CAMERA DEVICE, REPLACEMENT LENS DEVICE, CAMERA MAIN BODY, AND FOCUS CONTROL METHOD

摘要

A lens controller 312 of a camera system 1 samples a lens position signal inputted from a lens position detector 307 and a target position signal transmitted from a main body unit 2 for each first time period. The lens controller 312 includes a phase compensation calculator 408 that calculates a driving amount signal based on the sampled lens position signal and target position signal, an up-sampling unit 409 that performs up-sampling on the driving amount signal at a second time period which is a period obtained by dividing the first time period by an integer, and a resonance suppression calculator 410 that performs a calculation to suppress a higher-order resonant frequency component in a specified resonant frequency band on the driving amount signal up-sampled by the up-sampling unit 409.