JPH06253500A - Small-sized vibrator - Google Patents

Abstract

PURPOSE:To reduce the size of an apparatus by changing the attractive force between a weight of a magnetic substance and a magnet at positions of rotation, and generating rotational vibration by the unbalance between the weight and the magnetic attractive force. CONSTITUTION:A weight 8 of a magnetic substance having extremely unbalanced rotational weight is fixed to one end of a shaft 6, and rotates having a slight gap with the inner peripheral surface 2a of the prolonged part of one magnet 2. When DC voltages are applied to terminals, currents flow in coils, and a rotor 4 rotates by the relation with magnets 2 and 3. Simultaneously with it, the weight 8 rotates and generates attractive force at a point of time when it passes the inner peripheral surface 2a of the prolonged part of the magnet 2, and it becomes possible to obtain stronger rotational vibration. As the result of this, it becomes possible to make a call signal sensed not by the sound of a buzzer etc., but by vibration to a body. Consequently, it becomes possible to reduce the size of the apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating device for receiving a call signal from a pager or the like to generate vibration and to sense the vibration by the body instead of the sound of a buzzer or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional vibrating body such as a pager.
A weight 21 having an extremely unbalanced weight balance was attached to the output shaft 20 of a small-sized motor, and rotational vibration was generated by the rotation of the motor to be sensed.

[0003]

In the prior art described above, since the weight 21 is attached to the output shaft 20 of the motor, it is necessary to widen the gap so as not to come into contact with other parts by rotation. In addition, the weight 21 needs to be increased in order to obtain strong vibration, which is a serious obstacle for a pager or the like that needs to be downsized.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by fixing a weight of a magnetic body having an unbalanced rotational weight balance to a rotating body of a small motor. A magnetic body is fixed to a part of the case facing the rotating circumferential part so as not to come into contact with the weight, and the attraction force between the weight and the magnetic body is changed at the rotational position to remove the weight and the magnetic attraction force. The feature is that rotational vibration is generated in balance.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention shown in the drawings will be described in detail. The magnets 2 and 3 having the inner surface of the arc are fixed to the case 1 of the magnetic body so as to face each other to form a fixed body. Reference numeral 4 denotes a rotating body around which coils 5a, 5b and 5c are wound. A magnetic material weight 8 having an extremely unbalanced rotational weight balance is fixed to one end of the shaft 6 so as to rotate with a slight gap from the inner peripheral surface 2a of the extension of one magnet 2. Has become. Brushes 11a and 11b are connected to the terminals 12a and 12b. 9 is a bearing, 13 is terminals 12a and 12b
It is a bracket.

Next, the operation will be described. Small DC mode
Similarly to the principle of the above, a DC voltage is applied to each of the terminals 12a and 12b, a current flows from the brush 11a and the commutator 7 to the coils 5a and 5b, and the rotating body 4 rotates due to the relationship with the magnets 2 and 3. At the same time, the weight 8 of the magnetic body rotates, and an attractive force is generated when the weight 8 passes through the inner peripheral surface 2a of the extension portion of the magnet 2, so that stronger rotational vibration can be obtained.

[0007]

According to the present invention, a weight of a magnetic material having an unbalanced rotational weight balance is fixed to a rotating body of a small motor, and one of the cases facing the rotating circumferential portion of the weight. Fix the magnetic body so that it does not come into contact with the weight,
The attraction force between the weight and the magnetic body is changed at the rotational position, and the rotational vibration is generated due to the imbalance between the weight and the magnetic attraction force. Therefore, the rotation vibration is stronger than the conventional weight. Therefore, it is possible to reduce the size compared to the case where the same vibration is obtained, and it is possible to reduce the size of equipment such as a pager.

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

4A is a side sectional view showing a conventional example, and FIG. 4B is a front sectional view showing a conventional example.

[Explanation of symbols]

 1 case 2,3 magnet 2a extension part inner peripheral surface of magnet 2 4 rotor 5a, 5b, 5c coil 6 axis 8 weight of magnetic body

Claims (1)

[Claims] 1. A weight of a magnetic body having an unbalanced rotational weight balance is fixed to a rotating body of a small motor, and the weight is attached to a part of a case facing a rotating circumferential portion of the weight. A small vibrating device characterized in that a magnetic body is fixed so as not to come into contact with the magnetic body, and a suction force between the weight and the magnetic body is changed at a rotational position so that rotational vibration is generated by an imbalance between the weight and the magnetic suction force. .