Imaging Lens Light Blocking Sheet with Nanostructure Layer
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Solution Overview
Problem
Conventional optical systems face challenges in achieving high image quality due to stray light reflection, which affects the performance of electronic devices equipped with optical systems, particularly in reducing the intensity of non-imaging light reflected in lenses.
Innovation Solution
The imaging lens incorporates a light blocking sheet with tapered light blocking structures and a nanostructure layer, where the nanostructure layer has ridge-like protrusions extending non-directionally from curved surfaces, reducing surface reflectivity and stray light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional optical systems use traditional lens structures, then the device complexity is low, but stray light reflection occurs and image quality deteriorates
Solution Approach 1:
The patent applies local quality by introducing a light blocking sheet with specific structural features (tapered light blocking structures and curved surfaces) at specific locations within the lens system. These localized structures are designed to block stray light paths without affecting the overall lens design, thereby reducing stray light reflection while maintaining reasonable device complexity
Solution Approach 2:
The light blocking sheet acts as an intermediary element between the lens components. It mediates the interaction between light and the lens structures by introducing tapered light blocking structures and curved surfaces that redirect or block stray light, thereby reducing its harmful effects on image quality without requiring complete redesign of the entire optical system
2Object-affected harmful factors
If the light blocking sheet uses simple flat structures, then the manufacturing precision requirement is low, but stray light reflection is not effectively reduced
Solution Approach 1:
The patent employs spheroidality by designing the light blocking sheet with curved surfaces instead of flat surfaces. The curved surfaces are specifically shaped to redirect stray light away from the image plane, effectively reducing surface reflectivity. While this increases manufacturing precision requirements, the curvature design follows specific geometric principles that can be achieved through standard manufacturing processes
3Reliability
If conventional light blocking structures are used, then the device complexity is low, but image quality deteriorates due to non-imaging light
Solution Approach 1:
The light blocking sheet is segmented into multiple functional regions: tapered light blocking structures for blocking oblique stray light, curved surfaces for redirecting reflected light, and potentially different material zones. This segmentation allows each portion to address specific stray light paths, improving image quality through targeted intervention rather than requiring a complete complex optical redesign
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
This configuration effectively minimizes stray light reflection, enhancing image quality by reducing surface reflectivity and maintaining low reflectivity across various wavelengths, thus meeting the requirements of high-end specification electronic devices.
Implementation Method 1
The nanostructure layer has a plurality of ridge-like protrusions that extend non-directionally from the curved surfaces
Implementation Method 2
The nanostructure layer is at least disposed on the curved surfaces formed by the first curved part and the second curved part
Data Source
AI summary
An imaging lens includes a light blocking sheet that includes an inner ring surface, a plurality of tapered light blocking structures, and a nanostructure layer. The inner ring surface surrounds an optical axis and defines a light passage opening. The tapered light blocking structures are disposed on the inner ring surface, and each tapered light blocking structure protrudes from the inner ring surface and tapers off towards the optical axis. The tapered light blocking structures are periodically arranged to surround the optical axis. The contour of each tapered light blocking structure has a curved part in a view along the optical axis. The curved part forms a curved surface on the inner ring surface. The nanostructure layer is disposed on the curved surface and has a plurality of ridge-like protrusions that extend non-directionally, and the average structure height of the nanostructure layer ranges from 98 nanometers to 350 nanometers.