Tilting Input Surface for Uniform Push Load Sensing
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Solution Overview
Problem
Existing input devices with force sensing capabilities experience varying detection sensitivity due to different operation positions on the surface, leading to inconsistent detection of pushing loads even when the same load is applied.
Innovation Solution
The input device incorporates a first pressing member with a tiltable operation surface and a second pressing member, where the position of the first axis is variable based on the pushed position, ensuring that the pressure sensor detects a consistent pushing load regardless of the position on the operation surface by utilizing a tiltable mechanism and pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a force sensing device uses fixed pressure sensors at specific positions, then the device structure is simple, but the detection sensitivity varies depending on the pushed position
Solution Approach 1:
The first pressing member is designed to be tiltable around a first axis, and the second pressing member is tiltable around a second axis. This dynamic mechanism allows the pressure sensor position to effectively change according to the pushed position, maintaining consistent detection sensitivity across different operation locations without requiring multiple fixed sensors.
Solution Approach 2:
The position of the first axis in the first pressing member is variable in accordance with the pushed position on the operation surface. By changing the parameter (axis position) based on the input location, the system maintains uniform detection sensitivity regardless of where the user pushes, resolving the contradiction between simple structure and consistent measurement precision.
2Reliability
If the same pushing load is applied at different positions on the operation surface, then the operation is consistent, but the detected pushing load varies due to position-dependent sensitivity
Solution Approach 1:
The tiltable mechanism provides automatic feedback adjustment: when force is applied at different positions, the pressing members tilt accordingly, which automatically adjusts the effective sensing position to compensate for the varying sensitivity. This feedback mechanism ensures that the detected pushing load accurately reflects the actual applied load regardless of position, improving both reliability and measurement precision.
Solution Approach 2:
The dynamic tilting action of the pressing members adapts the sensor system to the input position in real-time. This dynamic adjustment ensures that the same pushing load produces consistent detection results across different positions, resolving the contradiction between detection consistency and measurement accuracy.
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 ensures that the same pushing load is consistently detected across different positions on the operation surface, enhancing the accuracy and reliability of the input device's pressure sensing capabilities.
Implementation Method 1
Each of the two inner electrodes forms capacitance between the displacement electrode and itself, thereby constituting a pressure sensor. The force detecting device is configured to detect a pushing load input to the operation body with reference to a change in the capacitance of the respective pressure sensors.
Data Source
AI summary
An input device is provided which is configured such that no matter which position on an operation surface is pushed, the detection sensitivity of the pushing load is suppressed from varying due to different operation positions on the operation surface. An input device includes a first pressing member, a second pressing member, and a substrate. The first pressing member has an operation surface and a first axis and is tiltable around the first axis by the operation surface being pushed. The second pressing member has a second shaft and is tiltable around the second shaft by being pushed by a tilt of the first pressing member. The substrate includes at least one pressure sensor which is to be pushed by the second pressing member. A position of the first axis in the first pressing member is variable in accordance with a pushed position on the operation surface.