Probe Measuring Force Adjuster Using Plate Springs and Magnets
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Solution Overview
Problem
Current probe measuring technologies face challenges in achieving high accuracy due to fluctuations in measuring force, which can lead to thermal deformation and electrical noise, and require complex control systems that increase costs and reduce measurement precision.
Innovation Solution
A probe measuring force adjuster is designed with a simple configuration using plate-like elastic members and permanent magnets to adjust the measuring force by combining spring force and magnetic force, preventing heat and noise generation, and allowing for precise control of the force acting on the probe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the spring constant in the bending direction is reduced to lower the measuring force, then the measuring force becomes smaller, but the rigidity in other directions such as twisting or curving also becomes lower, leading to greater deformation and deterioration in measurement accuracy
Solution Approach 1:
The elastic hinge is designed with non-uniform thickness distribution, being thicker in regions requiring high rigidity (twisting/curving directions) and thinner in the bending direction. This local variation in structural quality allows the hinge to exhibit different stiffness characteristics in different directions, achieving low measuring force while maintaining high rigidity in non-measuring directions.
Solution Approach 2:
The elastic hinge utilizes composite structural design combining materials and geometries that provide anisotropic mechanical properties. The composite structure enables the hinge to have low spring constant in the bending direction for force reduction while maintaining high rigidity in other directions to prevent unwanted deformations.
2Measurement precision
If control mechanisms are added to stabilize and adjust the measuring force, then the measuring force can be controlled, but heat is generated causing thermal deformation, electrical noise is produced, and costs increase
Solution Approach 1:
The patent replaces active control systems (electrical actuators, sensors, and control algorithms) with a passive mechanical solution. The elastic hinge's restoring force is adjusted through its geometric design and material properties, eliminating the need for electrical control components that generate heat and noise.
Solution Approach 2:
The elastic hinge automatically provides the necessary restoring force based on its inherent elastic properties and geometric configuration. The system self-regulates the measuring force through its structural design without requiring external control inputs, power supply, or active intervention.
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 enables precise adjustment of the measuring force, enhancing measurement accuracy while avoiding the drawbacks of heat and noise generation, and simplifying the control system, thereby improving the reliability and cost-effectiveness of the measurement process.
Implementation Method 1
a first plate-like elastic member having a first end fixated to a first end portion of the second member, a second end fixated to the first member
Implementation Method 2
a first magnetic member provided to the first end portion of the second member; a second magnetic member provided to the second end portion of the second member; a third magnetic member provided to the first member and arranged separate from the first magnetic member so as to generate a magnetic force in the first direction between the first magnetic member and the third magnetic member
Data Source
AI summary
A stylus support portion moveable in an X direction is arranged separate from a fixed portion. A plate spring has a first end fixated to an end portion of the stylus support portion in an X (+) direction, a second end fixated to the fixed portion, and a principal surface facing the X direction. A plate spring has a first end fixated to an end portion of the stylus support portion in an X (−) direction, a second end fixated to the fixed portion, and a principal surface facing the X direction. A first permanent magnet is provided on the end portion of the stylus support portion in the X (+) direction. A second permanent magnet is provided on the end portion of the stylus support portion in the X (−) direction. A third permanent magnet is provided to the fixed portion so that a magnetic force in the X direction acts on an area between the first permanent magnet and the third permanent magnet. A fourth permanent magnet is provided to the fixed portion so that the magnetic force in the X direction acts on an area between the second permanent magnet and the fourth permanent magnet.