Switchable Electrochromic Coating for Night Vision Light Leakage
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Solution Overview
Problem
Current night vision systems face challenges such as light leakage, which can compromise covert operations, and mechanical covers used to prevent this are cumbersome and noisy, posing risks to auditory security.
Innovation Solution
A night vision system with a switchable electro-chromic coating on the eyepiece that can be toggled between transparent and opaque modes, allowing video images to be viewed while preventing light from exiting, thereby addressing light leakage issues without the drawbacks of mechanical covers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If mechanical covers are used to prevent light leakage, then light leakage is blocked, but the device becomes cumbersome and noisy
Solution Approach 1:
The patent replaces the mechanical cover system with an electrochromic coating system. Instead of using moving mechanical parts to block light, the invention uses an electrically controllable coating that changes its optical properties (from transparent to opaque) when voltage is applied, thereby eliminating mechanical complexity and noise while maintaining light blocking capability
Solution Approach 2:
The electrochromic coating changes its optical parameter (transparency) in response to electrical voltage. When voltage is applied, the coating transitions from a transparent state to an opaque state, dynamically controlling light transmission without mechanical movement. This parameter change resolves the contradiction by providing light blocking functionality through electrical control rather than mechanical means
2Object-affected harmful factors
If mechanical covers are used to prevent light leakage, then light leakage is blocked, but auditory security is compromised due to noise
Solution Approach 1:
The patent substitutes the noisy mechanical cover system with a silent electrochromic coating system. The coating changes opacity through electrical voltage without any mechanical movement, thereby completely eliminating the noise generated by mechanical covers while maintaining effective light leakage prevention, thus resolving the contradiction between light blocking and noise generation
3Object-affected harmful factors
If a switchable coating is added to the eyepiece, then light leakage is prevented, but device complexity increases
Solution Approach 1:
The electrochromic coating serves multiple functions simultaneously: it acts as both a protective coating on the eyepiece and a light-blocking mechanism. By integrating these functions into a single component rather than adding separate mechanical covers, the patent minimizes the increase in device complexity while achieving effective light leakage prevention
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 light leakage, enhancing covert operations by allowing users to view video and optical images simultaneously while maintaining auditory security and reducing the risk of noise and mechanical failure.
Implementation Method 1
A layer of switchable coating on the eyepiece can be switched between a transparent mode and an opaque mode
Implementation Method 2
A splitting surface within the optical device reflects some of a video image toward an eye of a user of the eyepiece
Data Source
AI summary
A night vision system includes an eyepiece and a video camera to capture a video image that can be remote to the eyepiece. The eyepiece includes an optical device with a front side and a back side. A splitting surface within the optical device reflects some of a video image toward an eye of a user of the eyepiece, and the splitting surface further allows some light of an optical image received from in front of the eyepiece to past through the eyepiece to the eye of the user. The layer of switchable coating on the eyepiece can be switched between a transparent mode and an opaque mode by the user. When in an opaque mode no light can leave the front side of the optical device and only the video image can be seen through the eyepiece.