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公开(公告)号：US20110277462A1
公开(公告)日：2011-11-17
申请号：US13126401
申请日：2009-10-29
申请人： Thomas Matthew Gregory , Robert John Leedham , David Charles William Richards , Richard Topliss
发明人： Thomas Matthew Gregory , Robert John Leedham , David Charles William Richards , Richard Topliss
IPC分类号： F01B29/10
CPC分类号： F03G7/065 , G03B3/10 , H04N5/2254 , H04N5/2257
摘要： An SMA actuation apparatus comprises: an SMA actuator arranged to drive movement of a movable element; a current supply supplying a drive current; a detection circuit detecting a measure of the resistance of the SMA actuator; and a control unit operative to generate a closed-loop control signal supplied to current supply for controlling the power of the drive current to drive the resistance of the SMA actuator to a target value. The control unit derives: an estimate of a characteristic temperature of the SMA actuation apparatus on the basis of the supplied power, using a thermal model; and a resistance offset on the basis thereof. The closed-loop control signal is generated on the basis of the error between the measure of the resistance of the SMA actuator and the target value of the resistance of the SMA actuator, adjusted by the resistance offset to compensate for variations in resistance.
摘要翻译： SMA致动装置包括：SMA致动器，被布置成驱动可移动元件的运动; 提供驱动电流的电流源; 检测所述SMA致动器的电阻的测量电路; 以及控制单元，用于产生提供给电流源的闭环控制信号，以控制驱动电流的功率以将SMA致动器的电阻驱动到目标值。 控制单元使用热模型来估计基于所提供的功率的SMA致动装置的特征温度; 和基于其的电阻偏移。 基于SMA致动器的电阻的测量与SMA致动器的电阻的目标值之间的误差产生闭环控制信号，由电阻偏移调整以补偿电阻的变化。
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公开(公告)号：US08756933B2
公开(公告)日：2014-06-24
申请号：US12745784
申请日：2008-12-03
申请人： Richard Topliss , Robert John Leedham , David Charles William Richards , Thomas Matthew Gregory
发明人： Richard Topliss , Robert John Leedham , David Charles William Richards , Thomas Matthew Gregory
摘要： An SMA actuation arrangement comprises: an SMA actuator arranged on contraction caused by heating to drive movement of a movable element relative to a support structure; a current source operative to supply drive current through the SMA actuator to heat the SMA actuator; and a detector circuit operative to detect a measure of the resistance of the SMA actuator. While detecting a measure of the resistance of the SMA actuator and controlling the drive current on the basis of the measure of the resistance of the SMA actuator; there is derived a measure of an electrical characteristic of the SMA actuator that is representative of the ambient temperature. While applying closed-loop control an offset is added to the control signal which reduces the steady-state value of an error between the measure of the resistance of the SMA actuator and a target value. While applying open-loop control, the control signal is generated taking into account the electrical characteristics of the SMA actuator measured during a calibration stage.
摘要翻译： SMA致动装置包括：SMA致动器，其被布置为由加热引起的收缩，以驱动可移动元件相对于支撑结构的运动; 电流源，用于通过SMA致动器提供驱动电流以加热SMA致动器; 以及检测器电路，用于检测SMA致动器的电阻的测量。 同时检测SMA致动器电阻的测量值，并根据SMA执行器电阻的测量值来控制驱动电流; 导出了代表环境温度的SMA致动器的电气特性的测量。 在施加闭环控制的同时，控制信号增加了一个偏移量，从而降低了SMA执行机构电阻测量值与目标值之间误差的稳态值。 在应用开环控制的同时，考虑到在校准阶段测量的SMA致动器的电气特性，产生控制信号。
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公开(公告)号：US08448435B2
公开(公告)日：2013-05-28
申请号：US13126401
申请日：2009-10-29
申请人： Thomas Matthew Gregory , Robert John Leedham , David Charles William Richards , Richard Topliss
发明人： Thomas Matthew Gregory , Robert John Leedham , David Charles William Richards , Richard Topliss
CPC分类号： F03G7/065 , G03B3/10 , H04N5/2254 , H04N5/2257
摘要： An SMA actuation apparatus comprises: an SMA actuator arranged to drive movement of a movable element; a current supply supplying a drive current; a detection circuit detecting a measure of the resistance of the SMA actuator; and a control unit operative to generate a closed-loop control signal supplied to current supply for controlling the power of the drive current to drive the resistance of the SMA actuator to a target value. The control unit derives: an estimate of a characteristic temperature of the SMA actuation apparatus on the basis of the supplied power, using a thermal model; and a resistance offset on the basis thereof. The closed-loop control signal is generated on the basis of the error between the measure of the resistance of the SMA actuator and the target value of the resistance of the SMA actuator, adjusted by the resistance offset to compensate for variations in resistance.
