Touch Panel Cover Glass with Variable Curvature Design
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Solution Overview
Problem
Conventional touch panels with uniformly curved cover glasses either impair the operation feel due to sharp curvature or fail to match the design member's appearance with gentle curvature, leading to a discontinuous surface.
Innovation Solution
A touch panel design featuring a cover member with a glass plate and a sensor body attached to a housing space, where the operation portion has a larger radius of curvature for smooth operation and design connection portions with a smaller radius of curvature to match the contoured surface of the design member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the entire surface of the cover glass is curved with a small radius of curvature to match the appearance of the design member, then the appearance continuity is improved, but the operation feel is impaired due to sharp curvature
Solution Approach 1:
The cover glass is divided into two regions with different curvature radii: the peripheral portion has a small radius of curvature to match the contoured surface of the design member, while the operation surface has a large radius of curvature to provide comfortable touch operation. This local differentiation of geometric properties resolves the contradiction between appearance matching and operational comfort.
2Ease of operation
If the entire surface of the cover glass is curved with a large radius of curvature to improve operation feel, then the operation comfort is improved, but the appearance continuity is degraded as the peripheral portion does not match the contoured surface
Solution Approach 1:
The cover glass employs different curvature radii in different regions: a large radius of curvature for the operation surface to ensure comfortable touch operation, and a small radius of curvature for the peripheral portion to continuously match the contoured surface of the design member. This spatial variation in geometric properties simultaneously satisfies both operational comfort and appearance continuity requirements.
3Ease of manufacture
If the cover glass surface is uniformly curved, then the manufacturing process is simplified, but the touch panel cannot simultaneously achieve appearance matching and comfortable operation
Solution Approach 1:
The cover glass is designed with spatially varying curvature properties, where the peripheral portion and operation surface have different radius of curvature values. This localized differentiation enables the touch panel to simultaneously achieve appearance continuity with the design member and comfortable operation feel, overcoming the limitation of uniform curvature designs that can only satisfy one function.
Solution Approach 2:
The cover glass surface is segmented into functionally distinct regions: a peripheral region optimized for appearance matching with small curvature radius, and an operation region optimized for touch comfort with large curvature radius. This segmentation allows each region to independently fulfill its specific functional requirement without compromising the other.
Data Source
AI summary
A first member of a cover member includes an operation portion disposed so as to correspond to a position where a sensor body is attached and having a sensor region (T) of substantially the same size as a sensor unit on the front side of the operation portion, and a design connection portion that is continuous with a side part of the operation portion and that has a surface formed so as to be continuous with a contoured surface of a wall and curved with a smaller radius of curvature than a surface shape of the operation portion.