Gradient Refractive Index Lens Ion Exchange Manufacturing
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Solution Overview
Problem
Current methods for manufacturing gradient optical property optical elements (GOPOEs) are more expensive than traditional homogeneous optical elements, and they are limited in size and control over gradient distribution, making them costly and restrictive in application.
Innovation Solution
A method involving ion diffusion into a substrate with a diffusion regulating material (DRM) to create spatially controlled gradient optical properties, allowing for the production of larger GOPOEs with precise ion distribution and reduced manufacturing costs through techniques like ion exchange and high-energy ion implantation, enabling the creation of various lens shapes and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing methods with extra processing steps are used to create gradient optical properties, then gradient optical elements can be manufactured, but the manufacturing cost increases significantly
Solution Approach 1:
The patent changes the manufacturing approach by using ion exchange processes that modify the refractive index through chemical parameter changes rather than physical layering. By controlling ion concentration and diffusion parameters, gradient optical properties are achieved more efficiently and cost-effectively than traditional multi-layer fusion methods
Solution Approach 2:
The patent replaces mechanical/thermal fusion processes with chemical ion exchange processes. Instead of physically fusing layers of glass or plastic with different refractive indices, the invention uses ion diffusion to create gradient properties within a single substrate, simplifying the manufacturing system
2Ease of manufacture
If ion exchange method is used to create gradient properties in planar glass substrate, then manufacturing cost decreases and batch fabrication is enabled, but the lens size is limited to approximately 1 mm diameter
Solution Approach 1:
The patent extends the ion exchange process from two-dimensional surface treatment to three-dimensional bulk modification by controlling ion diffusion depth through parameters such as treatment time, temperature, and ion concentration. This allows gradient properties to be established throughout the entire thickness of larger substrates, enabling lens diameters exceeding 1 mm
3Productivity
If current ion diffusion methods are used, then small micro optical elements can be manufactured with gradient properties, but control over gradient distribution is not easily achieved
Solution Approach 1:
The patent incorporates feedback mechanisms by using patterned mask layers that precisely control where ions can diffuse into the substrate. The mask patterns are designed based on desired gradient profiles, and the ion exchange process is monitored and adjusted to achieve the target refractive index distribution, enabling precise control over gradient spatial distribution
Solution Approach 2:
The patent introduces patterned mask layers as intermediary elements between the ion source and the glass substrate. These masks act as spatial filters that control the diffusion pathways of ions, allowing precise shaping of the gradient distribution pattern while maintaining batch fabrication efficiency
Data Source
AI summary
A method for creating gradient optical properties within a substrate is disclosed herein. More specifically, the present invention teaches a method whereby a material disposed on a substrate is patterned in three dimensions such that the thickness and diffusivity properties of the material can be used to regulate the diffusion of ions into the substrate. An example is given in which ions, injected into a substrate through an ion exchange process, alter the refractive index within the substrate in a pre-selected fashion to form a gradient refractive index lens.