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An actuator device includes a motor and a reduction device operatively coupled to the motor and oriented about a central axis, the reduction device configured to modify an input angle of rotation provided by the motor to an output angle of rotation. Further included is a rotary flexure mechanism tha

An actuator device includes a motor and a reduction device operatively coupled to the motor and oriented about a central axis, the reduction device configured to modify an input angle of rotation provided by the motor to an output angle of rotation. Further included is a rotary flexure mechanism that includes a rotary flexure operatively coupled to an output portion of the reduction device. The rotary flexure mechanism also includes a plurality of flexure blades coupled to the rotary flexure, each of the flexure blades angularly oriented from the central axis. The rotary flexure mechanism further includes a diaphragm flexure pair operatively coupled to the flexure blades, wherein the diaphragm flexure comprises a rotational and in-plane stiffness greater than an axial stiffness resulting in the rotary flexure mechanism being configured to convert a rotational input to an axial translation.

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1. An actuator device comprising: a motor;a reduction device operatively coupled to the motor and oriented about a central axis, the reduction device configured to modify an input angle of rotation provided by the motor to an output angle of rotation; anda rotary flexure mechanism comprising: a rota

1. An actuator device comprising: a motor;a reduction device operatively coupled to the motor and oriented about a central axis, the reduction device configured to modify an input angle of rotation provided by the motor to an output angle of rotation; anda rotary flexure mechanism comprising: a rotary flexure operatively coupled to an output portion of the reduction device;a plurality of flexure blades coupled to the rotary flexure, each of the plurality of flexure blades angularly oriented from the central axis;a diaphragm flexure pair operatively coupled to the plurality of flexure blades, wherein the diaphragm flexure pair comprises a rotational and in-plane stiffness greater than an axial stiffness, the diaphragm flexure pair configured to convert a rotational input to an axial translation, wherein the plurality of blades is operatively coupled to an output plate that is mechanically fastened to the diaphragm flexure pair; anda diaphragm connector extending between, and operatively coupled to the output plate and the diaphragm flexure pair. 2. The actuator device of claim 1, wherein the rotary flexure comprises an axial stiffness greater than a rotational stiffness. 3. The actuator device of claim 2, wherein the axial stiffness of the rotary flexure is greater than about 140,000 lb/in and the rotational stiffness of the rotary flexure is less than about 5 lb*in/degree. 4. The actuator device of claim 1, wherein the reduction device comprises a first harmonic drive and a second harmonic drive. 5. The actuator device of claim 4, wherein the first harmonic drive comprises a reduction ratio ranging from about 50:1 to about 100:1 and the second harmonic drive comprises a reduction ratio ranging from about 50:1 to about 100:1. 6. The actuator device of claim 1, wherein the rotary flexure comprises at least one stop configured to limit rotational movement of the rotary flexure. 7. The actuator device of claim 1, wherein the diaphragm flexure pair is configured to move in a first axial direction upon rotation of the rotary flexure in a first rotational direction and the diaphragm flexure pair is configured to move in a second axial direction upon rotation of the rotary flexure in a second rotational direction. 8. The actuator device of claim 1, wherein the motor comprises a stepper motor. 9. The actuator device of claim 1, wherein the actuator device is disposed in an optical telescope and the diaphragm flexure pair is operatively coupled to a mirror of the optical telescope to control axial movement of the mirror.