| 摘要 |
An autofocus system which can be applied even to small apparatuses is provided, and an improvement in accuracy of measurement of the positions of lenses when a piezo actuator is used to control the positions of the lenses is achieved. An autofocus system comprises a camera lens support, a piezo actuator, stoppers, and pressure sensors, wherein the camera lens support supports camera lenses, the piezo actuator moves the camera lens support for autofocusing, the stoppers prevent excessive movement of the camera lenses moved by the piezo actuator, and the pressure sensors are situated in the vicinities of the stoppers and detect collision with the camera lenses moved by the piezo actuator.
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