Nail Printing Device Curved Surface Control
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Solution Overview
Problem
Nail printing devices often face issues with color tone and fineness mismatch between the displayed nail design on the screen and the actual printed result due to differences in display screen resolution and printing unit resolution, and users cannot easily show or confirm printed designs to others without the device's presence.
Innovation Solution
A nail printing device with a control unit that sets printing modes for nail or printing medium surfaces, using a printing head to apply ink and includes a photography unit to capture fingernail images, extract nail regions, and create positionally aligned images for precise printing on nails or printing media, allowing for trial prints on paper to confirm designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display screen resolution is lower than the printing unit resolution, then the display can be more compact and cost-effective, but the color tone and image quality between display and print output do not match
Solution Approach 1:
The patent creates a physical copy of the nail design on paper media before actual nail printing. This paper copy serves as a reference that accurately represents the final print output, allowing users to verify color tone and image quality without relying on the display screen. The copying principle resolves the contradiction by providing a true-to-life reference that bridges the gap between low-resolution display and high-resolution print output.
2Adaptability or versatility
If the user wants to show the selected nail design to another person for consultation, then the design selection can be more collaborative, but the user must take the other person to the device location
Solution Approach 1:
The patent extracts the nail design image from the device and transfers it to a portable paper media. This extracted physical copy can be easily carried and shown to others at any location, eliminating the need to move the device or the user to the device location. The extraction principle resolves the contradiction by separating the design information from the device, making it portable and shareable.
3Ease of manufacture
If traditional printing methods are used without considering nail surface curvature, then the printing process is simpler, but the print quality on the curved nail surface is poor
Solution Approach 1:
The patent applies different processing to different regions of the image data based on the nail surface curvature characteristics. The control unit divides the printing area into multiple regions and adjusts the dot arrangement or ink deposition accordingly - with higher density in curved regions and lower density in flat regions. This local quality adjustment ensures uniform print appearance across the curved nail surface while maintaining process simplicity.
Data Source
AI summary
A nail printing device includes a printing unit including a printing head which applies ink on a print target surface, and a control unit which controls the printing unit and sets a printing mode to a nail printing mode or a printing medium printing mode. In the nail printing mode, the control unit sets a surface of a nail portion as the print target surface and creates a nail printing image data for printing the surface of the nail portion corresponding to a curve-shape of the nail portion. In the printing medium printing mode, the control unit sets a planar surface of a printing medium as the print target surface and performs thinning correction to a nail printing image data formed corresponding to the curve-shape of the nail portion.