Single-Magnet Joystick Sensing to Prevent Stick Drift
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Solution Overview
Problem
Existing joysticks suffer from wear and tear due to friction, complexity from multiple moving parts, and the 'stick drift' issue, particularly in gaming controllers, which are not effectively addressed by resistive or magnetic/Hall effect units.
Innovation Solution
A joystick design utilizing a single magnet and magnetic field sensors, combined with a force sensing mechanism and a spring mechanism to return the lever to zero position, and integrated with inductive or capacitive sensing to detect user input, minimizing moving parts and reducing stick drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistive rheostat mechanism or magnetic/Hall effect units are used, then measurement capability is provided, but device complexity and number of moving parts increases
Solution Approach 1:
The patent combines multiple sensing functions (X-axis detection, Y-axis detection, and pressure sensing) into a single integrated sensor unit. The force sensing mechanism integrates with the switch structure, allowing the same component to detect both positional changes and pressure applied by the user, thereby reducing the total number of moving parts while maintaining measurement precision.
Solution Approach 2:
The force sensing mechanism serves multiple functions: it detects the position of the force lever, determines user contact with the lever, and triggers switch events when pressure thresholds are exceeded. This multi-functional approach eliminates the need for separate sensors for each function, reducing device complexity.
2Measurement precision
If resistive rheostat mechanism is used, then position measurement is achieved, but wear and tear due to friction occurs
Solution Approach 1:
The patent replaces the mechanical contact-based resistive rheostat mechanism with a magnetic field-based sensing system. The magnetic field sensors detect the position of the magnet attached to the force lever without requiring physical contact or sliding components, thereby eliminating friction and wear while maintaining position measurement precision.
Solution Approach 2:
The patent introduces a magnet as an intermediary element that carries positional information through its magnetic field. Instead of direct mechanical contact between sensing components, the magnet serves as a mediator that allows the force lever's position to be detected magnetically, eliminating wear and tear.
3Measurement precision
If magnetic/Hall effect units are used for each axis, then position detection is improved, but cost and complexity increases
Solution Approach 1:
The patent merges the functionality of multiple Hall effect sensors into a single force sensing mechanism that detects both X and Y axis positions along with pressure. By using one integrated sensor instead of separate sensors for each axis, the system achieves the same measurement precision while reducing complexity and cost.
Solution Approach 2:
The force sensing mechanism is designed to perform multiple sensing functions simultaneously - detecting position in two dimensions and pressure magnitude - replacing what would traditionally require multiple specialized sensors. This universal approach reduces system complexity while maintaining detection accuracy.
4Ease of operation
If resistive solutions are used, then basic joystick function is provided, but stick drift problem occurs due to inability to return to zero points
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the position of the force lever using magnetic field sensors. When the lever returns to its neutral position, the sensors detect this state and provide feedback to the control system, enabling automatic recalibration and elimination of stick drift. The spring mechanism also provides mechanical feedback to return the lever to its zero position.
Solution Approach 2:
The spring mechanism is pre-configured to exert a restoring force that continuously pushes the force lever back to its zero or near-zero position. This preliminary mechanical action ensures that the lever naturally returns to the correct neutral position, preventing drift before it occurs and 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
The solution provides accurate and reliable joystick operation with minimal components, capable of detecting user touch and pressure, and preventing stick drift through continuous recalibration, while being resistant to environmental conditions like gloves and liquids.
Implementation Method 1
magnetic field sensors which are used to determine the orientation of the magnet
Implementation Method 2
magnetic/Hall effect units for each axis
Implementation Method 3
A spring mechanism is used to return the force lever to its zero or near zero (or null/neutral) position
Implementation Method 4
The force sensing mechanism uses a flexible metallic piece that is positioned close to an inductive coil
Implementation Method 5
differential capacitive sensing is used as the force sensing mechanism
Data Source
AI summary
A joystick/thumb stick that uses a single central magnet to determine the position of a user activated lever, and which includes force sensing circuitry to provide additional information for calibration and switch selection purposes.