Electromagnetic driving device for a camera
US4396267A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1981 |
| Grant date | Aug 2, 1983 |
| Priority date | — |
| Expiry date | Dec 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B3/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electromagnetic driving device for a camera having a first state for performing a focus adjusting operation of the objective lens by detecting the object distance which is followed after the termination of this focus adjusting operation, by a second state for initiating an exposure operation. A driven member is movable from an initial position in either 1st or 2nd direction by controlling the direction of current flow to a coil positioned in a magnetic field of permanent magnets. Movement of this driven member in the 1st direction controls the focus adjusting operation, and movement in the 2nd direction controls the exposure operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.