JPH10174408A - Vibrating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the drive energy of a magnet by constituting a device with a spring for regulating the position of a magnet, that is magnetized in an axial direction, a coil for attracting the magnet, and a detector for detecting the positional change of the magnet. SOLUTION: A coil 103 for drive and a coil 104 for detecting the travel of a magnet 101 are wound around a coil frame 102, that is provided at the outer periphery of the magnet 101. The output of the coil 104 is connected to a phase-compensating circuit consisting of a resistor and capacitor. The output of the phase-compensating circuit is connected to the base of the transistor, and the output of the transistor is connected to a drive coil 103. A spring 108 for retaining the magnet 101 is provided in the thrust direction of the magnet 101, and the magnet 101 is mounted to a case lid 109. A case 111 is located at the outer-periphery part of the coils 104 and 103 and accommodates the coils 103 and 104, thus reducing the drive energy of the magnet 101.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration device which transmits vibration to the outside of a device by vibration to give information to a user.

[0002]

2. Description of the Related Art Conventionally, vibration is transmitted to the outside by vibration,
As shown in FIG. 6, an unbalanced weight 3 is attached to the output shaft 2 of the DC motor 1 as a vibration device for giving information to the user, and a vibration is generated by centrifugal force due to the rotation, and the vibration is transmitted to the outside of the device. In general, a vibration motor that gives information to a user has been used.

[0003]

However, this conventional structure requires a motor, and in particular, a motor having a small diameter is required due to the miniaturization and thinning of the equipment. However, the number of parts for constituting the motor is required. However, the cost is high, and in the case of a DC motor, there are wear parts such as brushes.

There is also a method using a brushless motor. However, it is necessary to use an expensive integrated circuit for controlling the motor, which is also very expensive. In order to further reduce the size of equipment, it is necessary to reduce the size of the rotor, brushes and commutators,
Although motors up to about Φ4 are currently in practical use, this is said to be the limit.

[0005]

SUMMARY OF THE INVENTION The present invention provides a magnet magnetized in the axial direction, a spring for regulating the position of the magnet, a coil for attracting the magnet, and a detector for detecting a change in the position of the magnet. And an amplifier for amplifying the output from the detector and a driver for driving the coil for attracting the magnet.

Further, a coil wound near the magnet is used as a detector for detecting a change in the position of the magnet.

Further, as a detector for detecting a change in the position of the magnet, a magnetic detecting element is arranged near the magnet.

[0008] A stopper is provided in the moving direction of the magnet and at a position in contact with the magnet.

(Function) The vibrating device configured as described above
Since the drive is performed while detecting the resonance point between the magnet and the spring, the magnet vibrates at the point where the magnet resonates with the spring, so that an efficient vibration device with very little input energy can be provided.

Further, since the output of the detector is electrically driven without using a contact unlike a DC motor, reliability can be improved.

Further, the driving circuit can be configured very simply, and the cost can be reduced. Further, when the case of the device and the magnet abut directly or indirectly by the movement of the magnet, a larger vibration is generated.

[0012]

FIG. 1 is a sectional view of a vibration motor according to the present invention, and FIG. 2 is a diagram showing a drive circuit of the vibration motor according to the present invention.

In FIG. 1, a coil frame 102 is provided on the outer periphery of a magnet 101, and a coil 103 for driving and a coil 104 for detecting the movement of the magnet 101 are wound around the coil frame 102. The output of the coil 104 is connected to the phase guarantee circuit of the resistor 105 and the capacitor 106 shown in FIG. The output of the phase assurance circuit is connected to the base of the transistor 107, and the output of the transistor 107 is connected to the drive coil 103. Magnet 1
01 is provided with a spring 108 for holding the magnet 101 in the thrust direction.
09. A case 111 is provided on the outer periphery of the coils 104 and 103, and the magnet 101 and the coil 1
03 and 104 are stored.

In this structure, as shown in the circuit diagram of FIG. 2, a control signal is inputted from the outside to the control terminal 110, and this terminal is grounded, whereby the transistor 107 is turned off.
Flows through the resistor 105 and the coil 104, a charging current flows through the capacitor 106, and a large base current of the transistor 107 flows. Then, a large current flows to the collector side of the transistor 107 due to its amplifying action, and excites the drive coil 103. Then, the magnet 101 attacks the spring 108 in FIG. 1 and is pulled by the drive coil 103 to start moving rightward in the figure. Then, a back electromotive force is generated in the detection coil 104. This voltage is connected so as to act in the direction in which the base current of the transistor 107 in FIG. 2 flows. Therefore, the driving coil 1
03 continues to flow. In FIG. 1, the magnet 101 continues to move, but the reaction force increases as the spring 108 is compressed, and the magnet 101 stops. Then, the signal from the detection coil 104 of the magnet 101 disappears, the supply of the base current of the driving transistor 107 in FIG. 2 also decreases, and the driving current of the transistor 107 decreases. The magnet 101 in FIG.
Starts to return to the left in the figure by losing the reaction force. Magnet 1
When 01 starts to return, a counter electromotive force of the opposite polarity is generated in the detection coil 104, and acts in a direction to reduce the base current of the transistor 107 in FIG. Therefore, the driving current of the transistor 107 further decreases, and no current flows through the driving coil 103. When the magnet 101 moves to the left in FIG. 1 and the spring 108 is fully extended, the movement of the magnet 101 stops. Then, the detection coil 104 has no back electromotive force. Further, the magnet 101 is a spring 1
When the tension starts to return due to the contraction force of 08, a counter electromotive force in the positive direction is again generated in the detection coil 104, and the base current of the drive transistor 107 increases. Therefore, the magnet 101 is driven by the drive coil 103 again and starts moving. Thus, the magnet 101 repeats constant vibration. The vibration of the magnet 101 is transmitted to the outside, the vibration is transmitted to the outside of the device on which the vibration device is mounted, and the vibration can be transmitted to the user of the device.
In this case, the magnet 101 is moved in the horizontal direction in FIG.
Vibrates, so that vibration can be generated in the longitudinal direction. When the magnet 101 is completely returned to the left in FIG. 1, if the case 111 is provided with an elastic member, for example, a rubber stopper 112, and it is brought into contact with the stopper, a larger vibration can be generated. .

