Shape memory alloy actuation apparatus
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United States of America Patent
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Dec 13, 2016
Grant Date -
May 21, 2015
app pub date -
May 21, 2013
filing date -
May 25, 2012
priority date (Note) -
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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.
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