Five-Lens Imaging System Aberration Correction

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Solution Overview

Problem

Existing imaging lens systems for miniaturized devices, such as portable phones and cameras, face challenges in achieving both miniaturization and wide-angle capabilities while effectively correcting aberrations like spherical and chromatic aberrations due to improper configuration of refractive powers and lens shapes.

Innovation Solution

An imaging lens system comprising five lenses with specific refractive powers and aspherical configurations, including a glass plate between the fifth lens and the image surface, satisfying certain conditions to optimize focal lengths, curvature radii, and axial distances, which enables miniaturization and wide-angle performance while correcting aberrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the imaging lens system is miniaturized, then the device size is reduced, but the ability to achieve wide-angle capability and correct aberrations deteriorates

Engineering Contradiction:

Improvelens system sizeVSAvoidwide-angle capability

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The imaging lens system is divided into five distinct lens groups with alternating positive and negative refractive powers. This segmentation allows each lens to contribute specifically to different optical functions: the first positive lens provides strong converging power for miniaturization, the negative lenses correct aberrations, and the subsequent positive lenses maintain focal length and image quality, achieving both compact size and wide-angle capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs aspherical surface parameters and specific refractive index values to optimize the optical performance of each lens element. By carefully controlling curvature radii, thicknesses, and refractive powers of individual lenses, the system achieves wide-angle capability (2ω≥78°) and corrects spherical and chromatic aberrations while maintaining a compact form factor with TTL/IH≤1.40

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If the refractive power of the first lens is increased for miniaturization, then the lens system size is reduced, but spherical and chromatic aberrations worsen

Engineering Contradiction:

Improvelens system sizeVSAvoidspherical and chromatic aberrations

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful strong spherical and chromatic aberrations generated by the high-power first positive lens into beneficial correction opportunities by strategically placing negative lenses with specific refractive powers and aspherical surfaces. The negative second lens and negative fifth lens are designed to counterbalance the aberrations from the positive lenses, transforming the initial harmful effect into an opportunity for comprehensive aberration correction

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The imaging lens system uses composite optical design combining lenses with different refractive powers and aspherical surfaces. The alternating arrangement of positive and negative lenses creates a composite optical system where the cumulative effect of multiple elements with different optical properties achieves both miniaturization and superior aberration correction that cannot be obtained with single-material or single-power designs

Inventive Principle:

Principle #40Composite materials

3Volume of moving object

If the focal length is reduced for miniaturization, then the device size is reduced, but the optical performance deteriorates

Engineering Contradiction:

Improvelens system sizeVSAvoidoptical performance

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent employs aspherical surfaces on multiple lens elements, allowing the optical paths to dynamically adapt to different incident angles and wavelengths. The aspherical parameters enable the lens system to maintain high optical performance across the wide field of view while keeping the focal length short, achieving flexibility in light ray control that spherical surfaces cannot provide

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 achieves a wide-angle capability with miniaturization, maintaining TTL/IH ≤ 1.40, 2ω ≥ 78°, and Fno ≤ 2.2, while providing good optical performance by effectively correcting spherical and chromatic aberrations.