Abstract
A new type of micro-joint based on an elastic design concept is proposed for large rotational movement. The proposed new 3D micro-joint was designed based on a cross-spring that has precise and reliable motion. However, the cross-spring has a limitation in the range of rotational angle. To improve the range of rotational movement, the proposed 3D micro-joint was modified with a helical structure. By adding the helical structure, the modified rotational joint can achieve large rotational movement The micro-joint was fabricated by the two-photon stereolithography process (TPS process). The micro-joint was manipulated by optical trapping force. With the same optical trapping force, the advantage of proposed cross-spring on the large rotational movement was evaluated. And the precise movement of the proposed micro-joint was evaluated by calculating the RMS error. It has been shown that the proposed 3D micro-joint has precise and reliable motion for large rotational angle.
Highlights
The mechanical actuators used in machinery, electronics, and biotechnology are composed of various types of joints
By applying optical trapping force, we demonstrate that the proposed joint has precise and reliable motion with a large range of rotational movement
The proposed micro rotational joint can be fabricated by using the two-photon stereolithography process
Summary
The mechanical actuators used in machinery, electronics, and biotechnology are composed of various types of joints. The moving part can be rotated only with the elastic deformation of the two crossed thin plates This makes it possible to realize reliable rotational movement with minimal motion error. The rotational joint based on a cross-spring structure can achieve highly precise rotational movement within limited small angle of rotation, for example, less than ten degrees. To obtain a large angle of rotational movement covering tens of degrees for various applications of micro devices, a new concept of a micro-joint combining a crossspring with a helical structure is proposed. When the helical structure is added, the elastic deformation for rotational movement can be increased to a great extent This allows greater elastic deformation and a larger rotational angle compared to the conventional cross-spring. By applying optical trapping force, we demonstrate that the proposed joint has precise and reliable motion with a large range of rotational movement
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