3D Magnetic Knob Sensing for Unambiguous Multi-Position Detection
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Solution Overview
Problem
Current input devices, such as rotary knobs, require multiple sensing elements for complex movement detection, leading to increased costs and design complexity, necessitating a simpler and more cost-effective solution for unambiguous movement detection.
Innovation Solution
A single three-dimensional (3D) magnetic sensor is used to detect multidirectional movements of a rotary object by measuring and generating signals from three different magnetic field components, with a magnet configured to rotate within a magnetic field, allowing for inhomogeneous variation of the magnetic field components during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensing elements are used for complex movement detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sensing functions into a single 3D magnetic sensor that can detect rotational position, push movements, and tilt movements simultaneously. This single sensor replaces what would traditionally require multiple separate sensing elements, thereby reducing device complexity while maintaining the capability to detect all three types of movements with high precision
Solution Approach 2:
The 3D magnetic sensor serves multiple functions: detecting rotational angle, push displacement, and tilt angle. This multi-functional approach allows one sensor to perform the work of several specialized sensors, reducing overall system complexity while preserving measurement precision across all movement types
2Measurement precision
If multiple sensing elements are used for complex movement detection, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
By merging multiple sensing functions into a single 3D magnetic sensor, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation lowers manufacturing costs while maintaining the precision benefits of multiple detection capabilities through the sensor's three-dimensional measurement capacity
3Device complexity
If a single 3D magnetic sensor is used for position detection, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent utilizes the three-dimensional measurement capability of the single magnetic sensor to extract multiple position parameters (rotational angle, push displacement, tilt angle) from three-dimensional magnetic field component measurements. By leveraging the full three-dimensional measurement space, the single sensor achieves precision comparable to multiple sensors while reducing system complexity
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 solution enables unambiguous detection of rotational and spatial movements with reduced complexity and cost, effectively simplifying the detection of complex knob movements like rotation, push, and tilt, while maintaining high sensitivity to small displacements.
Implementation Method 1
a magnet that produces the magnetic field... The magnetic field varies inhomogeneously with regards to at least one of the three magnetic field components upon rotation of the magnet
Data Source
AI summary
A magnetic sensor device includes a three-dimensional (3D) magnetic sensor and a magnet that produces a magnetic field. The 3D magnetic sensor is arranged within the magnetic field and is configured to measure three different magnetic field components of the magnetic field and generate sensor signals in response to the measured three different magnetic field components. The magnet is arranged in a default spatial position in an absence of any applied spatial force, where the magnet is configured to rotate about a rotation axis based on an applied rotational force. The magnetic field varies inhomogeneously with regards to at least one of the three magnetic field components upon rotation of the magnet about the rotation axis.