Single-Sensor Pressing Force Input for Bidirectional Detection
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Solution Overview
Problem
Existing pressing force input devices require multiple sensors to distinctly detect operations in different directions, leading to increased size and cost.
Innovation Solution
A pressing force input device utilizing a single pressing force sensor with an actuator and detection portion, where the operation body is oscillatably supported via a fulcrum and pressed by an elastic member, allowing detection outputs to change differently across a neutral point when operated in various directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pressing force sensors are used to distinctly detect operations of different directions, then the detection capability is improved, but the device size and cost increase
Solution Approach 1:
The single pressing force sensor is segmented into multiple detection portions, each responsible for detecting forces in specific directions. The detection output is divided into multiple components (first detection output and second detection output) that correspond to different directional forces, allowing a single sensor to perform the function of multiple sensors through internal segmentation of the detection function.
Solution Approach 2:
The single pressing force sensor is designed to perform multiple detection functions simultaneously. It can detect forces in different directions (first direction and second direction) and generate multiple detection outputs, making one sensor universal for detecting operations in multiple directions that would traditionally require separate sensors.
2Measurement precision
If multiple pressing force sensors are used to distinctly detect operations of different directions, then the detection capability is improved, but the device cost increases
Solution Approach 1:
Multiple detection functions are merged into a single pressing force sensor. The sensor integrates multiple detection portions and generates multiple detection outputs simultaneously, combining the functions of what would traditionally require multiple separate sensors into one unified component, thereby reducing overall device cost.
Solution Approach 2:
The pressing force sensor is designed as a universal component that can detect forces in multiple directions and generate multiple detection outputs, replacing the need for multiple specialized sensors and reducing the overall cost of the device.
3Measurement precision
If the detection portion is set at a neutral point between starting point and end point of detection operation range, then the detection accuracy for different directions is improved, but the device structure becomes more complex
Solution Approach 1:
The detection portion is positioned at a specific neutral point within the detection operation range, creating a local optimal detection zone. This neutral point position ensures that the sensor can accurately detect forces in different directions by maintaining a balanced starting position, with the first detection output increasing in one direction and the second detection output increasing in the opposite direction.
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
Enables distinct detection of operating forces and strokes in different directions with a single pressing force sensor, reducing the number of sensors needed and maintaining device flexibility.
Implementation Method 1
an operation body 2 pressed by an elastic member against an actuator 12 of the pressing force sensor 10
Data Source
AI summary
An operation body is oscillatably supported by a fulcrum member. One side of the operation body is in contact with a projection of an actuator of a pressing force sensor, and a preload is applied to another side of the operation body by a compression coil spring as a preloading elastic member. By the preload, a detection output of the pressing force sensor is set at a neutral point. An operating force by which the one side of the operation body is pressed and an operating force by which the other side of the operation body is pressed can be distinctly detected with the single pressing force sensor.