Inductive Flip Position Detection for Mobile Devices
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Solution Overview
Problem
Conventional flip position detection methods in mobile devices, such as mechanical switches and hall effect sensor systems, are inadequate due to space constraints and reliability issues, making it difficult to design smaller, aesthetically pleasing devices.
Innovation Solution
Implementing a hinge system with an inductance sensor that uses a metal plate and inductor to detect open and closed positions through changes in inductance, allowing for multi-position determination and efficient flip position detection in a compact form factor, along with capacitive and resistive sensing alternatives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical switches are used to detect flip position, then flip position detection is achieved, but the device becomes bulky and aesthetically compromised
Solution Approach 1:
The patent replaces mechanical switches with inductive sensing technology. An inductor generates a magnetic field that interacts with a metal plate on the hinge, detecting flip position through changes in inductance rather than mechanical contact. This substitution eliminates the need for bulky mechanical components while maintaining detection reliability.
Solution Approach 2:
The patent detects flip position by monitoring changes in inductance parameter. As the hinge moves between open and closed positions, the distance between the inductor and metal plate changes, causing measurable variations in inductance. This parameter-based detection enables compact design without sacrificing detection accuracy.
2Measurement precision
If hall effect sensor and magnet systems are used to detect flip position, then proximity detection is achieved, but too much physical space is taken up in the housing
Solution Approach 1:
The patent replaces hall effect sensor and magnet systems with an inductive sensing system. Instead of using magnets and hall effect sensors that require significant spacing to detect magnetic field strength changes, the patent uses an inductor and metal plate configuration that achieves comparable detection precision in a more compact arrangement.
Solution Approach 2:
The inductor serves multiple functions: it generates the magnetic field for sensing, acts as part of the sensing circuit, and can be integrated into the existing hinge structure. This multi-functionality reduces the overall space required compared to dedicated magnet and sensor assemblies.
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
Enables smaller device designs by efficiently detecting flip positions with reduced space requirements, improving reliability and aesthetics by eliminating bulky components.
Implementation Method 1
an inductor and a metal plate, both of which rotate along with the hinge as it operates to open and close the device housing of the mobile device. The metal plate remains approximately parallel with the inductor
Data Source
AI summary
In aspects of flip position detection, a mobile device has a device housing with a base section and a flip section that folds onto the base section. The mobile device has a hinge that operates between open and closed positions of the device, and the flip section of the device housing operates to open relative to the base section of the device housing. An inductor is positioned in the device housing to have an inductance as the hinge operates to open and close the device housing. A metal plate is coupled to the hinge in a configuration that translates the metal plate relative to the inductor as the hinge operates between the open and closed positions. A sensor is implemented to detect the inductance between the inductor and the metal plate, where inductance values indicate the closed and open positions of the device housing.