becomes large, but it can be suppressed.

The driving alternating current has a polarity, and a driving force in the opposite direction to the magnet and the plate acts mainly on the coil, and the elastic material on the plate is thinner than the elastic material on the collision cover side and has a lower density. Even if it is large, the generation of unnecessary noise at the time of collision can be reduced, and the whole can be made slightly thinner.

Further, in the case of the present invention in which the damper is disposed inside, the diameter of the driving coil is large, and the outer diameter can be reduced for a large driving force. The thickness is 6m
When the thickness is about m, it is highly likely that the thickness when the function of generating vibration and the function of generating sound are shared is acceptable.

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, 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. Of course, no electromagnetic noise is generated because there is no switching of the electrical contacts.

[Brief description of the drawings]

FIG. 1 is a diagram showing a driving AC current of a vibration actuator for a pager according to the present invention.

FIG. 2 is a circuit diagram of an embodiment of the present invention.

FIG. 3 is a sectional view of an actuator used in the present invention.

FIG. 4 is a sectional view of another actuator used in the present invention.

5 is a sectional view of the actuator of FIG. 4 at the time of collision.

FIG. 6 is a partially cutaway perspective view of an actuator used in the present invention.

FIG. 7 is a perspective view of a conventional cylindrical vibration motor for a pager.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Square wave 2 Rise curve 3 Fall curve 4 Square wave transmission circuit 5 Integration circuit 6 Voltage-current conversion circuit 7 Magnet 8 Plate 9 Yoke 10 Coil 11 Damper 12 Damper support part 13 Toroidal flat part 14 Vibration body 15, 16 Elastic material 17 Collision cover 18 Support part 19 Yoke top part 20 Rubber 21 Rubber end part 22 Rubber bottom part

Claims (6)

[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,
When a low-frequency electric signal input causes a part that moves integrally with the vibrating body to collide with a fixed part to generate vibration outside,
A vibration actuator for a pager, wherein a driving force in a collision direction to the fixed portion opposite to the permanent magnet applies an alternating current mainly having a polarity acting on a coil. 2. A magnetic circuit other than a coil comprising a permanent magnet, a yoke, and a plate is supported by a vertically flexible structure, and alternately collides with the coil against the fixed portion to generate vibration to the outside. The vibration actuator for a pager according to claim 1, wherein 3. The vibration actuator for a pager according to claim 1, wherein an alternating current is applied in which the rising and falling slopes of the square wave are alleviated. 4. The vibration actuator for a pager according to claim 3, wherein an alternating current is applied by a circuit in which an integration circuit and a voltage-current conversion circuit are connected after the square wave transmission circuit. 5. A coil having no winding bobbin is adhered to an annular flat portion formed integrally with a plurality of spiral-shaped dampers and resin formed inside. The vibration actuator for a pager according to the above. 6. The vibration actuator for a pager according to claim 1, wherein the coil is wound more around the plate on the permanent magnet side than on the non-permanent magnet side when the alternating current is not applied.