Bending Spring Meander Curvature for Micromechanical Sensor Stress Reduction
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Solution Overview
Problem
Micromechanical sensors face damage and reduced accuracy due to high peak stresses in bending spring devices during extreme deflections, leading to potential breakage and hindered sensor functionality.
Innovation Solution
The design of the bending spring device incorporates a meander with a radius of curvature having a midpoint inside the meander, along with additional radii of curvature outside the meander, and rounded transitions to adjacent components, distributing stress and reducing peak loads, thereby enhancing elasticity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a meandering bending spring design is used to achieve high elasticity, then the sensor mass can move more freely in the detection direction, but shock effects cause extreme bending stresses that may damage the bending spring device
Solution Approach 1:
The patent applies curvature principles by designing the meander with specific radius of curvature characteristics. The meander includes at least one circle of curvature whose midpoint is inside the meander, creating a convex curvature design. This curved geometry distributes bending stresses more evenly throughout the spring structure, reducing peak stresses at sharp corners while maintaining the elasticity needed for sensor mass movement.
Solution Approach 2:
The patent changes geometric parameters of the bending spring, specifically the radius of curvature of the meander sections. By optimizing the radius of curvature to be sufficiently large (with the circle midpoint inside the meander), the design achieves a balance between elasticity and stress distribution, preventing damage during shock events while maintaining operational flexibility.
2Reliability
If the bending spring has a meander with midpoint of circle of curvature inside the meander, then stress peaks are reduced, but the design complexity increases
Solution Approach 1:
The patent uses curved meander designs with specific geometric properties (circles of curvature with midpoints inside the meander) to reduce stress peaks. This curvature-based approach naturally distributes stresses without requiring additional components or complex mechanisms, achieving improved reliability through elegant geometric design rather than structural complexity.
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 design effectively reduces stress peaks, prevents damage to the bending spring device, and improves the accuracy of acceleration and rotational motion detection in micromechanical sensors by ensuring uniform deflection and distributing stress over a larger area.
Implementation Method 1
The bending spring device has a spring bar and a meander, provided thereon, having a circle of curvature whose midpoint is inside the meander
Data Source
AI summary
A micromechanical sensor comprising a substrate (5) and at least one mass (6) which is situated on the substrate (5) and which moves relative to the substrate (5) is used to detect motions of the sensor due to an acceleration force and/or Coriolis force which occur(s). The mass (6) and the substrate (5) and/or two masses (5, 7) which move toward one another are connected by at least one bending spring device (6). The bending spring device (6) has a spring bar (9) and a meander (10), provided thereon, having a circle of curvature (K1; K6; K8; K9; K11) whose midpoint (MP1; MP6; MP8; MP9; MP11) and radius of curvature (r1; r6; r8; r9; r11) are inside the meander (10). For reducing stresses that occur, in addition to the radius of curvature (r1; r6; r8; r9; r11) having the inner midpoint (MP1; MP6; MP8; MP9; MP11), the meander (10) has at least one further radius of curvature (r2; r3; r4; r5; r7; r10) having a midpoint (MP2; MP3; MP4; MP5; MP7; MP10) outside the meander (10). The at least one further radius of curvature (r2; r3; r4; r5; r7; r10) is situated between the meander (10) and the spring bar (9).