Lens driving device, imaging device using the same, and small-sized electronics device using the same
US7359631B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 21, 2005 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Oct 19, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging device moves a taking lens in an optical-axis direction by a hollow stepping motor of a claw-pole type comprising a disk-shaped hollow magnet and stators. The magnet is disposed in a direction perpendicular to the optical axis. The stators are respectively adjacent to both surfaces of the magnet in the optical-axis direction. When the magnet is rotated, attractive force caused by the respective stators is applied in the optical axis direction. It is prevented that the magnet and a rotary barrel are attracted in the direction perpendicular to the optical axis. Thus, electric power consumption is prevented from increasing due to friction with upper and lower covers, and abnormal noise is prevented from occurring due to the friction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.