Fluid-Driven Soft Actuators for High-Resolution Haptic Feedback
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Solution Overview
Problem
Traditional shape displays for augmented and virtual reality systems, such as pin-array haptic gloves, face limitations in haptic resolution due to pin spacing and positioning, and are often bulky with mechanical components prone to locking, restricting the range of sensations that can be produced.
Innovation Solution
The use of fluid-driven actuator chambers with flexible material layers that change volume to distort and exert forces on a contact surface, allowing for more complex movements and higher haptic resolution, including three-dimensional freedom and rotational forces, without the bulk of traditional mechanical systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pin-array shape displays are used, then haptic feedback can be provided, but haptic resolution is limited by pin spacing and positioning
Solution Approach 1:
The patent replaces traditional mechanical pin-array actuators with soft robotic actuators that use compliant materials and pneumatic or hydraulic actuation. This substitution eliminates the rigid pin structures that constrain haptic resolution through fixed spacing, allowing for continuous variable haptic feedback across the contact surface without mechanical positioning limitations.
Solution Approach 2:
The patent changes the actuation mechanism from discrete mechanical pin movement to continuous soft material deformation controlled by fluid pressure. By varying the pressure parameters in the pneumatic or hydraulic system, the soft actuators can produce a continuous range of haptic sensations with high resolution,不受限于固定的针间距.
2Reliability
If traditional mechanical shape displays are used, then tactile information can be conveyed, but the devices are bulky and incorporate mechanical components vulnerable to locking
Solution Approach 1:
The patent replaces vulnerable mechanical components with soft robotic actuators that use compliant materials and fluid pressure for actuation. This eliminates gears, linkages, and other mechanical parts that are prone to locking and failure, resulting in a more reliable system with fewer moving parts that can jam or wear out.
Solution Approach 2:
The patent employs soft actuators constructed from flexible materials such as elastomers that deform under pneumatic or hydraulic pressure. These flexible structures replace rigid mechanical components, providing smooth motion without the risk of mechanical locking, and allowing the device to be more compact and reliable.
3Adaptability or versatility
If pin-array shape displays with fixed pins are used, then haptic feedback is provided, but the range of sensations is limited to normal-angle pressure
Solution Approach 1:
The patent employs dynamically deformable soft actuators that can change their shape and orientation in response to fluid pressure variations. Unlike fixed pins that can only move perpendicular to the surface, these soft actuators can produce multi-directional forces and complex deformation patterns, enabling a versatile range of tactile sensations including lateral forces, vibration, and rotational cues.
Solution Approach 2:
The patent transitions from one-dimensional pin displacement (normal to surface) to multi-dimensional soft actuator deformation. The soft actuators can expand, contract, bend, and twist in multiple directions, adding dimensional complexity to the haptic feedback and enabling a broader range of tactile sensations beyond simple normal-pressure contact.
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 solution enhances haptic feedback capabilities by providing a more nuanced and versatile range of tactile sensations, reducing the risk of mechanical locking and enabling smaller, more efficient designs for haptic feedback systems.
Implementation Method 1
Each actuator chamber may include a flexible material layer that is configured to contain a volume of fluid such that changing the volume of fluid contained within the actuator chamber causes the actuator chamber to distort at least along an actuation axis
Implementation Method 2
distortion of the actuator chambers causes the actuator chambers to exert forces on the contact surface, thereby causing movement of the contact surface
Data Source
AI summary
An actuation apparatus may be configured to apply forces to a user's skin using flexible-membrane actuators. Such an apparatus may include (i) an array of actuator chambers that include a flexible material layer enclosing a changeable volume of fluid, (ii) a contact surface that is coupled to each actuator chamber, and (iii) a support framework that is coupled to the actuator chambers such that the array of actuator chambers is disposed between the support framework and the contact surface, and such that distortion of actuator chambers caused by changing the volume of fluid within the actuator chambers causes the array of actuator chambers to exert forces on the contact surface and cause movement of the contact surface.