Optical Lens Assembly With Blue-Glass NIR Filtering and Flare Control
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Solution Overview
Problem
Current optical lens assemblies using blue glass plates with near-infrared light filtering coatings suffer from petal-shaped flares due to multiple reflections of visible light, leading to reduced imaging quality, and the arrangement of these components is not easily changeable.
Innovation Solution
Incorporate a blue-glass lens element and a long-wavelength absorbing lens element within the optical lens assembly, with specific thickness and coating arrangements to minimize reflections and filter near-infrared light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blue glass plate with near-infrared light filtering coating membrane is arranged in front of the image sensor, then near-infrared light filtering is improved, but visible light reflections cause petal-shaped flares and imaging quality deteriorates
Solution Approach 1:
The patent merges the blue glass plate and the near-infrared light filtering coating membrane into a single integrated optical element. This combination eliminates the interface between separate components that causes multiple reflections, thereby reducing petal-shaped flares while maintaining effective near-infrared light filtering and improving overall imaging quality.
Solution Approach 2:
The patent employs composite material structure by combining blue glass material with a multi-layer near-infrared light filtering coating membrane. This composite approach allows the optical element to simultaneously achieve blue glass's inherent near-infrared absorption properties and the coating membrane's selective wavelength filtering, while the integrated structure minimizes internal reflections.
2Object-affected harmful factors
If a blue glass plate and near-infrared light filtering coating membrane are disposed on the surface, then near-infrared light filtering is achieved, but the arrangement becomes fixed and difficult to change
Solution Approach 1:
By merging the blue glass plate and near-infrared light filtering coating membrane into a single integrated optical element, the patent creates a modular component that can be flexibly positioned within the optical lens assembly. This integration allows designers to adjust the element's location and orientation to optimize performance for different applications without being constrained by fixed multi-component arrangements.
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
Reduces petal-shaped flares and enhances imaging quality by preventing visible light reflections and optimizing near-infrared light filtering across various fields of view.
Implementation Method 1
The at least three optical lens elements include a blue-glass lens element... reduce the interference in the optical imaging caused by the near-infrared light
Implementation Method 2
the at least three optical lens elements include a long-wavelength absorbing lens element... filter out the near-infrared light
Implementation Method 3
the long-wavelength filtering coating membrane includes at least one low refractive index layer and at least one high refractive index layer... filter out the near-infrared light
Data Source
AI summary
An optical lens assembly includes at least three optical lens elements. The at least three optical lens elements include, in order from an object side to an image side of the optical lens assembly, a first optical lens element, a second optical lens element and a third optical lens element. The at least three optical lens elements include a blue-glass lens element, and the at least three optical lens elements include a long-wavelength absorbing lens element.