MEMS Thermal Actuator Locking Mechanism
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Solution Overview
Problem
Conventional methods for locking components in microelectromechanical systems (MEMS) face issues with positional shifts due to stress in epoxy adhesives and require precise alignment with passive locks and rack-and-tooth mechanisms, which can be unreliable.
Innovation Solution
A MEMS device incorporating a positioning mechanism with arm structures and thermal actuators, along with a locking mechanism featuring pairs of locking elements with tooth structures that engage and disengage to securely position and lock arm structures, providing a strong and stable locking force without the need for continuous power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If epoxy adhesive is used to fix components in position, then components can be held in place during assembly, but positional shifts occur after curing due to stress inside the solid epoxy
Solution Approach 1:
The patent replaces the chemical bonding mechanism of epoxy adhesive with a mechanical locking system consisting of locking elements and tooth structures. The locking elements engage with corresponding tooth structures on arm structures to provide stress-free mechanical retention, eliminating the stress-induced positional shifts that occur with epoxy curing.
Solution Approach 2:
The locking mechanism is divided into discrete locking elements and arm structures with tooth structures. This segmentation allows for precise mechanical engagement at specific locations, enabling accurate component positioning without the need for continuous adhesive bonding that causes stress.
2Reliability
If passive locks and rack-and-tooth mechanisms are used to keep components in position, then locking functionality is achieved, but precise alignment is required to perform the locking functionality
Solution Approach 1:
The locking elements are designed to be movable rather than fixed, allowing them to dynamically engage with the tooth structures on arm structures. This dynamic engagement provides a tolerance range for alignment, reducing the need for extremely precise manufacturing while maintaining reliable locking functionality.
Solution Approach 2:
The patent modifies the geometric parameters of the tooth structures and locking elements to create an engagement mechanism that is less sensitive to alignment variations. By optimizing the tooth profile and engagement geometry, the system achieves reliable locking with relaxed alignment requirements compared to conventional rack-and-tooth mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures precise and stable positioning of components with high alignment accuracy and increased friction force, allowing for improved optical coupling efficiency and mechanical locking without power maintenance.
Implementation Method 1
a first actuator disposed adjacent to the second surface of the first arm structure facing away from the second arm structure; and a second actuator disposed adjacent to the second surface of the second arm structure
Data Source
AI summary
A microelectromechanical system (MEMS) device, method of operating the MEMS device, and a method of forming the MEMS device are provided. The MEMS device includes a positioning mechanism and a locking mechanism. The positioning mechanism includes a first arm structure having a first surface and a second surface; a second arm structure having a first surface and a second surface; wherein the first surface of the first arm structure faces the first surface of the second arm structure. The positioning mechanism also includes a first actuator disposed adjacent to the second surface of the first arm structure facing away from the second arm structure; and a second actuator disposed adjacent to the second surface of the second arm structure facing away from the first arm structure. The locking mechanism includes a first pair of locking elements arranged such that each locking element is disposed at two opposite side surfaces of the first arm structure between the first and second surfaces of the first arm structure; and a second pair of locking elements arranged such that each locking element is disposed at two opposite side surfaces of the second arm structure between the first and second surfaces of the second arm structure. The first and second pairs of locking elements are configured to engage with and disengage from the first and second arm structures respectively.