Passive Magnetic Trackball Input for Low-Power Reliable Sensing
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Solution Overview
Problem
Existing user input devices for computing systems often require power, leading to mechanical or electrical failures and increased user fatigue due to their weight and load, reducing portability and usability.
Innovation Solution
A human interface device using a track ball with a pair of magnets mechanically coupled to encode movement in a magnetic field distribution, sensed by an unpowered sensing system, allowing for passive input without the need for power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing user input devices are used, then user input detection is achieved, but power consumption increases and mechanical/electrical failures occur
Solution Approach 1:
The patent replaces powered mechanical sensing systems with a passive magnetic field-based sensing mechanism. Magnets attached to the trackball interact with magnetic sensors on the surface, eliminating the need for powered components in the input device itself while maintaining reliable input detection functionality
Solution Approach 2:
The trackball device generates its own magnetic field signature through the movement of attached magnets, requiring no external power source or active electronic components. The system serves itself by using the physical movement of magnets to encode input data that is passively detected by the sensing surface
2Ease of operation
If powered input devices are used, then input detection capability is improved, but device weight increases and user fatigue occurs
Solution Approach 1:
The patent eliminates motors, batteries, and powered electronic components by substituting them with a passive magnetic encoding system. The trackball uses magnets that passively generate magnetic field patterns during movement, dramatically reducing device weight while preserving full input detection capability
Solution Approach 2:
The patent extracts and removes all power-consuming components from the input device. The functional capability of detecting user input is separated from the need for power sources, placing the sensing functionality entirely in the surface system while the input device becomes a passive magnetic encoder
3Measurement precision
If more components are added to improve sensing accuracy, then measurement precision increases, but device complexity increases
Solution Approach 1:
The patent replaces complex powered sensing components with a simple magnetic field interaction system. The precision of input detection is achieved through the geometric arrangement and movement of magnets rather than through complex electronic sensing components, reducing overall device complexity
Solution Approach 2:
The magnetic encoding system serves multiple functions simultaneously: it tracks position, detects movement direction, and determines input intensity through the magnetic field patterns generated by the moving magnets, eliminating the need for separate sensing components for each function
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
The solution provides improved portability and reduced mechanical load on users by eliminating the need for power, reducing component failures, and enhancing usability through efficient user input detection.
Implementation Method 1
A human interface device using a track ball with a pair of magnets mechanically coupled to encode movement of the track ball in a magnetic field distribution, sensed by an unpowered sensing system
Data Source
AI summary
Methods and systems for providing computer implemented services using user input are disclosed. To obtain the user input, a passive human interface device may be used. The human interface device may include a trackball and a pair of magnets that may produce a magnetic field used to discern the user input. The pair of magnets may be mechanically coupled to the trackball and actuatable portions of the human interface device thereby facilitating both rotation and translation, respectively, of the pair of magnets responsive to actuations by a user. The rotation and translation of the pair of magnets may be sensed and used to identify user input provided by the user.