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    • 5. 发明申请
    • SHAPE MEMORY ALLOY ACTUATION APPARATUS
    • 形状记忆合金致动装置
    • WO2009056822A2
    • 2009-05-07
    • PCT/GB2008003657
    • 2008-10-28
    • CAMBRIDGE MECHATRONICS LTDTOPLISS RICHARDWEBBER DOMINIC GEORGE
    • TOPLISS RICHARDWEBBER DOMINIC GEORGE
    • F03G7/06
    • F03G7/065G02B7/08G03B3/10H04N5/2257
    • A shape memory alloy actuation apparatus comprises a movable element supported on a support structure by a suspension system comprising a plurality of resilient flexures. A shape memory alloy actuator drives movement of the movable element on contraction. An end-stop limits the movement of the movable element in the opposite direction. Rather than using the resilient flexures of the suspension system as the sole biassing means, an additional Massing element biasses the movable element against the SMA actuator. When the moveable element is held against the end-stop, the force applied by the biassing element is greater than the force applied by the flexures of the suspension system. This reduces the design constraints, for example allowing a greater range of movement.
    • 一种形状记忆合金驱动装置包括通过包括多个弹性挠曲件的悬挂系统支撑在支撑结构上的可移动元件。 形状记忆合金致动器在收缩时驱动可动元件的运动。 终点挡块限制可移动元件在相反方向上的移动。 除了使用悬挂系统的弹性挠曲作为唯一的偏置装置之外,另外的Massing元件偏置可动元件抵靠SMA致动器。 当可动元件保持抵靠端部止动件时,由偏置元件施加的力大于由悬架系统的挠曲部施加的力。 这减少了设计限制,例如允许更大范围的移动。
    • 6. 发明申请
    • SHAPE MEMORY ALLOY ACTUATION APPARATUS
    • 形状记忆合金致动装置
    • WO2008099156A3
    • 2008-11-20
    • PCT/GB2008000478
    • 2008-02-11
    • 1 LTDTOPLISS RICHARDWEBBER DOMINIC GEORGELEEDHAM ROBERT JOHNHOOLEY ANTHONYRICHARDS DAVID CHARLES WILSONGREGORY THOMAS MATTHEW
    • TOPLISS RICHARDWEBBER DOMINIC GEORGELEEDHAM ROBERT JOHNHOOLEY ANTHONYRICHARDS DAVID CHARLES WILSONGREGORY THOMAS MATTHEW
    • F03G7/06G03B3/10
    • G03B3/10F03G7/065H04N5/2254H04N5/23212
    • 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.
    • 微型摄像机镜头驱动装置包括支撑结构,通过悬架系统支撑在支撑结构上的摄像机镜头元件; 以及连接在所述支撑结构和所述可移动元件之间以驱动所述照相机镜头元件的移动的SMA致动器。 控制电路可以包括驱动电路和传感器电路,其具有到SMA致动器的单独电连接以减少电连接的电阻对感测的影响。 控制电路可以响应于表示环境温度的温度信号来改变驱动信号。 止动器限制运动以防止SMA致动器在其未加热状态下延伸超过最大长度,该最大长度等于或低于与电阻 - 长度曲线的局部最大电阻相对应的长度。 使用SMA致动器的电阻作为位置的测量来控制位置。 控制采用“棘轮”方法来防止故障情况,并采用初始校准步骤来导出一系列目标电阻值。 在制造中,相对于载体调整透镜架的位置,以在SMA致动器被加热到​​预定温度时在距无穷远到超焦距的范围内的距离处将物体的图像聚焦在图像传感器上 大于环境温度。
    • 7. 发明申请
    • SHAPE MEMORY ALLOY ACTUATION APPARATUS
    • 形状记忆合金执行装置
    • WO2008099156A2
    • 2008-08-21
    • PCT/GB2008/000478
    • 2008-02-11
    • 1...LIMITEDTOPLISS, RichardWEBBER, Dominic, GeorgeLEEDHAM, Robert, JohnHOOLEY, AnthonyRICHARDS, David, Charles, WilsonGREGORY, Thomas, Matthew
    • TOPLISS, RichardWEBBER, Dominic, GeorgeLEEDHAM, Robert, JohnHOOLEY, AnthonyRICHARDS, David, Charles, WilsonGREGORY, Thomas, Matthew
    • F03G7/06G03B3/10
    • G03B3/10F03G7/065H04N5/2254H04N5/23212
    • 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.
    • 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,其连接在支撑结构和可移动元件之间,以驱动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。 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”方法来防止故障状况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。