Handheld Controller Two-Stage Trigger for Precise Force Sensing
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Solution Overview
Problem
Existing artificial reality systems lack the ability to facilitate fine motor actions, such as precise manipulation of virtual objects using the index finger, due to limited tactile feedback and synchronization of hand movements.
Innovation Solution
A controller with a two-stage trigger mechanism that includes a magnet and magnetic sensor to measure the force applied by the index finger, transitioning from constant to linearly increasing resistance, allowing for precise haptic feedback and virtual interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single-stage trigger mechanism is used, then the device structure is simple, but the measurement precision of force applied by the index finger is insufficient
Solution Approach 1:
The trigger mechanism is divided into two distinct stages: a first stage with constant resistance and a second stage with linearly increasing resistance. Each stage is associated with different inflection thresholds (first and second inflection thresholds), allowing the system to measure force with higher precision across different force ranges by segmenting the measurement into distinct operational zones.
Solution Approach 2:
The trigger mechanism transitions from a static, single-stage design to a dynamic, two-stage design where the resistance characteristics change based on the stage. The system dynamically adjusts the resistance profile (constant vs. linearly increasing) and switches between different inflection thresholds based on the applied force, enabling adaptive measurement that improves precision without requiring an overly complex fixed structure.
2Ease of operation
If no haptic feedback is provided, then the device is simpler, but the tactile feedback for fine motor actions is insufficient
Solution Approach 1:
The system implements haptic feedback that responds to the user's trigger input in real-time. Based on the detected force and stage transitions (identified through inflection thresholds), the system provides appropriate haptic responses to guide fine motor actions. This feedback loop enhances the user's ability to perform precise manipulations by providing tactile information about the force applied and the system's response.
3Measurement precision
If a two-stage trigger mechanism with inflection thresholds is implemented, then the measurement precision of force is improved, but the device complexity increases
Solution Approach 1:
The measurement range is segmented into two distinct stages, each with its own resistance characteristics and inflection threshold. The first stage handles lower force values with constant resistance, while the second stage handles higher force values with linearly increasing resistance. This segmentation allows each stage to be optimized for its specific force range, improving overall measurement precision without requiring a single overly complex mechanism.
Solution Approach 2:
The switch assembly acts as an intermediary component that detects the transition between stages by monitoring the inflection thresholds. Rather than requiring the entire trigger mechanism to be complex, the switch assembly serves as a dedicated mediator that identifies stage transitions and communicates this information to the control system, simplifying the overall design while maintaining 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
Enables precise manipulation of virtual objects by simulating realistic gripping experiences, enhancing the realism and precision of interactions in virtual environments.
Implementation Method 1
The trigger can include a magnet and magnetic sensor
Data Source
AI summary
A controller includes a housing, and a handle extends from a portion of the housing. The housing defines an internal cavity. The housing includes a thumb plate, wherein the thumb plate comprises a touchpad, one or more actuators, and/or a joystick. The one or more actuators comprise buttons. The controller includes a logic board including a processor oriented in the internal cavity. The controller comprises a switch assembly oriented in the internal cavity and configured to engage the logic board. The handle comprises at least one trigger oriented for movement into the internal cavity. The trigger can include a magnet and magnetic sensor.