Camera device, interchangeable lens device, camera main body, and focus control method
US8953090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2012 |
| Grant date | Feb 10, 2015 |
| Priority date | — |
| Expiry date | Feb 28, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2205/0007
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A lens controller of a camera device includes: a driving amount calculator that samples, for each first time period, a lens position signal indicating a lens position detected by a lens position detector and a target position signal indicating a target position of a focus lens on an optical axis transmitted from a control unit and calculates a driving amount output of the focus lens based on the sampled lens position signal and target position signal; an up-sampling unit that performs up-sampling on the driving amount output obtained by the driving amount calculator at a second time period which is a period obtained by dividing the first time period by an integer; and a resonance suppression calculator that performs calculation on a result obtained by sampling the driving amount output at the second time period to suppress a higher-order resonant frequency component in a specified resonant frequency band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.