The case 111 is preferably a part of a main body case of a device on which the vibration device is to be mounted, for example, a mobile phone. Then, the stopper 112 may be formed in the same manner as described above.

FIG. 3 shows another embodiment of the present invention, and is a sectional view of a vibration device. FIG. 4 is a plan sectional view of the vibration device of FIG. The figure shows a five-hole element amplifier circuit.

A spiral leaf spring 117 is provided on the outer periphery of the magnet 101, and a driving coil 103 is wound around the coil frame 102. The Hall element 113 for detecting the movement of the magnet 101 is mounted on a substrate 114 provided below the case 111. The output of the Hall element 113 detects the position of the magnet 101. The output of the Hall element 113 is amplified by an amplifier 115 shown in FIG.
01 speed signal. When this signal is used to drive the drive coil 103 by a circuit similar to that shown in FIG. 2, the magnet 101 starts oscillating in the direction of the arrow 117 in the figure. Therefore, the structure is suitable for a button-type thin type. In this embodiment, the magnet 101 is also used.
It is needless to say that a coil can be used for detecting the movement of the object. Further, when the magnet 101 is completely returned in the upward direction in FIG. 3, if the case 111 is provided with a resilient member, for example, a rubber stopper 112, and is brought into contact with the stopper, a larger vibration can be generated. .

The case 111 is preferably a part of a main body case of a device on which the vibration device is to be mounted, for example, a mobile phone. Then, the stopper 112 may be formed in the same manner as described above.

In the above two embodiments, the magnet 10
1 vibrates at a resonance point with the springs 108 and 117,
Large vibration can be obtained even if the input energy is small.

The above-described vibration device can be widely used in portable electronic devices such as mobile phones, portable watches, pagers, etc., and can greatly contribute to energy saving and miniaturization.

[0021]

As described above, a magnet magnetized in the axial direction, a spring for regulating the position of the magnet, a coil for attracting the magnet, a detector for detecting a change in the position of the magnet, Since it is driven by detecting the vibration of the magnet by comprising an amplifier for amplifying the output from the vessel and a driver for driving the coil for attracting the magnet, the driving energy of the magnet can be extremely reduced.

Further, by using a coil wound near the magnet as a detector for detecting a change in the position of the magnet, the detection coil can be wound on the same bobbin as the drive coil. Is very easy to manufacture, and because it can be detected with a simple coil,
Detection can be performed at low cost.

Further, by arranging a magnetic detecting element as a detector for detecting a change in the position of the magnet in the vicinity of the magnet, the degree of freedom of the position of the detector is increased, and the detection by the coil is further reduced. The size can be reduced.

By moving the magnet, the magnet comes into contact with the case via the stopper, thereby providing an effect that the vibration of the magnet can be increased and transmitted to the outside.

In addition, the shape of the vibrating device can be any shape such as a button type or a cylindrical shape, and the degree of freedom in the direction of vibration can be obtained. Therefore, a free layout of the vibrating device corresponding to the miniaturization of equipment can be obtained. It is done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vibration device according to the present invention.

FIG. 2 is a drive circuit diagram of the vibration device of the present invention.

FIG. 3 is a cross-sectional view of the vibration device of the present invention.

FIG. 4 is a plan sectional view of the vibration device of the present invention.

FIG. 5 is a circuit diagram of a Hall element amplifier according to the present invention.

FIG. 6 is a front view of a conventional vibration device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Magnet 103 Drive coil 104 Detection coil 108 Spring 117 Leaf spring 112 Stopper 113 Hall element

Claims (4)

[Claims] 1. A magnet magnetized in an axial direction, a spring for regulating the position of the magnet, a coil for attracting the magnet, a detector for detecting a change in the position of the magnet, and an output from the detector. A vibration device comprising: an amplifier for amplifying; and a driver for driving the coil for attracting the magnet. 2. The vibration device according to claim 1, wherein a coil wound near the magnet is used as a detector for detecting a change in the position of the magnet. 3. The vibration device according to claim 1, wherein a magnetic detection element is disposed near the magnet as a detector for detecting a change in the position of the magnet. 4. The vibrating device according to claim 1, wherein a stopper is provided in a moving direction of the magnet and at a position in contact with the magnet.