Linear Displacement Transmission Structure for Micro Movement Devices
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Solution Overview
Problem
Existing three-dimensional micro movement devices face challenges with resonance frequency reduction and scan speed limitations due to the weight and complexity of flexure structures, leading to increased manufacturing costs and interference between axes.
Innovation Solution
A linear structure for displacement transmission with negligible spring constants in perpendicular directions allows for smooth movement in the desired direction, minimizing complexity and interference, and is integrated into one-dimensional and three-dimensional micro movement devices to enhance dynamic characteristics and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a scanner is installed by stacking at least two or more scanners to implement three-dimensional micro movement, then the three-dimensional movement capability is achieved, but the resonance frequency is reduced due to the weight of stacked scanners which deteriorates dynamic characteristics and lowers scan speed limit
Solution Approach 1:
The patent divides the three-dimensional movement function into three independent one-dimensional scanners arranged orthogonally, each responsible for movement in one direction. This segmentation allows each scanner to operate independently with its own driving part, eliminating the need to stack scanners vertically and thus avoiding the weight penalty that reduces resonance frequency and scan speed.
Solution Approach 2:
The patent transitions from a vertical stacking arrangement to a horizontal orthogonal arrangement of three one-dimensional scanners. By utilizing three spatial dimensions (X, Y, Z axes) rather than stacking in one dimension, the system achieves three-dimensional movement capability while maintaining low weight and high scan speed for each individual scanner.
2Reliability
If a flexure structure is used to guide motion in a predetermined direction without friction, then stable motion is achieved, but the structure becomes complex requiring precise machining which increases manufacturing cost and time
Solution Approach 1:
The patent replaces the complex flexure structure with a linear structure for displacement transmission consisting of a displacement transmission plate and multiple displacement transmission rods. This substitution maintains the guidance function without requiring precise machining of complex flexure geometries, thereby reducing manufacturing complexity and cost while preserving motion stability.
Solution Approach 2:
The patent changes the structural parameters from complex flexure geometries to simple linear rods and plates with controlled spring constants. The displacement transmission rods are designed with specific length and cross-sectional area ratios to achieve the desired guidance characteristics, simplifying the manufacturing process while maintaining reliable motion control.
3Manufacturing precision
If the linear structure has high rigidity in the scan direction to transmit displacement accurately, then displacement transmission precision is improved, but the structure becomes resistant to movement in perpendicular directions which may cause interference
Solution Approach 1:
The patent applies different mechanical properties to different directions of the displacement transmission rods. The rods are designed with high rigidity (large spring constant) in the scan direction to ensure accurate displacement transmission, while having low rigidity (negligibly small spring constant) in perpendicular directions to allow easy deformation and prevent interference with other axes. This directional differentiation of mechanical properties resolves the contradiction between precision and interference.
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
The solution results in a smaller, lighter, and more cost-effective micro movement device with improved dynamic characteristics, reducing resonance frequency issues and enabling faster scan speeds without inter-axis interference, suitable for precise movements in scanning microscopes and micro machining devices.
Implementation Method 1
a spring constant in a second direction and a third direction which are perpendicular to a first direction is formed to be negligibly smaller than the spring constant in the first direction such that the linear structure for displacement transmission is immediately bent in the second direction or the third direction without resistance when force in the second direction or the third direction is applied and transmits a displacement in the first direction
Data Source
AI summary
Provided is a linear structure for displacement transmission that can be bent in a second direction or a third direction when force in the second direction or the third direction is applied and can transmit a displacement in a first direction from an end of one side to an end of the other side when force in the first direction is applied. The linear structure includes a displacement transmission plate and a plurality of displacement transmission rods disposed radially on the displacement transmission plate to transmit the displacement in the first direction from the end of one side to the end of the other side.