Motor driven focal length changing device for a camera
US4601563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1984 |
| Grant date | Jul 22, 1986 |
| Priority date | — |
| Expiry date | Oct 25, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In the automatic film transportation type camera using an electric motor in which upon a forward rotation thereof the film is wound and upon a reversed rotation thereof the film is rewound, a mechanism for moving a photographic lens barrel between a standard or wide angle setting and a telephoto setting is provided with a clutch capable of transferring the motion of the motor from a rewind fork to the moving mechanism, and a switch arranged to be closed when the clutch is cut off, thereby the motor is energized to rotate in the reverse direction, driving the barrel to move axially from one of the settings to the other, while leaving the rewind fork stationary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.