Oblique Branch Cosmetic Applicator Cavity Design
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Solution Overview
Problem
Existing cosmetic applicators, such as those for eyeliner, often fail to provide easy and precise line modulation and frequent reloading, with complex shapes being more effective but harder to manufacture and use.
Innovation Solution
A cosmetic applicator with a stem and an obliquely branching application member forming a cavity, allowing for flexible and ergonomic application, enabling modulation of line thickness and reducing the need for frequent reloading by storing product within the cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex shape applicator end piece is used to draw different line thicknesses, then line modulation capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The applicator member is divided into three distinct branches (first, second, and third branches) that create separate functional zones. Each branch can be optimized independently for its specific function while maintaining overall structural simplicity through injection molding
Solution Approach 2:
The applicator member features an asymmetric design where the first and second branches extend at different angles relative to the longitudinal axis, creating natural variation in line thickness without requiring complex machining. The oblique angles (alpha and beta) differ to achieve different cosmetic effects
2Ease of operation
If an applicator with oblique branches is used to enable line modulation, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The applicator member combines multiple functions into a single integrated structure: product storage (cavity), application (branches with flocked coating), and wiping capability (oblique angles). This merging reduces the number of separate components while maintaining operational simplicity
Solution Approach 2:
Different regions of the applicator member have specialized properties: the first and second branches have specific oblique angles for different line thicknesses, the distal end has a flocked coating for product retention, and the overall structure includes a cavity for product storage. Each local region is optimized for its specific function
3Productivity
If a cavity is incorporated in the applicator member for product storage, then productivity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cavity in the applicator member serves itself by automatically storing cosmetic product during normal use. The user simply dips the applicator into the product container, and the cavity passively accumulates product without requiring active reloading, thereby improving productivity
Solution Approach 2:
The cavity dimensions and shape are optimized as design parameters to provide sufficient product storage capacity while maintaining compatibility with standard injection molding processes. The cavity is formed as an integral part of the applicator member geometry, allowing precise control through molding parameters rather than requiring post-manufacturing precision work
Data Source
AI summary
An applicator (3) for applying a cosmetic product to human keratinous materials, comprises a stem (4) and an applicator member (6) fixed to the stem (4), the applicator member (6) comprising a body comprising a first and a second branch each extending away from the stem obliquely with respect to the longitudinal axis of the stem and diverging outward from one another and being connected by a third branch at their end, this third branch extending obliquely with respect to the longitudinal axis (X) of the stem (4), the first, second and third branches between them forming a cavity (28).