Five-Lens Optical Imaging System for Compact Chromatic Aberration Control

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Solution Overview

Problem

There is a need for optical imaging lens assemblies with high imaging quality to meet the increasing demands of camera devices, particularly in terms of compactness, reduced chromatic aberration, and improved manufacturability, while maintaining high imaging performance.

Innovation Solution

The optical imaging lens assembly consists of five lenses with specific refractive powers and surface types, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, where the surface types and focal lengths are carefully configured to reduce deflection angles, correct chromatic aberration, and enhance manufacturability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the optical imaging lens assembly uses more lenses to improve imaging quality, then the imaging performance is improved, but the device complexity and length increase

Engineering Contradiction:

Improveimaging qualityVSAvoidlens assembly complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by carefully selecting and optimizing the refractive powers, curvature radii, and thicknesses of each lens element. The specific parameter relationships (such as focal length ratios and curvature relationships) enable high imaging quality with a manageable number of lens elements, resolving the contradiction between imaging quality and device complexity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The optical system is segmented into five distinct lens elements with specific functions. Each lens element contributes to correcting specific aberrations, allowing the system to achieve high imaging quality through functional segmentation rather than using a single complex lens or more elements.

Inventive Principle:

Principle #1Segmentation

2Length of moving object

If the optical imaging lens assembly is made more compact by reducing TTL, then the portability is improved, but the manufacturing precision and aberration correction become more difficult

Engineering Contradiction:

ImproveTTL (total track length)VSAvoidchromatic aberration correction

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The patent uses parameter changes by establishing specific relationships between lens parameters (such as focal length ratios, curvature relationships, and thickness ratios) that enable effective chromatic aberration correction within a compact TTL. The negative refractive power lenses are strategically positioned and dimensioned to correct chromatic aberrations despite the reduced overall length.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The optical system employs composite lens design with different refractive power lenses (positive and negative) made from materials with different dispersion properties. This composite approach allows chromatic aberration correction in a compact configuration by combining the optical effects of multiple materials with complementary characteristics.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If the lens surface curvatures are increased to reduce deflection angles, then the ease of manufacture is improved, but the imaging quality and aberration control deteriorate

Engineering Contradiction:

Improvelens manufacturing easeVSAvoidimaging quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies parameter changes by optimizing the curvature radii of each lens surface within specific ranges. The curvature radii are carefully selected to balance manufacturability (avoiding excessively sharp curves) with imaging quality (maintaining proper light bending). The parameter relationships ensure that no single surface requires extreme curvature while achieving the desired optical performance.

Inventive Principle:

Principle #35Parameter changes

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 compact, high-quality imaging lens assembly with reduced chromatic aberration and improved manufacturability, achieving good imaging performance and stability, as demonstrated by the provided examples with various parameters and aberration curves.