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1. 发明申请

US20100060776A1 SHAPE MEMORY ALLOY ACTUATION APPARATUS 有权
标题翻译：形状记忆合金执行装置
公开(公告)号：US20100060776A1
公开(公告)日：2010-03-11
申请号：US12525906
申请日：2008-02-11
申请人： Richard Topliss , Dominic George Webber , Robert John Leedham , Anthony Hooley , David Charles Wilson Richards , Thomas Matthew Gregory
发明人： Richard Topliss , Dominic George Webber , Robert John Leedham , Anthony Hooley , David Charles Wilson Richards , Thomas Matthew Gregory
IPC分类号： H04N5/225 , F03G7/06 , G03B3/10
CPC分类号： G03B3/10 , F03G7/065 , H04N5/2254 , H04N5/23212
摘要： A miniature camera lens actuation apparatus comprises a support structure, a camera lens element supported on the support structure by a suspension system; and an SMA actuator connected between the support structure and the movable element 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. The control circuit may vary the drive signal in response to a temperature signal indicative of the ambient temperature. An endstop 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. The control employs a ‘ratcheting’ method to prevent a failure condition and an initial calibration step to derive a range of target resistance values. In manufacture, the position of a lens holder is adjusted relative to a carrier to provide focussing on the image sensor of an image of an object at a distance in the range from infinity to the hyperfocal distance when the SMA actuator is heated to a predetermined temperature greater than ambient temperature.
摘要翻译：微型相机镜头致动装置包括支撑结构，通过悬挂系统支撑在支撑结构上的照相机镜头元件; 以及SMA致动器，其连接在所述支撑结构和所述可移动元件之间，以驱动所述相机透镜元件的移动。控制电路可以包括驱动电路和传感器电路，其具有到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。控制电路可以响应于指示环境温度的温度信号来改变驱动信号。止挡限制运动，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。控制采用“棘轮”方法来防止故障条件和初始校准步骤导出目标电阻值的范围。在制造中，相对于载体调整透镜保持器的位置，以便在将SMA致动器加热到预定温度时，在从无穷远到超焦距离的范围内距离处的物体的图像的图像传感器上聚焦大于环境温度。

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