Bokeh Filter Membrane Gradient Refraction for Lens Aberrations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Miniature optical lens assemblies in mobile devices with large aperture stops provide brighter and clearer photography but suffer from shallow depth of field, leading to secondary linear aberrations and excessive light spots, which reduce imaging quality and make it difficult to highlight the subject effectively.
Innovation Solution
A bokeh filter membrane with a gradient thickness absorbing membrane and an anti-reflection membrane, featuring high-and-low refraction membranes and a gradient refraction membrane with metal oxide as the main material, is applied to the optical lens assembly. This membrane has a higher transmittance at the center than the peripheral region, with a specific distribution of membrane thickness and refractive index to absorb visible light and reduce reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large aperture stop is used in the optical lens assembly, then the photography becomes brighter and clearer, but the depth of field becomes shallower, resulting in more serious defocusing and secondary linear aberrations
Solution Approach 1:
The patent applies local quality by implementing different transmittance characteristics in different regions of the optical lens assembly. The first optical lens element has a center region with first transmittance and a peripheral region with second transmittance, while the second optical lens element has corresponding regional transmittance differences. This allows the center region to maintain high brightness while the peripheral region controls defocusing effects, resolving the contradiction between brightness and depth of field control.
2Object-affected harmful factors
If the optical lens assembly uses conventional anti-reflection coating, then some light reflection is reduced, but the reflection elimination effect is insufficient in certain areas
Solution Approach 1:
The patent implements local quality by applying different anti-reflection treatments to different regions of the optical lens assembly. The center region and peripheral region have different transmittance characteristics, allowing optimized reflection control for each region's specific requirements, thereby improving overall reflection elimination effectiveness.
Solution Approach 2:
The patent uses composite materials by combining multiple optical lens elements with different transmittance characteristics and anti-reflection properties. The first and second optical lens elements work together as a composite system, where each element contributes different optical properties to achieve superior reflection elimination compared to conventional single-element designs.
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 bokeh filter membrane enhances imaging quality by creating soft edges for defocused scenery, increasing contrast between the subject and background, and reducing stray light, thereby improving the optical imaging quality by minimizing reflections and maintaining optimal pore structure and refractive index continuity.
Implementation Method 1
The gradient refraction membrane includes a plurality of pores, and the pores away from the substrate are relatively larger than the pores close to the substrate. A main material of the gradient refraction membrane is metal oxide.
Implementation Method 2
The gradient thickness absorbing membrane includes a first gradient thickness absorbing membrane and a second gradient thickness absorbing membrane
Implementation Method 3
The anti-reflection membrane includes a high-and-low refraction membrane and a gradient refraction membrane
Data Source
AI summary
A bokeh filter membrane, which is disposed on a surface of a substrate, includes a gradient thickness absorbing membrane and an anti-reflection membrane. The anti-reflection membrane includes a high-and-low refraction membrane and a gradient refraction membrane. A transmittance of the substrate at a center thereof is greater than a transmittance of the substrate at a peripheral region thereof. The high-and-low refraction membrane includes a first high-and-low refraction membrane and a second high-and-low refraction membrane, the gradient thickness absorbing membrane is farther away from the substrate than the first high-and-low refraction membrane, the second high-and-low refraction membrane is farther away from the substrate than the gradient thickness absorbing membrane, and the gradient refraction membrane is farther away from the substrate than the second high-and-low refraction membrane. The gradient refraction membrane includes a plurality of pores. A main material of the gradient refraction membrane is metal oxide.