Input Device Electrode Spacing Stability via Biasing Part
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Solution Overview
Problem
Input devices that rely on a predetermined space between electrodes for changing electrical states face instability and decreased sensitivity when this space increases during relative movement, leading to reduced performance.
Innovation Solution
An input device design that includes a first electrode, a support body, a fixed body, a second electrode, a movable body, an operation body, and a biasing part, where the movable body maintains a constant distance between the electrodes through rotation or translation, ensuring stable electrical state changes by applying a biasing force via the biasing part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the second electrode moves relative to the first electrode by rotation or translation to change electrical state, then the input device can detect movement, but the space between electrodes increases causing unstable electrical state change and decreased sensitivity
Solution Approach 1:
A biasing part is introduced as an intermediary element between the movable body (holding the second electrode) and the fixed body (holding the first electrode). This biasing part applies a biasing force to maintain a constant predetermined space between the first and second electrodes during relative movement, ensuring stable electrical state changes and consistent sensitivity throughout the operation range.
2Ease of operation
If the space between first electrode and second electrode increases during relative movement, then the electrodes can move freely, but sensitivity decreases and electrical state change becomes unstable
Solution Approach 1:
The biasing part serves as a mediator that allows free relative movement between the first and second electrodes while simultaneously maintaining a constant predetermined space between them. This enables the electrodes to move freely for operation while preventing space variation that would reduce sensitivity.
3Adaptability or versatility
If a third electrode is used to change electrical state between first and second electrodes, then electrical state can be changed, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the unnecessary third electrode from the system. By using the relative movement between the first and second electrodes directly to change the electrical state (through capacitance variation), the complex three-electrode structure is simplified to a two-electrode structure, reducing device complexity while maintaining electrical state control capability.
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
The input device maintains sensitivity to electrical state changes by keeping the electrode spacing constant during movement, reducing friction and preventing damage, thus ensuring long-term quality and accurate detection.
Implementation Method 1
a biasing part that is disposed between the movable body and the fixed body, and applies, to the movable body, a biasing force toward the support body
Data Source
AI summary
An input device includes: a first electrode; a support body that supports the first electrode; a fixed body fixed above the support body; a second electrode; a movable body that holds the second electrode in a state where the second electrode faces the first electrode with a predetermined space being provided therebetween, and causes the second electrode to approach and recede from the first electrode in a movement direction by rotating; an operation body that is fixed movably relative to the fixed body in a state where the operation body is engaged with the movable body, and causes, by being operated by a user, the movable body to rotate; and a biasing part that is disposed between the movable body and the fixed body, and applies, to the movable body, a biasing force toward the support body.