Six-Lens Imaging System Aberration Correction Low Profile

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Solution Overview

Problem

Conventional imaging lenses face difficulties in achieving a balance between low profile and low F-number while effectively correcting aberrations, particularly in the peripheral area, leading to suboptimal optical performance.

Innovation Solution

The imaging lens configuration comprises a specific arrangement of lenses with varying refractive powers and surface shapes, including a first lens with positive refractive power, a second lens with negative refractive power, and a sixth lens with a convex image-side surface, along with conditional expressions to optimize lens parameters, ensuring proper correction of aberrations and reducing the lens profile.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional imaging lens configurations are used, then the lens structure is relatively simple, but it is very difficult to correct aberrations at peripheral area when low profile and low F-number are realized

Engineering Contradiction:

Improveaberration correctionVSAvoidlens configuration complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The imaging lens is divided into six distinct lens elements with specific refractive power combinations (+−−−−+, +−−+−+, or +−−−+−). Each lens element has specific surface shape requirements (convex or concave in paraxial region) to distribute aberration correction functions across multiple components, enabling effective peripheral aberration correction while maintaining low profile and low F-number

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each lens element is designed with specific local surface characteristics (convex or concave in paraxial region) tailored to its position in the optical system. The first lens has convex object-side surface, fourth lens has convex object-side surface, and sixth lens has convex image-side surface, creating localized optical properties that collectively correct peripheral aberrations

Inventive Principle:

Principle #3Local quality

2Length of moving object

If the first lens strengthens refractive power for profile reduction, then the lens profile is reduced, but spherical aberration and distortion must be properly corrected

Engineering Contradiction:

Improvelens profileVSAvoidspherical aberration and distortion correction

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The first lens is designed with asymmetric surface curvature, specifically requiring the object-side surface to be convex in the paraxial region. This asymmetric configuration allows the lens to reduce overall profile while the specific convex surface geometry corrects spherical aberration and distortion through controlled light ray refraction patterns

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent specifies precise parameter ranges for the first lens including refractive power strength and object-side surface convexity in the paraxial region. By optimizing these parameters, the lens achieves profile reduction while maintaining the capability to correct spherical aberration and distortion

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If low F-number is achieved, then light gathering capability is improved, but aberration correction at peripheral area becomes more difficult

Engineering Contradiction:

Improvelight gathering capabilityVSAvoidperipheral aberration correction

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The six-lens configuration distributes the optical correction burden across multiple elements. The combination of positive and negative refractive power lenses creates intermediate image planes and correction zones that maintain peripheral aberration correction even at low F-numbers with enhanced light gathering capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each lens element serves multiple functions: the first lens with convex object-side surface simultaneously reduces profile and corrects spherical aberration; the sixth lens with convex image-side surface controls incident angles while correcting aberrations. This multi-functionality allows low F-number operation with maintained peripheral correction

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 achieves high-resolution imaging with a balanced low profile and low F-number, effectively correcting spherical aberration, chromatic aberration, coma aberration, astigmatism, and distortion, resulting in improved optical performance across the image field.

Implementation Method 1

a first lens with positive refractive power having an object-side surface being convex in a paraxial region

Methodology Applied