Optical Imaging Lens With Cemented Achromatic Assemblies
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Solution Overview
Problem
Conventional optical imaging lenses face challenges in achieving high image quality with minimal distortion and a compact design, often requiring multiple lenses and materials like fluorite, which are costly, difficult to process, and not suitable for harsh environments.
Innovation Solution
A lens assembly comprising a first negative power lens, two cemented achromatic lens assemblies, and a sixth aspherical lens with a positive power, made from plastic or glass materials to reduce manufacturing costs and weight, while maintaining high image quality and temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorite lenses are used to reduce chromatic aberration and improve image quality, then image quality is improved, but manufacturing cost increases, processing difficulty increases, and environmental pollution occurs
Solution Approach 1:
The patent replaces expensive fluorite lenses with conventional glass lenses that can be manufactured more easily and at lower cost. The invention uses a combination of glass lenses with specific refractive indices and Abbe numbers to achieve the required optical performance without the need for difficult-to-process fluorite materials.
Solution Approach 2:
The patent employs a composite lens system consisting of multiple glass lenses with different optical properties (different refractive indices and Abbe numbers). This composite structure allows the system to achieve chromatic aberration correction and high image quality that would otherwise require expensive fluorite materials.
2Measurement precision
If fluorite lenses are used to reduce chromatic aberration, then image quality is improved, but the lens becomes fragile and unsuitable for harsh environments
Solution Approach 1:
The patent replaces fragile fluorite lenses with more robust conventional glass lenses. The glass lenses used in the invention are less fragile and more suitable for harsh environments while still achieving the required optical performance through careful selection of lens parameters and combinations.
3Measurement precision
If multiple lenses are used to eliminate aberrations and improve image quality, then image quality is improved, but the optical length increases and miniaturization becomes difficult
Solution Approach 1:
The patent combines multiple optical functions into a compact lens assembly. By carefully designing the lens configuration and using lenses with specific optical properties, the invention achieves effective aberration correction and high image quality within a shortened optical length, enabling miniaturization of the optical imaging system.
Solution Approach 2:
The patent optimizes various parameters of the lens system including refractive indices, Abbe numbers, focal lengths, and spacing between lenses. By carefully adjusting these parameters, the invention achieves a balance between image quality and compact size, reducing the optical length while maintaining high imaging performance.
4Ease of manufacture
If conventional glass lenses are used instead of fluorite, then manufacturing cost and processing ease are improved, but chromatic aberration correction becomes more difficult
Solution Approach 1:
The patent uses a composite lens system with multiple glass lenses having different refractive indices and Abbe numbers. This composite structure enables effective chromatic aberration correction using conventional glass materials that are easier to manufacture than fluorite, while achieving the required optical performance.
Solution Approach 2:
The patent assigns different optical properties to different lenses within the assembly. Each lens is carefully selected or designed with specific refractive index and Abbe number characteristics that complement the other lenses, creating a system that collectively achieves superior chromatic aberration correction despite using conventional glass materials throughout.
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 lens assembly achieves miniaturization, high image quality, and reduced manufacturing complexity, with improved temperature stability and cost-effectiveness, making it suitable for various applications including vehicular and mobile electronic devices.
Implementation Method 1
two cemented-type achromatic lens assemblies, each of which includes a positive lens and a negative lens that are cemented to each other
Implementation Method 2
a sixth lens (L6) that has a positive power... the sixth lens (L6) is an aspherical lens
Data Source
AI summary
A lens assembly for an optical imaging lens is disclosed, which includes a first lens, wherein the first lens has a negative power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the sixth lens has a positive power, wherein the second lens and the third lens define a first cemented achromatic lens assembly, and the fourth lens and the fifth lens define a second cemented achromatic lens assembly, wherein the first lens, the first cemented achromatic lens assembly, the second cemented achromatic lens assembly and the sixth lens are orderly arranged along the direction from the object side to the image side.