Autofocus actuator
US7285879B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2005 |
| Grant date | Oct 23, 2007 |
| Priority date | — |
| Expiry date | Dec 8, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B3/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An autofocus actuator 1 is provided with a yoke 300 that comprises an inner cylindrical portion 301 defining an insertion bore through which a hollow body portion of a holder is adapted to be received and an outer cylindrical portion 302 provided outside of the inner cylindrical portion 301 with a predetermined spacing left between the inner cylindrical portion 301 and the outer cylindrical portion 302 by a connecting portion, and the yoke 300 is constructed so as to receive a coil 20 in the space of a predetermined gap. The outer cylindrical portion 302 is formed into a generally polygonal cylindrical shape and inner surfaces of the outer cylindrical portion 302 define a plurality of magnet mounting surfaces each having a planar shape. A generally flat plate shape permanent magnet 41 is mounted on each of these magnet mounting surfaces 303. By the use of such a flat plate shape permanent magnet 41, it becomes possible to reduce a manufacturing cost and also possible to easily align and assemble the permanent magnets 41.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.