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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：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：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：US08594350B2
公开(公告)日：2013-11-26
申请号：US10540255
申请日：2004-01-19
申请人： Anthony Hooley , Paul Thomas Troughton , David Charles William Richards , David Christopher Turner
发明人： Anthony Hooley , Paul Thomas Troughton , David Charles William Richards , David Christopher Turner
IPC分类号： H04R5/02
CPC分类号： H04S7/301 , H04R1/403 , H04R3/12 , H04R2203/12 , H04R2205/022
摘要： An example set-up method for a loudspeaker system capable of generating at least one directed beam of audio sound includes emitting directional beams of set-up sound signals from the loudspeaker system into a room, registering at least one reflection of the emitted signals at one or more locations within the room, and evaluating the registered reflected signals to obtain data for use in configuring the surround sound system.
摘要翻译： 能够产生至少一个定向声音声音的扬声器系统的示例性设置方法包括：从扬声器系统向室内发射建立声音信号的定向波束，将发射信号的至少一个反射记录在一个 或更多的位置，并且评估所登记的反射信号以获得用于配置环绕声系统的数据。
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公开(公告)号：US06405230B1
公开(公告)日：2002-06-11
申请号：US09285402
申请日：1999-04-02
IPC分类号： G06F1710
CPC分类号： H03H17/04
摘要： A method of generating filter coefficients to provide a desired nth order filter response comprises adding one or more substantially co-located pole and zero pairs to form an (n+m)th order filter having the desired nth order filter response.
摘要翻译： 产生滤波器系数以提供期望的第n阶滤波器响应的方法包括添加一个或多个基本上共位的极点和零对以形成具有期望的第n阶滤波器响应的（n + m）阶滤波器。
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