Tactile Environment Sensor for Visually Impaired Users
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Solution Overview
Problem
Existing devices for visually impaired individuals fail to provide meaningful information about detected objects, often struggling to distinguish between different objects and convey detailed information, leading to safety hazards, especially in environments where visual or auditory cues are limited.
Innovation Solution
A handheld, lightweight device using a combination of sensors and actuators to create a virtual tactile representation of the environment, allowing users to 'feel' objects through mechanical movements and thermal changes, capable of detecting distance, texture, temperature, and optical spectrum values, and functioning in various environments, including underwater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If acoustic signals or visual screens are used to convey information, then the device can communicate detected objects, but the information provided is either too narrow (acoustic warnings only) or unusable by visually impaired persons (visual screens)
Solution Approach 1:
The patent replaces visual and acoustic output mechanisms with tactile mechanical feedback. A matrix of pins can extend or retract to create tactile patterns on the user's skin, substituting the inadequate acoustic warnings and unusable visual screens with a tactile interface that visually impaired persons can actually perceive and interpret to gain comprehensive object information.
Solution Approach 2:
The patent uses variations in tactile stimulus intensity, duration, and pattern (analogous to color changes in visual systems) to encode different object properties. Different tactile patterns represent different object characteristics, allowing rich information communication through a single tactile channel without requiring visual or acoustic modalities.
2Reliability
If conventional sensors are used, then objects can be detected, but difficult-to-detect objects like chain link fences or glass walls remain undetected
Solution Approach 1:
The patent employs multiple sensing modalities (acoustic, optical, tactile, thermal) within a single device to detect diverse object types. This multi-functional approach ensures that objects difficult to detect with conventional single-modality sensors—such as transparent glass walls or complex chain link fences—can be detected through alternative sensory channels, improving overall detection reliability.
Solution Approach 2:
The patent introduces intermediate detection methods for challenging objects. For example, acoustic waves can detect glass walls by sensing vibrations or reflections that optical sensors miss, while thermal sensors can detect body heat through transparent barriers. These intermediary sensing methods bridge the gap where conventional direct detection fails.
3Loss of information
If detailed object information is provided, then visually impaired persons gain meaningful information, but the device complexity increases
Solution Approach 1:
The patent segments the information delivery function into a matrix of independently controllable pins. Each pin can be individually actuated to represent specific object attributes, allowing detailed information to be communicated through simple, discrete mechanical elements rather than complex integrated systems. This segmentation enables rich information output while maintaining mechanical simplicity.
Solution Approach 2:
The patent creates tactile copies or representations of visual information. The pin matrix generates tactile patterns that replicate the spatial and property information that would otherwise require visual display, allowing visually impaired users to perceive detailed object characteristics through touch rather than sight, thereby reducing the need for complex visual processing systems.
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 visually impaired users to accurately perceive their surroundings by simulating touch, providing detailed information about objects and environments, enhancing safety and independence by allowing for precise object recognition and navigation without physical contact.
Implementation Method 1
transmit electromagnetic radiation to detect objects and measure distance, temperature, and optical spectrum values
Implementation Method 2
piezoelectric transducers in the handle convert tactile element movements into electrical signals
Data Source
AI summary
The present invention relates generally to the field of virtual tactile sensing, specifically to the field of virtual extension of the senses of the fingertips. Specifically, the present invention is the tactile transfer of environment information to the fingertips of the operator in the form of a line. The present invention senses information regarding distance, thermal values and optical spectrum values and conveys this information to the operator by means of mechanical movements and/or thermal changes of the actuators. These actuators are the equivalent of placing the operator's fingertips on the object. The device as a whole acts as an extension of the hand that senses information by placing virtual fingertips on an object and conveys that information to the operator's fingertips.