Electromagnetic actuator and image pickup apparatus
US6118644A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 28, 1997 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Oct 28, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An electromagnetic actuator has a large driving force and a good response speed and an image pickup apparatus obtains an image of a high resolution even by using a solid state image pickup device with a small number of pixels. The actuator comprises permanent magnetic field generating units for generating permanent magnetic fields and a current path forming unit which is relatively movable for the permanent magnetic field generating units and forms a current path which crosses the permanent magnetic fields by a current according to an input control signal. The permanent magnetic field generating units of the actuator generate two permanent magnetic fields in the directions which cross each other by, for example, two pairs of magnets. The current path forming unit has two coils each crossing the permanent magnetic field and winding shafts of those coils exist almost on the same line. A driven member is driven by a relative movement between the magnets and the coils by two electromagnetic forces which are generated between the magnets and the coils. In the image pickup apparatus, first and second electromagnetic actuators are driven and controlled by a control unit, a first parallel …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.