Drive unit and image pickup unit equipped with the drive unit
US7274120B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2005 |
| Grant date | Sep 25, 2007 |
| Priority date | — |
| Expiry date | Sep 21, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K37/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive unit for performing precise linear movement of a driven object comprises a motor having a cylindrical stator and a cylindrical rotor that is coaxially put in the cylindrical stator and capable of rotating relatively to the cylindrical stator, a movable barrel for holding a driven object mounted for rotation in the cylindrical rotor, a motion transformation mechanism comprising an internal helical groove formed in the cylindrical rotor and an external helical thread formed on the movable barrel which engage with each other so as to cause relative rotation between the cylindrical rotor and the movable barrel when the cylindrical rotor rotates, thereby transforming rotational movement of the rotor into a linear movement of the movable barrel, and a head-on striking structure provided between the helical groove and the helical thread to restrict the relative rotation at an intended extreme end of an axial path of the movable barrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.