Sanitary washing device
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Solution Overview
Problem
Sanitary washing devices face challenges in accurately detecting users performing standing urination due to increased noise interference from external radio waves when sensitivity is heightened, leading to potential misdetctions and improper toilet operation.
Innovation Solution
The sanitary washing device employs a radio wave sensor with a fixed position and orientation, where the maximum directivity direction is adjusted to avoid noise by not radiating waves into a second region when the toilet seat is open, and is oriented upward when the seat is closed, reducing noise interference and enhancing user detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reception sensitivity of the radio wave sensor is increased to detect slight user movements, then the ability to detect users performing standing urination is improved, but noise from external radio waves and reflected waves increases causing misdetections
Solution Approach 1:
The patent applies dynamics by making the radio wave sensor movable between two positional states (first position and second position) corresponding to the open and closed states of the toilet seat. The sensor position changes dynamically with the seat state, allowing the system to optimize detection performance for each condition while managing noise interference appropriately.
Solution Approach 2:
The patent uses the toilet seat itself as an intermediary element that blocks radio waves. When the seat is closed, it blocks external radio waves from reaching the sensor, thereby reducing noise interference. This intermediary approach allows the sensor to operate with higher sensitivity without suffering from external noise contamination.
2Area of stationary object
If the radio wave sensor detects users in both first region and second region when seat is closed, then detection coverage is improved, but noise from external sources and reflected waves increases
Solution Approach 1:
The system dynamically adjusts the detection region based on the toilet seat state. When the seat is closed, the sensor detects users in both first and second regions. When the seat is open, the sensor position changes to detect users only in the first region. This dynamic adjustment allows the system to maximize detection coverage when noise is blocked and minimize noise exposure when the seat is open.
Solution Approach 2:
The closed toilet seat acts as an intermediary that blocks external radio waves, enabling the sensor to safely expand detection coverage to include both the first region (in front of the toilet) and the second region (above the toilet) without suffering from increased noise interference.
3Object-affected harmful factors
If the radio wave sensor position changes with toilet seat state, then noise interference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the radio wave sensor with the toilet seat structure, making the sensor an integrated component that moves together with the seat. This combination eliminates the need for separate positioning mechanisms and complex control systems, as the sensor position automatically changes with the seat state through mechanical coupling.
Solution Approach 2:
The system uses the natural movement of the toilet seat to automatically position the radio wave sensor in the appropriate detection region. The seat's own motion serves to adjust the sensor position, eliminating the need for external actuators or complex positioning mechanisms. The structure itself provides the positioning function.
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 effectively reduces noise-related misdetctions, allowing reliable user detection and proper toilet operation by minimizing external noise interference and optimizing wave propagation.
Implementation Method 1
a radio wave sensor (70) that uses a radio wave to detect a user in front of the main part (20)
Data Source
AI summary
According to one embodiment, a sanitary washing device includes a main part, a toilet seat, and a sensor. The toilet seat is supported to be rotatable. The sensor is provided in an interior of the main part and uses a radio wave to detect a user in front of the main part. A position of the sensor does not change. In a state in which the toilet seat is closed, the user in front of the main part is detected by the sensor in a first region and a second region higher than the first region. In a state in which the toilet seat is open, the user in front of the main part is detected by the sensor in the first region without the user in front of the main part being detected by the sensor in the second region.