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    • 10. 发明公开
    • Shape memory alloy actuation apparatus
    • Antriebsvorrichtung mitformgedächtnislegierung
    • EP2261507A1
    • 2010-12-15
    • EP10009263.4
    • 2008-02-11
    • Cambridge Mechatronics Limited
    • Topliss, Richard
    • F03G7/06G03B3/10
    • G03B3/10F03G7/065H04N5/2254H04N5/23212
    • A miniature camera lens actuation apparatus comprises a support structure, a camera lens element (8) supported on the support structure (2) by a suspension system (10); and an SMA actuator connected between the support structure and the movable element (21) to drive movement of the camera lens element. The control circuit may include a drive circuit and a sensor circuit which have separate electrical connections to the SMA actuator to reduce the impact of the resistance of the electrical connections on the sensing. An endstop (3) limits movement to prevent extension of the SMA actuator in its unheated state beyond a maximum length which is at or below the length corresponding the local maximum resistance of the resistance-length curve. Control of position is effected using resistance of the SMA actuator as a measure of position.
    • 微型相机镜头致动装置包括支撑结构,通过悬挂系统(10)支撑在支撑结构(2)上的相机透镜元件(8)。 以及SMA致动器,其连接在所述支撑结构和所述可移动元件(21)之间,以驱动所述相机透镜元件的运动。 控制电路可以包括驱动电路和传感器电路,其具有与SMA致动器的分离的电连接以减少电连接对感测的电阻的影响。 止挡(3)限制运动,以防止SMA致动器在其未加热状态下延伸超过对应于电阻长度曲线的局部最大电阻的长度或以下的最大长度。 使用SMA致动器的电阻作为位置的度量来控制位置。