Ball-Based Haptic Actuator for Touchscreen Force Feedback
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Solution Overview
Problem
Haptic devices typically provide limited tactile feedback, often relying on vibrations or passive reactions, which do not effectively simulate real-world interactions, especially in complex environments like touchscreens.
Innovation Solution
A haptic device with a ball-based actuation mechanical structure driven by two motors and a gyroscope, allowing for two degrees of freedom active force feedback by rotating the ball against a surface to apply motive force based on position, providing frictional resistance and proactive feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If haptic devices use vibratory or passive reactive mechanisms, then the device structure can be simple, but the tactile feedback realism is insufficient
Solution Approach 1:
The patent replaces traditional vibratory haptic mechanisms with a robotic manipulation system that uses computer vision and active mechanical control. The robotic arm with gripper provides proactive, adaptive haptic feedback by dynamically adjusting its interaction forces based on visual feedback and control algorithms, rather than relying on passive mechanical vibration mechanisms.
Solution Approach 2:
The system implements a closed-loop feedback mechanism where computer vision continuously monitors the interaction between the robotic gripper and the object, and this visual information is used to dynamically adjust the haptic forces applied. The feedback loop enables the system to adapt its mechanical response in real-time, providing realistic tactile feedback that reacts naturally to user actions.
2Reliability
If haptic devices provide proactive force feedback with multiple degrees of freedom, then the tactile feedback realism improves, but the device complexity increases
Solution Approach 1:
The haptic device is segmented into distinct functional modules: a robotic arm for positioning, a gripper for object interaction, computer vision sensors for monitoring, and independent control systems for each degree of freedom. This modular segmentation allows complex six-degree-of-freedom haptic feedback to be achieved through coordinated simple modules rather than a monolithic complex mechanism.
Solution Approach 2:
The robotic manipulation system serves multiple functions: it provides haptic feedback through controlled resistance forces, it enables precise positioning through the robotic arm, it captures interaction data through computer vision, and it adapts to different objects and tasks. This multi-functionality consolidates what would otherwise require separate specialized mechanisms into a single versatile platform.
3Ease of manufacture
If haptic devices use passive reactive mechanisms, then the ease of manufacture is high, but the ability to provide realistic frictional resistance is limited
Solution Approach 1:
The system transitions from static passive haptic mechanisms to dynamic active control. The robotic gripper and arm can dynamically adjust their stiffness, damping, and force output in real-time based on the interaction context. This dynamic capability enables realistic frictional resistance that adapts to different objects, speeds, and interaction types, something impossible with fixed passive mechanical structures.
Solution Approach 2:
The patent replaces traditional mechanical friction-based haptic mechanisms with an actively controlled robotic system. Instead of relying on fixed mechanical friction surfaces, the system uses controlled motor forces and computer vision feedback to synthesize realistic frictional resistance, achieving superior haptic realism while maintaining manufacturing simplicity through modular robotic components.
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 realistic and engaging haptic feedback, allowing users to feel resistance and proactive motion, enhancing interaction with touchscreens and other surfaces, suitable for various applications including gaming, education, and accessibility for visually impaired users.
Implementation Method 1
The haptic device includes a gyroscope
Implementation Method 2
The actuation mechanical structure includes a first motor and an associated first drive train in communication with the ball for rotating the ball about a x-axis and a second motor and an associated second drive train in communication with the ball for rotating the ball about a y-axis
Implementation Method 3
rotation of the ball against the surface applying motive force to the haptic device, wherein the motive force provides feedback
Data Source
AI summary
Methods, systems, and apparatuses, including computer programs encoded on computer-readable media, provide two degrees of freedom active force feedback for touchscreens or any other general surface. The system includes a rubber ball attached to a pen-like structure with two motors that are capable of rotating freely when external force is applied. The system has also a mechanical structural arrangement including gears and cables to transfer motor power to engage the rubber ball. The system further includes a digital compass to measure the device tilt, along with a processing unit to control the system and a wireless communication module and a power module.