Motor and photographing apparatus
US6591066B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2002 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Jun 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
For providing a motor having a reduced length in the axial direction, the motor of the present invention comprises a rotor having a cylindrical magnet having an outer surface divided into portions in a circumferential direction which are alternately magnetized to different poles, a first outer magnetic pole which is excited by a first coil and faces the outer surface of the magnet within a first predetermined angular range, a first inner magnetic pole which is excited by the first coil and faces an inner surface of the magnet, a second outer magnetic pole which is excited by a second coil and faces the outer surface of the magnet within a second predetermined angular range, and a second inner magnetic pole which is excited by the second coil and faces the inner surface of the magnet, wherein the first and second outer magnetic poles are positioned on the same circumference centered on the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.