Makeup Brush Composite Curved Tip for Gradation
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Solution Overview
Problem
Conventional makeup brushes struggle to apply cosmetic powders like blushers and eyeshadows evenly and create subtle gradations without requiring special makeup techniques.
Innovation Solution
A makeup brush with a cylindrical member having an arc-shaped upper opening and a composite curved tip surface, where bristles gradually increase in length from the inner to the outer curved surface, allowing for easy application and natural gradations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional brushes with simple shapes are used, then the brush structure is simple and easy to manufacture, but the makeup application cannot create subtle gradations and requires special techniques
Solution Approach 1:
The brush tip surface is designed as a composite curved surface with specific curvature radii (R1=5-60mm, R2=5-80mm) instead of a flat or simple rounded surface. This curvature design allows the brush to naturally create gradations when applied to the face, enabling easy makeup application without requiring special techniques from the user.
Solution Approach 2:
The brush bristles are arranged with varying lengths across different regions of the tip surface. The bristle length changes along both the arc length direction and the radial direction from the center, creating local variations in bristle properties that enable different application effects in different areas, thus creating natural gradations.
2Manufacturing precision
If brushes with varying bristle lengths are used to create gradations, then beautiful finish is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
By defining the brush tip as a composite curved surface with specific curvature radii ranges (R1=5-60mm, R2=5-80mm), the patent provides clear manufacturing guidelines that balance precision requirements with ease of production. The curvature parameters give manufacturers specific targets to aim for while allowing reasonable tolerances.
Solution Approach 2:
The patent specifies parameter ranges rather than fixed values for curvature radii and bristle lengths. This approach allows manufacturing flexibility while ensuring the functional performance is achieved, making it easier to manufacture while maintaining the gradient creation capability.
Data Source
AI summary
[Problem] This invention provides a makeup brush that not only enables easy application of cosmetics such as blushers and eyeshadows while creating gradations, but also achieves a beautiful finish, without requiring special makeup techniques.[Solution] A makeup brush 1, wherein an upper opening portion 2a of a cylindrical member 2 is formed into an arc shape having a predetermined width when planarly viewed, and a tip surface 3a of a brush 3 that is formed by tips of bristles extending upward from the upper opening portion of the cylindrical member is a composite curved surface having a first protruding curved surface 6 that is formed in such a manner that a length of brush bristles becomes gradually longer from an inner curved surface 4 having the arc shape toward an outer curved surface 5 having the arc shape, and a second protruding curved surface 7 that is formed in such a manner that the length of the brush bristles gradually changes along a length direction of the arc shape and that the brush bristles are the longest at approximately a central portion.