A scanner comprising: a scanner body; a first actuator coupled to the scanner body and oriented along a first axis (x); a second actuator coupled to the scanner body and oriented along a second axis (y) orthogonal to the first axis (x); a center member coupled to each of the actuators (64, 68) at a position spaced from the point at which the actuator is coupled to the scanner body; a first coupling between the first actuator and the center member for constraining motion of the center member relative to the first actuator along the first axis (x) while permitting translation of the center member relative to the first actuator along the second axis (y); and a second coupling between the second actuator and the center member for constraining motion of the center member relative to the second actuator along the second axis (y) while permitting translation of the center member relative to the second actuator along the first axis (x); characterized in that: the first and second couplings (72, 76) comprise respective first and second sets of blade springs; the first set of blade springs coupled to the first actuator are parallel to the first axis (x) and perpendicular to the second axis (y) such that the first set of blade springs provide rigid coupling along the first axis (x) but are free to bend as the center member is moved along the second axis (y) by the second actuator; and the second set of blade springs coupled to the second actuator are parallel to the second axis (y) and perpendicular to the first axis (x) such that the second set of blade springs provide rigid coupling along the second axis (y) but are free to bend as the center member is moved along the first axis (x) by the first actuator. a scanner body; a first actuator coupled to the scanner body and oriented along a first axis (x); a second actuator coupled to the scanner body and oriented along a second axis (y) orthogonal to the first axis (x); a center member coupled to each of the actuators (64, 68) at a position spaced from the point at which the actuator is coupled to the scanner body; a first coupling between the first actuator and the center member for constraining motion of the center member relative to the first actuator along the first axis (x) while permitting translation of the center member relative to the first actuator along the second axis (y); and a second coupling between the second actuator and the center member for constraining motion of the center member relative to the second actuator along the second axis (y) while permitting translation of the center member relative to the second actuator along the first axis (x); characterized in that: the first and second couplings (72, 76) comprise respective first and second sets of blade springs; the first set of blade springs coupled to the first actuator are parallel to the first axis (x) and perpendicular to the second axis (y) such that the first set of blade springs provide rigid coupling along the first axis (x) but are free to bend as the center member is moved along the second axis (y) by the second actuator; and the second set of blade springs coupled to the second actuator are parallel to the second axis (y) and perpendicular to the first axis (x) such that the second set of blade springs provide rigid coupling along the second axis (y) but are free to bend as the center member is moved along the first axis (x) by the first actuator. the first and second couplings (72, 76) comprise respective first and second sets of blade springs; the first set of blade springs coupled to the first actuator are parallel to the first axis (x) and perpendicular to the second axis (y) such that the first set of blade springs provide rigid coupling along the first axis (x) but are free to bend as the center member is moved along the second axis (y) by the second actuator; and the second set of blade springs coupled to the second actuator are parallel to the second axis (y) and perpendicular to the first axis (x) such that the second set of blade springs provide rigid coupling along the second axis (y) but are free to bend as the center member is moved along the first axis (x) by the first actuator.