Lens Flange Surface Roughness for Flare Reduction
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Solution Overview
Problem
Camera modules in portable electronic devices experience flare or ghost phenomena due to light reflection from the flange portion of lenses, which are not related to image formation and affect captured images.
Innovation Solution
A lens with a flange portion having sequentially disposed regions of varying surface roughness, including a light blocking portion with black dye, is designed to prevent flare by scattering and blocking unintended light reflections, where the first and third surface roughness are greater than the second, and the light blocking portion is positioned to prevent dye overflow into the optical portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking portion is disposed on the flange portion to block reflected light, then flare phenomenon is reduced, but the structure becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
The flange portion is divided into three regions with different surface roughness values (Ra1, Ra2, Ra3) where Ra1 > Ra2 and Ra3 > Ra2. The first and third regions have higher surface roughness to scatter light, while the second region has lower surface roughness to work with the light blocking portion. This local differentiation of surface properties allows effective flare reduction without adding complex structural elements.
Solution Approach 2:
The light blocking portion is formed by injecting black dye into the flange portion during molding. The black color provides high light absorption properties to block reflected light effectively. The dye is confined to specific regions (first and/or third regions) with higher surface roughness, creating a visually distinct light-blocking zone that simplifies the overall structure while maintaining effectiveness.
2Object-affected harmful factors
If black dye is injected into the flange portion to form a light blocking portion, then light reflection is blocked, but the dye may overflow into the optical portion affecting optical performance
Solution Approach 1:
The flange portion is divided into three regions with different surface roughness values to create distinct zones for dye injection. The first and third regions have higher surface roughness (Ra1 and Ra3) that can contain the black dye, while the second region has lower surface roughness (Ra2). This local differentiation creates natural boundaries that prevent dye overflow into the optical portion while ensuring effective light blocking in the desired areas.
Solution Approach 2:
The surface roughness pattern is pre-established in the flange portion structure before dye injection. By having the first and third regions with higher roughness already formed, the dye injection process can proceed with confidence that the dye will be contained within these regions and will not overflow into the optical portion, thus preventing contamination before it occurs.
3Object-affected harmful factors
If the surface roughness is increased in certain regions to scatter light, then light reflection is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of uniformly increasing surface roughness across the entire flange portion, the invention applies higher surface roughness locally to only the first and third regions (Ra1 and Ra3) while maintaining lower roughness in the second region (Ra2). This localized approach reduces light reflection where needed while keeping manufacturing precision requirements manageable by limiting the affected areas to specific zones with defined boundaries.
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 prevents flare phenomena by scattering and blocking unintended light reflections, ensuring improved image quality by controlling the diffusion of black dye and maintaining optical performance.
Implementation Method 1
a first region having first surface roughness, a second region having second surface roughness, and a third region having third surface roughness are sequentially disposed from the optical portion toward the flange portion... the first surface roughness and the third surface roughness are greater than the second surface roughness
Implementation Method 2
a light blocking portion is disposed in the second region
Implementation Method 3
an optical portion configured to refract light
Data Source
AI summary
A lens includes an optical portion configured to refract light, and a flange portion extending from the optical portion, wherein a first region having first surface roughness, a second region having second surface roughness, and a third region having third surface roughness are sequentially disposed from the optical portion toward the flange portion, on at least one of an object-side surface and an image-side surface of the flange portion, the first surface roughness and the third surface roughness are greater than the second surface roughness, and a light blocking portion is disposed in the second region.