Eyeliner Applicator Tip with Convex Cavity for Split Lines
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Solution Overview
Problem
Existing eyeliner applicators do not effectively allow users to draw specific lines, such as double lines or lines that split along the eyelid, during application.
Innovation Solution
A device with an applicator tip featuring a cavity bordered by convex edges, allowing for the creation of split lines by varying the tip's inclination during application, and made of felt for capillary diffusion of the eyeliner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional flat applicator tip is used, then the application is simple and the device is easy to manufacture, but the user cannot draw split lines or double lines on the eyelid
Solution Approach 1:
The applicator tip surface is segmented into multiple functional zones by introducing cavities with convex edges. These cavities divide the application surface into distinct regions that can be selectively contacted with the eyelid, enabling the user to draw single lines, split lines, or double lines by varying the angle and pressure of application.
Solution Approach 2:
Different regions of the applicator tip are given different geometric properties through the cavity structure. The convex edges and cavity walls create localized contact points with specific curvature and pressure distribution characteristics, allowing each region to serve a specific makeup function (single line, split line, or double line).
2Adaptability or versatility
If the applicator tip is made with a complex cavity structure to enable split lines, then versatility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cavity structure incorporates convex edges and curved surfaces that can be efficiently manufactured using molding or shaping processes. The curvature of the convex edges is designed to naturally distribute product and contact pressure, achieving the desired split line effect while remaining compatible with standard manufacturing techniques for applicator tips.
3Measurement precision
If the cavity edges are sharp to define precise lines, then line definition is improved, but the applicator may be harsh on the skin
Solution Approach 1:
The convex edges of the cavities are designed with curved, rounded profiles rather than sharp edges. This curvature maintains precise line definition by creating distinct contact points with the eyelid, while simultaneously reducing skin irritation through the smoother, more conforming contact surface that distributes pressure more evenly.
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
Enables easy drawing of split lines along the eyelid, including a single line towards the inner corner, with adjustable width and shape options for precise makeup application.
Implementation Method 1
made of felt for capillary diffusion of the eyeliner
Data Source
AI summary
A device for packaging and applying eyeliner including a container containing the eyeliner to be applied, and an applicator tip defining an application surface for applying the eyeliner contained in the container, having at least one cavity opening on the application surface and being elongate along a longitudinal axis, the cavity being bordered laterally by two walls, the free edges of which, on the application surface side, are convex in shape about an axis perpendicular to the longitudinal axis of the cavity.