Force detection device, force detection method, and clothes processing device
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Solution Overview
Problem
Existing force detection methods face challenges in achieving high accuracy while maintaining cost and size efficiency, particularly in applications like clothes processing devices where precise force measurement is crucial.
Innovation Solution
A force detection device utilizing an elastic body with multiple portions of different rigidities to bias a movable unit, allowing for accurate displacement detection, which includes a sensor to measure the displacement and calculate the applied force across varying ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single rigid elastic body is used for force detection, then the device structure is simple, but the force detection accuracy is insufficient
Solution Approach 1:
The elastic body is divided into multiple portions (first elastic portion, second elastic portion, third elastic portion) with different rigidities. Each portion has a distinct spring constant (k1, k2, k3) where k1 < k2 < k3, allowing the system to detect forces across different magnitude ranges with appropriate precision for each range.
Solution Approach 2:
Different portions of the elastic body are assigned different local properties (rigidities) to match different detection requirements. The first elastic portion has lower rigidity for detecting smaller forces, while the third elastic portion has higher rigidity for detecting larger forces, optimizing detection accuracy for each local region's function.
2Measurement precision
If multiple elastic bodies with different rigidities are used to improve detection range, then the detection accuracy improves, but the device size and cost increase
Solution Approach 1:
Multiple elastic portions with different rigidities are merged into a single integrated elastic body structure. This allows the system to achieve multi-range detection capability without requiring separate elastic bodies, thereby reducing overall device size and complexity while maintaining high detection accuracy across different force magnitudes.
Solution Approach 2:
The single elastic body serves multiple functions by incorporating portions with different rigidities. It can detect both small forces (using the first elastic portion) and large forces (using the third elastic portion), making the device universally applicable across a wide force detection range without requiring multiple specialized components.
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 approach enhances force detection accuracy while minimizing cost and size increases, enabling effective force measurement in clothes processing devices and other applications.
Implementation Method 1
an elastic body that biases a movable unit in a direction in which displacement is suppressed when a force is applied to the movable unit to displace the movable unit
Data Source
AI summary
Force detection device 40 includes leaf spring 47 that biases a movable unit in a direction in which displacement is suppressed when a force is applied to the movable unit to displace the movable unit, and displacement sensor 48 that detects the displacement of the movable unit. Leaf spring 47 includes a plurality of portions having different rigidities.