JPH06253499A - Small-sized vibrator - Google Patents

Abstract

PURPOSE:To reduce the size of an apparatus by unbalancing the weight of the rotor itself of a small-sized motor, and generating rotational vibration. CONSTITUTION:The wire diameter of a coil 5c in the vicinity of through hole 8, out of the three coils 5a, 5b, and 5c of a motor 4, is made extremely thinner than those of the other coils 5a and 5b, and the rotational weight of the coil themselves is unbalanced. When DC voltage are applied to terminals 12a and 12b respectively, currents flow in the coils 5a and 5b from a brush 11a and a commutator. The motor 4 rotates by the relation with magnetic 2 and 3, and rotational vibration is generated by the rotation of the rotor 4 whose weight is extremely unbalanced. Consequently, it becomes possible to make a call signal sensed not by the sound of a buzzer, etc., but by vibration to a body. As the result of this, 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. 8 shows a conventional vibrator 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 and is characterized in that the rotational weight balance of the rotating body of a small motor is unbalanced to generate rotational vibration. .

[0005]

The embodiments of the present invention shown in the drawings will be described in detail below. 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, and a through hole 8 is formed along an axis 7 at an eccentric position of the rotating body 4. Among the three coils of the rotating body 4, the wire diameter of the coil 3c in the vicinity of the through hole 8 is made extremely smaller than the wire diameters of the other coils 3a and 3b, and the rotational weight balance of the coil itself is unbalanced. 1
Brushes 1a and 11b are connected to the terminals 12a and 12b. Reference numeral 9 is a bearing, and 13 is a bracket of the terminals 12a and 12b.

Next, the operation will be described. Small DC mode
The DC voltage is applied to each of the terminals 12a and 12b in the same manner as the principle of
A current flows in b, a rotational force is generated in the rotating body 4 due to the relationship with the magnets 2 and 3, and the rotating body 4 having an extremely unbalanced weight rotates to generate rotational vibration.

[0007]

According to the present invention, since the weight of the rotating body of the small motor is unbalanced to generate the rotational vibration, the equipment such as a pager can be downsized.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a right side view of FIG.

FIG. 4 is a front sectional view of the rotating body of FIG.

5 is a left side view of FIG. 4. FIG.

FIG. 6 is a front sectional view in which a coil is wound around a rotating body and a commutator is attached.

FIG. 7 is a left side view of FIG.

8A is a side sectional view showing a conventional example, and FIG. 8B is a front sectional view showing a conventional example.

[Explanation of symbols]

 1 case 2,3 magnet 4 rotating body 5a, 5b, 5c coil 7 axis 8 through hole 9 bearing

Claims (3)

[Claims] 1. A small vibration device, wherein rotational vibration is generated by unbalanced rotational weight balance of a rotary body of a small motor. 2. The small vibrating device according to claim 1, wherein a hole is formed along a shaft center at a position eccentric to the shaft center of the rotor to unbalance the rotational weight of the rotor. 3. The small vibrating device according to claim 1, wherein a part of the plurality of windings wound around the rotating body is formed into a fine wire, and the rotational weight balance is unbalanced.