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Shape memory alloy actuation apparatus

An actuating device and actuator technology, applied in projection devices, printing devices, machines/engines, etc., can solve problems such as reducing image quality

Active Publication Date: 2015-02-04
CAMBRIDGE MECHATRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This tilt is controlled to stabilize the image formed by the camera lens elements on the image sensor against vibrations typically caused by user hand movement that degrade the quality of the image captured by the image sensor
WO-2011 / 104518 discloses an SMA actuation device where SMA actuator wires are used to provide OIS in a camera by driving the tilt of the camera unit, but with an additional degree of freedom

Method used

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  • Shape memory alloy actuation apparatus
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Examples

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Embodiment Construction

[0026] figure 1 A camera device 1 is shown as an example of an SMA actuating device according to the invention, figure 1 is a cross-sectional view taken along the optical axis O, which is the nominal principal axis. In order to clearly describe the main parts of the camera device 1, the SMA actuator wires are not in figure 1 shown in , but then refer to Figure 3-5 described. The camera arrangement 1 is to be incorporated into a portable electronic device like a mobile phone, media player or portable digital assistant. Miniaturization is therefore an important design criterion.

[0027] The camera device 1 comprises lens elements 2 supported on a support structure 4 by means of a suspension system 7 in such a manner that, as described in detail below, the lens elements 2 are Two orthogonal directions of O move relative to the support structure 4 . Thus, the lens element 2 is a movable element.

[0028] The support structure 4 is a camera mount supporting the image senso...

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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.

Description

technical field [0001] The present invention involves the use of SMA (Shape Memory Alloy) actuator wires to provide position control of a movable element supported on a support structure. Background technique [0002] There are various types of devices in which it is desired to provide positional control of a movable element. SMA actuator wires are advantageous as actuators in these devices, especially due to their high energy density, which means that the SMA actuator required to exert a given force has a relatively small size. [0003] One type of device in which known SMA actuator wires are used as actuators is a camera, especially a miniature camera. Some examples are as follows. WO-2007 / 113478 discloses an SMA actuation device in which SMA actuator wires are used to drive a camera lens element along an optical axis, for example in order to focus an image formed by the camera lens element onto an image sensor. WO-2010 / 029316 and WO-2010 / 089529 each disclose an SMA act...

Claims

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Application Information

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IPC IPC(8): G02B27/64H04N5/232F03G7/06
CPCG03B2205/0015G03B2205/0076G02B27/646F03G7/065H04N5/23287G03B5/00H04N23/687F03G7/06143
Inventor 罗宾·爱丁顿詹姆斯·豪沃思安德鲁·本杰明·大卫·布朗
Owner CAMBRIDGE MECHATRONICS
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