PWM Eye Shield Heating System for Even Fog Prevention
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Solution Overview
Problem
Existing eye shield heating systems for fog prevention suffer from inefficiencies such as uneven heating, excessive power consumption, and limited battery life due to irregular shapes and inadequate power management, which also restrict the integration of corrective lenses.
Innovation Solution
A pulse-width modulator (PWM) and metal-oxide-semiconductor field-effect transistor (MOSFET) based system that dynamically adjusts power delivery to multiple regions of the eye shield, using dew point calculation and relative humidity sensors to maintain optimal heating, ensuring even heating and conserving battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power source is carried on the goggle or head band to provide heating, then fog prevention capability is improved, but power source life is reduced due to excessive power consumption
Solution Approach 1:
The system dynamically adjusts the heating power delivered to different regions of the eye shield based on real-time temperature sensor feedback. The control circuit varies the power level to match actual heating needs, preventing both fogging and excessive power consumption that would deplete the battery prematurely.
Solution Approach 2:
The patent changes the heating parameter (power level) based on temperature conditions. Temperature sensors detect the current state of the eye shield and surrounding environment, and the control circuit adjusts the heating power parameter accordingly - providing more heat when fogging risk is high and less heat when the shield is already warm, thereby optimizing battery life.
2Reliability
If heating is applied to the entire eye shield surface, then fog prevention is improved, but power consumption increases excessively
Solution Approach 1:
The eye shield heating system divides the shield into multiple regions with different heating zones. Temperature sensors are positioned at specific locations (temple area, bridge of nose, cheek areas) to detect local conditions. The control circuit applies heating selectively to regions that need it based on local temperature readings, rather than uniformly heating the entire shield surface, thus reducing overall power consumption while maintaining effective fog prevention.
3Ease of operation
If the eye shield is positioned close to the face for portability, then ease of wear is improved, but fogging is exacerbated due to body heat and breath
Solution Approach 1:
The heating system takes preliminary anti-action by applying heat before fogging occurs. Temperature sensors continuously monitor conditions and predict when fogging might occur based on temperature drops and humidity levels. The control circuit activates heating in advance to prevent condensation formation, countering the fogging tendency caused by close positioning before it actually happens.
Solution Approach 2:
The system uses temperature sensors positioned at multiple locations on the eye shield to provide continuous feedback about the thermal state of different regions. This feedback loop allows the control circuit to adjust heating power in real-time, compensating for the fogging-prone environment created by close face positioning and body heat/moisture accumulation.
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 system effectively prevents fogging while maximizing battery life by providing tailored power distribution to different regions of the eye shield, ensuring even heating and reducing power consumption.
Implementation Method 1
a heating element on the eye shield
Implementation Method 2
A pulse-width modulator (PWM) and metal-oxide-semiconductor field-effect transistor (MOSFET) based system that dynamically adjusts power delivery
Data Source
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AI summary
Eye- shield condensation preventing system comprising an eye shield adapted for protecting a user's eyes and adapted for defining at least a partially enclosed space between the user's eyes and the eye shield, a power source, a pulse-width modulator preferably comprised of a microcomputer, switching means, preferably comprised of a MOSFET device, that is responsive to the pulse-width modulator, a preferably indium-tin-oxide (ITO) heating element on the eye shield, and a circuit interconnecting the power source, the pulse-width modulator, the switching means and the heating element for controlling heating of the eye shield. In one embodiment the eye shield is divided into a plurality of heating regions. A current adjustment means, sensors, and optionally user-selectable profiles are employed to allow heating adjustment or automated anti-fog capability and variable condition adaptability of the invention.