Auto Darkening Filter Shade Transition Control
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Solution Overview
Problem
Conventional auto darkening filters (ADF) cause user discomfort and eye fatigue due to instantaneous and large shade transitions from dark to light states during welding, leading to visual dazzling and misinterpretation of light changes.
Innovation Solution
The method involves controlling the light valve to transition from a target shade to a first shade within a defined time period, allowing for intermediate shades and using high-voltage signals to manage shade changes, ensuring a smoother and delayed transition, thereby improving user comfort and visual adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the light valve transitions instantaneously from target shade to light state shade when welding arc signal disappears, then the response speed is fast and productivity is high, but the user experiences visual discomfort and eye fatigue
Solution Approach 1:
The patent applies preliminary action by initiating a gradual transition process before the light valve fully returns to the light state. When the welding arc signal disappears, the control circuit doesn't immediately switch to the light state shade, but instead begins a progressive transition through intermediate shades over a predetermined time period. This preliminary gradual adjustment prevents the sudden visual shock that would occur with instantaneous switching, thereby reducing eye fatigue and visual discomfort while still maintaining relatively fast response characteristics.
2Object-affected harmful factors
If the light valve uses intermediate shades during transition, then the user comfort is improved and eye fatigue is reduced, but the transition time is extended
Solution Approach 1:
The patent applies dynamics by making the shade transition a dynamic, time-varying process rather than a static instantaneous change. The control circuit dynamically adjusts the light valve shade through a sequence of intermediate shades over a predetermined time period. This dynamic transition allows the system to balance comfort and time by providing gradual adaptation to the user's eyes while still completing the transition within a reasonable timeframe, preventing both sudden visual shock and excessively long transition durations.
3Object-affected harmful factors
If the light valve transitions smoothly through intermediate shades, then the visual adaptation is improved and misinterpretation of light changes is prevented, but the complexity of the control circuit increases
Solution Approach 1:
The patent applies segmentation by dividing the shade transition process into discrete segments or steps through intermediate shades. Instead of a continuous complex adjustment, the control circuit transitions the light valve through a series of predetermined intermediate shade levels. This segmentation simplifies the control logic while still achieving smooth visual adaptation, as each intermediate shade represents a distinct, manageable step in the transition process, reducing the overall control circuit complexity compared to continuous analog adjustment.
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 approach reduces eye fatigue and visual discomfort by providing a delayed and smoother transition from dark to light states, enhancing user experience and preventing misinterpretation of light changes during welding.
Implementation Method 1
controlling the light valve to transition from the target shade to the first shade within a time period T2
Data Source
AI summary
A method of controlling shade of light valve for auto darkening filter includes: controlling the current shade of the light valve at a first shade, continuously detecting a welding arc signal until it is detected; controlling the first shade of the light valve to change to a target shade, and maintaining the target shade for welding work until the welding arc signal is interrupted; controlling the light valve to transition from the target shade to the first shade within a time period T2, wherein at least one intermediate shade is passed during the transition. For the conventional ADF, after the welding arc signal disappears, the control circuit immediately switches the light valve from the target shade to the light state shade. The switch of the light valve from the target shade to the light state shade occurs instantaneously, therefore the user may feel dazzling, causing damage to vision.