Imaging Lens Aberration Correction Low Profile Design

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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 includes a meniscus-shaped first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with aspheric surfaces, and a sixth lens with negative refractive power, specifically designed to correct spherical aberration, astigmatism, field curvature, and chromatic aberration, while maintaining a low profile and securing back focus.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of stationary object

If the first lens is formed in a meniscus shape with strengthened refractive power, then the profile is reduced, but spherical aberration and distortion may worsen without proper surface configuration

Engineering Contradiction:

ImproveprofileVSAvoidspherical aberration and distortion correction

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The first lens employs different surface curvatures on its object-side and image-side surfaces, with the object-side surface having a specific curvature radius relationship to the image-side surface. This local differentiation of surface properties allows the lens to simultaneously achieve profile reduction through strengthened refractive power while maintaining proper aberration correction through asymmetric surface design.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If the second lens has an image-side convex surface, then astigmatism, field curvature and distortion are properly corrected, but the profile may increase

Engineering Contradiction:

Improveastigmatism, field curvature and distortion correctionVSAvoidprofile

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The second lens utilizes specific curvature radius parameters for its image-side convex surface, where the curvature radius is carefully controlled within certain ranges relative to the focal length. By optimizing these geometric parameters, the lens achieves effective correction of astigmatism, field curvature and distortion while minimizing the impact on overall profile through precise mathematical relationships between surface curvatures and lens spacing.

Inventive Principle:

Principle #35Parameter changes

3Length of stationary object

If the sixth lens has an image-side concave surface, then back focus is secured while maintaining low profile, but chromatic aberration, astigmatism, field curvature and distortion correction becomes more difficult

Engineering Contradiction:

Improveback focus and profileVSAvoidchromatic aberration, astigmatism, field curvature and distortion correction

Core Design Contradiction:

Length of stationary objectVSManufacturing precision

Solution Approach 1:

The sixth lens with image-side concave surface is designed to perform multiple aberration correction functions simultaneously. By carefully selecting the curvature radius of the concave surface and positioning the lens within the optical system, it contributes to correcting chromatic aberration, astigmatism, field curvature and distortion all at once, while also securing back focus and maintaining low profile through its negative meniscus shape configuration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Device complexity

If conventional lens configurations are used, then the structure is simpler, but aberration correction in peripheral area is insufficient when low profile and low F-number are required

Engineering Contradiction:

Improvelens configurationVSAvoidperipheral aberration correction

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into six distinct lens elements, each with specifically assigned functions for aberration correction. This segmentation allows different portions of the optical system to address different types of aberrations, with the first lens handling spherical aberration and profile, the second lens correcting astigmatism and field curvature, the third lens addressing chromatic aberration, and subsequent lenses refining distortion and peripheral performance, achieving comprehensive correction that simpler configurations cannot provide.

Inventive Principle:

Principle #1Segmentation

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 excellent aberration correction, balancing low profile and low F-number requirements, thereby enhancing the optical performance of imaging devices.

Implementation Method 1

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

Methodology Applied