Eyelash Brush with Segmented Core and Cutouts
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Solution Overview
Problem
Conventional mascara brushes with twisted metal wire cores have limited effectiveness in loading and separating eyelashes due to their cylindrical shape, making it difficult to apply makeup, especially at the corner of the eye, and require numerous tests to achieve optimal results.
Innovation Solution
A brush with a twisted core that has a rectilinear proximal portion and a distal portion with a bend, along with longitudinally extending cutouts, allowing for better product distribution and easier application, enabling precise makeup application while maintaining good visibility and reducing hand movement difficulty.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brush core is made fully curved along its entire length, then the brush can reproduce the shape of the eyelashes and improve makeup application, but the brush becomes difficult to manufacture and requires complex positioning of cutouts
Solution Approach 1:
The brush core is divided into two distinct portions: a rectilinear proximal portion that is easy to manufacture and a curved distal portion that contacts the eyelashes. This segmentation allows each portion to be optimized independently for its specific function while simplifying the overall manufacturing process
Solution Approach 2:
Different portions of the brush core are given different geometries suited to their specific functions: the proximal portion is rectilinear for easy manufacturing and positioning, while the distal portion is curved to match the eyelash shape and enable effective makeup application
2Reliability
If the envelope surface is given a complex shape to create zones for product loading and separation, then the makeup effectiveness is improved, but the manufacturing complexity increases and requires numerous tests
Solution Approach 1:
The envelope surface is segmented into distinct functional zones through longitudinal cutouts, creating proximal loading zones and distal separation zones. This segmentation provides clear functional differentiation without requiring complex overall brush geometry
Solution Approach 2:
The cutouts are positioned asymmetrically along the brush core, with different configurations in the proximal and distal portions, allowing optimization of product loading and separation functions while maintaining manufacturability
3Productivity
If the brush is made rectilinear for easy manufacturing, then the manufacturing efficiency is improved, but the brush cannot easily reach the corner of the eye and application precision is reduced
Solution Approach 1:
The brush core is segmented into rectilinear and curved portions, allowing the proximal part to be manufactured efficiently with standard processes while the distal part provides the necessary curvature for precise application at the corner of the eye
Solution Approach 2:
The brush core transitions from a two-dimensional rectilinear structure to a three-dimensional curved structure in the distal portion, enabling the brush to adapt to the complex geometry of the eye corner while maintaining manufacturing efficiency in the proximal portion
Data Source
AI summary
The present invention relates to a brush (10) for applying a product (P) to the eyelashes and/or eyebrows, comprising: a core (40), notably a twisted core, extending along a longitudinal axis (X), comprising a portion of the core carrying the bristles that has a proximal end intended to be fixed to a stem and a distal end, the portion of the core carrying the bristles having a rectilinear proximal portion that extends along more than half of its length from the proximal end of the portion of the core carrying the bristles, and having at least one bend made at the distal end of the portion of the core carrying the bristles, and bristles (41) held by the core (40), the bristles (41) having free ends that define an envelope surface, the envelope surface having at least one longitudinally extending cutout.