Five-Lens Imaging Lens Layout for Low Distortion in Compact Optics

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Solution Overview

Problem

Existing optical imaging lenses face challenges in achieving high image quality while considering small size and cost constraints, particularly in applications like portable electronic devices, drones, and automotive systems where temperature variations affect performance.

Innovation Solution

An optical imaging lens design comprising at least five lenses, including specific refractive powers and surface configurations, with aspheric and spherical surfaces, and incorporating an infrared filter and protective glass to enhance image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the number of lenses is increased to improve image quality, then imaging quality and distortion control improve, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improveimaging qualityVSAvoidlens assembly complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The lens assembly is divided into two groups: a first lens assembly containing lenses with negative refractive power, and a second lens assembly containing lenses with positive refractive power. This segmentation allows independent optimization of each group's function while achieving overall low distortion and high image quality through coordinated design.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent specifies precise refractive power parameters and surface curvature parameters for each lens element. By carefully controlling these optical parameters and their relationships (such as the ratio of refractive powers between different lens groups), the design achieves optimal image quality and low distortion without requiring excessive lens elements.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the number of lenses is increased to reduce distortion, then optical performance improves, but lens size and manufacturing cost increase

Engineering Contradiction:

Improvedistortion controlVSAvoidlens assembly size

Core Design Contradiction:

Manufacturing precisionVSVolume of moving object

Solution Approach 1:

By dividing the lens assembly into functional groups (negative power group and positive power group), the patent achieves effective distortion control through the complementary optical effects of each group, rather than simply adding more lenses in sequence. This segmented approach reduces the overall optical path length and assembly size.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs asymmetric surface designs including concave object-side surfaces and convex image-side surfaces with specific curvature relationships. This asymmetric configuration allows for compact lens spacing and reduced overall assembly volume while maintaining excellent distortion correction performance.

Inventive Principle:

Principle #4Asymmetry

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 lens design achieves low distortion and high image quality, effectively reducing chromatic aberrations and maintaining optical performance across varying temperatures.

Implementation Method 1

The first lens has negative refractive power. An object-side surface of the first lens is a concave surface. An image-side surface of the first lens is a convex surface.

Methodology Applied