摘要翻译： SMA致动装置包括：SMA致动器，被布置成驱动可移动元件的运动; 提供驱动电流的电流源; 检测所述SMA致动器的电阻的测量电路; 以及控制单元，用于产生提供给电流源的闭环控制信号，以控制驱动电流的功率以将SMA致动器的电阻驱动到目标值。 控制单元使用热模型来估计基于所提供的功率的SMA致动装置的特征温度; 和基于其的电阻偏移。 基于SMA致动器的电阻的测量与SMA致动器的电阻的目标值之间的误差产生闭环控制信号，由电阻偏移调整以补偿电阻的变化。
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公开(公告)号：US08446475B2
公开(公告)日：2013-05-21
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 William Richards , Thomas Matthew Gregory
发明人： Richard Topliss , Dominic George Webber , Robert John Leedham , Anthony Hooley , David Charles William Richards , Thomas Matthew Gregory
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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公开(公告)号：US20100275592A1
公开(公告)日：2010-11-04
申请号：US12745784
申请日：2008-12-03
申请人： Richard Topliss , Robert John Leedham , David Charles William Richards , Thomas Matthew Gregory
发明人： Richard Topliss , Robert John Leedham , David Charles William Richards , Thomas Matthew Gregory
IPC分类号： F03G7/06
摘要： An SMA actuation arrangement comprises: an SMA actuator arranged on contraction caused by heating to drive movement of a movable element relative to a support structure; a current source operative to supply drive current through the SMA actuator to heat the SMA actuator; and a detector circuit operative to detect a measure of the resistance of the SMA actuator. Whilst detecting a measure of the resistance of the SMA actuator and controlling the drive current on the basis of the measure of the resistance of the SMA actuator; there is derived a measure of an electrical characteristic of the SMA actuator that is representative of the ambient temperature. Whilst applying closed-loop control an offset is added to the control signal which reduces the steady-state value of an error between the measure of the resistance of the SMA actuator and a target value. Whilst applying open-loop control, the control signal is generated taking into account the electrical characteristics of the SMA actuator measured during a calibration stage.
摘要翻译： SMA致动装置包括：SMA致动器，其被布置为由加热引起的收缩，以驱动可移动元件相对于支撑结构的运动; 电流源，用于通过SMA致动器提供驱动电流以加热SMA致动器; 以及检测器电路，用于检测SMA致动器的电阻的测量。 同时检测SMA致动器的电阻的测量值，并根据SMA致动器电阻的测量来控制驱动电流; 导出了代表环境温度的SMA致动器的电气特性的测量。 在施加闭环控制的同时，控制信号被添加到减少SMA致动器的电阻的测量值与目标值之间的误差的稳态值。 在施加开环控制的同时，考虑到在校准阶段期间测量的SMA致动器的电特性，产生控制信号。
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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
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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公开(公告)号：US20090295986A1
公开(公告)日：2009-12-03
申请号：US12295382
申请日：2007-03-23
IPC分类号： H04N5/225
摘要： A camera lens actuation apparatus for driving motion of a camera lens supported on a support structure by a suspension system. The apparatus incorporates a subassembly comprising SMA wire connected to at least one mounting member which is mounted to the support structure. At least one pair of lengths of SMA wire are held in tension between the camera lens element and the support structure at respective acute angles to the optical axis applying a tensional force having a component along the optical axis. The lengths of SMA wire in the pair are held at angle as viewed along the optical axis. There may be plural pairs with a balanced arrangement in which the forces generated have no net component perpendicular to the optical axis and generate no net torque around any axis perpendicular to the optical axis. A control circuit controls heating of the SMA wire in response to a measure of its resistance.
