Vibration motor
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United States of America Patent
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-
Oct 24, 2017
Issued Date -
N/A
app pub date -
Dec 2, 2014
filing date -
Apr 4, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vibration motor includes an eccentric weight whose center of gravity is positioned outside a shaft and a holder made of resin and holding a ring-shaped back yoke and the eccentric weight. The back yoke includes an overhang portion which extends farther inward in a radial direction than an inner side edge of the opening of a rotor magnet. The holder includes a penetrated portion which is a tube-shaped portion positioned at an axially inner side of the rotor magnet and extends in the axial direction surrounding the shaft, an upper surface portion which expands radially outwardly from an upper side of the penetrated portion to cover an upper surface of the eccentric weight, and a lower surface portion which expands radially outwardly from the lower side of the penetrated portion to cover a lower surface of the overhang portion.
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