Multi-coil rotating magnetic field for contact lens power
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Solution Overview
Problem
Electronic contact lenses face power supply challenges due to varying orientations relative to the magnetic field source, leading to inconsistent power coupling and reduced power availability when the coupling strength is weak.
Innovation Solution
Incorporating multiple conductive coils to produce a rotating magnetic field, with a controller adjusting the currents to maintain optimal power transfer regardless of the contact lens's orientation, and using feedback mechanisms to adjust the magnetic field direction and magnitude based on the contact lens's orientation and power requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetic field source is used, then the system structure is simple, but the power coupling becomes inconsistent when the contact lens orientation varies
Solution Approach 1:
The single magnetic field source is segmented into multiple independent coils (first conductive coil and second conductive coil) with different orientations. Each coil is responsible for providing magnetic field in a specific spatial direction, allowing the system to maintain consistent power coupling regardless of contact lens orientation by selectively activating appropriate coils.
Solution Approach 2:
The system dynamically adjusts which coils are activated and their current levels based on the real-time orientation of the contact lens. The controller monitors orientation and dynamically switches between different coil configurations to maintain optimal magnetic coupling, transforming the static single-source system into a dynamic multi-source system.
2Reliability
If multiple conductive coils are used to produce rotating magnetic field, then the power delivery becomes consistent regardless of orientation, but the device complexity increases
Solution Approach 1:
The system transitions from a single-dimensional magnetic field source to a multi-dimensional configuration with coils oriented in different spatial directions. This dimensional expansion allows the magnetic field to effectively reach the contact lens from multiple angles, ensuring consistent power delivery regardless of the lens's rotational orientation.
Solution Approach 2:
The system incorporates orientation detection and feedback mechanisms that monitor the contact lens orientation in real-time. Based on this feedback, the controller adjusts which coils are activated and their respective current levels, creating a closed-loop control system that maintains optimal power coupling despite orientation changes.
3Ease of operation
If the magnetic field direction is fixed, then the system operation is simple, but the power transfer efficiency decreases when coupling strength is weak
Solution Approach 1:
The magnetic field direction transitions from fixed to dynamically adjustable. The system can rotate and reorient the magnetic field vector by controlling the phase and amplitude of currents in multiple coils, allowing the magnetic field to continuously track and maintain optimal alignment with the contact lens for maximum power transfer efficiency.
Solution Approach 2:
The system changes the parameters of the magnetic field (direction, magnitude, phase) by adjusting the current characteristics in different coils. By varying these parameters based on contact lens orientation, the system maintains optimal coupling conditions and maximizes power transfer efficiency without requiring complex mechanical adjustments.
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 ensures consistent and increased power delivery to the contact lens, independent of its orientation, by rotating the magnetic field and adjusting the current distribution among the coils, thereby maintaining stable operation.
Implementation Method 1
Incorporating multiple conductive coils to produce a rotating magnetic field
Implementation Method 2
a first source conductive coil and a second source conductive coil produce a rotating magnetic field
Data Source
AI summary
An augmented reality system includes an electronic contact lens and a plurality of conductive coils to be worn, for instance, around a neck, around an arm, or on a chest of a user. The conductive coils can inductively couple to the electronic contact lens by producing magnetic fields that the electronic contact lens can convert into power. A direction of the resulting magnetic at the electronic contact lens can rotate over time, enabling the electronic contact lens to periodically form a strong inductive coupling with the plurality of conductive coils despite the orientation of the electronic contact lens. The electronic contact lens can also output a feedback signal representative of the power produced at the electronic contact lens or an orientation signal representative of the orientation of the eye, and the magnetic fields produced by the conductive coils can be altered based on the feedback signal or orientation signal.