Focus controller, optical apparatus using the same, and control method
US7734167B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2008 |
| Grant date | Jun 8, 2010 |
| Priority date | — |
| Expiry date | Dec 30, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A focus controller configured to control focus of an optical system that has a focus lens includes a switching circuit configured to select a first driver for the electrization to a coil of a motor in performing focus control using a first focus detector, and to select a second driver in an electrization to the coil of the motor in performing focus control using a second focus detector. The first driver is configured to switch an electrization to the coil in the motor according to an output of the position sensor. The second driver is configured to switch an electrization to the coil of the motor according to a determined time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.