Light Blocking Sheet Microstructures for Ghost Image Reduction
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Solution Overview
Problem
Conventional optical systems struggle to maintain high image quality due to non-imaging light reflection, which affects the performance of high-end-specification electronic devices.
Innovation Solution
The imaging lens incorporates a light blocking sheet with microstructures and nanostructure layers on its surfaces to scatter and reduce non-imaging light reflection, utilizing protrusions with specific height ranges and angles to enhance anti-reflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems are used, then the structure is simple, but non-imaging light reflection reduces image quality
Solution Approach 1:
The patent applies porous materials by forming microholes on the surfaces of optical components (lens barrel, light blocking sheet, lens element). These microholes create a porous structure that scatters non-imaging light and reduces reflection intensity, thereby improving image quality without requiring complex additional components
Solution Approach 2:
The patent changes physical parameters by controlling the depth, diameter, and distribution of microholes on different surfaces. By adjusting these parameters (depth ranging from 1-10 micrometers, diameter from 0.5-2 micrometers), the reflection reduction effect is optimized while maintaining structural simplicity
Solution Approach 3:
The patent applies local quality by creating microholes only on specific surfaces where non-imaging light reflection occurs (object-side and image-side surfaces). This localized treatment reduces reflection precisely where needed without complicating the entire optical system structure
2Manufacturing precision
If microstructures and nanostructure layers are added to reduce reflection, then image quality improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated structure. The light blocking sheet simultaneously serves as a light blocking component and a reflection reduction component by forming microholes directly on its surfaces. This eliminates the need for separate anti-reflection coatings or additional layers, simplifying the manufacturing process
Solution Approach 2:
The patent replaces complex multi-layer anti-reflection coating systems with a mechanical microhole structure. Instead of applying multiple thin films with different refractive indices, the microhole structure physically scatters light, achieving reflection reduction through geometric design rather than material layering
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 solution effectively reduces non-imaging light reflection, improving image quality and preventing ghost images by combining microstructures and nanostructures with controlled angles and dimensions.
Implementation Method 1
The first microstructure has a plurality of protrusions, and an average height of the first microstructure ranges from 0.25 micrometers to 19 micrometers
Implementation Method 2
Each of the first nanostructure layer and the second nanostructure layer has a plurality of ridge-like protrusions that extend non-directionally
Data Source
AI summary
An imaging lens includes a lens element, a light blocking sheet, and a lens barrel accommodating the lens element and the light blocking sheet. The light blocking sheet includes a first object-side surface, a first image-side surface, a first inner ring surface, a first microstructure, and a first nanostructure layer. The first image-side surface is opposite to the first object-side surface. The first inner ring surface is located between the first object-side surface and the first image-side surface and defines a first light passage opening. The first microstructure is disposed on the first object-side surface or the first image-side surface. The first microstructure has a plurality of protrusions. The first nanostructure layer is disposed on the first inner ring surface. The first nanostructure layer has a plurality of ridge-like protrusions extending non-directionally.