Switchable Keyboard With Shape Memory Alloy Keys for Braille
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Solution Overview
Problem
Conventional keyboards require calibration for vision-impaired users to position their hands correctly for braille input, as hand and finger positions vary among individuals, leading to inconsistent key placement and potential accidental activation.
Innovation Solution
A keyboard with adjustable height keys that can toggle between standard and braille configurations, using shape memory alloys or other actuators to extend specific keys above the keyboard plane, allowing for tactile location without calibration and preventing accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a standard keyboard is used with fixed key heights, then the keyboard structure is simple and manufacturing is easy, but vision-impaired users cannot easily locate keys without calibration
Solution Approach 1:
The keyboard implements dynamic key height adjustment where selected keys can be raised above the standard keyboard plane to form a braille interface. This allows the keyboard to adapt its configuration based on user needs, transforming from a static fixed-height keyboard to a dynamic adjustable-height keyboard that provides tactile cues for vision-impaired users without requiring calibration.
Solution Approach 2:
The invention adds a vertical dimension to the keyboard interface by raising specific keys above the standard plane. This creates a three-dimensional tactile surface where the height difference between raised and flat keys provides tactile information, enabling braille input without requiring users to calibrate their hand positions on a two-dimensional flat surface.
2Ease of operation
If all keys are activated on a standard keyboard, then full keyboard functionality is available, but accidental activation occurs more frequently for vision-impaired users
Solution Approach 1:
The keyboard functionality is segmented into two distinct modes: standard keyboard mode where all keys are active, and braille mode where only the raised keys are active. This segmentation allows the system to prevent accidental activation by disabling irrelevant keys in braille mode while maintaining full functionality in standard mode, thus resolving the contradiction between preventing accidental input and preserving versatility.
Solution Approach 2:
Different regions of the keyboard have different functional qualities depending on the mode. In braille mode, only the raised keys (forming the braille matrix) have input functionality, while other keys are disabled. This local differentiation of functional quality prevents accidental activation of non-braille keys while maintaining the ability to access full keyboard functionality when needed.
3Measurement precision
If calibration is required for hand positioning, then key placement can be precise, but the process is time-consuming and complex
Solution Approach 1:
The keyboard pre-configures the braille interface by raising specific keys to predetermined positions that form a standard braille matrix layout. This preliminary arrangement of keys eliminates the need for users to perform calibration procedures to locate their home positions, as the raised keys provide inherent tactile reference points that guide proper hand placement immediately upon 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
Enables vision-impaired users to easily locate and use a braille interface on a standard keyboard without calibration, enhancing usability and reducing accidental key activation.
Implementation Method 1
A keyboard with adjustable height keys that can toggle between standard and braille configurations, using shape memory alloys or other actuators to extend specific keys above the keyboard plane
Data Source
AI summary
Keyboards that are selectably configurable between a standard interface and a braille interface. In embodiments, the keyboard is equipped with six keys corresponding to six dots of a braille matrix, each of the keys equipped with a shape memory alloy spring or other mechanism to cause each of the keys to selectably extend above the keyboard plane. On activation, the six keys are extended and the remaining keys deactivated, to provide an easy to locate braille interface. On subsequent activation, the six keys are retracted and the keyboard is reverted to a standard interface. Other embodiments may be described and/or claimed.