Tactile Feedback Wheel Converts Ultrasonic Distance to Position
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Solution Overview
Problem
Conventional assistive devices for the blind, such as canes and vibration-based systems, are cumbersome and lack precision in providing environmental range distance information, failing to offer effective edge parameter detection and object composition identification.
Innovation Solution
The Environmental Navigation Aid (ENA) employs a non-contact ultrasonic range finder and a variable-location tactile feedback unit with multiple teethed wheels to convey distance and surface information through precise tactile feedback, allowing users to interpret object characteristics by feeling the movement of the tactile feedback unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If vibration systems are used to convey environmental ranging information, then the user can receive feedback about objects, but the feedback lacks sense of absolute position and becomes numbing to the user's skin
Solution Approach 1:
The patent replaces conventional vibration-based mechanical feedback systems with a tactile feedback wheel that provides positional information through mechanical contact. The wheel's position and movement along the device body convey absolute position information and surface characteristics, eliminating the numbing effect of continuous vibration while maintaining comprehensive environmental feedback.
Solution Approach 2:
The tactile feedback wheel acts as an intermediary between the ultrasonic range finder's digital measurements and the user's tactile perception. It translates distance data and surface characteristics into physical position and texture information that the user can perceive through touch, bridging the gap between electronic sensing and human perception.
2Loss of information
If a physical cane is used for scanning objects, then the user can detect objects in the environment, but the scanning process becomes slow and cumbersome
Solution Approach 1:
The patent replaces the mechanical scanning motion of a physical cane with non-contact ultrasonic detection. The ultrasonic range finder electronically measures distance to objects without physical contact, enabling rapid scanning without the cumbersome hand movements required for traditional canes, thus significantly improving scanning productivity.
Solution Approach 2:
The system creates a digital copy of the environmental map through ultrasonic measurements, storing distance information in memory. This digital representation allows the user to navigate using electronic data rather than continuous physical scanning, enabling faster navigation decisions and improving overall productivity.
3Productivity
If non-contact ranging is used, then the detection speed improves, but the feedback system lacks precision in conveying distance information
Solution Approach 1:
The tactile feedback wheel serves as an intermediary that translates digital distance measurements into precise tactile position information. By mechanically positioning the wheel at distances proportional to the measured range, the system maintains both the speed of non-contact detection and the precision of tactile feedback, allowing users to accurately perceive distance through touch.
Solution Approach 2:
The system changes the feedback parameter from vibration frequency to physical position. Instead of using vibration intensity to convey distance (which lacks precision), the wheel's position along the device body provides a direct, proportional tactile representation of distance, achieving both speed and precision in distance communication.
4Duration of action of stationary object
If vibration feedback is used for long periods, then the user can continuously receive environmental information, but the user's skin becomes numbing
Solution Approach 1:
The patent substitutes continuous vibration feedback with a mechanical wheel system that provides information through positional cues. The wheel remains stationary or moves to specific positions to convey distance and surface information, eliminating the continuous skin stimulation that causes numbing while maintaining the ability to provide continuous environmental feedback through discrete tactile cues.
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
ENA provides accurate and long-term usable feedback on distance, solidity, and complexity of objects, enhancing navigation and object identification for the blind by translating ultrasonic data into intuitive tactile cues, reducing user fatigue and improving navigation efficiency.
Implementation Method 1
The range finding unit can use ultrasound to measure the distance between the object and the ENA
Implementation Method 2
The range finding unit can include a speaker and at least one microphone
Data Source
AI summary
An Environmental Navigation Aid is provided, and can be a rechargeable, portable, handheld device that can convert environmental information, such as distance to a target object, into tactile values for presentation to a user's palm or fingers by way of a tactile feedback wheel. The nature of the target object composition can be factored into the behavior of the feedback wheel. The Environmental Navigation Aid can be paired with a wireless charging dock that can also serve as a homing beacon when the handheld device is pointed at the changing dock. Stand-alone homing beacons for additional orientation referencing tasks can be added to an Environmental Navigation Aid as a system. The Environmental Navigation Aid is designed to assist the blind in perception of the world around them.