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An optical element positioner in which a carriage holding the optical element is driven in response to electrical control signals to selected locations along an optical path by a moving-iron, limited-rotation actuator, with the reflected load inertia substantially matched to the actuator rotor and c

An optical element positioner in which a carriage holding the optical element is driven in response to electrical control signals to selected locations along an optical path by a moving-iron, limited-rotation actuator, with the reflected load inertia substantially matched to the actuator rotor and crank arm inertia.

대표청구항 ▼

Apparatus for positioning an optical element at selected locations along an optical axis, comprising a carriage on which said optical element is mounted, support and guide means for holding said carriage, and confining it to substantially linear motion along said axis, a moving-iron, limited-rotatio

Apparatus for positioning an optical element at selected locations along an optical axis, comprising a carriage on which said optical element is mounted, support and guide means for holding said carriage, and confining it to substantially linear motion along said axis, a moving-iron, limited-rotation actuator having a rotor and a rotor shaft rotatable over a range of angular excursions within a maximum operational angular excursion defined by the configurations of the stator and rotor pole faces of said actuator, a crank arm connecting the shaft of said actuator to said carriage and arranged to drive said carriage in linear motion when the shaft of said actuator rotates, the length of said crank arm being arranged with respect to said maximum operational angular excursion of said shaft to substantially match the inertia of said crank arm and the rotor of said actuator to the reflected inertia of said carriage, and control means adapted to apply electrical signals to said actuator to controllably vary the rotary position of said rotor of said moving-iron, limited-rotation actuator and thereby the position of said optical element along said axis.