Automatic Darkening Filter Shutter Intermediate State Transition
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Solution Overview
Problem
Automatic darkening filters often cause user discomfort due to abrupt transitions between dark and light states, especially in applications involving intermittent high intensity light exposure.
Innovation Solution
An automatic darkening filter apparatus with a switchable shutter capable of assuming a dark state, a light state, and an intermediate state, controlled by a system that detects changes in light intensity and maintains the shutter in an intermediate state for a predetermined period during transitions from dark to light, minimizing abrupt changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shutter switches rapidly between dark and light states to protect eyesight during intermittent high intensity light exposure, then protection effectiveness is improved, but user comfort deteriorates due to perceived abrupt transitions
Solution Approach 1:
The transition from dark to light state is segmented into multiple intermediate states rather than a single abrupt change. The shutter passes through at least one intermediate optical density state between the dark state and light state, dividing the transition into steps that are less perceptible to the user while maintaining rapid response for protection.
Solution Approach 2:
The shutter transition dynamics are made adaptive based on operational context. The system dynamically adjusts whether to use intermediate states during welding operations versus non-welding operations, optimizing both protection effectiveness and user comfort based on real-time conditions detected by the control system.
2Reliability
If the shutter switches fully between dark and light states during each interruption, then protection is maintained, but user discomfort increases due to repeated full changes in opacity
Solution Approach 1:
The full transition between dark and light states is segmented into intermediate states. During welding interruptions, the shutter transitions through intermediate optical density states rather than switching fully between extremes, reducing the perceptibility of transitions while maintaining adequate protection.
Solution Approach 2:
The optical density parameter of the shutter is changed in gradual steps rather than abrupt jumps. The system modifies the shutter's optical properties through intermediate states, creating a smoother transition that reduces user discomfort while maintaining protection effectiveness.
3Reliability
If the shutter remains in dark state longer during transitions, then protection is enhanced, but response time to restore visibility deteriorates
Solution Approach 1:
The control system applies preliminary action by detecting welding interruptions in advance and proactively transitioning the shutter to intermediate states before full transition to light state would occur. This preliminary transition maintains protection while preparing for the upcoming change in light conditions.
Solution Approach 2:
The shutter response is made dynamic and context-aware. The system adjusts transition timing and intermediate state duration based on detected welding patterns and interruption characteristics, optimizing both protection duration and visibility restoration speed for different operational scenarios.
Data Source
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AI summary
Herein is disclosed an automatic darkening filter apparatus comprising a shutter control system configured to cause a shutter to switch from a dark state to an intermediate state in response to a change from high intensity incident light to low intensity incident light being detected. The control system is further configured to maintain the shutter in the intermediate state for a period of time, unless during this period of time high intensity light is detected, in which case the control system causes the shutter to switch to the dark state. If, at the end of the period of time, high intensity light is not detected, the shutter is caused to switch from the intermediate state to a light state.