Multi-element Image Lens Aberration Correction

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Solution Overview

Problem

Existing image lenses fail to achieve high resolution and small distance requirements, resulting in poor imaging effects due to limitations in aberration correction and optical design.

Innovation Solution

The image lens design includes a specific arrangement of lenses with positive and negative refractive powers, an IR-cut filter, and an aperture stop, satisfying specific formulas to minimize aberrations and maintain a compact length, while using aspherical surfaces to correct chromatic and spherical aberrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing image lens designs are used, then the lens structure is simple, but the resolution is insufficient and imaging effect is poor

Engineering Contradiction:

ImproveresolutionVSAvoidlens structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The image lens is divided into multiple lens elements (first lens element, second lens element, third lens element, fourth lens element) with different optical functions. Each element contributes to correcting specific aberrations and achieving high resolution, transforming a simple single-element design into a segmented multi-element system that delivers superior imaging performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs aspherical surfaces on multiple lens elements to correct spherical aberration and improve resolution. The aspherical design allows for better control of light rays across the aperture, achieving high measurement precision while managing the complexity through optimized surface geometry rather than adding more elements.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Measurement precision

If lens elements are added to improve resolution, then imaging quality improves, but lens length increases

Engineering Contradiction:

Improveimaging qualityVSAvoidlens length

Core Design Contradiction:

Measurement precisionVSLength of stationary object

Solution Approach 1:

The patent arranges lens elements in a compact configuration where the second lens element is positioned between the first and third lens elements along the optical axis. The aperture stop is nested between the first and second lens elements. This nested arrangement allows multiple functional elements to be packed into a shorter overall length while maintaining the resolution and imaging quality benefits of a multi-element design.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent optimizes the radial and axial positioning of lens elements to achieve compact length. By carefully controlling the distances between elements and their radial positions, the design achieves high imaging quality without proportionally increasing the axial length, effectively utilizing dimensional optimization to resolve the contradiction.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Measurement precision

If lens elements are added to correct aberrations, then resolution improves, but manufacturing complexity increases

Engineering Contradiction:

Improveaberration correctionVSAvoidmanufacturing complexity

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent uses aspherical surfaces on specific lens elements to correct spherical aberration and improve imaging quality. While aspherical surfaces increase manufacturing complexity compared to spherical surfaces, the patent applies them selectively rather than on all elements, balancing aberration correction needs with manufacturing feasibility. The aspherical design enables better aberration control for high-resolution imaging.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent optimizes various optical parameters including refractive indices, curvature radii, and thicknesses of lens elements to achieve effective aberration correction. By carefully selecting and adjusting these parameters within practical ranges, the design achieves high measurement precision while keeping manufacturing complexity manageable through parameter optimization rather than requiring exotic materials or complex structures.

Inventive Principle:

Principle #35Parameter changes

4Measurement precision

If focal length is increased for better resolution, then imaging quality improves, but working distance increases

Engineering Contradiction:

ImproveresolutionVSAvoidworking distance

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The patent divides the optical system into multiple lens elements with different focal contributions. The first lens element has positive refractive power for convergence, while the second lens element has negative refractive power for divergence. This segmentation allows the system to achieve high resolution equivalent to a longer focal length while maintaining a shorter overall working distance through the combined effect of multiple elements with opposing optical powers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a zoom mechanism that allows dynamic adjustment of the focal length and working distance. By making the optical system adjustable rather than fixed, the lens can achieve high resolution at different working distances as needed, resolving the contradiction between resolution and working distance through dynamic adaptability.

Inventive Principle:

Principle #15Dynamics

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 solution effectively reduces spherical and field curvature aberrations, maintains a small image lens length, and improves image quality by ensuring uniform light transmission and proper distribution of refractive power, resulting in high-resolution images across various zoom states.