Vibration motor
US9979258B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 2015 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Dec 8, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K7/061
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A vibration motor, comprising a base part which expands perpendicular to a vertical center axis; a shaft which protrudes upward along the center axis, a lower end of the shaft being coupled to the base part; a circuit board disposed on the base part; coil parts which are attached onto the circuit board, and face each other in a radial direction across the shaft and a gap; a bearing part which is rotatably attached to the shaft at an upper side than the coil parts; a rotor holder which is attached to the bearing part; a magnet part which is attached to the rotor holder; an eccentric weight which is attached to the rotor holder; a spacer which is attached to the shaft at a portion between the bearing part and the coil part, a top surface of the spacer being in contact with a bottom surface of the bearing part; and a cover part which covers at least a portion of the upper and lateral sides of the rotor holder and the eccentric weight, and is fixed to an upper end portion of the shaft and an edge portion of the base part, wherein a bottom surface of the spacer vertically faces a top surface of the coil part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.