| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor controller which can perform rotation control without causing resonant oscillation leading to problems, and to provide a lens-barrel and a camera using the same.SOLUTION: An AF motor drive 30 includes an operation unit 31, a motor drive circuit 32, and a resonance detection unit 33 having an acceleration sensor 33A for detecting an oscillation acting on an AF motor 23B. The AF motor drive 30 determines that the AF motor 23B is in resonance state if the output from the acceleration sensor 33A in the resonance detection unit 33 goes above a predetermined value (threshold) in the operation unit 31, and controls the drive pulse frequency of the AF motor 23B output from the motor drive circuit 32 so as to avoid resonance. |
