| 摘要 |
A focus controller configured to control focus of an optical element includes a focus state detector configured to detect a focus state based on a contrast value of an image formed by the optical element, and a driving mechanism that moves the optical element including a motor, a position sensor configured to detect a position of a rotor in the motor, and a driving controller configured to select, in accordance with the contrast value, first driving configured to switch an electrization to a coil in accordance with an output of the position senor, or second driving configured to switch the electrization to the coil in the motor in accordance with a determined time interval.
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