Adaptive Transmittance Optical Device for Helmet Visors
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Solution Overview
Problem
Conventional optical devices, such as those using liquid crystals, fail to effectively manage light transmittance from different directions, leading to inconsistent performance in varying light conditions.
Innovation Solution
An optical device with a transmittance changing unit and a voltage control unit that adjusts voltage to switch between distinct relationships of frontal and peripheral transmittance, using a liquid crystal member and polarizing plates to modulate light entry based on applied voltages and detected light amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical device uses a single transmittance control mechanism, then the structure is simple, but it cannot effectively manage light transmittance from different directions
Solution Approach 1:
The patent divides the optical device into multiple independent control regions: a frontal transmittance control unit for light from the front and a peripheral transmittance control unit for light from oblique directions. Each unit has its own transmittance control mechanism, allowing independent adjustment of transmittance for different light directions. This segmentation enables the device to handle complex lighting conditions that a single control mechanism cannot manage.
Solution Approach 2:
The patent applies different transmittance control characteristics to different regions of the optical device. The frontal region uses one transmittance control mechanism optimized for front-facing light, while the peripheral region uses another mechanism optimized for oblique light. This local differentiation of control quality allows each region to perform its specific function optimally, resolving the contradiction between versatility and complexity.
2Adaptability or versatility
If the optical device controls frontal and peripheral transmittance independently, then adaptability to different light conditions improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple transmittance control units into a single integrated optical device structure. The frontal transmittance control unit and peripheral transmittance control unit are merged within the same device housing, sharing common components such as the liquid crystal layer, polarizing plates, and control circuitry. This merging approach enables adaptive light management for different directions while avoiding the complexity of completely separate devices.
Solution Approach 2:
The patent designs the optical device with multi-functional capabilities: a single device structure performs both frontal transmittance control and peripheral transmittance control simultaneously. The liquid crystal layer and polarizing plates serve dual purposes in both control units, allowing the device to manage various light conditions (frontal glare, peripheral glare, bright light) with one integrated system rather than requiring multiple specialized devices.
3Reliability
If conventional optical devices use uniform transmittance control, then manufacturing is simple, but performance consistency in varying light conditions deteriorates
Solution Approach 1:
The patent segments the optical device into modular control units (frontal and peripheral) that can be manufactured and tested independently before final assembly. Each unit has standardized interfaces and mounting structures, which simplifies the assembly process despite the increased functional complexity. The segmentation allows for specialized manufacturing of each control unit while maintaining overall performance consistency through controlled integration.
4Extent of automation
If the optical device dynamically switches transmittance relationships, then responsiveness to changing light conditions improves, but control system complexity increases
Solution Approach 1:
The patent implements dynamic transmittance control by periodically switching voltage application to the liquid crystal layer based on detected light conditions. The control unit monitors ambient light and automatically adjusts the transmittance state (high or low) in response to changing conditions such as approaching bright light or glare. This automated periodic action enables responsive adaptation to varying light environments while using standard control circuitry.
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
Enables adaptive light management across different directions, reducing glare and flicker by dynamically controlling transmittance in response to changing light conditions, enhancing user experience and visual comfort.
Implementation Method 1
a transmittance changing unit (16) that is provided in front of an eye of a user and changes transmittance for light from the outside according to a voltage being applied
Implementation Method 2
using a liquid crystal member and polarizing plates to modulate light entry based on applied voltages
Data Source
AI summary
Conventional optical devices cannot cope with light entering from different directions in different light amounts. An optical device comprises: a transmittance changing unit that is provided in front of an eye of a user, and changes transmittance for light from the outside according to a voltage being applied; and a voltage control unit that controls a voltage to be applied to the transmittance changing unit, wherein by controlling the voltage, the voltage control unit switches between: a first relationship between frontal transmittance that is transmittance for light entering the transmittance changing unit from a frontal direction, and peripheral transmittance that is transmittance for light entering the transmittance changing unit from a direction inclined to the vertical direction relative to an entrance direction of light to which the frontal transmittance applies; and a second relationship between the frontal transmittance and the peripheral transmittance that is different from the first relationship.