Composite Optical Element Glass Resin Aberration Correction
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Solution Overview
Problem
Existing image-capturing optical systems face challenges in reducing overall length and weight while maintaining optical performance, particularly in correcting chromatic aberrations and spherical aberrations, especially when using aspheric lenses with high partial dispersion ratios.
Innovation Solution
The optical system employs composite optical elements comprising a glass lens and a resin lens with specific refractive index, Abbe number, and partial dispersion ratio ranges to optimize the correction of chromatic aberrations and spherical aberrations, ensuring a compact and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resin lens with high partial dispersion ratio is used to correct chromatic aberration, then chromatic aberration correction is improved, but chromatic spherical aberration and chromatic field curvature increase
Solution Approach 1:
The patent combines glass and resin materials in a composite optical element. The glass lens provides stable optical properties with lower dispersion, while the resin layer with high partial dispersion ratio corrects chromatic aberration. This composite structure allows the system to achieve excellent chromatic aberration correction without the excessive chromatic spherical aberration and field curvature that would result from using high partial dispersion ratio resin alone.
2Weight of stationary object
If the refractive power of each lens is increased to reduce overall length and weight, then compactness and lightweight are improved, but aberrations increase
Solution Approach 1:
The patent divides the optical element into multiple segments: a glass lens and a resin layer, each with specific refractive powers. By segmenting the optical function between these materials, the system can achieve the necessary total refractive power for compactness while distributing aberration correction responsibilities - the glass provides stable refraction and the resin corrects chromatic aberrations, maintaining optical performance despite increased refractive power.
Solution Approach 2:
The composite structure of glass and resin allows the optical system to achieve high refractive power in a compact form while correcting aberrations. The glass component provides stable optical properties and the resin component corrects chromatic aberrations, enabling the system to be both compact and maintain excellent aberration correction performance.
3Reliability
If an aspheric lens is used to correct aberrations, then aberration correction is improved, but manufacturing complexity increases
Solution Approach 1:
The patent forms the aspheric surface on the resin layer of the composite optical element. This approach allows the aspheric shape to be created using molding techniques for the resin, which is generally easier and more cost-effective than grinding and polishing aspheric glass surfaces. The glass lens maintains a simpler spherical shape, while the resin layer provides the aspheric correction, dividing the manufacturing complexity.
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 configuration results in a small, lightweight, high-performance optical system with improved chromatic aberration correction and reduced spherical aberrations, maintaining optical performance across varying temperatures and humidity levels.
Implementation Method 1
The resin lens has an aspheric shape. When Nd is a refractive index of the resin lens, νd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens
Data Source
AI summary
A composite optical element includes a glass lens and a resin lens that are joined together. The resin lens has an aspheric shape. When Nd is a refractive index of the resin lens, νd is an Abbe number of the resin lens, and θgF is a partial dispersion ratio of the resin lens, Nd, νd, and θgF are appropriately set.