Six-Lens Imaging System for Low Profile and Aberration Correction

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Solution Overview

Problem

Conventional imaging lenses face challenges in achieving high resolution with a low profile and low F-number while effectively correcting aberrations, particularly in the peripheral area.

Innovation Solution

The imaging lens configuration includes a specific arrangement of lenses with varying refractive powers and surface shapes, such as convex and concave surfaces, along with conditional expressions to optimize lens parameters, ensuring proper correction of spherical aberration, chromatic aberration, coma aberration, astigmatism, and distortion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the first lens strengthens refractive power to reduce profile, then the profile is reduced, but spherical aberration and distortion correction becomes difficult

Engineering Contradiction:

ImproveprofileVSAvoidaberration correction

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into six separate lens elements with different refractive powers and surface configurations. The first lens has positive refractive power with convex surfaces to reduce profile, while subsequent lenses (second through sixth) with varying negative and positive powers correct the aberrations introduced by the first lens. This segmentation allows each element to perform its specialized function without compromising overall performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs precise control of optical parameters including refractive indices (Nd1=1.5445, Nd2=1.6711, etc.), Abbe numbers (vd1=5.93, vd2=9.24, etc.), and surface curvatures (r1, r2, r3, etc.) to balance profile reduction with aberration correction. By optimizing these parameters across multiple lens elements, the system achieves both compact form factor and high optical quality.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If the imaging lens achieves low F-number for high light gathering, then light gathering ability improves, but aberration correction particularly in peripheral area becomes difficult

Engineering Contradiction:

Improvelight gathering abilityVSAvoidaberration correction

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The six-lens configuration distributes the optical function across multiple elements, allowing each to contribute to both light transmission and aberration control. The combination of positive and negative power lenses creates a balanced system that maintains low F-number while correcting field curvature and distortion that typically plague wide-aperture designs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different lens elements are designed with specific local characteristics: the first lens with convex surfaces addresses central ray convergence, the second and third lenses with negative power correct chromatic and spherical aberrations, the fourth lens refines astigmatism correction, and the fifth and sixth lenses optimize peripheral field performance. This localized optimization enables excellent correction across the entire field at low F-number.

Inventive Principle:

Principle #3Local quality

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 aberrations and reducing lens diameter, thereby enhancing optical performance.

Implementation Method 1

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

Methodology Applied