Foldable Electronic Housing Angle Detection with Dual Sensors
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Solution Overview
Problem
Existing electronic devices face challenges in accurately calculating the open angle formed by rotating bodies due to noise integration and stress relaxation in piezoelectric sensors, leading to inaccurate angle detection over time.
Innovation Solution
The electronic device employs a first sensor to indicate a reference angle and a second sensor to measure angular changes, along with a control unit that calculates the open angle based on these signals, using a flexible coupling member with a non-fixing part to deform and provide a reference for accurate angle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a piezoelectric sensor is used to detect angle changes in a foldable housing, then the sensor can output a signal indicating angular velocity, but noise and stress relaxation cause cumulative errors that reduce measurement precision over time
Solution Approach 1:
The system uses feedback by continuously monitoring the relationship between the first and second bodies through multiple sensors (first sensor detecting reference angle, second sensor detecting angular velocity) and adjusting the integrated angle calculation based on this feedback to compensate for cumulative errors from noise and stress relaxation
Solution Approach 2:
The invention changes the parameter approach by using two different sensing methods: one based on reference angle detection (first sensor) and another based on angular velocity integration (second sensor), combining their outputs to achieve more reliable angle measurement that compensates for the limitations of each individual method
2Adaptability or versatility
If the housing is made foldable with curved pressing sensors, then the device achieves adaptability for different configurations, but the piezoelectric film deformation introduces measurement errors
Solution Approach 1:
The system segments the angle detection function into two independent sensor systems: the first sensor (piezoelectric) embedded in the flexible coupling member that detects reference angle, and the second sensor that detects angular velocity, allowing each to operate optimally in their respective roles while maintaining foldable adaptability
Solution Approach 2:
The flexible coupling member acts as an intermediary element that connects the first and second bodies while accommodating the foldable motion. It embeds the first sensor within its structure, allowing the sensor to detect angle changes through the coupling member's deformation without being directly subjected to the stress of folding, thus maintaining measurement precision
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 precise calculation of the open angle by correcting for noise and stress-related errors, ensuring accurate detection of the angle formed by the rotating bodies.
Implementation Method 1
the pressing sensor includes a piezoelectric film that deforms to stretch when the housing is folded. This folding causes the pressing sensor to output a signal having a voltage corresponding to the stretching amount of the piezoelectric film
Data Source
AI summary
An electronic device is provided that includes a first body, a second body having a structure that rotates with respect to the first body about a central axis, a first sensor that outputs a first detection signal having a first output value indicating that an open angle formed by the first body and the second body is a reference angle, a second sensor that outputs a second detection signal having a second output value that changes under an influence of a change in the open angle, and a control unit that calculates the open angle based on the first detection signal and the second detection signal.