Voice coil motor, lens moving device, and imaging apparatus
US10790736B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 2018 |
| Grant date | Sep 29, 2020 |
| Priority date | — |
| Expiry date | May 16, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2205/0069
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A yoke of a voice coil motor includes an outer yoke as a magnet holding portion and an inner yoke as a coil insertion portion. A magnet is fixed to the surface of the outer yoke facing the inner yoke. The inner yoke is inserted into a coil. The coil is formed in a trapezoidal shape where an outer wire length as a wire length of an outer long side is shorter than an inner wire length as a wire length of an inner long side. Since the outer long side is made shorter than the inner long side, an opposite thrust caused by current flowing in the outer long side can be reduced. Accordingly, a reduction in the thrust of the coil is suppressed by as much as the reduced opposite thrust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.