Light-Shielding Film Extinction Coefficient for Lens Reflection
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Solution Overview
Problem
Existing light-shielding films for optical elements face challenges in reducing inner-surface reflection while maintaining a thin thickness, as increasing absorption to reduce reflection often leads to increased thickness, which hinders lens miniaturization and performance improvements.
Innovation Solution
A light-shielding film with an average extinction coefficient of 0.03 to 0.15 for wavelengths between 400 to 700 nm, composed of a resin and a colorant, which absorbs light effectively to minimize reflection at interfaces with both the lens and air, while maintaining a thin thickness to fit within narrow lens barrel clearances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the light-shielding film thickness is increased to reduce inner-surface reflection, then the reflection reduction effect is improved, but the lens cannot be incorporated into a narrow lens barrel clearance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the film thickness within 1-10 μm and the extinction coefficient within 0.03-0.15 to optimize the balance between reflection reduction and thickness minimization, enabling the film to fit in narrow clearances while maintaining effectiveness
Solution Approach 2:
The patent uses composite materials by combining a resin base material with specific colorants (carbon black, titanium black, iron oxide) to achieve the desired extinction coefficient and optical properties while maintaining thin film thickness
2Object-affected harmful factors
If the light-shielding film thickness is increased to absorb transmitted light, then the second reflected light is reduced, but the stress increases causing lens deformation
Solution Approach 1:
The patent applies parameter changes by optimizing the film thickness to 1-10 μm and controlling the extinction coefficient to 0.03-0.15, achieving sufficient light absorption while minimizing stress-induced deformation
Solution Approach 2:
The patent applies local quality by using a thin film structure that provides sufficient absorption only where needed (at the interface) without the excessive thickness that would cause stress and deformation throughout the entire lens structure
3Object-affected harmful factors
If the light-shielding film thickness is increased to reduce inner-surface reflection, then the reflection is inhibited, but the lens size cannot be reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the film thickness within 1-10 μm to achieve reflection reduction while maintaining compact lens dimensions, enabling both goals to be met simultaneously
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 inner-surface reflection, preventing flare and ghost effects in optical elements, allowing for smaller lens designs and improved performance without increasing film thickness, thus enabling better image quality and easier incorporation into compact optical devices.
Implementation Method 1
A light-shielding film with an average extinction coefficient of 0.03 to 0.15 for wavelengths between 400 to 700 nm, composed of a resin and a colorant, which absorbs light effectively to minimize reflection at interfaces with both the lens and air
Data Source
AI summary
A light-shielding film for optical element includes at least a resin and a colorant. The light-shielding film for optical element has an average extinction coefficient of 0.03 or more and 0.15 or less as an average of extinction coefficients of the whole light-shielding film for light having wavelengths ranging from 400 to 700 nm.