Slim Lens Assembly Aberration Correction and Miniaturization
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Solution Overview
Problem
Slim lens assemblies face challenges in miniaturization, high resolution, and environmental temperature resistance, failing to meet the requirements of modern applications.
Innovation Solution
A slim lens assembly comprising a sequence of lenses with specific refractive powers and surface curvatures, including a first biconvex lens, a second and third meniscus lens with positive refractive power, and a fourth meniscus lens, along with an aperture stop, designed to satisfy conditions that ensure a shortened total lens length, high resolution, and resistance to environmental temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens assembly is miniaturized to reduce total lens length, then the size is reduced, but the resolution and optical performance deteriorate
Solution Approach 1:
The lens assembly is divided into four distinct lens elements with specific refractive powers and surface curvatures. Each lens element (first biconvex, second meniscus, third meniscus, fourth meniscus) is optimized independently to contribute to overall resolution while maintaining compact total length through careful segmentation of optical functions.
Solution Approach 2:
The patent applies specific parameter relationships to achieve miniaturization without sacrificing resolution. Key parameters include the composite focal length ratio (f234/f4 between 0.2-0.5), curvature radius ratios (R11/f1 between -2.0 to -0.5), and focal length ratios ((f1+f3)/(f2+f4) between 0.5-2.0). These parameter optimizations enable compact design while maintaining high resolution.
2Ease of manufacture
If the lens assembly structure is simplified for easier manufacture, then manufacturing ease improves, but the ability to resist environmental temperature changes deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges that simultaneously achieve manufacturability and temperature resistance. The curvature radius ratios (R11/f1, R12/f1), focal length relationships (f234/f4, (f1+f3)/(f2+f4)), and surface shape configurations are optimized to create a structure that is both manufacturable and environmentally stable across temperature variations.
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 design achieves a shortened total lens length, effectively corrects aberrations, increases resolution, and maintains good optical performance while resisting environmental temperature changes, as demonstrated by the optical specifications and performance diagrams.
Implementation Method 1
The first lens is with positive refractive power, which includes a convex surface facing an image side
Implementation Method 2
The second lens is with positive refractive power, which includes a concave surface facing the image side
Implementation Method 3
The third lens is with positive refractive power, which includes a concave surface facing the object side and a convex surface facing the image side
Implementation Method 4
The fourth lens is with positive refractive power
Data Source
AI summary
A slim lens assembly in accordance with the invention in order from an object side to an image side along an optical axis, comprises a first lens, a second lens, a third lens and a fourth lens. The first lens is with positive refractive power, which includes a convex surface facing an image side. The second lens is with positive refractive power, which includes a concave surface facing the image side. The third lens is with positive refractive power, which includes a concave surface facing the object side and a convex surface facing the image side. The fourth lens is with positive refractive power.