Optical System Index Matching Scattering Surface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical systems, such as cameras, experience image degradation due to reflected light traveling a different path than transmitted light, resulting in halos, ghost images, or glare, caused by interfaces between materials with different optical properties.
Innovation Solution
An optical system comprising a first optical element with a scattering surface finish and a second optical element separated by a gap filled with an index matching material that contacts both elements, minimizing scattering and optimizing light transmission by matching the refractive indices, allowing more light to propagate through while scattering excess light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a scattering surface finish is applied to the first boundary to scatter reflected light, then image degradation from ghost images is reduced, but light transmission through the boundary is also reduced
Solution Approach 1:
The first boundary is divided into two distinct regions: a first portion with a scattering surface finish that scatters reflected light to reduce ghost images, and a second portion with a polished surface that transmits light efficiently. This local differentiation allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
The boundary surface is segmented into functionally distinct zones - the scattering portion handles reflected light while the polished portion handles transmitted light. This segmentation resolves the contradiction by separating the conflicting requirements of scattering and transmission into different spatial locations on the same boundary.
2Adaptability or versatility
If multiple optical elements with different materials are used to achieve desired optical properties, then optical performance is improved, but interfaces between materials cause light reflection and image degradation
Solution Approach 1:
An index matching material is introduced as an intermediary substance at the interface between the first and second optical elements. This material has a refractive index that matches both adjacent materials, serving as a mediator that eliminates abrupt refractive index changes and prevents light reflection at the interface, thereby maintaining optical performance while reducing harmful reflections.
Solution Approach 2:
The refractive index parameter is carefully selected and matched across the interface by using an index matching material. By changing and matching this optical parameter, the system maintains the benefits of using different optical materials while eliminating the harmful effect of light reflection at material boundaries.
3Manufacturing precision
If optical elements are precisely aligned and polished to minimize reflections, then image quality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The scattering surface finish on the first boundary automatically directs reflected light away from the optical path without requiring active control or adjustment mechanisms. The surface geometry itself provides the corrective function, eliminating the need for complex alignment procedures or active compensation systems.
Solution Approach 2:
The problematic reflected light is extracted and redirected by the scattering surface finish before it can cause image degradation. By taking the reflected light out of the problematic path and redirecting it elsewhere, the system achieves good image quality without requiring high-precision alignment or polishing of all surfaces.
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 arrangement reduces image degradation by minimizing the scattering effect of the surface finish, allowing a greater fraction of light to transmit through while reducing reflections that can corrupt the image detected by image sensors, thus enhancing image quality without the need for precise alignment or polishing of optical elements.
Implementation Method 1
The index matching region comprises a second light transmitting material that has a fluidic state when dispensed and a matching index of refraction after being dispensed
Implementation Method 2
The first boundary has a surface finish effective to scatter light impinging on the first boundary
Data Source
AI summary
An optical system and method for controlling light propagation along a light path. An optical element such as a lens is formed of a first light transmitting material and has a surface finish effective to scatter light impinging on the surface. Index matching material contacts to a portion of the surface so as to reduce or nullify the scattering effects of the surface finish within the portion. This allows the first optical element to have surfaces that have been generally prepared for scattering light and then later selectively negate the scattering effects of the surface finish by contacting portions of the surface with index matching material. As such, light in the optical element directed toward a surface or boundary within selected portion propagates into or out of the optical element. Light outside of the selected portion is scattered. Such an arrangement helps to reduce image degradation due to light outside of the light path being reflected about within the optical system.