Electromagnetic drive device for camera
US4466725A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 6, 1983 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | Apr 6, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electromagnetic drive device for a camera includes two exciting coils which have the power supply thereto controllable independent of each other. The two exciting coils are disposed either on the inner or outer side of a lens barrel which carries a photo-taking lens. The direction of magnetic flux formed by each of these two exciting coils is shiftable either to the direction of the optical axis of the photo-taking lens or to a direction perpendicular to the optical axis by controlling the direction of the power supply to these two exciting coils. Shifting the photo-taking lens to an in-focus position and controlling the action of a light quantity control member disposed within the lens barrel can be accomplished independently.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.