Eyeliner Stencil With Angled Notch For Symmetric Wing Application
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Solution Overview
Problem
Existing stencils for applying eyeliner struggle with intuitive use, precision, repeatability, and symmetry when drawing a wing of eyeliner at the outer corner of the eye, particularly due to difficulties in positioning and the dependency of notch segments, leading to asymmetry and the need to close the eye during application.
Innovation Solution
A stencil with a rectilinear positioning edge and a notch forming an angle of 95° to 145°, preferably 110° to 130°, allowing parallel placement to the face's midline for precise and symmetrical application, along with a sealing rim for improved leaktightness and a triangular shape for intuitive use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the positioning edge is placed horizontally at the outer corner of the eye, then the stencil can be positioned on the eyelid, but the curvature of the face leads to difficulty in repeating the position from one application to another
Solution Approach 1:
The positioning edge is designed as an arc rather than a straight line, matching the curvature of the face. This curved positioning edge follows the natural contour of the eye area, enabling consistent and repeatable positioning across multiple applications while maintaining ease of use.
2Device complexity
If the notch segments are dependent on each other, then the stencil structure is simplified, but the drawing precision and symmetry of the eyeliner wing are compromised
Solution Approach 1:
The notch is divided into multiple independent segments (first segment, second segment, third segment) that can be positioned and adjusted independently. This segmentation allows each segment to be precisely aligned with anatomical landmarks, improving drawing precision and symmetry while maintaining a relatively simple overall stencil structure.
3Ease of operation
If the eye is closed during eyeliner application, then the stencil can be positioned on the eyelid, but the operation becomes tricky and difficult to repeat
Solution Approach 1:
The stencil is designed with pre-defined positioning features (arc-shaped positioning edge, specifically angled segments) that establish correct alignment before the actual eyeliner application begins. This preliminary positioning structure guides the user through the entire process, making the application easier and more repeatable without requiring the eye to be closed.
4Manufacturing precision
If the positioning edge is placed parallel to the midline of the face, then symmetrical application between eyes is achieved, but the notch position dependency creates asymmetry
Solution Approach 1:
The notch segments are designed with asymmetric angular relationships to the positioning edge (specific angles for first, second, and third segments). This asymmetric configuration compensates for anatomical variations and ensures that when the positioning edge is aligned parallel to the midline of the face, symmetric eyeliner wings are produced on both eyes, while maintaining a relatively simple stencil structure.
Data Source
AI summary
A stencil suitable for the application of a wing (V) of eyeliner at the outer corner of an eye, that includes a planar main body having a first and a second opposing front faces, a lateral edge portion including a positioning edge, wherein the positioning edge includes a notch defining a receiving space for the eyeliner, the notch including a first segment having a first end connected to the positioning edge and a second opposite end, the positioning edge is configured to be placed parallel to the midline of the face, and the first segment forms, with the positioning edge, an angle α of between 95° and 145°.