Actuator inside of motion control
View Patent ↗A device can comprise an outer frame, a platform, and a motion control mechanism. The motion control mechanism can be adapted to permit movement of the platform in a desired direction with respect to the outer frame and inhibit rotation of the platform with respect to the outer frame. An actuator can be contained at least partially within the motion control mechanism.
1. A device, comprising:
a generally planar outer frame;
a platform;
a motion control mechanism adapted to permit movement of the platform in a plurality of directions relative to the outer frame; and
an actuator contained at least partially within the motion control mechanism and operable to move the platform in a plurality of directions relative to the outer frame, including with translational movement in a direction substantially perpendicular to a plane defined by the outer frame, wherein the actuator comprises a movable frame, and wherein the motion control mechanism comprises a plurality of flexures configured to cooperate to provide a lateral stiffness and a rotational stiffness between the outer frame and the moveable frame and wherein the lateral stiffness is comparatively higher than the rotational stiffness.
2. The device as recited in claim 1 , wherein the actuator is contained substantially entirely within the motion control mechanism such that increasing a size of the actuator results in increasing a size of the motion control mechanism.
3. The device as recited in claim 1 , wherein the actuator and the motion control mechanism have a part in common such that increasing a size of the actuator results in increasing a size of the motion control mechanism.
4. The device as recited in claim 3 ,
wherein the actuator and the motion control mechanism have the movable frame in common.
5. The device as recited in claim 1 , wherein:
the actuator comprises a fixed frame; and
the plurality of flexures of the motion control mechanism comprise at least one torsional flexure and at least one hinge flexure cooperating to provide the lateral stiffness between the outer frame and the movable frame and cooperating to provide the rotational stiffness between the outer frame and the movable frame.
6. The device as recited in claim 5 , wherein the at least one torsional flexure provides the lateral stiffness.
7. The device as recited in claim 5 , wherein the at least one hinge flexure provides the rotational stiffness.
8. The device as recited in claim 5 , wherein the at least one hinge flexure is X-shaped.
9. The device as recited in claim 5 , wherein the motion control mechanism comprises a cantilever flexure interconnecting the movable frame and the platform.
10. The device as recited in claim 9 , wherein the cantilever flexure is adapted to bend in a plurality of different directions.
11. The device as recited in claim 10 , wherein the cantilever flexure is adapted to bend in one direction to accommodate a varying angle between the movable frame of the actuator and the platform and bend in a different direction to accommodate a varying distance between the movable frame of the actuator and the platform.
12. The device as recited in claim 1 , wherein the actuator comprises a rotational comb actuator.
13. The device as recited in claim 1 , wherein the platform is adapted to attach to an optical element.
14. An electronic device comprising the device of claim 1 .
15. The device as recited in claim 1 , further comprising:
an optical element attached to the platform for conjoint movement therewith.
16. A method, comprising:
forming a generally planar outer frame;
forming a platform;
forming a motion control mechanism adapted to permit movement of the platform in a plurality of directions relative to the outer frame; and
forming an actuator at least partially within the motion control mechanism, the actuator being operable move the platform in a plurality of directions relative to the outer frame, including with translational movement in a direction substantially perpendicular to a plane defined by the outer frame, wherein the actuator comprises a movable frame, and wherein the motion control mechanism comprises a plurality of flexures configured to cooperate to provide a lateral stiffness and a rotational stiffness between the outer frame and the moveable frame and wherein the lateral stiffness is comparatively higher than the rotational stiffness.
17. The method as recited in claim 16 , wherein the outer frame, the platform, the motion control mechanism, and the actuator are of monolithic construction.
18. The method as recited in claim 16 , wherein the outer frame, the platform, the motion control mechanism, and the actuator are formed by a MEMS process.
19. A method, comprising:
permitting movement of a platform in a plurality of directions relative to a generally planar outer frame;
moving the platform with translational movement in a direction substantially perpendicular to a plane defined by the outer frame with an actuator contained at least partially within a motion control mechanism;
bending a cantilever flexure in one direction to accommodate a varying angle between a movable frame of an actuator and the platform; and
bending the cantilever flexure in a different direction to accommodate a varying distance between the movable frame of the actuator and the platform.
20. The method as recited in claim 19 , wherein the moving comprises moving a lens that is coupled to the platform along an optical axis of the lens.
21. The method as recited in claim 20 , wherein the lens comprises a lens of a camera.
22. The method as recited in claim 21 , wherein the camera comprises a miniature camera disposed in an electronic device.