Force Detection Mesa Gauge Sensitivity via Segmented Transmission
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Solution Overview
Problem
Existing force detection apparatuses utilizing the piezoresistance effect face challenges in improving sensor sensitivity, particularly when compacted, leading to reduced compressive stress on mesa gauges and decreased sensitivity.
Innovation Solution
The design includes a substrate with high-sensitive and low-sensitive mesa gauges and a force transmission block that contacts only the high-sensitive mesa gauge, avoiding contact with the mesa lead to enhance force transmission and increase compressive stress on the high-sensitive gauge, while also incorporating a sealing portion and support to create a sealed space that leverages the force transmission block's bend for increased sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the force detection apparatus is compacted, then the device size is reduced, but the pressure receiving area of the force transmission block decreases, leading to reduced compressive stress on the mesa gauge and decreased sensor sensitivity
Solution Approach 1:
The force transmission block is divided into distinct functional regions: a pressure receiving portion with a specific area for receiving force, a transmission path for conveying the force, and a bending portion that amplifies the stress. This segmentation allows each region to be optimized independently, enabling compact overall dimensions while maintaining adequate pressure receiving area and stress concentration at the mesa gauge location.
Solution Approach 2:
The force transmission block utilizes three-dimensional positioning and dimensional transitions, particularly through the bending portion that creates vertical displacement and leverage. By transitioning from a simple planar structure to a multi-dimensional configuration with controlled bending, the apparatus achieves force amplification and stress concentration without increasing the overall footprint, thus maintaining sensor sensitivity in a compact form factor.
2Stability of the object's composition
If the force transmission block contacts the mesa lead, then the structural support is improved, but the force transmission to the high-sensitive mesa gauge is reduced, decreasing compressive stress and sensor sensitivity
Solution Approach 1:
The mesa lead is extracted from the force transmission path by positioning it outside the contact area of the force transmission block. The force transmission block is designed to contact only the high-sensitive mesa gauge and low-sensitive mesa gauge, deliberately excluding the mesa lead from the force transmission path. This separation ensures that measurement forces are not contaminated by contact with the lead structure.
Solution Approach 2:
Different regions of the substrate are assigned different functional qualities: the mesa gauge regions are designed for force reception and stress concentration, while the mesa lead region is designed for electrical connection only. The force transmission block exhibits local quality by having specific contact areas optimized for force transmission to the gauges while avoiding contact with the lead, thus maintaining both structural integrity and measurement accuracy.
3Measurement precision
If the pressure receiving area of the force transmission block is increased, then the compressive stress on the mesa gauge is improved, but the device size increases
Solution Approach 1:
The force transmission block incorporates a bending portion that introduces dynamic mechanical advantage to the force transmission system. As force is applied to the pressure receiving portion, the bending portion flexes and amplifies the stress through leverage, concentrating compressive stress on the mesa gauge without requiring a proportionally large pressure receiving area. This dynamic mechanical amplification allows adequate stress generation in a compact configuration.
Solution Approach 2:
The apparatus utilizes parameter changes in the mechanical properties of the force transmission block, particularly the bending portion's flexibility and elastic modulus. By optimizing these parameters, the block can generate sufficient compressive stress on the mesa gauge through controlled deformation, achieving effective force transmission without requiring excessive dimensions for the pressure receiving area.
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 configuration improves sensor sensitivity and linearity by efficiently transmitting force to the high-sensitive mesa gauge and utilizing a leverage mechanism within the sealed space to amplify compressive stress, thereby enhancing the detection apparatus's performance.
Implementation Method 1
When the force transmission block presses the high-sensitive mesa gauge, compressive stress applied to the high-sensitive mesa gauge increases. In this case, electric resistance of the high-sensitive mesa gauge changes by a piezoresistance effect.
Data Source
AI summary
A force detection apparatus includes a substrate and a force transmission block. The substrate includes: a high-sensitive mesa gauge that is provided on a main surface, extends in a first direction to produce a relatively large change of an electric resistance in accordance with compressive stress, and includes a top surface; a low-sensitive mesa gauge that is provided on the main surface, extends in a second direction to produce a relatively small change of an electric resistance, and includes a top surface; and a mesa lead that is provided on the main surface, extends in a third direction, and includes a top surface. The force transmission block contacts the top surface of the high-sensitive mesa gauge and the top surface of the low-sensitive mesa gauge, and is non-contact with at least a part of the top surface of the mesa lead.