Patent ID: 10189051

Abstract:
In an exemplary preferred embodiment of the present disclosure, a vibration motor comprises a base portion, a magnet, and a vibrator portion, a cover portion, and an elastic member. The base portion expands perpendicular to a vertical center axis. The magnet is a single member which is fixed to an upper side of the base portion in the vertical direction. The vibrator portion is disposed around the magnet and vibrates in a vertical direction. The cover portion covers upper and side portions of the magnet and the vibrator portion. The cover portion is fixed to the base portion. The elastic member is disposed between an upper inner surface of the cover portion and a top portion of the vibrator portion. The vibrator portion includes a coil portion and a mass portion. The coil portion faces the magnet in a radial direction. The mass portion is fixed to the coil portion. The magnet includes a plurality of magnetic pole pairs and a non-magnetic portion. The plurality of magnetic pole pairs are arranged in the vertical direction. Each of the plurality of magnetic pole pairs has two vertically adjacent magnetic poles having different polarity from each other. The non-magnetic portion is disposed between each of the plurality of magnetic pole pairs in the vertical direction. The polarity of two magnetic poles on both sides vertically adjacent to the non-magnetic portion is identical.