Ridge-Tipped Cosmetic Brush for Precise Lash Application

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Solution Overview

Problem

Existing brushes for applying cosmetic products like serums to eyelashes are too large, making it difficult to reach small lashes at the bottom lash line and prone to excess product falling into the eye.

Innovation Solution

A small, ergonomic brush with a unique design featuring a support head and bristles that allow precise application of cosmetic products, including a receptacle with a wiper to prevent excess product from falling into the eye.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a large brush is used for applying serum, then the brush can cover a larger area, but it cannot reach small lashes at the bottom lash line and causes excess product to fall into the eye

Engineering Contradiction:

Improvebrush sizeVSAvoidprecision of application

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

The brush is segmented into a small, compact applicator head with bristles arranged in multiple rows, allowing precise access to individual lashes while maintaining control to prevent excess product application

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The brush features a localized application area with bristles of varying lengths and densities in different zones, enabling precise product deposition on specific lash areas without affecting surrounding regions

Inventive Principle:

Principle #3Local quality

2Productivity

If a large brush is used for applying serum, then the brush can apply product to more lashes, but it takes an excessive amount of content from the container

Engineering Contradiction:

Improvenumber of lashes coveredVSAvoidproduct waste

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The brush is designed to take only the partial amount of product needed for effective application, avoiding excessive product pickup that would lead to waste and potential contamination in the eye

Inventive Principle:

Principle #16Partial or excessive action

3Ease of operation

If a small brush is used for applying serum, then the brush can reach small lashes at the bottom lash line, but it may require re-dipping into the product container

Engineering Contradiction:

Improveaccess to small lashesVSAvoidfrequency of re-dipping

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The brush is pre-loaded with an optimal amount of product capacity in its reservoir, allowing multiple applications without re-dipping, and the bristle configuration is designed to distribute product efficiently across all lashes in a single pass

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12433392B2Brush for applying a cosmetic or a care product

Publication Date: 2025.10.07 APR BEAUTY GRP INC

AI summary

A brush for applying a product including a cosmetic, care, or pharmaceutical product onto the keratinous surface of a user. The applying member includes a support head and a plurality of bristles extends from a distal end face of the support head along a longitudinal axis of the support head. The distal end face of the support head comprises a first distal end face and a second distal end face. The first distal end face and the second distal end face are substantially flat surfaces that intersect each other to form a ridge on the distal end face. The ridge on the distal end face extends along an axis perpendicular to a longitudinal axis of the support head.