Asymmetric Lipstick Cross-Section for Top and Bottom Lip Adaptation
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Solution Overview
Problem
Conventional lip applicators, such as lipsticks, often use a one-size-fits-all approach that does not account for the different characteristics of the top and bottom lips, leading to inefficient application.
Innovation Solution
A lip applicator device with a non-cylindrical cross section, featuring a larger curved arc for the bottom lip and a smaller arc for the top lip, allowing for tailored application surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional cylindrical lipstick body with a one-size-fits-all approach is used, then the manufacturing process is simple and the structure is uniform, but it cannot effectively accommodate the different characteristics of the top and bottom lips
Solution Approach 1:
The patent applies asymmetry by designing a lipstick body with a non-cylindrical cross-section where the perimeter varies around the circumference. Specifically, the cross-section includes a first peripheral portion and a second peripheral portion with different lengths, creating an asymmetric shape that can be differentiated into regions for applying to the top lip and bottom lip respectively. This asymmetric geometry allows the single lipstick body to adapt to the different characteristics of top and bottom lips without requiring multiple products or complex mechanisms.
Solution Approach 2:
The patent implements local quality by creating different surface characteristics at different locations of the lipstick body. The application surface is divided into multiple regions with different geometries - for example, a first application region corresponding to the first peripheral portion and a second application region corresponding to the second peripheral portion. Each region has locally optimized properties suited for its specific function, allowing the lipstick to provide tailored application experience for different lip areas while remaining a single integrated structure.
2Manufacturing precision
If a single application surface is used for both top and bottom lips, then the device structure remains simple, but the application precision and effectiveness are reduced
Solution Approach 1:
The asymmetric cross-section design creates distinct geometric regions that can be precisely mapped to different lip areas. The varying perimeter lengths and shapes of different portions of the cross-section enable the lipstick to achieve better application precision by providing differently shaped contact surfaces for the top and bottom lips, which have different anatomical characteristics.
Solution Approach 2:
By dividing the application surface into multiple regions with locally optimized geometries, the patent enhances application precision for each specific lip area. Each peripheral portion and its corresponding application region is designed with specific dimensional characteristics that match the target lip area, thereby improving the overall application effectiveness without requiring multiple separate products.
Data Source
AI summary
A lip application device, such as a lipstick, may have four peripheral portions in its cross section. The cross section may have a center through which a radial axis extends in parallel to the cross section, dividing the cross section into left and right sides. A first portion may form a first arc centered at the radial axis and having an outward radial direction stemming from the center. A second portion may form a second arc centered at the radial axis and having an outward radial direction stemming from the center, the second arc being opposite to the first arc and being longer than the first arc. A third portion and a fourth portion may be substantially straight lines, one connecting the ends points of the two arcs in the left side and other connecting the end points of the two arcs in the right side.