摘要翻译： 一种用于通过悬挂系统驱动支撑在支撑结构上的相机镜头的运动的相机镜头致动装置。 该装置包括一个子组件，该子组件包括连接到至少一个安装到支撑结构上的安装构件的SMA线。 至少一对长度的SMA线在照相机透镜元件和支撑结构之间以相对于光轴的锐角保持张力，施加具有沿着光轴的分量的张力。 一对SMA中的SMA线的长度保持为沿着光轴的角度。 可以存在具有平衡布置的多对，其中产生的力没有垂直于光轴的网分量，并且不围绕垂直于光轴的任何轴线产生净转矩。 控制电路响应于其电阻的测量来控制SMA线的加热。
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公开(公告)号：US20110249131A1
公开(公告)日：2011-10-13
申请号：US13063661
申请日：2009-09-11
IPC分类号： H04N5/228
CPC分类号： G03B5/00 , G02B27/646 , G03B2205/0007 , G03B2205/0076 , H04N5/23248
摘要： A camera apparatus capable of providing optical image stabilisation comprises: a support structure; a camera unit comprising an image sensor and a lens system; a suspension system comprising a plurality of flexure elements supporting the camera unit on the support structure in a manner allowing the camera unit to tilt; and a plurality of SMA actuators each formed as SMA wire connected between the camera unit and the support structure and arranged on contraction to drive tilting of the camera unit. The SMA wire may be fixed to the camera unit at its ends and hooked over an element of the support structure. A vibration sensor, whose output is used as the basis for generating drive signals, may be mounted on the camera unit.
摘要翻译： 能够提供光学图像稳定性的相机装置包括：支撑结构; 包括图像传感器和透镜系统的相机单元; 一种悬挂系统，包括以允许相机单元倾斜的方式在支撑结构上支撑相机单元的多个挠曲元件; 以及多个SMA致动器，每个SMA致动器形成为连接在相机单元和支撑结构之间的SMA线，并且被布置成收缩以驱动相机单元的倾斜。 SMA线可以在其端部固定到相机单元并且钩在支撑结构的元件上。 其输出用作产生驱动信号的基础的振动传感器可以安装在相机单元上。
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公开(公告)号：US08848064B2
公开(公告)日：2014-09-30
申请号：US13063661
申请日：2009-09-11
CPC分类号： G03B5/00 , G02B27/646 , G03B2205/0007 , G03B2205/0076 , H04N5/23248
摘要： A camera apparatus capable of providing optical image stabilization comprises: a support structure; a camera unit comprising an image sensor and a lens system; a suspension system comprising a plurality of flexure elements supporting the camera unit on the support structure in a manner allowing the camera unit to tilt; and a plurality of SMA actuators each formed as SMA wire connected between the camera unit and the support structure and arranged on contraction to drive tilting of the camera unit. The SMA wire may be fixed to the camera unit at its ends and hooked over an element of the support structure. A vibration sensor, whose output is used as the basis for generating drive signals, may be mounted on the camera unit.
摘要翻译： 能够提供光学图像稳定性的相机装置包括：支撑结构; 包括图像传感器和透镜系统的相机单元; 一种悬挂系统，包括以允许相机单元倾斜的方式在支撑结构上支撑相机单元的多个挠曲元件; 以及多个SMA致动器，每个SMA致动器形成为连接在相机单元和支撑结构之间的SMA线，并且被布置成收缩以驱动相机单元的倾斜。 SMA线可以在其端部固定到相机单元并且钩在支撑结构的元件上。 其输出用作产生驱动信号的基础的振动传感器可以安装在相机单元上。
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公开(公告)号：US08350959B2
公开(公告)日：2013-01-08
申请号：US12295382
申请日：2007-03-23
摘要： A camera lens actuation apparatus for driving motion of a camera lens supported on a support structure by a suspension system. The apparatus incorporates a subassembly comprising SMA wire connected to at least one mounting member which is mounted to the support structure. At least one pair of lengths of SMA wire are held in tension between the camera lens element and the support structure at respective acute angles to the optical axis applying a tensional force having a component along the optical axis. The lengths of SMA wire in the pair are held at angle as viewed along the optical axis. There may be plural pairs with a balanced arrangement in which the forces generated have no net component perpendicular to the optical axis and generate no net torque around any axis perpendicular to the optical axis. A control circuit controls heating of the SMA wire in response to a measure of its resistance.
摘要翻译： 一种用于通过悬挂系统驱动支撑在支撑结构上的相机镜头的运动的相机镜头致动装置。 该装置包括一个子组件，该子组件包括连接到至少一个安装到支撑结构上的安装构件的SMA线。 至少一对长度的SMA线在照相机透镜元件和支撑结构之间以相对于光轴的锐角保持张力，施加具有沿着光轴的分量的张力。 一对SMA中的SMA线的长度保持为沿着光轴的角度。 可以存在具有平衡布置的多对，其中产生的力没有垂直于光轴的网分量，并且不围绕垂直于光轴的任何轴线产生净转矩。 控制电路响应于其电阻的测量来控制SMA线的加热。
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