Differential Optical Position Sensing for Haptic Actuation
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Solution Overview
Problem
Existing haptic feedback systems require expensive actuators and complex control systems to achieve sharp haptic feedback, necessitating a more cost-effective and efficient solution.
Innovation Solution
A system utilizing differential optical position sensing with two optical sensors and a differential circuit to cancel ambient noise, allowing for precise control of haptic actuators through a processor-driven control signal, enabling crisp and efficient haptic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive actuators and complex control systems are used, then sharp haptic feedback is achieved, but hardware cost increases
Solution Approach 1:
The system divides the sensing function into two separate optical sensors instead of using one complex sensor, allowing each sensor to be simpler and cheaper while collectively providing precise position measurement through differential signaling
Solution Approach 2:
The patent replaces expensive mechanical position sensors with optical sensors that use light to detect actuator position, eliminating complex mechanical components while achieving high measurement precision for sharp haptic feedback
2Measurement precision
If complex control systems are used, then sharp haptic feedback is achieved, but device complexity increases
Solution Approach 1:
The system implements a feedback control loop where the differential circuit continuously monitors the actuator position and feeds this information back to the processor, which adjusts the drive signal in real-time to achieve precise haptic effects with simpler control logic
Solution Approach 2:
The differential circuit acts as an intermediary that simplifies the control system by automatically canceling ambient noise and providing a clean position signal to the processor, reducing the complexity of noise filtering and signal processing required in the control algorithm
3Measurement precision
If ambient noise is present, then sensor accuracy decreases, but using differential sensing increases hardware complexity
Solution Approach 1:
The patent applies differential sensing specifically to the position measurement function, making the noise cancellation capability localized to where it is most needed (the position sensing path) rather than throughout the entire system, minimizing unnecessary 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 approach reduces hardware costs while enhancing haptic feedback resolution and user satisfaction by allowing faster actuator acceleration and deceleration, achieving crisp haptic effects with lower cost components.
Implementation Method 1
a first sensor configured to monitor a position of the object and output a first position signal; a second sensor configured to monitor the position of the object and output a second position signal
Implementation Method 2
a circuit configured to receive the first position signal and the second position signal and output a difference signal
Data Source
AI summary
Systems and methods for differential optical position sensing for a haptic actuator are disclosed. In one embodiment, a system includes: an actuator configured to receive a drive signal and move an object to output a haptic effect; a first sensor configured to monitor a position of the object and output a first position signal; a second sensor configured to monitor the position of the object and output a second position signal different from the first position signal; a circuit configured to receive the first position signal and the second position signal and output a difference signal; and a processor configured to receive the difference signal and output a control signal to the actuator based on the difference signal.