Diaper Sensor Water-Permeable Sheet and Absorbing Layer
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Solution Overview
Problem
The existing diaper sensors have limitations in reliably sensing when they are soaked in liquid, leading to inconsistent detection performance.
Innovation Solution
A diaper sensor system is designed with a sheet-shaped wetness detection device that includes a highly water-permeable sheet on the user's body surface and at least one water-absorbing sheet to quickly absorb liquid and supply it to a circuit breakable or damageable wetness detection sensor, ensuring reliable detection of liquid presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a wetness detection sensor device with a circuit breakable or damageable when getting wet is used, then liquid presence can be detected, but the reliability of sensing the diaper sensor being soaked in liquid is insufficient
Solution Approach 1:
A water-absorbing sheet is introduced as an intermediary between the liquid source and the wetness detection sensor device. This intermediary rapidly absorbs liquid and supplies it to the sensor, ensuring the sensor reliably detects the soaking state. The water-absorbing sheet acts as a mediator that enhances the interaction between liquid and sensor, solving the reliability issue without compromising detection accuracy.
Solution Approach 2:
The water-absorbing sheet performs preliminary action by rapidly absorbing liquid before it reaches the sensor device. This pre-absorption ensures that the sensor receives sufficient liquid contact to trigger detection, thereby improving reliability of soaking state sensing while maintaining measurement precision.
2Reliability
If a water-absorbing sheet is added to improve liquid supply to the sensor, then sensing reliability improves, but the device structure becomes more complex
Solution Approach 1:
The water-absorbing sheet serves multiple functions: it absorbs liquid, supplies liquid to the sensor, and maintains a smooth surface feel on the user's body side. By making this single component multi-functional, the patent improves reliability without proportionally increasing device complexity.
Solution Approach 2:
The patent combines the water-absorbing sheet with the existing diaper sensor structure, integrating liquid absorption and supply functions into a unified component system. This merging approach enhances reliability while minimizing the increase in overall structural complexity.
3Speed
If a highly water-permeable sheet is used on the user's body surface side, then liquid can reach the sensor quickly, but the surface may not feel smooth to the user
Solution Approach 1:
The patent divides the diaper sensor into distinct functional layers: a highly water-permeable sheet for rapid liquid penetration, a water-absorbing sheet for liquid absorption and smoothing, and a wetness detection sensor device for detection. This segmentation allows each layer to optimize its specific function, achieving fast liquid speed while maintaining smooth surface feel that prevents user discomfort.
Solution Approach 2:
The water-absorbing sheet acts as an intermediary layer between the highly water-permeable sheet and the user's skin. It absorbs excess liquid quickly and presents a smooth surface to the user, thereby maintaining fast liquid penetration speed while eliminating surface roughness that would cause discomfort.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for more accurate and reliable detection of liquid presence on the diaper, reducing user discomfort and improving the detection of urine leakage, while maintaining a smooth surface feel.
Implementation Method 1
a highly water-permeable sheet forming a surface of the diaper sensor arranged on a user's body surface side
Implementation Method 2
a first water-absorbing sheet interposed between the highly water-permeable sheet and the wetness detection sensor device
Data Source
AI summary
Provided is a paper diaper having a structure capable of more reliably sensing a state of a diaper sensor being soaked in liquid. A diaper sensor 100 includes a sheet-shaped wetness detection sensor device 90 having a circuit 60 breakable or damageable when getting wet with liquid. The diaper sensor 100 includes a highly water-permeable sheet 85 forming the surface of the diaper sensor 100 arranged on a user's body surface side, and at least any one of a first water-absorbing sheet 81 interposed between the highly water-permeable sheet 85 and the wetness detection sensor device 90 or a second water-absorbing sheet 83 arranged on the opposite side of the wetness detection sensor device 90 from the highly water-permeable sheet 85 side.