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    CAMERA ASSEMBLY PROVIDING OPTICAL IMAGE STABILISATION
    2.
    发明申请
    CAMERA ASSEMBLY PROVIDING OPTICAL IMAGE STABILISATION 有权

    公开(公告)号：US20220035176A1

    公开(公告)日：2022-02-03

    申请号：US17504790

    申请日：2021-10-19

    Applicant: CAMBRIDGE MECHATRONICS LIMITED

    Inventor： Andrew Benjamin David Brown

    IPC: G02B27/64 ,  H04N5/232 ,  H04N5/225

    Abstract: A camera assembly comprises a support structure and an image sensor mounted on a carrier that is suspended on the support structure by at least one plain bearing that allows movement of the carrier and the image sensor relative to the support structure in any direction laterally to the light-sensitive region of the image sensor. An actuator arrangement comprising plural shape memory alloy wires is arranged to move the carrier and the image sensor relative to the support structure for providing optical image stabilisation of the image captured by the image sensor.

    Control of an SMA actuation apparatus
    3.
    发明授权
    Control of an SMA actuation apparatus 有权

    公开(公告)号：US09684183B2

    公开(公告)日：2017-06-20

    申请号：US14442442

    申请日：2013-11-11

    Applicant: CAMBRIDGE MECHATRONICS LIMITED

    Inventor： Andrew Benjamin David Brown ,  Thomas Matthew Gregory

    IPC: G02B27/64 ,  F03G7/06 ,  G03B5/00 ,  G03B3/10 ,  H04N5/232

    CPC classification number: G02B27/646 ,  F03G7/065 ,  G03B3/10 ,  G03B5/00 ,  G03B2205/0076 ,  H04N5/2328

    Abstract: SMA actuator wires in an SMA actuation apparatus are connected in tension between a movable element and a support structure, applying forces to the movable element in opposed directions. Measures of the resistances of the SMA actuator wires are detected. A feedback difference measure is derived being the sum of the measures of resistance of the SMA actuator wires, relatively scaled by factors, in respect of the SMA actuator wires, the magnitude of which represents a component along the predetermined axis of a force applied by the SMA actuator wire and the sign of which represents a direction along the predetermined axis. The ratio has opposite signs for respective ones of said opposed directions. The powers of drive signals supplied to the SMA actuator wires are controlled in response to the feedback difference measure to reduce the difference between the feedback difference measure and a target difference measure.

    Suspension system for a camera lens element
    4.
    发明授权
    Suspension system for a camera lens element 有权

    公开(公告)号：US09609219B2

    公开(公告)日：2017-03-28

    申请号：US14647405

    申请日：2013-11-20

    Applicant: CAMBRIDGE MECHATRONICS LIMITED

    Inventor： James Howarth ,  Andrew Benjamin David Brown

    IPC: H04N5/232 ,  G02B7/02 ,  G02B13/00 ,  G02B27/64

    CPC classification number: H04N5/23258 ,  G02B7/023 ,  G02B7/026 ,  G02B13/001 ,  G02B27/646 ,  H04N5/23287

    Abstract: A camera lens element is suspended on a support structure by balls that allow movement of the camera lens elementorthogonal to the optical axis and plural flexures connected between the support structure and the camera lens element to bias them against the balls while permitting said movement of the camera lens elementorthogonal to the optical axis. Lateral movement is driven by a lateral actuation arrangement comprising plural SMA actuator wires. The flexures provide a lateral biasing force that biases the camera lens element towards a central position. An electrical connection is made through the flexures from the support structure to the camera lens element. The flexures may be connected to laminated structures.

    SHAPE MEMORY ALLOY ACTUATION APPARATUS
    5.
    发明申请
    SHAPE MEMORY ALLOY ACTUATION APPARATUS 有权
    形状记忆合金执行装置

    公开(公告)号：US20150135703A1

    公开(公告)日：2015-05-21

    申请号：US14402576

    申请日：2013-05-21

    Applicant: CAMBRIDGE MECHATRONICS LIMITED

    Inventor： Robin Eddington ,  James Howarth ,  Andrew Benjamin David Brown

    IPC: F03G7/06

    CPC classification number: F03G7/065 ,  G02B27/646 ,  G03B5/00 ,  G03B2205/0015 ,  G03B2205/0076 ,  H04N5/23287

    Abstract: An SMA actuation apparatus moves a movable element relative to a support structure in two orthogonal directions using a total of four SMA actuator wires each connected at its ends between the movable element and the support structure and extending perpendicular to the primary axis. None of the SMA actuator wires are collinear, but the SMA actuator wires have an arrangement in which they are capable of being selectively driven to move the movable element relative to the support structure to any position in said range of movement without applying any net torque to the movable element in the plane of the two orthogonal directions around the primary axis. Accordingly, it is possible to drive movement whilst balancing the forces to limit torque around the primary axis.

    Abstract translation: SMA致动装置使用总共四个SMA致动器线在两个正交方向上相对于支撑结构移动可移动元件，每个SMA致动器线在其可移动元件和支撑结构之间的端部处连接并且垂直于主轴线延伸。 没有SMA致动器线是共线的，但是SMA致动器线具有这样的布置，其中它们能够被选择性地驱动以将可移动元件相对于支撑结构移动到所述移动范围内的任何位置，而不施加任何净扭矩 围绕主轴的两个正交方向的平面中的可移动元件。 因此，可以在平衡力的同时驱动运动以限制主轴周围的转矩。

    CONTROL OF AN SMA ACTUATION ARRANGEMENT
    8.
    发明申请
    CONTROL OF AN SMA ACTUATION ARRANGEMENT 审中-公开

    公开(公告)号：US20180348593A1

    公开(公告)日：2018-12-06

    申请号：US15780742

    申请日：2016-12-08

    Applicant: CAMBRIDGE MECHATRONICS LIMITED

    Inventor： Andrew Benjamin David Brown

    IPC: G03B3/10 ,  G03B5/02

    Abstract: Resistance feedback control of drive signals for plural SMA actuator wires in an SMA actuation arrangement is performed. Target resistance values are set representing a desired position of a movable element with respect to the support structure. Measures of resistance of each SMA actuator wire are detected. Errors are derived from the target resistance values and the detected measures of resistance, the errors being adjusted by offsets. The powers of the drive signals supplied to SMA actuator wires are controlled. in accordance with the adjusted errors. The offsets have values selected to adjust the actual position of the movable element to match the desired positions represented by the target resistance values.

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