Surface Structure Fine Convex Portions Delicate Touch
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Solution Overview
Problem
Vehicular interior components lack specific definitions for linear groove and concave-convex pattern sizes, making it difficult to achieve a delicate-and-soft touch feeling when a human finger touches the surface.
Innovation Solution
A surface structure with fine convex portions having diameters between 15 μm to 40 μm is formed on the surface, along with concave portions of specified dimensions, to ensure a precise tactile interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If linear groove portions and concave-convex patterns are formed on the surface of vehicular interior components, then the external view and touch feeling are improved, but the touch feeling is not delicate-and-soft like fingerprint without specific size definitions
Solution Approach 1:
The patent applies parameter changes by specifying precise dimensional parameters for the convex portions (diameter: 15-40 μm, height: 10-30 μm) and concave portions (depth: 5-20 μm). These quantitative parameter definitions transform the vague concept of 'concave-convex patterns' into precisely controlled surface features that reliably produce fingerprint-like tactile sensations, resolving the contradiction between improving touch feeling and maintaining manufacturing precision.
2Ease of manufacture
If the size of linear groove portion and concave-convex pattern are not specifically defined, then manufacturing is simpler, but it is difficult to obtain delicate-and-soft touch feeling when finger touches the surface
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges for surface features that balance manufacturing feasibility with tactile performance. The convex portion diameter of 15-40 μm and height of 10-30 μm, along with concave portion depth of 5-20 μm, represent optimized parameters that are precise enough to generate fingerprint-like touch feelings but broad enough to accommodate manufacturing variations, thus maintaining ease of manufacture while improving touch feeling quality.
3Ease of operation
If fine convex portions with diameter of 15 μm to 40 μm are formed on the surface, then a delicate-and-soft touch feeling like fingerprint is obtained, but the surface structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the surface into distinct functional elements: convex portions (15-40 μm diameter) that contact the fingerprint ridges and concave portions (5-20 μm depth) that receive the fingerprint valleys. This segmented structure, with clearly defined geometric parameters, creates the fingerprint-like tactile sensation through systematic division of surface features rather than random complexity, resolving the contradiction between achieving delicate touch feeling and maintaining structural simplicity.
Data Source
AI summary
In the surface structure of an article 7 according to the present invention, a plurality of convex portions 11 are so disposed on a surface 9 as to have intervals relative to each other and a plurality of fine convex portions 21 having a diameter d and a height h smaller than those of the concave portion 11 are formed on the surface of at least the edge portion 15 of the concave portion 11. By this, when a hand touches the surface 9 of the article 7, the proper number of convex portions 21 abut on a linear object 25 constituting a fingerprint 23 of a hand's finger, to thereby allow the human being to obtain a delicate-and-soft touch feeling.