Capacitive Knob with Segmented Conductive Terminals
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Solution Overview
Problem
The existing input devices with capacitive touch panels often experience non-detection or erroneous detection of finger touches due to a small difference in capacitance between non-touch and touch states.
Innovation Solution
A knob with a ring-shaped conductive operation portion, supported by a non-conductive rotary member, featuring a ring-shaped concave groove and multiple conductive terminal portions, which are electrically insulated and positioned to enhance capacitance detection, preventing non-detection and erroneous detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single conductive terminal portion is used on the knob, then the structure is simple, but the capacitance difference between touch and non-touch states is small causing non-detection or erroneous detection
Solution Approach 1:
The conductive operation portion is divided into multiple conductive terminal portions (first, second, third terminal portions) that are electrically insulated from each other. Each terminal portion independently detects capacitance changes, and the control unit integrates signals from multiple terminals to determine touch state, thereby improving detection reliability while maintaining manageable structural complexity through systematic segmentation.
Solution Approach 2:
The control unit acts as an intermediary that receives capacitance change signals from multiple conductive terminal portions, processes these signals by comparing against threshold values, and determines the final touch state. This intermediary processing layer integrates information from multiple sensors to improve detection accuracy and prevent erroneous detection.
2Measurement precision
If multiple conductive terminal portions are used to improve detection accuracy, then touch detection reliability improves, but the manufacturing complexity increases
Solution Approach 1:
The operation portion is segmented into multiple conductive terminal portions with electrical insulation between them. Each terminal portion can be manufactured as a separate component and then assembled onto the knob body, allowing for standardized production processes and quality control for each terminal while achieving improved measurement precision through multiple detection points.
Solution Approach 2:
The design incorporates multiple conductive terminal portions as a form of redundancy before manufacturing defects or detection failures can occur. By having multiple independent detection points, the system compensates for potential manufacturing variations or defects in individual terminals, ensuring reliable detection without requiring extremely high precision in any single component.
3Reliability
If the operation portion is divided into multiple electrically insulated areas, then capacitance detection accuracy improves, but the device complexity increases
Solution Approach 1:
The operation portion is divided into multiple conductive terminal portions that are electrically insulated from each other through non-conductive structures. Each terminal portion corresponds to a specific detection zone on the touch panel, allowing independent capacitance measurement. The control unit processes signals from each terminal to determine touch state, improving reliability through diversified detection points while managing structural complexity through modular segmentation.
Solution Approach 2:
The invention transitions from a single-point detection approach to a multi-point spatial distribution of conductive terminals on the operation portion. By distributing terminals across different areas of the knob and corresponding to different regions on the touch panel, the system adds spatial dimensionality to detection, improving reliability without requiring complex internal structures within each terminal.
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 design effectively increases the accuracy of finger touch detection by enhancing the capacitance difference, thereby preventing non-detection and erroneous detection.
Implementation Method 1
the capacitance of the touch panel changes depending on the current. The touch panel detects a touch of a finger on the basis of the difference between the capacitance at the time of non-touch of any finger and the capacitance at the time of the touch of the finger
Data Source
AI summary
It includes: an operation portion comprised of a ring-shaped conductive member, a rotational operation being performed on the operation portion; a rotary supporting member comprised of a ring-shaped non-conductive member and fixed onto a capacitive type touch panel, the rotary supporting member rotatably supporting the operation portion; a ring-shaped concave groove disposed in the rotary supporting member; and conductive conducting terminal portions electrically connected to the operation portion, the conductive conducting terminal portions being rotated inside the concave groove integrally with the operation portion, positions of the conducting terminal portions being detected by the touch panel, wherein the operation portion is divided into a plurality of areas electrically insulated from each other in a circumferential direction, and at least two of the conducting terminal portions are mounted to different areas of the plurality of areas.