Lightweight Night Vision Systems Using Diffractive Optics
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Solution Overview
Problem
Current night vision systems are heavy and bulky due to outdated optics, which cause physical strain and limit agility and extended use, as they consist of dense and complex lens objectives and eyepieces that have not significantly changed since their inception, contributing to nearly 40% of the system's weight and size.
Innovation Solution
Replacement of traditional objective and eyepiece lenses with broadband multi-level diffractive lenses (MDLs) to reduce weight and size, allowing for adjustable focal lengths to optimize balance and attachment options, such as head-worn or handheld configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional complex lens objectives and eyepieces are used, then optical performance is maintained, but weight and size increase significantly
Solution Approach 1:
The patent changes the fundamental optical parameters by replacing refractive lenses with diffractive optical elements. The diffractive objective lens and eyepiece use diffraction-based focusing rather than refraction, enabling thinner, lighter construction while maintaining optical performance across a broad spectrum range.
Solution Approach 2:
The patent employs composite optical systems combining diffractive optical elements with traditional imaging components. The diffractive objective lens integrates multiple functional layers including a diffractive surface, field flattening elements, and spectral management coatings to achieve both weight reduction and performance maintenance.
2Reliability
If traditional complex lens objectives and eyepieces are used, then optical performance is maintained, but device complexity increases
Solution Approach 1:
The patent merges multiple optical functions into single diffractive elements. The diffractive objective lens combines focusing, field flattening, and spectral management in one component, while the diffractive eyepiece integrates focusing and eye relief adjustment, significantly reducing the number of separate optical elements required.
Solution Approach 2:
The diffractive optical elements serve multiple functions simultaneously: they focus light across broad spectra, flatten the field, manage chromatic aberrations, and provide eye relief adjustment. This multi-functionality reduces the need for separate specialized components, simplifying the overall system architecture.
3Reliability
If objective lens is placed at the point furthest from the eye, then optical performance is optimized, but physical strain on wearer increases
Solution Approach 1:
The diffractive objective lens is constructed as a thin, lightweight optical element that can be positioned closer to the eye without compromising performance. The thin-film diffractive structure reduces the moment arm and associated physical strain while maintaining the necessary optical path length through diffraction-based focusing.
4Reliability
If traditional optics are used, then optical performance is maintained, but weight distribution becomes unbalanced
Solution Approach 1:
The patent segments the optical system into two lightweight diffractive components: a thin diffractive objective lens and a diffractive eyepiece. This segmentation distributes the optical functionality throughout the system rather than concentrating weight in a single heavy objective lens, improving balance and weight distribution.
Solution Approach 2:
The diffractive eyepiece incorporates adjustable focus mechanisms that allow dynamic repositioning of the focal point. This enables the system to maintain optimal optical performance while adjusting the center of gravity and balance point to reduce wearer strain and improve comfort during extended use.
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 use of MDLs results in a system that is approximately 35% lighter, reducing physical strain and enhancing user agility, enabling extended use and improved balance, while maintaining equivalent optical performance.
Implementation Method 1
Broadband multi-level diffractive lenses (MDLs) are used in place of either or both of the objective (OBJ) and eyepiece (EYP) of traditional NV systems
Data Source
AI summary
Systems and methods for improving night vision systems are presented. Broadband multi-level diffractive lenses are used in place of either or both of the objective and eyepiece of traditional night vision systems. By using one or more broadband multi-level diffractive lenses, the size, weight, and weight distribution may be reduced or modified.