Cosmetic Applicator Bristle Crown Angles for Multi-Angle Eyelash Coating

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Solution Overview

Problem

Existing cosmetic applicators, particularly those with twisted wire cores and injection-molded bristle carriers, struggle to achieve optimal bristle orientation for effective mascara application, whether tangentially, frontally, or diagonally to the eyelashes.

Innovation Solution

A cosmetic applicator with a core carrying multiple bristle crowns, where each bristle crown consists of bristles held integrally on the core, with specific bristle alignment angles (137.5° with tolerances) to allow for high variability and effective application across different angles.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If bristles are injection moulded together with the applicator core, then the bristles achieve precise geometric positioning, but the applicator cannot adapt to different application angles (tangential, frontal, diagonal)

Engineering Contradiction:

Improvebristle geometric positionVSAvoidapplication angle adaptability

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The applicator head is divided into multiple bristle crowns arranged circumferentially around the core axis. Each bristle crown contains bristles oriented at specific angles (137.5° relative to the previous crown), creating segmented functional zones that can independently engage with lashes at different angles of approach

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different bristle crowns are positioned and oriented to provide locally optimized bristle directions for specific application scenarios. The first bristle crown handles frontal application, while subsequent crowns at 137.5° intervals handle tangential and diagonal applications, giving each local region specialized functionality

Inventive Principle:

Principle #3Local quality

2Strength

If twisted wire core brushes are used, then the applicator is robust and powerful, but it is not possible to give each individual bristle the exact geometric position it should ideally occupy

Engineering Contradiction:

Improveapplicator robustnessVSAvoidbristle geometric position

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The applicator combines the robust wire core structure with precisely positioned bristle crowns that are integrally formed with the core. This composite construction maintains the mechanical strength of twisted wire brushes while achieving the geometric precision of injection-moulded bristle positioning through the 137.5° angular arrangement of multiple crowns

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP4570122A1Cosmetic applicator with specially positioned bristles

Publication Date: 2025.06.18 GEKA

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AI summary

Cosmetic applicator comprising a core carrying a plurality of successive bristle crowns, each consisting of a number of bristles integrally attached thereto, whereby each bristle crown has at least one and preferably only bristles whose central longitudinal axis makes an angle of 137.5° with the central longitudinal axis of a bristle of an immediately preceding bristle crown in the direction of the applicator's longitudinal axis.