Magnetic Sensing Interface for Precise Actuator Position Detection
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Solution Overview
Problem
Existing user interface devices relying on mechanical or optical components for motion detection are limited in interpreting position and motion accurately, particularly when it comes to magnetic sensing technologies.
Innovation Solution
A user interface device incorporating an electromagnetic dipole array and a magnetic sensor element to generate and sense magnetic fields, allowing for precise determination of position and motion through a control circuit and processing of magnetic sensor output data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical or optical components are used for motion detection, then the device structure is simple and easy to manufacture, but the measurement precision of position and motion is limited
Solution Approach 1:
The patent replaces mechanical motion detection components with an electromagnetic field-based detection system. A magnetic sensor detects the position of a magnet attached to the actuator element, eliminating the need for complex mechanical encoders or optical sensors. This substitution maintains structural simplicity while significantly improving measurement precision for position and motion detection.
Solution Approach 2:
The magnetic field detection system serves multiple functions: it detects both position and motion of the actuator element, and can potentially detect orientation. This multi-functionality is achieved through a single magnetic sensor and magnet combination, reducing overall device complexity while improving measurement capabilities across multiple parameters.
2Measurement precision
If magnetic sensing components are used to improve position interpretation, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The patent extracts the position detection function from complex mechanical or optical systems and isolates it into a simple magnetic field sensing subsystem. By using a magnet attached to the actuator and a separate magnetic sensor, the system separates the sensing function from the actuation mechanism, improving position interpretation accuracy while keeping the overall system simple and modular.
3Measurement precision
If electromagnetic dipole array is used for magnetic field generation, then the measurement precision and control accuracy improve, but the use of energy increases
Solution Approach 1:
The electromagnetic dipole array operates by periodically energizing different dipole elements rather than maintaining continuous operation. The control circuit selectively activates specific dipoles based on the detected position of the actuator element, creating a periodic or intermittent operation pattern. This approach maintains high measurement precision for actuator position determination while significantly reducing overall energy consumption compared to continuous operation.
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
Enhances the accuracy and effectiveness of interpreting position and motion in user interface devices by leveraging magnetic sensing, providing a more reliable and efficient method for user interaction with electronic devices.
Implementation Method 1
an electromagnetic dipole array having a plurality of dipole elements for generating magnetic fields
Implementation Method 2
a magnetic sensor element associated with the dipole array. The magnetic sensor element may be configured to sense the magnetic fields at a position of the actuator element
Data Source
AI summary
User interface devices with electromagnetic dipole arrays and associated magnetic sensors, control circuits, and processing elements for determining user actuation of the device are disclosed. In one embodiment a user interface device includes an electromagnetic dipole array coupled to an actuator, along with a three-axis magnetic sensor and control and processing elements for controlling driving currents to the dipole array and sensing and processing received magnetic field signals to determine movement or displacement of the actuator.