Lens driving device
US5918078A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1997 |
| Grant date | Jun 29, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B13/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens driving device is disclosed, whereby it is made unnecessary for a user side to determine focusing when focusing is to be performed by an operation ring in a manual preference automatic focusing mode. The lens driving device includes an operation ring rotated for performing automatic focusing, a rotary encoder for detecting the operation amount of the operation ring, a motor for performing lens driving according to an operation amount detected by the rotary encoder, a body side CPU for detecting a defocusing amount at least during lens driving and a lens side CPU for forcibly stopping the lens driving of the motor when a defocusing amount detected by the body side CPU becomes equal to a preset value or lower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.