Rotary Switch Conductive Member Segmentation for Touch Panel Accuracy
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Solution Overview
Problem
Existing operation devices with touch panels and mechanical switches face challenges in accurately detecting the position of a rotary switch's electrode due to conductive materials inducing responses from the touch panel, leading to incorrect detection of the electrode's position.
Innovation Solution
A mechanical switch design featuring a conductive member that coats the outer circumferential surface of the rotary part, except for a region near the touch panel, preventing unnecessary responses and ensuring accurate detection by only connecting to the electrode in specific areas, with a non-conductive luster layer providing a consistent appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conductive member circumferentially coats the entire outer circumferential surface of the rotary part, then the appearance is uniform and aesthetic, but the touch panel detects false responses from the conductive material, leading to incorrect electrode position detection
Solution Approach 1:
The conductive member is segmented into two distinct regions: a first region that circumferentially coats the outer circumferential surface of the rotary part to provide uniform appearance, and a second region that is separated from the first region by a non-conductive gap. This segmentation allows the conductive member to fulfill both aesthetic and functional requirements without causing false touch panel responses.
Solution Approach 2:
The conductive member exhibits different properties in different regions: in the first region, it provides conductive properties for aesthetic uniformity, while in the second region, it is separated by a non-conductive gap to prevent false detection. This local differentiation of conductive properties resolves the contradiction between appearance uniformity and detection accuracy.
2Measurement precision
If the conductive member is separated into distinct regions with a non-conductive gap, then accurate electrode detection is achieved, but the appearance uniformity is compromised
Solution Approach 1:
The conductive member is designed with localized conductive properties where the first region provides continuous circumferential conduction for aesthetic uniformity, while the second region is separated by a non-conductive gap to enable accurate electrode detection. This local quality differentiation resolves the apparent contradiction by assigning different functional properties to different spatial regions.
Solution Approach 2:
The conductive member is divided into functionally distinct segments: the first region maintains continuous circumferential conduction for appearance, while the second region is segmented off by a non-conductive gap for accurate detection. This segmentation strategy allows both requirements to coexist in the same component.
3Strength
If the rotary part is made of conductive material for structural integrity, then mechanical strength is improved, but the touch panel responds to the conductive material itself, causing incorrect position detection
Solution Approach 1:
The rotary part is designed with a segmented conductive member where the first region maintains continuous conduction for structural integrity and appearance, while the second region is separated by a non-conductive gap. This segmentation allows the rotary part to maintain mechanical strength while preventing false touch panel responses during electrode detection.
Solution Approach 2:
A non-conductive gap acts as an intermediary element between the conductive member regions, allowing the rotary part to maintain its conductive structural integrity while preventing the conductive material from interfering with touch panel detection. This intermediary non-conductive region resolves the conflict between mechanical strength and detection accuracy.
Data Source
AI summary
The present disclosure provides an operation device including a touch panel and a mechanical switch. The mechanical switch includes a fixed part, a rotary part, an electrode, and a conductive member. The electrode is provided on an opposing surface of the rotary part facing the touch panel. The conductive member circumferentially coating an outer circumferential surface of the rotary part and connected to the electrode. The conductive member is provided in a first region of the outer circumferential surface except for a region within a predetermined dimension from the opposing surface in a direction away from the touch panel. The conductive member is further provided in a second region of the outer circumferential surface extending from the first region and connected to the electrode.