Optical Path Folding Element with Light Absorption Film
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Solution Overview
Problem
Conventional optical lenses with optical path folding configurations struggle to prevent non-imaging reflected light, leading to poor optical quality, which fails to meet the high imaging quality requirements of advanced electronic devices.
Innovation Solution
An optical path folding element with a main body, a light absorption film layer, and a matte structure is used, where the light absorption film layer reduces reflectance by incorporating a metal layer and metal oxide layer, and the matte structure provides an undulating profile to disrupt stray light, while the light absorption film layer is in physical contact with the main body and adjacent to the optical surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an optical path folding configuration is used to reduce device size, then the compactness is improved, but non-imaging reflected light is generated leading to poor optical quality
Solution Approach 1:
The patent converts the harmful non-imaging reflected light into beneficial light absorption by applying light absorption films (black chromium, black nickel, or black diamond-like carbon) on the optical path folding element surfaces. This transforms the harmful reflection into useful light absorption, eliminating the negative effect while maintaining the compact folded optical path design.
Solution Approach 2:
The patent applies different surface treatments to different regions of the optical path folding element. The light absorption films are selectively applied to specific surfaces where non-imaging reflection occurs, while other surfaces maintain their original optical properties. This localized treatment addresses the harmful reflection problem without affecting the overall optical performance.
2Ease of manufacture
If conventional configurations are used to simplify manufacturing, then the ease of manufacture is improved, but optical quality deteriorates due to non-imaging reflected light
Solution Approach 1:
The patent uses composite material structures by combining the optical path folding element (made of glass or plastic) with light absorption films (black chromium, black nickel, or black diamond-like carbon). This composite approach maintains manufacturing simplicity while adding the light absorption functionality to eliminate non-imaging reflected light.
Solution Approach 2:
The light absorption films used in the patent are relatively simple to apply and can be manufactured using cost-effective processes such as sputtering, chemical vapor deposition, or atomic layer deposition. These films provide an economical solution to the optical quality problem without requiring complex manufacturing changes.
3Object-affected harmful factors
If light absorption film layer is added to reduce reflectance, then optical quality is improved, but device complexity increases
Solution Approach 1:
The light absorption film layer is divided into multiple discrete layers with different materials and thicknesses. This segmentation allows optimization of light absorption at different wavelengths and angles, improving optical quality while maintaining a manageable structural complexity through systematic layer design.
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 stray light and improves optical quality by minimizing reflectance and enhancing image quality, meeting the high-end specifications of electronic devices.
Implementation Method 1
The light absorption film layer is configured to reduce reflectance. The light absorption film layer includes a metal layer, and a primary element of the metal layer is chromium (Cr).
Implementation Method 2
The reflective surface is configured to reflect the light so as to change a traveling direction thereof.
Data Source
AI summary
An optical path folding element includes a main body, a light absorption film layer and a matte structure. The main body has optical surface including an incident surface, a reflective surface and an emitting surface. A light enters into the optical folding element through the incident surface. The reflective surface reflects the light so as to change a traveling direction thereof. The light exits the optical folding element through the emitting surface. The light absorbing film layer is configured to reduce reflectance and provided adjacent to at least part of the optical surface, and the light absorbing film layer is in physical contact with the main body. The matte structure is disposed adjacent to at least part of the optical surface. The matte structure provides an undulating profile on a surface of the optical path folding element, and the matte structure is formed in one-piece with the main body.