Vibration motor for obtaining a starting torque with a small current.

摘要

The present invention is provided with a motor(2) having a rotary shaft(3). A weight(9) is fixed to a motor(2) through guide pins(6) formed to the rotary shaft(3). Each of springs(8) has one end connected to the rotary shaft(3) and the other end connected to the weight(9). The guide pins(3) guide the vertical movement of the weight(9) with respect to the rotary shaft(3). Holes(10) are formed in the weight(9) and the guide pins(6) are pierced therethrough. A hook(7) is formed to a tip of each guide pin(6) to prevent the weight(9) from coming off the guide pins(6) when the weight(9) is rotated. With the above-described arrangement, in the vibration motor(1) according to the present invention, the eccentric quantity of the weight(9) with respect to the rotary shaft(3) becomes small by the springs(8) when the rotation of the weight(9) is started. The starting torque of the motor(2) can be, therefore, small. With the start of the rotation of the weight(9), the eccentric quantity of the weight(9) with respect to the rotary shaft(3) becomes large against the tension of the springs(8) by the centrifugal force of the rotation, and the vibration motor(1) can obtain a sufficient quantity of vibration.