Nail Printer Finger Alignment via Fingerprint Sensor Feedback
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Solution Overview
Problem
Users face difficulties in accurately positioning their fingers for nail printing, leading to potential inaccuracies in nail design placement and unnatural postures, which can result in suboptimal printing quality.
Innovation Solution
A nail printer equipped with a fingerprint sensor to acquire reference information, a memory to store this information, and a placement table shifter that adjusts the finger placement table to align the finger correctly based on the comparison of current and reference positional information, ensuring proper alignment for printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the user manually positions the finger at a right position for printing, then the printing accuracy is improved, but the user bears the burden of unnatural posture and manual adjustment effort
Solution Approach 1:
The system performs self-positioning by automatically detecting the finger's actual position using a camera and fingerprint sensor, then autonomously adjusting the placement table to align the finger with the print head. This eliminates the need for manual positioning effort while maintaining high printing accuracy.
Solution Approach 2:
The patent replaces manual mechanical positioning with an automated system combining visual recognition (camera), fingerprint detection (sensor), and motorized table adjustment. This substitutes human effort with automated detection and control mechanisms.
2Manufacturing precision
If the finger is fixed at a proper position with a fixture, then the printing position accuracy is improved, but the device complexity increases
Solution Approach 1:
Instead of a static fixture, the patent employs a dynamic placement table that can be automatically shifted in real-time based on detected finger position. This dynamic adjustment mechanism replaces complex fixed fixtures with a simpler, adaptable motorized table.
Solution Approach 2:
The system uses camera and fingerprint sensor feedback to continuously monitor finger position and automatically adjusts the placement table accordingly. This closed-loop control eliminates the need for complex mechanical fixtures by using real-time detection and correction.
3Ease of operation
If the user places the finger at a wrong position or improper angle, then the ease of operation is improved, but the printing quality deteriorates due to inaccurate recognition
Solution Approach 1:
The camera and fingerprint sensor provide continuous feedback on finger position and orientation. Even when the user places the finger at an improper angle, the system detects the actual position and automatically adjusts the placement table to achieve correct alignment, maintaining both ease of operation and printing quality.
Solution Approach 2:
Instead of requiring the user to position the finger correctly relative to the print head, the system inverts the approach by keeping the print head fixed and automatically moving the placement table to bring the finger into the correct position. This reverses the traditional positioning paradigm.
Data Source
AI summary
A nail printer includes a print head, a placement table, a fingerprint sensor, a memory, a placement table shifter and a processor. The fingerprint sensor acquires reference information including a reference fingerprint image and reference positional information on a position of the reference fingerprint image in the placement table from an object placed at a reference position which is a position suitable for printing on a nail of the object on the placement table with the print head. The processor compares positional information on a fingerprint image of the object currently placed on the placement table with the reference positional information preliminarily stored in the memory, and controls the placement table shifter to shift the object based on a result of the comparing such that the position of the object on the placement table substantially agrees with the reference position.