5-Lens Imaging System Aberration Correction via Refractive Index Control

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Solution Overview

Problem

Current imaging lenses for miniaturized camera modules face challenges in achieving high-resolution and compact designs while maintaining satisfactory optical and aberration characteristics.

Innovation Solution

A 5-lens configuration with specific refractive powers and shapes, including positive and negative lenses with aspherical surfaces, and conditional expressions for refractive indices and Abbe's numbers, is used to optimize the imaging lens's performance and miniaturization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a 5-lens configuration is used to achieve high-resolution imaging, then the imaging quality is improved, but the device size and complexity increase

Engineering Contradiction:

Improveimaging resolutionVSAvoidlens configuration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by precisely controlling refractive indices (N1=1.533, N2=1.644, N3=1.536, N4=1.636, N5=1.531), Abbe numbers (V1=56.5, V2=23, V3=56.5, V4=56.5, V5=56.5), and focal lengths (f1=4.08mm, f2=-4.07mm, f3=-8.51mm, f4=2.32mm, f5=-2.28mm) of each lens element to optimize the 5-lens configuration for high-resolution imaging while managing system complexity through parameter optimization

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs aspherical surfaces on multiple lens elements (first lens object side surface, second lens object side surface, third lens both surfaces, fourth lens image side surface, fifth lens both surfaces) to correct aberrations and improve imaging resolution, utilizing curved surface geometry to enhance optical performance

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If lens elements are added to correct aberrations, then optical performance is improved, but the lens length increases

Engineering Contradiction:

Improveaberration correctionVSAvoidlens length

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent uses parameter changes by selecting specific refractive indices and Abbe numbers for each lens element that inherently provide aberration correction capabilities, allowing effective correction with a compact 5-element configuration rather than requiring additional elements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material principles by combining lens elements with different refractive indices and Abbe numbers (high dispersion N2=1.644 with V2=23, medium dispersion N1/N3/N4/N5 with V=56.5) to achieve aberration correction through material property complementarity rather than simply adding more elements

Inventive Principle:

Principle #40Composite materials

3Measurement precision

If aspherical surfaces are used to correct aberrations, then imaging quality is improved, but manufacturing difficulty increases

Engineering Contradiction:

Improveimaging qualityVSAvoidaspherical surface fabrication

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent specifies aspherical surfaces on key lens elements (first lens object side, second lens object side, third lens both surfaces, fourth lens image side, fifth lens both surfaces) to correct aberrations, accepting the manufacturing complexity as necessary to achieve the desired high-resolution imaging performance

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 configuration results in a high-performance, high-resolution, and compact imaging lens with improved aberration correction, specifically addressing the challenges of coma, spherical, and astigmatic aberrations.